Should you have any additional questions our engineering team here at belleville international is available for your convenience and can be reached by calling 877 235 5384.
Belleville washer torque table.
Belleville washers are a more economical and less precise form of conical disc spring best used for static applications where some setting and or loss of force can be tolerated.
D nominal bolt diameter.
All stainless steel hardware stainless steel hardware with bronze nut dia.
μ th thread friction coefficient μ h under head friction coefficient 1 n 0 225 lb 1 nm 0 738 ft lb.
Belleville washers manufactured from steel strip are not scragged pre stressed during the manufacturing process and the inside and outside diameters of the disc.
The belleville will be in its flat position when the preload in the bolt equals the flat load 1 since the spring will be clamped between the flat joint an d the nut any additional torque applied to the nut will only stretch the bolt.
Thread friction coefficients have theoretical values.
Cu c paste copper graphite paste molykote 1000 oil wd40 has been used.
Calculation example multiple belleville washers may be stacked to modify the spring constant or amount of.
Torque calculation the widely accepted formula is as follows t k f d where k estimated nut friction factor t bolt torque d nominal bolt diameter.
Clamp load lb is calculated by arbitrarily assuming.
Lee spring also expand on size options past din 2093 s standard size tables made to din manufacturing and quality specifications to provide component flexibility for product designers.
Silicon bronze hardware is not lubricated.
When tightening according to guidelines and with no deviation this is the pre stress achieved expressed as of yield point.
The values assume the following in addition to the information listed in the chart.
This is the same with belleville washers.
If you exceed a locking washer s torque by more than a few percent during assembly you destroy the locking washer.
Performance considerations a similar device is a wave washer.
Again belleville washers are no exception.
And p bolt clamp load developed by tightening.
Belleville washer stacking example.
G f ratio of yield point.
In lb ft lb n m in lb ft lb n m 1 2 540 45 61 660 55 75.
1 spring is considered to be 1 in parallel 1 in series.
This notation is needed for load calculations if n of springs in a stack then.
Clamp load is also known as preload or initial load in tension on bolt.
Tightening torque values are calculated from the formula t kdp where t tightening torque.
5500 lbf belleville washer as supplied by sefcor.
