Belleville Washer Minimum Torque

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.

Belleville washer minimum torque.

Flat load is the amount of axial force required to flatten a belleville disc spring. Clamp load is also known as preload or initial load in tension on bolt. G f ratio of yield point. Tightening torque values are calculated from the formula t kdp where t tightening torque.

μ th thread friction coefficient μ h under head friction coefficient 1 n 0 225 lb 1 nm 0 738 ft lb. Flat loading a belleville disc spring helps to ensure that bolts do not loosen while machinery is in use. The belleville washer can then be added seamlessly and no modification to this torque value is needed. Supply part number.

Forces are decreased as m ore washers are used in series since some of the contact. 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. Higher loads than f w. Cu c paste copper graphite paste molykote 1000 oil wd40 has been used.

This is the same with belleville washers. 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. D nominal bolt diameter. A belleville washer is a type of spring shaped like a washer it is the frusto conical shape that gives the washer its characteristic spring.

Again belleville washers are no exception. When tightening according to guidelines and with no deviation this is the pre stress achieved expressed as of yield point. 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. If you exceed a locking washer s torque by more than a few percent during assembly you destroy the locking washer.

So that the bolt and belleville washers work together make sure the torque for your belleville washers matches that of your bolts. These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws. Torque tension reference guide printed in u s a. Torque is the rotational force applied to a bolt to tighten a belleville disc spring.

Clamp load lb is calculated by arbitrarily assuming. And p bolt clamp load developed by tightening.