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Grade 8.8 Hex Socket Bolt supplies

Commonly used hex socket head cap bolts are grade 4.8, 8.8, 10.9, 12.9, etc. Usually, the hex socket bolts of grade 8.8 and above are called high-strength Allen bolts, of which the hex socket bolts screws of grade 12.9 have knurling. The hexagon socket head cap bolts below grade 8.8 are called ordinary hex socket bolts.

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