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They are grade 8 or better! Posted by 900 Aero [Email] ![]() ![]() In Reply to: Re: Studs--turbo to wg housing, elbow, downpipe..., 900 Aero ![]() |
McMaster Carr got back to me today and their Black-Oxide Steel Spacing Studs I use are class 10.9 which is equal to a little better than grade 8 so no wonder they've worked so well for me for turbo and exhaust hardware all these years! Also class 8.8 is equal to US grade 5 and you certainly wouldn't want grade 5 hardware in these applications!
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