http://www.xgf-hardwares.com/hex-socket-screw/ China Hex Socket Head Screws suppliers Product description: Torx-Plus drives have more contact points than hex drives, allowing you to reduce slippage or damage to the grooves when tightening these screws. With a tensile strength of 170,000 psi, these alloy steel screws are stronger than grade 8 steel screws. Their black oxide finish provides mild corrosion resistance in dry environments. They can be used with Torx-Plus and standard Torx tools (see Torx Bits and Torx Keys and Drivers). Screws meet ASTM A574 specification and material quality testing requirements. The length is measured
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