The Ultimate Buyer's Guide for Purchasing Hex Bolt Supplier

Feb. 24, 2025

A Complete Guide to Hex Bolts

Bolts Buying Guide at Menards®

Bolt Grade Markings The most common grading system used for bolts in the US is the SAE system, but you can find metric grading systems as well. There are several grades of bolts, but the three most common grades for SAE are Grade 2/A307, Grade 5, and Grade 8. The common class (grades) for metric are 8.8, 10.9, and 12.9. Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher the number means the stronger the bolt. For most home and automotive applications, you won't need anything more than a Grade 8 bolt strength or metric class 10.9. Grade 2 and A307 fasteners are very similar and in most cases are interchangeable with one another. Both are often referred to as 'low carbon' fasteners. The difference in the two is that Grade 2 bolts are manufactured to SAE J429, which is an automotive specification, while A307 are manufactured to ASTM specifications, which are industrial specifications.

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