Belleville Washer Torque Specs

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

Belleville washer torque specs.

Belleville international manufactures belleville disc springs and spring washers. Clamp load lb is calculated by arbitrarily assuming. 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.

Clamp load is also known as preload or initial load in tension on bolt. This is the same with belleville washers. Ultimately though the answer comes from the sealing load needed on the gasket not from the belleville washer. American belleville washers hold your bolted joint tight in the face of the most extreme cases of differential thermal expansion contraction bolt creep and vibration that threaten the integrity of the joint.

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. Home products belleville washers. Higher loads than f w. Performance considerations a similar device is a wave washer.

1 spring is considered to be 1 in parallel 1 in series. Torque is the rotational force applied to a bolt to tighten a belleville disc spring. 5500 lbf belleville washer as supplied by sefcor. Flat load is the amount of axial force required to flatten a belleville disc spring.

Forces are decreased as m ore washers are used in series since some of the contact. This notation is needed for load calculations if n of springs in a stack then. So that the bolt and belleville washers work together make sure the torque for your belleville washers matches that of your bolts. In lb ft lb n m in lb ft lb n m 1 2 540 45 61 660 55 75.

D nominal bolt diameter. Silicon bronze hardware is not lubricated. The values assume the following in addition to the information listed in the chart. Tightening torque values are calculated from the formula t kdp where t tightening torque.

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. Torque is a rotational force which when applied to a bolt is converted to an axial load stretching the bolt like a spring. To better understand this we need to understand torque and its relationship to a bolted system. All stainless steel hardware stainless steel hardware with bronze nut dia.

Belleville washer stacking example. We utilize quality spring steels including carbon alloy tool grade specialty stainless nickel alloys titanium alloys and more.