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Lock Washer Question ????

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Alberta Mike

04-18-2005 17:27:25

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I'm referring here to what I call "spider" lock washers, the kind with the little gripping fingers around the washer's circumference. First, correct me on the proper name for these. My question is that some of them have the fingers on the inside of the washer hole, others on the outside edge. Have I seen any with fingers on both inside and outside? Why the difference between the inside and outside styles? There's gotta be a reason.

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FarmerDave

04-19-2005 20:32:12

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Re: Lock Washer Question ???? in reply to Alberta Mike, 04-18-2005 17:27:25

I got this campershell on my rig. It's held in place with 4 4/16" bolts. With time the 5/16" holes have becomed wallowed out. I use the external rings because I think there's a better chance of making contact with a metal surface.

Both types are supposed to be better than split ring as a general rule in vibration condions.

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Gerald J.

04-18-2005 20:38:19

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Re: Lock Washer Question ???? in reply to Alberta Mike, 04-18-2005 17:27:25

Originally they were called "Shakeproof" lock washers. Internal ones certainly give a better appearance to an assembly over external with tabs showing.

They are also available for flat head screws, probably no other types are.

They are just a couple options out of many for locking threads these days and are good at making really good electrical contact in spite of paint and crud.

Gerald J.

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riverbend

04-18-2005 20:09:11

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Re: Lock Washer Question ???? in reply to Alberta Mike, 04-18-2005 17:27:25

An electrical designer said that the internal tooth design was to keep a broken tooth from causing a short.

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JPatton

04-18-2005 17:52:43

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Re: Lock Washer Question ???? in reply to Alberta Mike, 04-18-2005 17:27:25

Rod - In the auto industry, we commonly use these toothed washers for electrical grounds. The teeth cut into painted or coated surfaces better that the normal split ring type.

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Rod (NH)

04-18-2005 17:45:45

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Re: Lock Washer Question ???? in reply to Alberta Mike, 04-18-2005 17:27:25

Hi Mike,

According to ASME/ASA B18.2-1962, Glossary of Terms for Mechanical Fasteners, they are called "external tooth", "internal tooth", and "internal-external tooth" lock washers. Yes, all three versions exist. I have no idea why you would choose one over the other two. I can only guess that they might have increasing "locking power" as the number of "fingers" or prongs increase. That would make the internal tooth version the lowest and the internal-external version the highest as far as locking ability goes.

Rod

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