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lockwasher

lockwasher

lockwasher

(OP)
Does including a split lockwasher in a joint require more torque than if I used a flat washer?  A vendor we deal with claims that a joint with a split lockwasher under a cap screw head (tapped hole) can require up to 3-4 times the torque of the same joint with a flat washer.  Is that possible?  Also, am I right in assuming that the lockwasher acts like just another joint material, with a different spring constant, as you're tightening the joint?  

RE: lockwasher

Quote:

A vendor we deal with claims that a joint with a split lockwasher under a cap screw head (tapped hole) can require up to 3-4 times the torque of the same joint with a flat washer.  Is that possible?
Short answer: no, he's nuts.  
Long answer: The friction coefficient will be roughly the same between a flat and split washer, thus there is no significant difference between the two when it comes to torque.

Quote:

Also, am I right in assuming that the lockwasher acts like just another joint material, with a different spring constant, as you're tightening the joint?
Yes, you're correct, though I don't think there's much difference in spring constant.  I'd suggest you ignore the difference in diameter between the washer and split washer.  The extra material on a washer is not loaded in compression.

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