"Hi Hat" Screw?

[Mike R.]

The front of the S tube on a 1965 FI aircleaner assembly is supposed to attach to the radiator support with 4 Hi-Hat screws. What does a Hi Hat screw head look like? Does anyone have a photo of one either installed or by itself? Thanks

Mike

[Rich P.]

Re: "Hi Hat" Screw?

Mike,

here you go. 1/4" hex head High Hat screw.

Rich

[Jack H.]

Re: "Hi Hat" Screw?

Good pix! I've seen different tip styles on used originals as well as different head marks (double anchor, 'A', plain). So, there were multiple suppliers for this fastener...

[Gary J.]

Re: "Hi Hat" Screw?

I'm not sure of all the applications that this screw was for, but do know that I found some on the last '66 that I restored. I also notice that in the '66 AIM that these screws are used on the AC ducting system.

[Mike R.]

Re: "Hi Hat" Screw?

Thanks, I have seen these before. In addition to the S tube, where are they used? What is a good online source of midyear corvette hardware that has good quality photos on their site or in thier catalog?

This is my first time on this forum and I am amazed at the quick responses

I just purchased a 65 FI roadster and am making everything work correctly (parking brake, windshild washers etc), stoping some minor oil seeps and replacing/refinishing worn and ugly parts (seat belt cables, seat belt latches, a few hose clamps, screws ect.).

Thanks again!

Mike

[Rich P.]

Re: "Hi Hat" Screw?

Mike,

you won't get a correct repro of this bolt. If you look on your heater control cables to heater box. you might find some there or sometimes used as a ground wire bolt. I have many different ones of theis example. You could go junkyarding and look under the dash of a 60-67 GM car your sure to find some. They also pop up on e-bay every once in awhile. I have't listed a set in a few months.


Rich

[Jack H.]

Re: "Hi Hat" Screw?

I think some make the mistake of using the PN listed in the AIM to 'define' the high hat screw and then look for other situations where that PN is called-out. That method doesn't work!

Many of the fastener PN's are simply generic with a plurality of suppliers qualified under that PN with slightly different variation(s) of the basic part. In this case, there was a price/cost penalty associated with the 'high hat' version of the screw. Deciding where/when to use it vs. a lower cost standard profile fastener was most likely a plant by plant and specific application decision.

The attraction of the high hat screw was it tended to stay 'chucked' in a screw gun and not fall out as easily as its standard head profile brothers when the installer had to articulate to reach the installation position. But, there was a price to be paid for this convenience factor!

Walking the scrap yards, these screws DO show up on other GM/Chevy cars but not very frequently. Knowing where/when to look is the trick to harvesting factory correct originals!

[Jack H.]

Re: "Hi Hat" Screw?

"They also pop up on e-bay every once in awhile. I have't listed a set in a few months."

I have and the market has been so 'soft' in the last 6-months that it hasn't been worth the listing fee to offer them...

[Mike R.]

Re: "Hi Hat" Screw?

Mike,

you won't get a correct repro of this bolt. If you look on your heater control cables to heater box. you might find some there or sometimes used as a ground wire bolt. I have many different ones of theis example. You could go junkyarding and look under the dash of a 60-67 GM car your sure to find some. They also pop up on e-bay every once in awhile. I have't listed a set in a few months.


Rich

I guess I will add junkyarding to my list of activities.

[Bob J.]

Re: "Hi Hat" Screw?

I guess I will add junkyarding to my list of activities.

Check out mid to late 60s GM pick up trucks when you go. Bob

[William C.]

Re: "Hi Hat" Screw?

might want to look for something like the attached picture.

[Keith B.]

Re: "Hi Hat" Screw?

http://www.amkproducts.com/bulk3.asp?part=B-11088

[Michael H.]

Re: "Hi Hat" Screw?

http://www.amkproducts.com/bulk3.asp?part=B-11088

I see the screw they list has a 5/16" hex head. I thought originals had a 1/4" hex??

[Rich P.]

Re: "Hi Hat" Screw?

Mike,

I saw that too but from the picture it appears that they misslabled it and it is 1/4" hex.

Rich

[Keith B.]

Re: "Hi Hat" Screw?

I see the screw that list has a 5/16" hex head. I thought originals had a 1/4" hex??

ok that may be the wrong one. but I know they sell them. I bought them to use to restore my 66 Chevelle. I bought some kits they sell and they had them in there. you might want to call them. I bought this G-5687. and they sent me the screw you are looking for