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.

Clamp load lb is calculated by arbitrarily assuming. All stainless steel hardware stainless steel hardware with bronze nut dia. Home products belleville washers. If you exceed a locking washer s torque by more than a few percent during assembly you destroy the locking washer.

Ultimately though the answer comes from the sealing load needed on the gasket not from the belleville washer. Again belleville washers are no exception. This is the same with belleville washers. The values assume the following in addition to the information listed in the chart.

Performance considerations a similar device is a wave washer. In lb ft lb n m in lb ft lb n m 1 2 540 45 61 660 55 75. 5500 lbf belleville washer as supplied by sefcor. 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 the rotational force applied to a bolt to tighten a belleville disc spring. D nominal bolt diameter. 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. This notation is needed for load calculations if n of springs in a stack then.

Belleville washer stacking example. To better understand this we need to understand torque and its relationship to a bolted system. 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. Higher loads than f w.

Forces are decreased as m ore washers are used in series since some of the contact. And p bolt clamp load developed by tightening. Belleville international manufactures belleville disc springs and spring washers. Silicon bronze hardware is not lubricated.

We utilize quality spring steels including carbon alloy tool grade specialty stainless nickel alloys titanium alloys and more. Tightening torque values are calculated from the formula t kdp where t tightening torque. Flat load is the amount of axial force required to flatten a belleville disc spring. We specialize in high temperature applications and the most corrosive environments where first rate quality is.

1 spring is considered to be 1 in parallel 1 in series. So that the bolt and belleville washers work together make sure the torque for your belleville washers matches that of your bolts.