Belleville Washer Minimum Torque

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.

Belleville washer minimum torque.

Again belleville washers are no exception. G f ratio of yield point. Forces are decreased as m ore washers are used in series since some of the contact. 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.

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 is also known as preload or initial load in tension on bolt. Torque is the rotational force applied to a bolt to tighten a belleville disc spring. The belleville washer can then be added seamlessly and no modification to this torque value is needed.

Clamp load lb is calculated by arbitrarily assuming. 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. Supply part number. D nominal bolt diameter.

Torque tension reference guide printed in u s a. So that the bolt and belleville washers work together make sure the torque for your belleville washers matches that of your bolts. μ th thread friction coefficient μ h under head friction coefficient 1 n 0 225 lb 1 nm 0 738 ft lb. 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.

Cu c paste copper graphite paste molykote 1000 oil wd40 has been used. Thread friction coefficients have theoretical values. Higher loads than f w. If you exceed a locking washer s torque by more than a few percent during assembly you destroy the locking washer.

When tightening according to guidelines and with no deviation this is the pre stress achieved expressed as of yield point. Tightening torque values are calculated from the formula t kdp where t tightening torque. 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. Flat load is the amount of axial force required to flatten a belleville disc spring.

Flat loading a belleville disc spring helps to ensure that bolts do not loosen while machinery is in use. This is the same with belleville washers.