ISO 4014 Bumax 88 Thread d M6 M8 M10 M12 M14 M16 M18 M20 M24 M27 M30 M36 Pitch of thread 1 1.25 1.5 1.75 2 2 2.5 2.5 3 3 3.5 4 s 10 13 16 18 21 24 27 30 36 41 46 55 k 4 5.3 6.4 7.5 8.8 10 11.5 12.5 15 17 18.7 22.5 e (min). 11.05 14.38 17.77 20.03 23.35 26.75 30.14 33.53 39.98 45.2 50.85 60.79 Lenght of thread engagement b for 1 to 125 18 22 26 30 34 38 42 46 54 60 66 Lenght of thread engagement b over 125 24 28 32 36 40 44 48 52 60 66 72 84 Screw length Approximate weight per 100 l kg kg kg kg kg kg kg kg kg kg kg kg 30 0.83 35 0.92 1.8 40 1.0 2.0 3.4 45 1.2 2.2 3.8 5.4 50 1.3 2.4 4.00 5.8 10 55 1.4 2.6 4.4 6.3 11 60 1.5 2.8 4.7 6.7 12 65 1.6 3.0 5.00 7.1 13 70 1.7 3.2 5.3 7.5 14 23 75 3.4 5.5 7.9 15 24 37 64 80 1.9 3.6 5.9 8.4 12 16 25 39 69 85 6.2 90 2.01 3.9 6.6 9.2 13 17 22 28 43 71 100 2.3 4.3 7.2 10 14 19 24 30 46 60 77 117 110 2.5 4.7 7.5 11 20 33 50 65 82 120 2.7 4.8 8.3 12 16 22 28 35 54 70 88 132 130 2.9 5.3 9.6 13 23 38 56 72 92 140 5.8 10 14 19 25 32 40 60 77 98 147 150 6.2 11 15 26 34 42 63 81 103 160 12 16 28 45 67 86 109 163 180 13 17 31 49 74 95 120 200 14 34 54 81 103 131 195 Nut type BUMAX 88-M6M 0.22 0.48 1.1 1.5 2.3 2.9 4.9 5.7 11 16 22 40 Sample order: ISO 4014 Bumax 88 M6x30 Packaging Diameter M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M24 M27 M30 M36 No. per pack 200 100 100 50 50 25 25 25 10 10 10 10 10 10
ISO 4014 Bumax 109 Thread d M6 M8 M10 M12 M16 Pitch of thread 1 1.25 1.5 1.75 2 s 10 13 16 18 24 k 4 5.3 6.4 7.5 10 e (min). 11.05 14.38 17.77 20.03 26.75 Length of thread engagement b for 1 to 125 18 22 26 30 38 Length of thread engagement b over 125 Screw length Approximate weight per 100 l kg kg kg kg kg 35 0.92 40 1.0 2.0 45 1.2 2.2 3.8 5.4 50 1.3 2.4 4.0 5.8 55 1.4 2.6 4.4 6.3 60 1.5 2.8 4.7 6.7 65 5.0 70 1.7 3.2 5.3 7.5 14 80 1.9 3.6 5.9 8.4 16 90 6.6 9.2 17 100 7.2 10 19 120 12 22 Nut type BUMAX 109 0.22 0.48 1.1 1.5 2.9 Sample order: ISO 4014 Bumax 109 M6x35 Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 M16 No. per pack 100 50 50 25 25
ISO 4017 Bumax 88 Thread d M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M24 M27 M30 M36 Pitch of thread 0.7 0.8 1 1.25 1.5 1.75 2 2 2.5 2.5 3 3 3.5 4 s 7 8 10 13 16 18 21 24 27 30 36 41 46 55 k 2.8 3.5 4 5.3 6.4 7.5 8.8 10 11.5 12.5 15 17 18.7 22.5 e (min). 7.66 8.79 11.05 14.38 17.77 20.03 23.36 26.75 30.14 33.53 39.98 45.2 50.85 60.79 Screw length Approximate weight per 100 l kg kg kg kg kg kg kg kg kg kg kg kg kg kg 6 0.14 8 0.15 10 0.16 0.27 0.41 0.91 12 0.18 0.29 0.44 0.98 1.7 14 0.32 0.48 1.0 16 0.21 0.35 0.51 1.1 1.09 20 0.24 0.39 0.58 1.2 2.1 3.1 22 0.62 1.3 25 0.28 0.46 0.67 1.4 2.4 3.4 7.0 30 0.31 0.55 0.75 1.6 2.6 3.8 5.8 7.7 35 0.63 0.84 1.7 2.09 4.1 8.3 15 40 0.65 0.92 1.09 3.1 4.5 6.8 9.0 12 16 24 45 0.70 1.0 2.0 3.4 4.09 9.7 17 26 50 0.76 1.1 2.2 3.6 5.2 7.8 10 14 18 27 38 55 19 60 1.3 2.5 4.1 5.8 8.8 12 15 20 30 42 54 65 21 32 70 1.4 2.8 4.6 6.7 9.8 13 17 22 33 45 59 75 23 35 80 1.6 3.1 5.1 7.4 14 19 24 36 49 64 99 90 5.7 8.1 39 53 69 106 100 6.1 8.8 28 42 57 73 114 110 6.6 120 7.1 20 48 65 127 130 7.6 69 134 140 73 141 150 38 77 148 160 81 Nut type BUMAX 88-M6 0.7 0.11 0.22 0.48 1.1 1.5 2.3 2.9 4.9 5.7 11 16 22 40 Sample order: Bumax 88-M6S-H M4x6 Packaging Diameter M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 M24 M27 M30 M36 No. per pack 200 100 100 50 50 25 25 25 10 10 10 10 10 10
ISO 4017 Bumax 109 Thread d M6 M8 M10 M12 M16 M20 Pitch of thread 1 1.25 1.5 1.75 2 X 2 10 13 16 18 24 X k 4 5.3 6.4 7.5 10 X e (min). 11.5 14.38 17.77 20.3 26.75 X Screw length Approximate weight per 100 l kg kg kg kg kg kg 20 0.6 1.2 2.1 25 0.7 30 0.8 1.6 2.6 3.8 7.7 X 35 40 3.1 4.5 9.0 X 45 9.7 X 50 10 X 55 11 X 60 12 X Nut type BUMAX 109-M6M 22 48 1.1 1.5 2.9 X Sampel order: Bumax 109M6S-H M6x20 Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 M16 M20 No. per pack 100 50 50 25 25 10
ANSI B 18.2.1 Bumax 88 Thread d UNC 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 No. of threads per inch - 20 18 16 13 11 10 9 8 s inch - 7/16 1/2 9/16 3/4 15/16 1.1/8 1.5/16 1.1/2 s mm - 11.1 12.7 14.3 19 23.8 28.6 33.3 38.1 k - 4 5.2 6 7.9 9.9 11.9 13.9 15.5 e (min) - 12.39 14.15 15.95 21.34 26.69 31.85 37.21 42.55 Length of thread engagement b for 1 to 152-19 22 25 32 38 44 51 57 Over 152-51 Bolt length l Approximate weight per 100 inch mm kg kg kg kg kg kg kg kg 1/2 13 0.56 0.95 5/8 16 0.62 1.1 1.5 3/4 19 0.66 1.1 1.6 7/8 22 1.7 1 25 0.79 1.3 1.9 3.8 6.8 1.1/4 32 0.97 1.5 2.2 4.4 7.7 12 1.1/2 38 1.1 1.8 2.5 4.8 8.5 13 20 1.3/4 45 1.3 2.0 2.9 5.6 9.4 15 2 51 1.4 2.3 3.3 6.2 10 16 24 33 2.1/4 57 3.6 6.7 11 17 35 2.1/2 64 1.7 2.8 3.9 7.5 12 19 27 37 2.3/4 70 4.3 8.1 13 20 29 3 76 2.0 3.2 4.7 8.7 14 21 31 42 3.1/4 83 5.0 9.2 15 23 33 3.1/2 89 3.7 5.3 10 16 24 35 47 4 102 4.3 6.1 11 18 27 39 52 4.1/2 102 6.7 12 20 30 42 57 5 114 7.4 14 23 33 46 61 5.1/2 140 8.2 15 24 36 50 67 6 152 8.7 16 26 38 54 71 6.1/2 165 41 7 178 44 Nut type BUMAX 88-U6M 0.32 0.47 0.69 1.6 3.2 5.3 9.2 14 Sample order: Above stepped line 931U BUMAX 88. The rest: 933U Bumax88 1/4x19 Screws above the stepped line are fully-threaded.
ISO 4762 Bumax 88 Thread d M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 Pitch of thread 0.5 0.7 0.8 1 1.25 1.5 1.75 2 2.5 3 dk 5.5 7 8.5 10 13 16 18 24 30 36 k 3 4 5 6 8 10 12 16 20 24 s 2.5 3 4 5 6 8 10 14 17 19 Length of thread engagement b 18 20 22 24 28 32 36 44 52 60 Screw length Approximate weight per 100 l kg kg kg kg kg kg kg kg kg kg 6 0.071 0.15 8 0.080 0.17 10 0.088 0.18 0.27 12 0.096 0.20 0.30 0.51 14 0.52 16 0.12 0.23 0.35 0.58 1.2 2.1 20 0.14 0.27 0.40 0.65 1.3 2.3 3.2 22 25 0.16 0.32 0.48 0.76 1.5 2.5 3.6 30 0.19 0.37 0.56 0.83 1.7 2.8 3.9 7.8 13 35 0.42 0.63 0.99 1.9 3.0 4.3 8.4 40 0.47 0.71 1.1 2.1 3.3 4.7 9.1 15 45 0.79 1.1 2.2 3.6 5.0 9.8 16 50 0.56 0.86 2.5 3.9 5.5 11 17 30 55 4.2 12 60 1.00 1.5 2.9 4.6 6.3 12 19 32 65 4.8 70 1.2 1.9 3.3 5.2 7.1 14 22 36 75 5.4 80 2.1 3.7 5.9 8.0 15 24 40 90 2.2 6.5 8.9 17 27 43 100 7.1 9.8 19 29 47 110 20 120 8.4 12 22 55 130 140 39 62 150 66 Null type BUMAX 88-M6M 0.03 0.07 0.11 0.22 0.48 1.1 1.5 2.9 5.7 11 Sample order:bumax 88-MC6S M3x6Screws above the stepped line are fully-threaded. Due to space restrictions, M3 and M4 can be supplied without marking and knurling. Packaging Diameter M3 M4 M5 M6 M8 M10 M12 M16 M20 M24 No. per pack 500 200 100 100 50 50 25 25 10 10
ISO 4762 Bumax 109 Thread d M6 M8 M10 M12 Pitch of thread 1 1.25 1.5 1.75 dk 10 13 16 18 k 6 8 10 12 s 5 6 8 10 Length of thread engagement b 24 28 32 36 Screw length Approximate weight per 100 l kg kg kg kg 20 0.65 1.3 2.3 30 0.83 1.7 2.8 3.9 40 1.1 2.1 3.3 4.7 50 1.3 2.5 3.9 5.5 60 1.5 2.9 4.6 6.3 70 1.9 3.3 5.2 7.1 80 2.1 3.7 5.9 8.0 90 4.0 6.5 8.9 100 7.1 9.8 120 12 0.22 0.48 1.1 1.5 Sample order: Screws above the stepped line are fully-threaded. Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 No. per pack 100 50 50 25
ISO 10642 Bumax 88 Thread d M3 M4 M5 M6 M8 M10 M12 M16 Pitch of thread 0.5 0.7 0.8 1 1.25 1.5 0.09375 2 dk max. 6.72 8.96 11.20 13.44 17.92 22.4 26.88 33.6 k max. 1.86 2.48 3.1 3.72 4.96 6.2 7.44 08.8 s 2 2.5 3 4 5 6 8 10 Length of thread engagement b 18 20 22 24 28 32 36 44 Screw length Approximate weight per 100 l kg kg kg kg kg kg kg kg 6 0.4 8 0.5 10 0.6 0.11 0.19 0.26 12 0.7 0.12 0.20 0.32 16 0.8 0.15 0.26 0.36 0.74 20 0.10 0.18 0.31 0.44 0.87 1.4 25 0.22 0.36 0.53 1.0 1.7 30 0.29 0.45 0.64 1.2 1.9 2.9 35 1.3 2.2 40 0.88 1.6 2.4 3.6 6.5 45 4.1 50 0.77 1.1 2.0 3.0 7.8 60 1.3 2.5 5.5 9.2 70 3.0 6.3 11 80 13 90 100 16 Null type 0.3 0.7 0.11 0.22 0.48 1.1 1.5 2.9 Sample order: Screws above the stepped line are fully-threaded. However we reserve the right, at our discretion, to supply all lengths in a fully-threaded design. Packaging Diameter M3 M4 M5 M6 M8 M10 M12 M16 No. per pack 500 200 100 100 50 50 25 25
ANSI B 18.3 Bumax 88 Thread d M3 M4 M5 M6 M8 Pitch of thread 0.5 0.7 0.8 1 1.25 dk 5.6 8 9.5 12 16 k (max.) 2.4 3.1 3.7 4.6 6 Torx no. T10 T20 T25 T30 T45 Screw length Approximate weight per 100 inch mm kg kg kg kg kg kg kg kg 1/2 13 0.50 0.9 5/8 16 0.58 1.0 3/4 19 0.62 1.1 1.07 7/8 22 1.1 1.9 1 25 0.73 1.2 2.0 4.1 1.1/4 32 0.86 1.3 2.1 4.8 8.2 1.1/2 38 1.0 1.6 2.5 5.2 9.0 1.3/4 45 2 51 2.1 3.2 6.2 11 17 26 37 2.1/4 57 12 2.1/2 64 4.0 20 2.3/4 70 3 76 8.2 23 32 46 3.1/4 83 3.1/2 89 4 102 40 56 Null type 0.32 0.47 0.69 1.6 3.2 5.3 9.2 14 Sample order: Screws above the stepped line are fully-threaded, while screws below the line are usuallysupplied partially-threaded with a thread engagement length as above. However we reserve the right, at our discretion, to supply all lengths in a fully-threaded design. Packaging Diameter 1/4 5/16 3/8 1/2 5/8 3/4 7/8 1 No. per pack 100 50 50 25 25 10 10 10
ISO 14583 Bumax Hard Taptite Thread d M3 M4 M5 M6 M8 Pitch of thread 0.5 0.7 0.8 1 1.25 dk 5.6 8 9.5 12 16 k (max.) 2.4 3.1 3.7 4.6 6 Torx no. T10 T20 T25 T30 T45 Screw length Approximate weight per 100 l kg kg kg kg kg 6 0.6 8 0.7 0.15 10 0.8 0.17 0.28 12 0.9 0.18 0.31 0.51 16 0.22 0.35 0.58 1.2 20 0.41 0.65 1.4 25 0.74 1.5 30 0.82 1.7 40 2.0 Sample order: All lengths are supplied in a fully-threaded design. Guide values for hole diameter refer to technical information. For assembly in structural steel type ST37 and stainless steel Packaging Diameter M3 M4 M5 M6 M8 No. per pack 500 200 100 100 50
ISO 14583 Bumax Taptite Thread d M3 M4 M5 M6 M8 Pitch of thread 0.5 0.7 0.8 1 1.25 dk 5.6 8 9.5 12 16 k (max.) 2.4 3.1 3.7 4.6 6 Torx no. T10 T20 T25 T30 T45 Screw length Approximate weight per 100 l kg kg kg kg kg 6 0.6 8 0.7 0.15 10 0.8 0.17 0.28 12 0.9 0.18 0.31 0.51 16 0.22 0.35 0.58 1.2 20 0.41 0.65 1.4 25 0.74 1.5 30 0.82 1.7 40 2.0 Sample order:bumax -MRT-TT Torx M3x6All lengths are supplied in a fully-threaded design. For assembly in material with hardness not exceeding HV 115. Guide values for hole diameter refer to technical information. Packaging Diameter M3 M4 M5 M6 M8 No. per pack 500 200 100 100 50
ISO 7045 Bumax Taptite Thread Thread d M3 M4 M5 M6 Pitch of thread 0.5 0.7 0.8 1 dk 5.6 8 9.5 12 k (max.) 2.4 3.1 3.7 4.6 Driver no. 1 2 2 3 Screw length Approximate weight per 100 l kg kg kg kg 6 0.6 8 0.7 0.15 10 0.8 0.17 0.28 12 0.9 0.18 0.31 0.51 16 0.22 0.35 0.58 20 0.41 0.65 25 0.74 Sample order: Bumax-MRX-TT Z M3x6All lengths are supplied in a fully-threaded design. Guide values for hole diameter refer to technical information. For assembly in material with hardness not exceeding HV 115. Packaging Diameter M3 M4 M5 M6 No. per pack 500 200 100 100
Bumax RX-Plastite No. threads/inch 4-20 6-19 8-16 10-14 d 3.1 3.6 4.6 5.3 dk 5.6 7 8.0 9.5 k 2 2.5 2.9 3.5 Driver no. 1 2 2 2 Hole diameter 2.5-2.7 3.0-3.2 3.8-4.0 4.4-4.7 Thread Screw length Approximate weight per 100 l kg kg kg kg 8 0.04 10 0.05 12 0.06 0.10 0.17 16 0.8 0.12 0.20 0.26 20 0.14 0.23 0.30 25 0.26 0.34 Sample order: Bumax 316L-RX-Plastite 4-20 8 Packaging Diameter 4-20 6-19 8-16 10-14 No. per pack 500 500 500 500
ISO 4032 Bumax 88 Thread d Pitch of thread s max. m max. Strength classification Approx. weight kg/100 M6 1 10 5.2 80 0.25 M8 1.25 13 6.8 80 0.52 M10 1.5 16 8.4 80 1.2 M12 1.75 18 10.8 80 1.7 M14 2 21 12.8 80 2.5 M16 2 24 14.8 80 3.3 M18 3 27 15.8 80 4.9 M20 2.5 30 18 80 6.4 M24 3 36 21.5 80 11 M27 M30 M36 Sample order: Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 M14 M16 M18 M20 M24 M27 M30 M36 No. per pack 100 100 50 50 50 25 25 25 10 10 10 10
ISO 4032 Bumax 109 Thread d Pitch of thread s max. m max. Strength classification Approx. weight kg/100 M6 1 10 5.2 100 0.25 M8 1.25 13 6.8 100 0.52 M10 1.05 16 8.4 100 1.2 M12 1.75 18 10.8 100 1.7 M16 2 24 14.8 100 3.3 M20 Sample order:bumax 109-M6M M6 Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 M14 M18 M20 No. per pack 100 100 50 25 25 XX XX
ISO 4161 Bumax 88 Thread d Pitch of thread s max. m max. e min dc-max. Strength classification Approx. weight kg/100 M6 1 10 6 11.05 14.2 80 0.35 M8 1.25 13 8 14.38 17.9 80 0.70 M10 1.5 15 10 16.64 21.8 80 1.2 M12 1.75 18 12 20.03 26 80 2.1 M16 2 24 16 26.75 34.5 80 4.1 M20 2.5 30 20 32.95 42.8 80 7.3 Sample order: Bumax 88-MF6M M6 Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 M16 No. per pack 100 100 50 25 25
Bumax Lock 88 Thread d Pitch of thread s max. m max. e min dc-max. Strength classification Approx. weight kg/100 Flange M6 1 10 6 11.05 14.02 80 0.35 M8 1.25 13 8 14.38 17.09 80 0.7 M10 1.5 (16) 15 10 16.64 21.08 80 1.2 M12 1.75 18 12 20.03 26 80 2.1 Collar M12 1.75 18 12 20.03 80 1.9 M16 2 24 16 26.75 80 3.8 M20 2.5 30 20 32.95 80 7.2 Sample order: Bumax Lock 88 M6M6-M12: with flange M12-M20: with collar. To be fitted with the collar downward against the base. Supplied anti-friction conditioned. Packaging Diameter M6 M8 M10 M12 M16 No. per pack 100 100 50 50 25
ANSI B 18.2.2 Bumax 88 Thread d No. of threads per inch s inch s mm m mm e (min) mm Strength classification Approx. weight kg/100 1/4 UNC 20 7/16 11.1 05.06 12.39 80 0.32 5/16 UNC 18 1/2 12.7 06.07 14.15 80 0.47 3/8 UNC 16 9/16 14.3 08.03 15.95 80 0.69 7/16 UNC 14 11/16 17.5 09.05 19.05 80 1.3 1/2 UNC 13 3/4 19.1 11.01 21.34 80 1.6 5/8 UNC 11 15/16 23.8 13.09 26.69 80 3.2 3/4 UNC 10 1.1/8 28.6 16.03 31.85 80 5.3 7/8 UNC 9 1.5/16 33.3 19.01 37.21 80 9.2 1 UNC 8 1.1/2 38.1 21.08 42.55 80 14 Sample order:bumax 88-U6M 1/4 UNCSince no particular requirement has been specified regarding the shape of the nut, the designation U6M has been given.u6m means that any design of U6FM, U6AM or U6PM is approved by the purchaser. Bulten Stainless normally supplies 1 design in accordance with U6FM unless otherwise specified. Supplied anti-friction conditioned. Packaging Diameter 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1" No. per pack 100 100 50 50 50 25 25 10 10
ISO 7089 Bumax 88 Hole diameter d D t For screw and nut with M thread For screw and nut with Imperial thread Approx. weight kg/100 5.3 10 1 5 Nr 10 0.044 6.4 12 1.6 6 0.10 6.7 14 1.5 1/4 0.13 8.4 16 1.6 8 5/16 0.18 10 18 2 3/8 0.26 10.5 20 2 10 0.36 13 24 2.5 12 0.63 13.5 24 2 1/2 0.47 15 28 2.5 14 0.86 17 30 3 16 5/8 1.1 19 34 3 18 1.5 21 37 3 20 3/4 1.7 23 39 3 22 7/8 1.8 25 44 4 24 3.2 3.2 26 45 4 1 3.2 Sample order: Bumax 88-RB 5.3 Recommended for Bumax 88. Packaging Diameter 5.3-6.7 8.4-23 25-26 No. per pack 200 100 50
ISO 7089 Bumax 109 Hole diameter d D t For screw and nut with M thread For screw and nut with Imperial thread Approx. weight kg/100 6.4 12 1.6 6 0.10 8.4 16 1.6 8 5/16 0.18 10.5 20 2 10 0.36 13 24 2.5 12 0.63 15 17 19 21 Packaging Diameter 06.04 8.4-13 No. per pack 200 100
ISO 7093 Bumax 88 Hole diameter d1 d2 h For screw and nut with M thread For screw and nut with Imperial thread Approx. weight kg/100 6.4 18 1.6 6 0.28 8.4 24 2 8 5/16 0.62 10.5 30 2.5 10 1.2 13 37 3 12 2.2 Sample order: Bumax A4-SS2343-RBS 6.4 Packaging Diameter 6.4 8.4-13 No. per pack 200 100
DIN 938 Bumax 88 Thread d M6 M8 M10 M12 M16 M20 Pitch of thread 1 1.25 1.5 1.75 2 2.5 Length of thread engagement x1 2.5 3.2 3.8 4.3 5 6.3 b2 för l < 125 18 22 26 30 38 46 b2 för l > 125 44 52 b1 6 8 10 12 16 20 Length Approximate weight per 100 l kg kg kg kg kg kg 20 0.93 1.5 25 0.57 1.8 2.7 30 0.68 1.3 2.0 2.9 35 0.79 1.5 3.4 6.7 40 1.6 2.6 3.9 7.2 13 45 2.9 4.3 8.1 50 2.0 3.2 4.8 8.9 14 55 9.8 60 3.9 5.7 11 17 65 4.2 11 70 12 80 22 135 26 160 26 Sample order: Bumax 88-PS M6x25 Lengths above the stepped line have length of thread engagement b2 = l-(x1+3). Packaging Diameter M6 M8 M10 M12 M16 M20 No. per pack 100 50 50 25 25 10
SS 1460 Bumax 88 Thread d M6 M8 M10 M12 M16 M20 Pitch of thread 1 1.25 1.5 1.75 2 2.5 Length of thread engagement b 1) 1) 1) 1) 1) 1) threaded end bm 10 12 15 17 22 27 Screw length Approximate weight per 100 It kg kg kg kg kg kg 30 0.53 35 1.1 40 0.73 1.3 2.0 2.9 50 0.95 1.7 2.6 3.6 6.6 60 2.1 3.2 4.4 8.0 70 3.8 5.3 9.2 15 80 11 17 100 21 Sample order: Bumax 88-MPS M6x30 1) Length of thread engagement b varies with screw lengths. Refer to the current screw standard. Packaging Diameter M6 M8 M10 M12 M16 M20 No. per pack 100 50 50 25 25 10
DIN 976 Form B Bumax 88 Thread d Pitch of thread It mm Approx. weight kg/100 Strength classification M5 0.8 1000 12 80 M6 1 1000 18 80 M8 1.25 1000 32 80 M10 1.5 1000 50 80 M12 1.75 1000 73 80 M14 2 1000 99 80 M16 2 1000 133 80 M18 2.5 1000 165 80 M20 2.5 1000 208 80 M22 2.5 1000 256 80 M24 3 1000 300 80 M27 3 1000 388 80 M30 3.5 1000 474 80 M33 3.5 1000 581 80 M36 4 1000 689 80 Sample order: Shorter lengths can be cut of/made to order Packaging 1 pcs in plastic sleeve
Product description MarkingThe stock range of hexagon head bolts and screws socket head cap screws, Hexagon nuts and Bumax lock nuts are normally marked in accordance with the figure below.example: Exceptions: Dimensions < M5 do not contain some of the marking due to space restriction. Sub-contracted products may have different marking. The steel grade is normally marked. Manufacturers mark (BUMAX ), steel grade (e.g. A4-316L), and property class (e.g. 80). Property classes and marking in accordance with ISO 3506. Note the difference in property class designation between Stainless steel and carbon steel fasteners. Imperial threaded fasteners are not covered by ISO 3506 but we follow the ISO standard as well were it is possible. Finishing: Our products are supplied bright or passivated, which gives the best corrosion resistance. The Bumax 88 programme of nuts and washers and the full range of Bumax 109 are supplied treated with lubricant in order to avoid thread galling. Bumax Hard is supplied coated, M8 lubricated in addition. All lock nuts, both Nylon insert and Bumax Lock are supplied lubricated. Choice of material: Stainless steel A2 can be used in combination with most Stainless steel grades with similar or lower corrosion resistance. A2 is suitable for outdoor applications but not in coastal areas and only to a limited extent in oxidising acids. A4 is suitable for outdoor applications also in coastal areas and for normal corrosion expose. Bumax A4 SS14.2343 / 316L HiMo can also be used to a limited extent seawater containing chlorides and in non-oxidising acids. For harsh corrosive conditions, we recommend that material is selected in consultation with our engineers or those at the steelworks. Examples of commonly occurring Stainless steels are: Ferrit-autenitic steel: EN 1.4462 = Sandvik SAF 2205 = UNS S31803 (Duplex). EN 1.4410 = Sandvik SAF 2507 = UNS S32750 (Super Duplex). Austenitic steel: Avesta 254 SMO = UNS 5 3124, EN1.4547. Sandvik SANICRO 28 = UNS N 08028 = EN 1.4563. Autenitiska stål for use at elevated temperatures: SS 14 2570 = AISI 660. EN 1.4835 Avesta 253 MA = UNS S30815. Sandvik SANICRO 30 = UNS NO 08800. Sandvik SANICRO 31 H = UNS NO 08810. EN 1.4845 SS 14 2361 = AISI 310. Note: EEN 1.4462, 4410 and to some extend SS1.2324 are suitable for machining of fasteners and components were high strength and low elongation co-efficient is required and were this cannot be achieved with Austenitic Stainless steel. SS 14 2570 is an Austenitic Stainless steel for use at elevated temperatures with excellent mechanical properties. SS 14 2361 (SÅ3) is a heat resistant Stainless steel. SS 14 2302, 2303 (Cl) and SS 2321 (C3) have limited corrosion resistance but can achieve good mechanical properties through hardening. Self-tapping screws (sheet metal screws) We stock self-tapping screws in steel A2, A4 and A4 ss14.2343 / 316L HiMo. The steels have good corrosion resistance and are designed for normal corrosive conditions. The screws can easily be fitted to all plastics and light metals. When used in low and high alloy steel plate the threads can be deformed due to deformation hardening from the punching or the drilling operation. When the material thickness is > 0,5 x the thread pitch material hardness may not exceed 115 HV. ISO-standard: In 1983 ISO issued a revised thread standard for self-tapping screws, ST-threads, "ISO 1478-1983 Tapping screw thread". The change in dimensions is marginal and concerns a reduction in the lower limit for the outside diameter. One important change is however, that the thread must be specified by the thread diameter. A specific screw may therefore be designated ST 3,5 x 19 were ST stands for self-tapping, 3,5 for the outside diameter of the thread and 19 for the screw length. Conversion between the two system is as follows: 5T2,2 5T2,9 5T3,5 5T4,2 5T4,8 5T5,5 5T6,3 B2 B4 B6 B8 B10 B12 B14 ISO Type C = cone end. ISO type F = flat end. When material hardness HV > 115 we recommend Bumax Hard or if the corrosion exposure permits, screws made from C1 steel which are manufactured as special to order. For more information about Bumax Hard ST screws, please look at "Bumax Hard Taptite and ST. The friction problems with Austenitic Stainless ST screws can be considerably reduced by surface treatment or by lubricant. Assembly: When assembling Stainless steel joints, a very low revolution screw-driving machine is required or preferably the screws should be tightened by hand. Punching machines should not be used. In very unfavourable assembling conditions, MoS2 or suchlike lubricant is recommended. If considerable galling problems occur when assembly, please contact our technical customer service. BUMAX Lock: BUMAX Lock is a special all metal lock nuts: The special feature is the designed thread profile making the nut free spinning and locks when tightened. Note that a higher tightening torque than for standard nuts is required. Taptite and Plastite: Taptite is a thread forming screw for use in soft material such as light metal and plastic. Bumax Hard Taptite is developed for use in steel and Stainless Steel. Plastite is a thread forming screw for use in plastic. Both Taptite and Plastite have a trilobular cross-section and excellent function. For BUMAX Hard, click here.
Tightening torque and force Tightening torque, preload, failure load and yield load Thread size and class Class M3 M4 M5 M6 M8 M10 M12 M14 M16 M18 M20 Tightening Torque MV in Nm 1), 3) BUMAX 129 2.1 4.9 9.7 17 40 79 136 217 333 463 649 BUMAX 109 1.7 4.1 8.1 14 34 66 115 162 248 344 481 BUMAX 88 1.3 2.9 5.7 10 25 47 82 129 198 275 385 BUMAX Lock 6.6 12 29 54 94 228 442 80 1.2 2.7 5,4 9 22 44 76 121 187 261 364 70 0.9 2 4 7 17 33 57 91 140 195 273 50 0.14 1 2 3 8 15 27 43 65 91 127 Preload applied kn ± 23% 2) BUMAX 129 3.5 6.2 10 14 26 41 59 81 110 135 172 BUMAX 109 2.9 5.2 8.6 12 21 34 49 60 81 100 128 BUMAX 88 2.1 3.6 5.9 8.4 15 24 35 48 65 80 102 BUMAX Lock 8.4 15 24 35 65 102 80 2.0 3.4 5.5 7.8 14 23 33 45 61 76 96 70 1.5 2.6 4.2 5.9 11 17 25 34 47 57 72 50 0.8 1.4 1.9 2.7 5 8 12 16 21 27 33 Failure load kn BUMAX 129 6 10.5 17 24 44 70 101 138 188 230 294 BUMAX 109 5 8.8 14 20 37 58 84 115 157 192 245 BUMAX 88 4 7 11 16 29 46 67 92 126 154 196 BUMAX Lock 11 16 29 46 67 126 196 80 4 7 11 16 29 46 67 92 126 154 196 70 3.5 6.1 9.9 14 26 41 59 81 110 134 172 50 2.5 4.4 7,1 10 18 29 42 58 79 96 123 Yield Load kn BUMAX 129 5.4 9.5 15 21.5 39.5 62.5 91 124 170 207 265 BUMAX 109 4.5 8 13 18 33 52 76 92 125 154 196 BUMAX 88 3.2 6 9 13 23 37 54 74 100 123 157 BUMAX Lock 9 13 23 37 54 100 157 80 3 5 8 12 22 35 51 69 94 115 147 70 2.2 4 6 9 16 26 38 52 71 86 110 50 1.3 2 3 4 8 12 18 24 33 40 51 Nominal stress area mm² 5.03 8.78 14.2 20.1 36.6 58.0 84.3 115 157 192 245 Pitch of thread 0.5 0.7 0.8 1.0 1.25 1.5 1.75 2.0 2.0 2.5 2.5 Thread size and class Class M24 M27 M30 M36 Tightening Torque Mv in Nm 1), 3) BUMAX 88 665 961 1310 2280 BUMAX Lock 765 80 629 909 1240 2160 70 472 682 930 1620 50 220 318 434 755 Preload applied KN ± 23% 2) BUMAX 88 181 235 287 418 BUMAX Lock 181 80 138 179 219 319 70 103 134 164 239 50 48 63 77 112 Failure load KN BUMAX 88 282 367 449 654 BUMAX Lock 282 80 282 367 449 654 70 247 321 393 572 50 177 230 281 409 Yield load KN BUMAX 88 226 294 359 523 BUMAX Lock 226 80 212 275 337 490 70 159 207 253 368 50 74 96 118 172 Nominal stress area mm² 353 459 561 817 Pitch of thread 3.0 3.0 3.5 4.0
Thread size and class Class 1/4-20 UNC 5/16-18 UNC 3/8-16 UNC 1/2-13 UNC 5/8-11 UNC 3/4-10 UNC 7/8-9 UNC 1"-8 UNC Tightening Torque Mv in Nm 1), BUMAX 88 11.0 22.0 39.0 95.0 188.0 329.0 527.0 789.0 3) 80 10.0 21.0 37.0 89.0 175.0 308.0 493.0 737.0 70 7.7 16.0 28.0 66.0 131.0 231.0 369.0 553.0 50 3.6 7.3 13.0 31.0 61.0 108.0 172.0 258.0 Preload applied KN ± 23% 2) BUMAX 88 8.7 14.3 21.1 38.7 61.7 91.2 125.9 165.2 80 8.0 13.2 19.5 35.7 56.9 84.2 116.2 152.5 70 6.0 9.9 14.6 26.8 42.7 63.2 87.2 114.4 50 2.8 4.6 6.8 12.5 19.9 29.5 40.7 53.4 Failure load KN BUMAX 88 17.0 28.0 41.5 75.9 121.0 179.0 247.0 325.0 80 17.0 28.0 41.5 75.9 121.0 179.0 247.0 325.0 70 14.3 23.6 35.0 64.1 102.2 151.2 208.6 273.7 50 10.2 16.9 25.0 45.7 73.0 108.0 149.0 195.5 Yield load KN BUMAX 88 13.1 22.4 33.2 60.8 96.9 143.4 197.9 259.6 80 12.3 20.3 30.0 54.9 87.6 129.6 178.8 234.6 70 9.2 15.2 22.5 41.2 65.7 97.2 134.1 175.9 50 4.3 7.1 10.5 19.2 30.7 45.4 62.6 82.1 Nominal stress area mm² 20.5 33.8 50.0 91.5 146.0 216.0 298.0 391.0 1) The Mv recommendations refer to burr-free surfaces lubricated with a good quality lubricant. 2) The preload applied is calculated as 65% of Rp 0,2 but in practice the value can be expected to vary between 50-80% 3) The Mv recommendations are calculated assuming a coefficient of friction of 0,16 wwhich requires a good quality lubricant. Hole sizes and torque for Taptite Description Material thickness Dimensions M3 M4 M5 M6 M8 M10 Hole size 0.1-1.5 2.7 3.65 1.51-2.5 2.8 3.65 4.6 5.5 2.51-4 2.8 3.7 4.7 5.6 7.5 9.3 4.01-6.5 2.85 3.75 4.7 5.6 7.5 9.3 6.51-10 3.8 4.75 5.65 7.6 9.4 10.01-15 5.7 7.7 9.5 15.01-20 7.7 9.6 Breaking Torque in Nm min Property-class BUMAX Hard 4.5 7.9 13 20 30 52 Standard TT 2.2 3.8 7.8 13 32 45 Tightening Torque Mv in Nm BUMAX Hard 1.3 3 6 12 25 49 Standard TT 1.2 2.7 5.4 9.3 22 40 1) The Mv recommendations refer to burr-free surfaces lubricated with a good quality lubricant. 2) The Mv-recommendations are calculated assuming a coefficient of friction of 0.16 that requires a good-quality lubricant. Assembling When assembling Stainless joints, a very low revolution screw-driving machine is required or the screws should be tightened by hand. Punching screw-driving machines should not be used. In very unfavourable assembling conditions MoS2 or suchlike is recommended. If considerable thread galling problems occur when assembling, please contact our technical customer service.
Grades BUMAX Product portfolio All values are nominal unless stated otherwise Grades Trade name EN UNS Micro structure A2: Widely used grade for moderate corrosive environments. A4: Widely used grade with good corrosion resistance in chloride-bearing media. BUMAX 88, 109: BUMAX 88 and 109 AISI 316L, offers higher mechanical properties and 316LHigh Mo better corrosion resistance than standard A4 due to higher Molybdenum content. Generally tighter tolerances on all elements as well as lower max limit of trace elements compared with standard A4. BUMAX SuperAustenite: High-alloy austenitic stainless steel for use in seawater and other aggresive chloride bearing medias. High resistance to general crevice, pitting and stress corrosion. BUMAX Duplex: Bumax Duplex is characterized by excellent strength, ductility and fatigue resistance in combination with good general, pitting, crevice and stress corrosion properties. C max Cr Ni Mo Other Max temp¹ AISI 304 1.4301 S30400 Austenitic 0.07 17-19.5 8-10.5-300ºC (570ºF) AISI 316 1.4401 S31600 Austenitic 0.08 16.5-18.5 10.5-13 2-2.5 300ºC (570ºC) 1.4432 S31603 Austenitic 0.03 16.5-18.5 11-13 2.5-3 300ºC (570ºC) 254SMO 1.4547 S31254 Austenitic 20 18 6.2 N, Cu 300ºC (570ºC) SAF2205 1.4462 S31803 S32205 Ferrite-Austenitic 22 5.2 3.2 N 0.18 300ºC (570ºC) BUMAX SuperDuplex: Bumax SuperDuplex is characterized by excellent mechanical properties and very good corrosion resistance. Excellent resistance to general crevice, pitting and stress corrosion in chloride bearing medias. SAF2507 1.4410 S32750 Ferrite-Austenitic 0.03 25 7 4 N 0.3 300ºC (570ºC) BUMAX HyperDuplex: Bumax Hyperduplex is a groundbreaking alloy used in the most demanding applications. Suited for use in severe environments such as hot chlorinated sea-water and for aggressive acidic chloride containing media in chemical, oil, gas and petrochemical industry. SAF2707HD 1.4658 S32707 Ferrite-Austenitic 0.03 27 6.5 4.8 N 0.4, Co BUMAX Ultra: BUMAX Ultra is a unique Sandvik precipitation hardenable stainless steel Nanoflex that can be delivered in Ultra high strength levels. Strongest stainless steel on the market. Good corrosion resistance in chloride environments. A286: High temperature resistant material for applications requiring high strength and god oxidation resistance at temperatures up to 700ºC. Can be precipitation hardened. Nimonic80A: Precipitation hardenable high temperature resistant material with good oxidation resistance and high tensile and creep properties at temperatures up to 815ºC. Alloy 286, AISI 660 Nimonic80A, Alloy 80A S46910 Martensitic 0.02 12 9 4 Al, Ti, Cu 300ºC (570ºC) 350ºC (840ºF) 1.4980 S66286 Austenitic 0.08 15 26 1.5 Ti, V 700ºC (1300ºF) 2.4952 N07080 Austenitic 0.10 19 >65 - Al, Ti, Co 815ºC (1500ºF) Pre² 25 25 27 43 36 42 49 25 ¹ Max recommended service temperature. Mechanical properties are affected by cryogenically and elevated temperatures, for more information see chapter: "Temperature effect on the mechanical properties". ² A parameter for comparing the resistance of different steels to pitting corrosion is the PRE number (Pitting Resistance Equivalent). The PRE is defined as, in weight-%:pre= % Cr + 3.3 x % Mo + 16 x % N Other grades can be offered on request: AISI 302, 310, 321, 904L, LDX 2101, Hastelloy, Inconel Alloy 600, 601, X750, 625, 718, Incoloy Alloy 800HT, 825, 28, Monel Alloy 400, 253MA.
Physical properties All values are nominal unless stated otherwise Modulus of Elasticity GPa (10³ ksi) 20ºC (86ºF) Grades *20 to 100ºC (86 to 200ºF) *20 to 200ºC (86 to 400ºF) *20 to 300ºC (86 to 600ºF) Resistivity m ( in.) 20ºC (86ºF) A2 16.5 (9.5) 17.0 (9.5) 17.5 (10) 0.80 (31) 190 (27.7) 1.800 A4 16.5 (9.5) 17.0 (9.5) 17.5 (10) 0.80 (31) 190 (27.7) 1.03 BUMAX 88, 109 16.5 (9.5) 17.0 (9.5) 17.5 (10) 0.80 (31) 190 (27.7) 1.007 BUMAX SuperAustenite 16 (9) 16 (9) 16.5 (9.5) 0.84 (33) 195 (28) 1.003 BUMAX Duplex 12.5 (7) 13 (7.5) 13.5 (7.5) 0.84 (33) 200 (29) 50 BUMAX SuperDuplex 12.5 (7) 13 (7.5) 13.5 (7.5) 0.83 (32.7) 200 (29) 50 BUMAX HyperDuplex 12.5 (7) 13 (7.5) 13.5 (7.5) 0.75 (29.5) 200 (29) 50 BUMAX Ultra 11.5 (6.5) 12 (6.5) 12 (7) 0.83 (32.7) 190 (27.5) 1000 A286 16.5 (9.5) 16.5 (9.5) 17 (9.5) 0.91 (35.8) 200 (29.5) 1.007 Nimonic80A 13 (7.5) 13.5 (7.5) 13.5 (7.5) 1.24 (48.8) 210 (30) 1.001 Max relative permeability 20ºC (86ºF) * Thermal expansions, mean values in temperature ranges (x10-6 ) per C (ºF) Corrosion resistance The corrosion properties of a stainless steel are defined mainly by the ability to form a protective passive layer of Chromium Oxide, and to remain in the passive state in the actual environment. When passivity cannot be maintained, due to a too aggressive environment, the metal will be exposed to the surrounding environment and corrosion will occur. The Pitting Resistance Equivalent value (PRE 1) ) gives a good indication of the pitting and crevice corrosion resistance as a function of the alloying content. The corrosion resistance of a stainless steel fastener is not only defined by the chemical composition of the steel, but by many other factors such as, fastening design, surface quality, stresses and presence of crevices. Environmental factors as concentration of chloride ions, chemical composition of the corrosion environment, temperature, ph, pressure and oxidizing agents is important information to determine the material resistance and selecting the right material. Many forms of corrosion exists, the most common types are described below. General corrosion: Characterized by a uniform corrosion over the surface. It is therefore common to define a corrosion rate as mean metal lost per unit time, mm/year or milli-inch/year (mpy). Pitting corrosion: Localized to a small area and creates pits in the metal. Pitting corrosion is often much more insidious than general corrosion as a single pit can be starting point of a
failure. Crevice corrosion: Same corrosion principle as pitting corrosion but occurs in crevices. Crevice corrosion can occur in concealed places such as small gaps and contact areas between parts and spaces where corrosive deposits can be retained. Correctly selected material in combination with a good design and cleaning will reduce the risk of crevice corrosion. Galvanic corrosion: Two different metals in the same corrosive environment, in which the less noble metal corrodes. The potential difference between the two metals produces a flow of electron from the less noble metal (anodic) to the noble metal (cathodcic). Several factors determine galvanic corrosion potential, the electrochemical potential difference between the two metals, the presence of moisture and the relative surface area ratio. The ranking of materials with regard of potential can be found in galvanic series. The relative surface area of the two metals is very important. When the surface of the noble metal is large relative to the less noble metal, there is an increase in corrosion rate of the less noble material. For an example, carbon steel bolt in stainless steel sheet has a higher corrosion rate than stainless steel bolts in carbon steel sheet, when used in the same environment. Coupling different stainless steel grades together is rarely a problem as the potential difference is too small. Stress corrosion: Stress Corrosion Cracking (SCC) can occur when the metal is exposed to tensile stresses in a corrosive environment, often at elevated temperatures above 60 C. It is an insidious corrosion type as it can lead to unexpected sudden failure of normally ductile metals. The most common media type where SCC occurs is chloride containing solutions. Grades such as BUMAX SA, SD or HD is a must in sever condition such as swimming pool suspended ceilings and corrosive petrochemical, industrial environments. Practical guidelines Evaluate the environment and the likelihood of accumulated deposits. Use a design that minimizes crevices and allows rain to rinse away deposits Use a stainless steel fastener with equivalent or higher corrosion resistance than the component being fastened 1) PRE = % Cr + 3.3 x % Mo + 16 x % N
FIMINOX s.p.a. viteria bulloneria alta resistenza meccanica Via per Carpiano, 18 20077 Melegnano (MI) ITALY Tel +39 02 98 033 501 - Fax +39 02 98 033 502 www.fiminox.it - bumax@fiminox.it