MACHINE SCREWS AND NUTS

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1 Previous page Machinery's Handbook 27th Edition MACHINE SCREWS 1587 MACHINE SCREWS AND NUTS American National Standard Machine Screws and Machine Screw Nuts. This Standard ANSI B covers both slotted and recessed head machine screws. Dimensions of various types of slotted machine screws, machine screw nuts, and header points are given in Tables 1 through 12. The Standard also covers flat trim head, oval trim head and drilled fillister head machine screws and gives cross recess dimensions and gaging dimensions for all types of machine screw heads. Information on metric machine screws B18.6.7M is given beginning on page Threads: Except for sizes 0000, 000, and 00, machine screw threads may be either Unified Coarse (UNC) and Fine thread (UNF) Class 2A (see American Standard for Unified Screw Threads starting on page 1732) or UNRC and UNRF Series, at option of manufacturer. Thread dimensions for sizes 0000, 000, and 00 are given in Table 7 on page Threads for hexagon machine screw nuts may be either UNC or UNF, Class 2B, and for square machine screw nuts are UNC Class 2B. Length of thread: Machine screws of sizes No. 5 and smaller with nominal lengths equal to 3 diameters and shorter have full form threads extending to within 1 pitch (thread) of the bearing surface of the head, or closer, if practicable. lengths greater than 3 diameters, up to and including inch, have full form threads extending to within two pitches (threads) of the bearing surface of the head, or closer, if practicable. Unless otherwise specified, screws of longer nominal length have a minimum length of full form thread of 1.00 inch.machine screws of sizes No. 6 and larger with nominal length equal to 3 diameters and shorter have full form threads extending to within 1 pitch (thread) of the bearing surface of the head, or closer, if practicable. lengths greater than 3 diameters, up to and including 2 inches, have full form threads extending to within 2 pitches (threads) of the bearing surface of the head, or closer, if practicable. Screws of longer nominal length, unless otherwise specified, have a minimum length of full form thread of 1.50 inches. Table 1. Square and Hexagon Machine Screw Nuts ANSI B (R1991) Nom. F G Basic Basic F H Max. F Min. F F Max. G All dimensions in inches. Hexagon machine screw nuts have tops flat and chamfered. Diameter of top circle should be the maximum width across flats within a tolerance of minus 15 per cent. Bottoms are flat but may be chamfered if so specified. Square machine screw nuts have tops and bottoms flat without chamfer. G 1 Min. G H Max. G 1 Min. G 1 Optional; See Note Max. H Min. H

2 1588 MACHINE SCREWS Diameter of body: The diameter of machine screw bodies is not less than Class 2A thread minimum pitch diameter nor greater than the basic major diameter of the thread. Crossrecessed trim head machine screws not threaded to the head have an in. minimum length shoulder under the head with diameter limits as specified in the dimensional tables in the standard. Designation: Machine screws are designated by the following data in the sequence shown: size (number, fraction, or decimal equivalent); threads per inch; nominal length (fraction or decimal equivalent); product name, including head type and driving provision; header point, if desired; material; and protective finish, if required. For example: Slotted Pan Machine Screw, Steel, Zinc Plated Type IA Cross Recessed Fillister Machine Screw, Brass Machine screw nuts are designated by the following data in the sequence shown: size (number, fraction, or decimal equivalent); threads per inch; product name; material; and protective finish, if required. For example: Hexagon Machine Screw Nut, Steel, Zinc Plated Square Machine Screw Nut, Brass Table 2. American National Standard Slotted 100-Degree Flat Countersunk Machine Screws ANSI B (R1977) T A J a or Basic Screw Max., Edge Sharp, A Min., Edge Rounded H Height, H Slot Width, J Slot Depth, T or Flat Ref. Max. Min. Max. Min a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted. All dimensions are in inches. L

3 MACHINE SCREWS 1589 Table 3. American National Standard Slotted Flat Countersunk and Close Tolerance 100-Degree Flat Countersunk Machine Screws ANSI B (R1991) a or Basic Screw Max., L b a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted. b These lengths or shorter are undercut. c May be rounded or flat. All dimensions are in inches. SLOTTED FLAT COUNTERSUNK HEAD TYPE, A Height, H Max., Edge Sharp Min., Edge c Slot Width, J Slot Depth, T Ref. Max. Min. Max. Min a or Basic Screw CLOSE TOLERANCE 100-DEGREE FLAT COUNTERSUNK HEAD TYPE Diameter, A Slot Slot Max., Height, Width, Depth, Min., Edge H J T Edge Sharp c Ref. Max. Min. Max. Min

4 1590 MACHINE SCREWS Table 4. American National Standard Slotted Undercut Flat Countersunk and Plain and Slotted Hex Washer Machine Screws ANSI B (R1991) SLOTTED UNDERCUT FLAT COUNTERSUNK HEAD TYPE a or Basic Screw Max., L b Max., Edge Sharp, A Height, H Slot Width, J Slot Depth, T Min., Edge Rnded. or Flat Max. Min. Max. Min. Max. Min a When specifying nominal size in decimals, zeros preceding the decimal point and in the fourth decimal place are omitted. b These lengths or shorter are undercut. PLAIN AND SLOTTED HEX WASHER HEAD TYPES a or Basic Screw Width Across Flats, A All dimensions are in inches. Width Across- Corn., W Height, H Washer, B Washer Thick., U Slot a Width, J a Unless otherwise specified, hexagon washer head machine screws are not slotted. Slot a Depth, T Max. Min. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min

5 MACHINE SCREWS 1591 Table 5. American National Standard Slotted Truss and Plain and Slotted Hexagon Machine Screws ANSI B (R1991) SLOTTED TRUSS HEAD TYPE a or Basic Screw, A Height, H Radius, R Slot Width, J Slot Depth, T Max. Min. Max. Min. Max. Max. Min. Max. Min a Where specifying nominal size in decimals, zeros preceding decimal points and in the fourth decimal place are omitted. PLAIN AND SLOTTED HEXAGON HEAD TYPES a or Basic Screw Regular Width Across Flats, A All dimensions are in inches. Across Corn., W Width Across Flats, A Large Across Corn., W Height, H a Unless otherwise specified, hexagon head machine screws are not slotted. Slot a Width, J Slot a Depth, T Max. Min. Min. Max. Min. Min. Max. Min. Max. Min. Max. Min

6 1592 MACHINE SCREWS Table 6. American National Standard Slotted Pan Machine Screws ANSI B (R1991) a or Basic Screw, A a Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place are omitted. All dimensions are in inches. Table 7. Nos. 0000, 000 and 00 Threads ANSI B (R1991) Appendix All dimensions are in inches. Height, H Radius, R Slot Width, J Slot Depth, T Max. Min. Max. Min. Max. Max. Min. Max. Min a and Threads Per Inch or or or or Series Designat. Class External b Internal c Major Pitch Pitch Major Diameter Diameter Minor Diameter Max. Min. Max. Min. Tol. Min. Max. Tol. Min. NS NS NS NS a Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place are omitted. b There is no allowance provided on the external threads. c The minor diameter limits for internal threads are not specified, they being determined by the amount of thread engagement necessary to satisfy the strength requirements and tapping performance in the intended application. Class

7 MACHINE SCREWS 1593 Table 8. American National Standard Slotted Fillister and Slotted Drilled Fillister Machine Screws ANSI B (R1991) 1 or Basic Screw, A SLOTTED FILLISTER HEAD TYPE Side Height, H Total Height, O Slot Width, J Slot Depth, T Max. Min. Max. Min. Max. Min. Max Min. Max. Min or Basic Screw, A All dimensions are in inches. SLOTTED DRILLED FILLISTER HEAD TYPE Side Height, H Total Height, O Slot Width, J Slot Depth, T Drilled Hole Locat., E Drilled Hole., F Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Basic Basic Where specifying nominal size in decimals, zeros preceding decimal points and in the fourth decimal place are omitted. 2 Drilled hole shall be approximately perpendicular to the axis of slot and may be permitted to break through bottom of the slot. Edges of the hole shall be free from burrs. 3 A slight rounding of the edges at periphery of head is permissible provided the diameter of the bearing circle is equal to no less than 90 per cent of the specified minimum head diameter.

8 1594 MACHINE SCREWS Table 9. American National Standard Slotted Oval Countersunk Machine Screws ANSI B (R1991) All dimensions are in inches., A Side Height, H, Total Height, O Slot Width, J Table 10. American National Standard er Points for Machine Screws before Threading ANSI B (R1991) Slot Depth, T Max Min., a L b Max., Edge Edge or Basic Rnded. Sharp Screw or Flat Ref. Max. Min. Max. Min. Max. Min a When specifying nominal size in decimals, zeros preceding decimal points and in the fourth decimal place are omitted. b These lengths or shorter are undercut. Nom. Threads Max. Min. Max per Inch P P L All dimensions in inches. Edges of point may be rounded and end of point need not be flat nor perpendicular to shank. Machine screws normally have plain sheared ends but when specified may have header points, as shown above. Nom. 10 Threads per Inch Max. P Min. P Max. L 1 1 4

9 MACHINE SCREWS 1595 Table 11. American National Standard Slotted Binding and Slotted Undercut Oval Countersunk Machine Screws ANSI B (R1991) a or Basic Screw, A All dimensions are in inches. Total Height, O SLOTTED BINDING HEAD TYPE Oval Height, F Slot Width, J Slot Depth, T Undercut b, U Undercut b Depth, X Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min a Where specifying nominal size in decimals, zeros preceding decimal points and in the fourth decimal place are omitted. b Unless otherwise specified, slotted binding head machine screws are not undercut. a or Basic Screw Max. L a a These lengths or shorter are undercut. SLOTTED UNDERCUT OVAL COUNTERSUNK HEAD TYPES Max., Edge Sharp, A Side Height, H Total Height, O Slot Width, J Slot Depth, T Min., Edge Rnded. or Flat Ref. Max. Min. Max. Min. Max. Min

10 1596 MACHINE SCREWS Table 12. Slotted Round Machine Screws ANSI B (R1991) Appendix a or Basic Diameter, A Height, H Slot Width, J Slot Depth, T Screw Max. Min. Max. Min. Max. Min. Max. Min a When specifying nominal size in decimals, zeros preceding decimal point and in the fourth decimal place are omitted. All dimensions are in inches. Not recommended, use Pan machine screws. ANSI Cross References for Machine Screws and Metric Machine Screw Type I Cross Recess Type IA Cross Recess Type III Square Center Type II Cross Recess Machine Screw Cross Recesses. Four cross recesses, Types I, IA, II, and III, may be used in lieu of slots in machine screw heads. Dimensions for recess diameter M, width N, and depth T (not shown above) together with recess penetration gaging depths are given in American National Standard ANSI B (R1991) for machine screws, and in ANSI/ASME B18.6.7M-1985 for metric machine screws. American National Standard Metric Machine Screws. This Standard B18.6.7M covers metric flat and oval countersunk and slotted and recessed pan head machine screws and metric hex head and hex flange head machine screws. Dimensions are given in Tables 1 through 4 and 6.

11 MACHINE SCREWS 1597 Table 1. American National Standard Thread Lengths for Metric Machine Screws ANSI/ASME B18.6.7M-1985 Pan, Hex, and Hex Flange Screws Screw and Thread Pitch All dimensions in millimeters. Flat and Oval Countersunk Screws Heat-Treated Recessed Flat Countersunk Screws L L US L U L L US L U L L B Screw Length Equal to or Shorter than a Unthreaded Length b Max d Max e Over Screw Length a Unthreaded Length b Screw Length Longer than a Full Form Thread Length c To and Including Max d Max e Min M M M M M M M M M M a The length tolerances for metric machine screws are: up to 3 mm, incl., ± 0.2 mm; over 3 to 10 mm, incl., ± 0.3 mm; over 10 to 16 mm, incl., ± 0.4 mm; over 16 to 50 mm, incl., ± 0.5 mm; over 50 mm, ± 1.0 mm. b Unthreaded lengths L U and L US represent the distance, measured parallel to the axis of screw, from the underside of the head to the face of a nonchamfered or noncounterbored standard GO thread ring gage assembled by hand as far as the thread will permit. c Refer to the illustrations for respective screw head styles. d The L US values apply only to heat treated recessed flat countersunk head screws. e The L U values apply to all screws except heat treated recessed flat countersunk head screws.

12 Table 2. American National Standard Slotted, Cross and Square Recessed Flat Countersunk Metric Machine Screws ANSI/ASME B18.6.7M Screw and Thread Pitch M2 0.4 b Slotted and Style A D S Body Diameter D SH a Body and Shoulder Diameter Shoulder Diameter Style B D S Body Diameter L SH a Shoulder Length D K K R N T Diameter Underhead Theoretical Fillet Slot Slot Sharp Actual Height Radius Width Depth Max Ref Max Min Max Min Max Min Max Min Max Min Min Max Min Max Min Min M M M M M M M M a All recessed head heat-treated steel screws of property class 9.8 or higher strength have the Style B head form. Recessed head screws other than those specifically designated to be Style B have the Style A head form. The underhead shoulder on the Style B head form is mandatory and all other head dimensions are common to both the Style A and Style B head forms. b This size is not specified for Type III square recessed flat countersunk heads; Type II cross recess is not specified for any size. MACHINE SCREWS All dimensions in millimeters. For dimension B, see Table 1. For dimension L, see Table 7.

13 Table 3. American National Standard Slotted, Cross and Square Recessed Oval Countersunk Metric Machine Screws ANSI/ASME B18.6.7M-1985 Screw and Thread Pitch M2 0.4 a All dimensions in millimeters. For dimension B, see Table 1. For dimension L, see Table 7. D S D K K F R F R N T Diameter Raised Underhead Body Diameter Theoretical Sharp Actual Side Height Height Top Radius Fillet Radius Slot Width Slot Depth Max Max Min Max Min Min Ref Max Approx Max Min Max Min Max Min M M M M M M M M a This size is not specified for Type III square recessed oval countersunk heads; Type II cross recess is not specified for any size. MACHINE SCREWS 1599

14 Table 4. American National Standard Slotted and Cross and Square Recessed Pan Metric Machine Screws ANSI/ASME B18.6.7M Screw and Thread Pitch M2 0.4 a All dimensions in millimeters. For dimension B, see Table 1. For dimension L, see Table 7. Cross and Slotted Square Recess D s D K K R 1 K R 1 Body Diameter Diameter Height Radius Height Radius D A R N T W Underhead Fillet Radius Max Min Max Min Max Min Max Max Min Ref Max Min Max Min Min Min M M M M M M M M a This size not specified for Type III square recessed pan heads; Type II cross recess is not specified for any size. Transition Dia Slot Width Slot Depth Unslotted Thickness MACHINE SCREWS

15 METRIC MACHINE SCREWS 1601 Table 5. American National Standard er Points for Metric Machine Screws Before Threading ANSI/ASME B18.6.7M-1985 D P L Screw and Thread Point Diameter Screw Length Pitch Max Min Max M M M M M M M M M M a er points apply to these nominal lengths or shorter. The pointing of longer lengths may require machining to the dimensions specified. All dimensions in millimeters. The edge of the point may be rounded and the end of point need not be flat nor perpendicular to the axis of screw shank. Threads: Threads for metric machine screws are coarse M profile threads, as given in ANSI B1.13M (see page 1783), unless otherwise specified. Length of Thread: The lengths of threads on metric machine screws are given in Table 1 for the applicable screw type, size, and length. Diameter of Body: The body diameters of metric machine screws are within the limits specified in the dimensional tables (Tables 3 through 4 and 6). Designation: Metric machine screws are designated by the following data in the sequence shown: size and thread pitch; nominal length; product name, including head type and driving provision; header point if desired; material (including property class, if steel); and protective finish, if required. For example: M Slotted Pan Machine Screw, Class 4.8 Steel, Zinc Plated M Type IA Cross Recessed Oval Countersunk Machine Screw, er Point, Brass It is common ISO practice to omit the thread pitch from the product size designation when screw threads are the metric coarse thread series, e.g., M10 stands for M

16 Table 6. American National Standard Hex and Hex Flange Metric Machine Screws ANSI/ASME B18.6.7M-1985 Hex 1602 Screw and Thread Pitch D S Body Diameter S a Hex Width Across Flats Hex Width Across Corners E a K D A R a Dimensions across flats and across corners of the head are measured at the point of maximum metal. Taper of sides of head (angle between one side and the axis) shall not exceed 2 or 0.10 mm, whichever is greater, the specified width across flats being the large dimension. b The M10 size screws having heads with 15 mm width across flats are not ISO Standard. Unless M10 size screws with 15 mm width across flats are specifically ordered, M10 size screws with 16 mm width across flats shall be furnished. Height Transition Dia Underhead Fillet Max Min Max Min Min Max Min Max Min M M M M M M M M M M M b Radius METRIC MACHINE SCREWS

17 Table 6. (Continued) American National Standard Hex and Hex Flange Metric Machine Screws ANSI/ASME B18.6.7M-1985 Hex Flange Screw and Thread Pitch Body Diameter, D S Hex Width Across Flats, S a Hex Width Across Corners, E a Flange Diameter, D C Max Min Max Min Min Max Min Overall Height, K Hex Height, K 1 Min, Flange Edge Thickness, C b Min Flange Top Fillet Radius, R 1 Max Underhead Fillet Max Transition Dia, D A M M M M M M M M M M Min Radius, R a Dimensions across flats and across corners of the head are measured at the point of maximum metal. Taper of sides of head (angle between one side and the axis) shall not exceed 2 or 0.10 mm, whichever is greater, the specified width across flats being the large dimension. b The contour of the edge at periphery of flange is optional provided the minimum flange thickness is maintained at the minimum flange diameter. The top surface of flange may be straight or slightly rounded (convex) upward. All dimensions in millimeters. A slight rounding of all edges of the hexagon surfaces of indented hex heads is permissible provided the diameter of the bearing circle is not less than the equivalent of 90 per cent of the specified minimum width across flats dimension. s may be indented, trimmed, or fully upset at the option of the manufacturer. For dimension B, see Table 1. For dimension L, see Table 7. METRIC MACHINE SCREWS 1603

18 1604 MACHINE SCREWS Table 7. Recommended Screw Lengths for Metric Machine Screws Screw Screw Length M2 M2.5 M3 M3.5 M4 M5 M6 M8 M10 M PH 3 A PH 4 A A PH 5 A A A PH PH 6 A A A A A PH 8 A A A A A A A 10 A A A A A A A A 13 A A A A A A A A A 16 A A A A A A A A A H 20 A A A A A A A A A H 25 A A A A A A A A H 30 A A A A A A A H 35 A A A A A A H 40 A A A A A H 45 A A A A H 50 A A A A H 55 A A A H 60 A A A H 65 A A H 70 A A H 80 A A H 90 A H All dimensions in millimeters. Machinery's Handbook 27th Edition 1 The nominal screw lengths included between the heavy lines are recommended for the respective screw sizes and screw head styles as designated by the symbols. A Signifies screws of all head styles covered in this standard. P Signifies pan head screws. H Signifies hex and hex flange head screws. Table 8. Clearance Holes for Metric Machine Screws ANSI/ASME B18.6.7M-1985 Appendix Basic Clearance Hole Diameter a Screw Close Normal Clearance Loose Clearance b (Preferred) b Clearance b M M M M M M M M M M a The values given in this table are minimum limits. The recommended plus tolerances are as follows: for clearance hole diameters over 1.70 to and including 5.80 mm, plus 0.12, 0.20, and 0.30 mm for close, normal, and loose clearances, respectively; for clearance hole diameters over 5.80 to mm, plus 0.18, 0.30, and 0.45 mm for close, normal, and loose clearances, respectively. b Normal clearance hole sizes are preferred. Close clearance hole sizes are for situations such as critical alignment of assembled components, wall thickness, or other limitations which necessitate the use of a minimal hole. Countersinking or counterboring at the fastener entry side may be necessary for the proper seating of the head. Loose clearance hole sizes are for applications where maximum adjustment capability between the components being assembled is necessary. All dimensions in millimeters.

19 MACHINE SCREWS 1605 British Machine Screws. Many of these classifications of fasteners are covered in British Standards B.S. 57:1951, B.A. Screws, Bolts and Nuts ; BS 450:1958 (obsolescent), Machine Screws and Machine Screw Nuts (BSW and BSF Threads) ; B.S. 1981:1953, Unified Machine Screws and Machine Screw Nuts ; BS 2827:1957 (obsolescent):1957, Machine Screw Nuts, Pressed Type (B.A. and Whitworth Form Threads) ; B.S. 3155:1960, American Machine Screws and Nuts in s Below 1 4 inch Diameter ; and BS 4183:1967 (obsolescent), Machine Screws and Machine Screw Nuts, Metric Series. At a conference organized by the British Standards Institution in 1965 at which the major sectors of British industry were represented, a policy statement was approved that urged British firms to regard the traditional screw thread systems Whitworth, B.A. and BSF as obsolescent, and to make the internationally-agreed ISO metric thread their first choice (with ISO Unified thread as second choice) for all future designs. It is recognized that some sections of British industry already using ISO inch (Unified) screw threads may find it necessary, for various reasons, to continue with their use for some time: Whitworth and B.A. threads should, however, be superseded by ISO metric threads in preference to an intermediate change to ISO inch threads. Fasteners covered by B.S. 57, B.S. 450 and BS 2827:1957 (obsolescent) eventually would be superseded and replaced by fasteners specified by B.S British Standard Whitworth (BSW) and Fine (BSF) Machine Screws. British Standard BS 450:1958 (obsolescent) covers machine screws and nuts with British Standard Whit-worth and British Standard Fine threads. All the various heads in common use in both slotted and recessed forms are covered. shapes are shown on page 1614 and dimensions on page It is intended that this standard will eventually be superseded by B.S. 4183, Machine Screws and Machine Screw Nuts, Metric Series. British Standard Machine Screws and Machine Screw Nuts, Metric Series. British Standard BS 4183:1967 (obsolescent) gives dimensions and tolerances for: countersunk head, raised countersunk head, and cheese head slotted head screws in a diameter range from M1 (1 mm) to M20 (20 mm); pan head slotted head screws in a diameter range from M2.5 (2.5 mm) to M10 (10 mm); countersunk head and raised countersunk head recessed head screws in a diameter range from M2.5 (2.5 mm) to M12 (12 mm); pan head recessed head screws in a diameter range from M2.5 (2.5 mm) to M10 (10 mm); and square and hexagon machine screw nuts in a diameter range from M1.6 (1.6 mm) to M10 (10 mm). Mechanical properties are also specified for steel, brass and aluminum alloy machine screws and machine screw nuts in this standard. Material: The materials from which the screws and nuts are manufactured have a tensile strength not less than the following: steel, 40 kgf/mm 2 (392 N/mm 2 ); brass, 32 kgf/mm 2 (314 N/mm 2 ); and aluminum alloy, 32 kgf/mm 2 (314 N/mm 2 ). The unit, kgf/mm 2 is in accordance with ISO DR 911 and the unit in parentheses has the relationship, 1 kgf = Newtons. These minimum strengths are applicable to the finished products. Steel machine screws conform to the requirements for strength grade designation 4.8. The strength grade designation system for machine screws consists of two figures, the first is 1 10 of the minimum tensile strength in kgf/mm 2, the second is 1 10 of the ratio between the yield stress and the minimum tensile strength expressed as a percentage: 1 10 minimum tensile strength of 40 kgf/mm 2 gives the symbol 4 ; 1 10 ratio % yield stress = 1 10 minimum tensile strength = 8 ; giving the strength grade designation 4.8. Multiplication of these two figures gives the minimum yield stress in kgf/mm 2. Coating of Screws and Nuts: It is recommended that the coating comply with the appropriate part of BS Electroplated Coatings on Threaded Components.

20 1606 MACHINE SCREWS Screw Threads: Screw threads are ISO metric coarse pitch series threads in accordance with B.S ISO Metric Screw Threads, Part 1, Thread Data and Standard Thread Series. The external threads used for screws conform to tolerance Class 6g limits (medium fit) as given in B.S. 3643, ISO Metric Screw Threads, Part 2, Limits and Tolerances for Coarse Pitch Series Threads. The internal threads used for nuts conform to tolerance Class 6H limits (medium fit) as given in B.S. 3643: Part 2. Lengths of Screws: For countersunk head screws the nominal length is the distance from the upper surface of the head to the extreme end of the shank, including any chamfer, radius, or cone point. For raised countersunk head screws the nominal length is the distance from the upper surface of the head (excluding the raised portion) to the extreme end of the shank, including any chamfer, radius, or cone point. For pan and cheese head screws the nominal length is the distance from the underside of the head to the extreme end of the shank, including any chamfer, radius, or cone point. Standard nominal lengths and tolerances are given in Table 5. Lengths of Thread on Screws: The length of thread is the distance from the end of the screw (including any chamfer, radius, or cone point) to the leading face of a nut without countersink which has been screwed as far as possible onto the screw by hand. The minimum thread length is shown in the following table: Thread, d a Thread Length b (Min.) M1 M1.2 (M1.4) M1.6 M2 (M2.2) M2.5 M3 (M3.5) M4 b b b Thread, d a (M4.5) M5 M6 M8 M10 M12 (M14) M16 (M18) M20 Thread Length b (Min.) Machinery's Handbook 27th Edition a Items shown in parentheses are non-preferred. b Threaded up to the head. All dimensions are in millimeters. Screws of nominal thread diameter M1, M1.2 and M1.4 and screws of larger diameters that are too short for the above thread lengths are threaded as far as possible up to the head. In these screws the length of unthreaded shank under the head does not exceed pitches for lengths up to twice the diameter and 2 pitches for longer lengths, and is defined as the distance from the leading face of a nut that has been screwed as far as possible onto the screw by hand to: 1) the junction of the basic major diameter and the countersunk portion of the head on countersunk and raised countersunk heads; and 2) the underside of the head on other types of heads. Diameter of Unthreaded Shank on Screws: The diameter of the unthreaded portion of the shank on screws is not greater than the basic major diameter of the screw thread and not less than the minimum effective diameter of the screw thread. The diameter of the unthreaded portion of shank is closely associated with the method of manufacture; it will generally be nearer the major diameter of the thread for turned screws and nearer the effective diameter for those produced by cold heading. Radius Under the of Screws: The radius under the head of pan and cheese head screws runs smoothly into the face of the head and shank without any step or discontinuity. A true radius is not essential providing that the curve is smooth and lies wholly within the maximum radius. Any radius under the head of countersunk head screws runs smoothly into the conical bearing surface of the head and the shank without any step or discontinuity. The radius values given in Tables 1 and 2 are regarded as the maximum where the shank diameter is equal to the major diameter of the thread and minimum where the shank diameter is approximately equal to the effective diameter of the thread.

21 d a Table 1. British Standard Slotted Countersunk Machine Screws Metric Series BS 4183:1967 (obsolescent) Max. (Theor. Sharp) 2d Diameter D Min. 1.75d Max. 0.5d Height k a sizes shown in parentheses are non-preferred. b See Radius Under the of Screws description in text. c See Dimensions of 90-Degree Countersunk Screws description in text. d See text following table in Lengths of Thread on Screws description in text. e Threaded up to head. All dimensions are given in millimeters. For dimensional notation, see diagram on page Recessed head screws are also standard and are available. For dimensions see British Standard. Thread Length b Thread Run-out a Radius Min. r b 0.45d Min. Max. 2p d Flushness Tolerance c Slot Width n Max. Max. Min. Max. 0.3d Slot Depth t M e M e (M1.4) e M M (M2.2) M M (M3.5) M (M4.5) M M M M M (M14) M (M18) M Min. 0.2d MACHINE SCREWS 1607

22 d a Table 2. British Standard Slotted Raised Countersunk Machine Screws Metric Series BS 4183:1967 (obsolescent) Diameter D Max. (Theor. Sharp) 2d Min. 1.75d Max. 0.5d Height k Min. 0.45d Radius Under r b a sizes shown in parentheses are non-preferred. b See Radius Under the of Screws description in text. c See text following table in Lengths of Thread on Screws description in text. d Threaded up to head. Thread Length b Min. All dimensions are given in millimeters. For dimensional notation see diagram on page Recessed head screws are also standard and available. For dimensions see British Standard. Thread Runout a Max. 2p c Height of Raised Portion f Nom. 0.25d Radius R Slot Width n Nom. Max. Min. Max. 0.5d Slot Depth t M d M d (M1.4) d M M (M2.2) M M (M3.5) M (M4.5) M M M M M (M14) M (M18) M Min. 0.4d 1608 MACHINE SCREWS

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