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yup.... they are normally harder than a standard bolt, the standard is Class 8.8 wich would be about a grade 3ish... sounds like grade 8 but isn't!! Up to class 12.9 that's around a grade 8.
As for bumpers and most fastners on my Jeep, everytime I have needed to replace a bolt i just bought a grade 8 replacement, gotta love that finish
Can't go wrong with Grade 8 Bolts nuts and washer. That is what is holding on my bumper winch and hooks. They have been there for the past 6 years and has seen plenty of rough service.
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