Belleville Washer Minimum Torque

A belleville washer also known as a coned disc spring conical spring washer disc spring belleville spring or cupped spring washer is a conical shell which can be loaded along its axis either statically or dynamically.

Belleville washer minimum torque.

Torque is the rotational force applied to a bolt to tighten a belleville disc spring. So that the bolt and belleville washers work together make sure the torque for your belleville washers matches that of your bolts. The belleville washer can then be added seamlessly and no modification to this torque value is needed. Supply part number.

These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws. Thread friction coefficients have theoretical values. D nominal bolt diameter. μ th thread friction coefficient μ h under head friction coefficient 1 n 0 225 lb 1 nm 0 738 ft lb.

Clamp load is also known as preload or initial load in tension on bolt. Flat loading a belleville disc spring helps to ensure that bolts do not loosen while machinery is in use. Flat load is the amount of axial force required to flatten a belleville disc spring. Torque tension reference guide printed in u s a.

Clamp load lb is calculated by arbitrarily assuming. When tightening according to guidelines and with no deviation this is the pre stress achieved expressed as of yield point. 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. Cu c paste copper graphite paste molykote 1000 oil wd40 has been used.

Again belleville washers are no exception. Belleville spring lock washers also known as conical washers these have a slightly cupped shape that gives them spring like flexibility to grip tighter than split and tooth lock washers. If you exceed a locking washer s torque by more than a few percent during assembly you destroy the locking washer. Tightening torque values are calculated from the formula t kdp where t tightening torque.

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. This is the same with belleville washers. The belleville will be in its flat position when the preload in the bolt equals the flat load1 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. And p bolt clamp load developed by tightening.

G f ratio of yield point. Higher loads than f w.