Belleville Washer Minimum Torque

G f ratio of yield point.

Belleville washer minimum torque.

And p bolt clamp load developed by tightening. 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. When tightening according to guidelines and with no deviation this is the pre stress achieved expressed as of yield point.

Torque tension reference guide printed in u s a. 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. Flat loading a belleville disc spring helps to ensure that bolts do not loosen while machinery is in use. Cu c paste copper graphite paste molykote 1000 oil wd40 has been used.

μ th thread friction coefficient μ h under head friction coefficient 1 n 0 225 lb 1 nm 0 738 ft lb. 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. These washers have smaller outside diameters than standard spring lock washers to fit neatly under socket head cap screws. Torque is the rotational force applied to a bolt to tighten a belleville disc spring.

Flat load is the amount of axial force required to flatten a belleville disc spring. In threads per inch 307a astm a307 grade a sae j429 grade 5 sae j429 grade 8 f n l g 9 fnl grade 9 clamp load lbs tightening. 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. Thread friction coefficients have theoretical values.

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. The belleville washer can then be added seamlessly and no modification to this torque value is needed. Higher loads than f w. Forces are decreased as m ore washers are used in series since some of the contact.

Tightening torque values are calculated from the formula t kdp where t tightening torque. Again belleville washers are no exception. D nominal bolt diameter. 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 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. Clamp load lb is calculated by arbitrarily assuming.