Outer hex screws and inner hex screws are both fasteners that used in machinery, mainly for fastening, disassembly, not easy slip Angle and other advantages, also , the length can be customized according to defference condition.

What's the difference?

1. Inner hexagonal bolts are round on the outside and concave hexagonal on the middle, and outer hexagonal screws are the regular hexagonal sides of the heads.

2. The using tool is difference too.

Outer hexagonal screws use external hexagon wrench

Inner hexagonal bolts use Hexagonal socket wrench.

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