What type of screws are that? - The Supercar Registry

06-05-2009, 09:15 AM

rubbinisracing rubbinisracing is offline

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Re: What type of screws are that?

The 3 radial lines on the head indictate a SAE J-429 grade of 5.1. You're correct about the SS being the manufacturers head mark. The IFI or Industrial Fastener Institute logs those markings and sells the list to members. I have one somewhere but can find it.

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