The Grade 8.8 black oxide full-thread hexagon socket bolts have an internal hex design and needs to be used with a wrench with a hex head. Its full thread design makes the bolts easier to install and tighten. The surface of the bolt has been oxidized and blackened, and its strength meets the 8.8 strength requirements and can be used in some projects with higher performance and appearance requirements. We provide customized services for the hex Bolts size, shape, appearance, grade, surface treatment, etc. Please feel free to contact us if you need it.
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