Belleville Spring Washer Series
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1 Belleville Spring Washer Series High Load in Small Spaces VARIOUS CONFIGURATIONS OF BELLEVILLE WASHERS Single ONE WASHER Parallel ALL WASHERS STACKED THE SAME WAY Series ALL WASHERS STACKED OPPOSITE EACH OTHER Series Parallel A COMBINATION OF THE TWO Lee Spring s series of Belleville Washers are ideal for applications requiring high loads in small spaces with minimal deflection. Belleville Washers are often used to solve vibration, thermal expansion, relaxation and creep problems. The Lee Spring line of Belleville Washers are made of Type 300 Stainless Steel and are passivated to remove contaminants and further improve corrosion resistance. Type 300 Stainless Steel is slightly magnetic and is recommended for any application where the temperature is below 500 F (260 C). Lee Spring Belleville Washers are offered in a wide range of diameters and bolt sizes. Belleville Washers can be stacked in series, parallel, or a combination of both to achieve varying loads and height. Belleville Washers can be used in 4 different ways: A single Belleville Washer has a specific load for a given deflection. Two washers stacked in parallel will yield double the load of a single washer for the same deflection; three washers will yield triple the load; four washers will yield four times the load, etc. Alternatively, two washers stacked in series will yield double the deflection of a single washer for the same load; three washers will yield triple the deflection; four washers will yield four times the deflection, etc. Various series-parallel combinations therefore can provide a wide variety of combined results of load versus deflection for the stack. Consequently, depending on the application, the designer can: Stack in parallel to increase the load. Stack in series to increase the deflection Adjust the load and deflection of a washer stack by adding or removing individual washers and/or the sequence in which they are used, whether in series or parallel. Lee Spring can manufacture custom Belleville spring washers to your specifications. Contact us today! 205
2 Deflection In % of h Load In % of Load at Flat Position Deflection In % of h Flat Position Load In % of Load at Flat Position Lee Spring Belleville Washer part numbers reflect three of the key measurement parameters. As shown in the diagram below the washer part number is configured as follows: Washer Part Number Measurement Parameters ID t OD t OD ID Ho SELECTING BELLEVILLE WASHERS h ID t OD Ho h Pmax Represents the washer inside diameter. This is a minimum measurement and reflects the bolt size that the washer will accommodate. Represents the washer material thickness as well as the washer solid (flat) height. Represents the washer outside diameter. This outside diameter is the maximum outside diameter as supplied and prior to loading. OTHER IMPORTANT CONSIDERATIONS ARE: Overall Height, unloaded h = Ho t Load at flat (the load at full compression) In order to obtain intermediate loads for Belleville Washers, you can use the Load-Deflection diagram above. 206
3 Belleville Spring Washer Series Guide to using tables Lee Stock Number: Lee Spring Part Number Inside Diameter (ID): Nominal hole size of washer's inside. Thickness (t): Material thickness. Calculated Load at Flat (Pmax): Load when the spring washer is fully compressed. Price Group: Reference for price list. See fold-out section at rear of book W W / W W W W W Bolt Size: Suggested maximum bolt size to guide the inside of the washer. Additional Information Outside Diameter (OD): Nominal outside diameter of the washer. If used in a containment hole the hole must be greater than this dimension. Belleville Washers manufactured from Type 300 Stainless Steel with passivated finish in accordance with ASTM A967. To minimize friction and optimize load, ensure stack of springs are guided over a rod or within a bore or cylinder. Overall Height Unloaded (Ho): The height of the washer in the unloaded position. How to Determine Price 1. Select the spring you want by LEE STOCK NUMBER. 2. Read across to the last column PRICE GROUP to obtain the price code: when applicable, select the price code that corresponds to the material type required. 3. Refer to the PRICE GROUP in the appropriate pricing chart by spring type located in the back of this catalog for pricing up to 199 pieces of an item. 4. Prices subject to change without notice. FREE SHIPPING AVAILABLE See Price List in back of catalog for details. 207
4 W W / W W W2 Single Disk Parallel Series Series Parallel W W / W W W W W W # W W W W W # W W W W / W W W W W W W # W W W W W W W W W / W W W W W W3 SPECIAL INSTRUCTIONS FOR 208
5 W W W # W W W W # W W W / W W W W W / W W W W W W / W W W W W W / W W W W W W W / W W W11 SPECIAL INSTRUCTIONS FOR 209
6 Single Disk Parallel Series Series Parallel W W W W W / W W W W W W W W W W W / W W W W W / W W W W W W W W W W / W W W W W W W W W W W W W / W W W W W14 SPECIAL INSTRUCTIONS FOR 210
7 W W W W W W / W W W W W W W / W W W W W W W W W W W W W W W W W / W W W W W W W W W W W W W W W W W32 SPECIAL INSTRUCTIONS FOR 211
8 Single Disk Parallel Series Series Parallel W W W W / W W W W W W W / W W / W W W W W W W / W W W W W W W W / W W W W W / W W W W W W W W / W W W W W35 SPECIAL INSTRUCTIONS FOR 212
9 W / W W W W W W W W W W W / W / W W / W W39 1 1/ W / W W / W / W W38 SPECIAL INSTRUCTIONS FOR 213
10 NOTES 214
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