Half-Height Nuts

[Christopher R.]

I'm reading my 1962 Judging Guide the other night, and on page 175 I find that the ground straps are attached to the exhaust pipe hangers on top of the existing nut with a "half-height" nut. There's a nice picture, so I now know what it is. I'd never seen one or even heard of one before.

Does anybody know where I can get them?

[Gary B.]

Re: Half-Height Nuts

Chris,

They sound like standard jam nuts, which are about half as thick as regular nuts. Here's a description:

http://www.fastenermart.com/jam-nuts.html

Gary

[Christopher R.]

Re: Half-Height Nuts

Thank you Gary. Looking through the AIM, I believe that they are p/n 124920. Section 8.900 of the Parts Manual describes this part as a cadmium plated 5/16-24 jam nut.

Anybody know where I can find that size? I'm guessing my friendly local hardware store won't carry it. Is that size used for anything else? Also need a 5/16 external tooth lock washer to go under this nut.

[Gary B.]

Re: Half-Height Nuts

Chris,

McMaster-Carr has zinc plated jam nuts in that size for about $5.30 per hundred, plus S&H, but their minimum order will likely be a killer. Your local hardware store might indeed have them. Cad plated ones will be much harder to find.

Gary

[Gary B.]

Re: Half-Height Nuts

Chris,

What's the part number for the external tooth washer?

Gary

[Joe R.]

Re: Half-Height Nuts

Chris,

McMaster-Carr has zinc plated jam nuts in that size for about $5.30 per hundred, plus S&H, but their minimum order will likely be a killer. Your local hardware store might indeed have them. Cad plated ones will be much harder to find.

Gary

Hi Gary,

I'm pretty sure there is no minimum order with McMaster-Carr. I've placed several small orders with them.

Joe

[Gene M.]

Re: Half-Height Nuts

There are many, many suppliers for jam nuts and star washers on the interweb.

[Christopher R.]

Re: Half-Height Nuts

Chris,

What's the part number for the external tooth washer?

Gary

The p/n for the external tooth lock washer is listed in my AIM as 178537.

I found the lock washers today at my local Home Depot, both in stainless and in zinc plated. Home Depot also had 5/16 jam nuts. But only in coarse threads. Not in fine.

[Stephen L.]

Re: Half-Height Nuts

Try this website for fasteners... huge selection!!

http://www.auveco.com/product/index.html

[Gary B.]

Re: Half-Height Nuts

Chris,

GM still sells toothed washer, GM # 178537.

Gary

[Joe L.]

Re: Half-Height Nuts

Chris,

GM still sells toothed washer, GM # 178537.

Gary

Gary------


It's now discontinued. There might still be some of them around, though.

[Nicholas L.]

Re: Half-Height Nuts

Here is another Corvette fastener website.

http://www.corvettefasteners.com/pages/About-Us.html