5/16"-18 x 4" (USS) GRADE-8 ALLOY HEX HEAD CAP SCREW, Zinc Yellow (50-PACK)

Grade 8 (USS) Hex Head Cap Screws, Zinc Yellow

* Thread Pitch: 5/16"-18

* For your toughest fastening applications, always use (CT) Grade-8 Fastening Systems.

* Ultra-Gold Plating provides the extra corrosion protection, not found using zinc plated product.

* (CT) Grade-8 Cap Screws comply with SAE J429, ANSI/ASME B18.2.1 (U.S.A.) Fastener Standards.

* Medium Carbon Alloy Steel Tensile, 150,000psi Minimum Hardness.

* Rockwell Hardness C33-C39, Threads: Unc and Unf Radius Root Class 2A To Ansi/Asme b1.1 Classification.

* Tempering Temperature 800°F (Minimum) Decarburization:

* Meets SAE J121, Discontinuities: Meet: SAE J1061 Specifications.

* Diameter plus 1/4" for Thread length. Lengths over 6": Diameter x 2-1/2" For Thread Length.