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Highlights: Size: 3/8X2-1/4 Thread pitch: 3/8-24 UNF Conforms to SAE Grade 5 physical and mechanical specifications Zinc plated for corrosion resistance Pack of 50 Technical Data: Material and Mechanical Properties of SAE J429 Dimensions: ANSI/ASME B18.2.1 Hex Head Cap Screws Tensile: 1/4" - 1" Nominal Diameter 120,000 psi (minimum) over 1" Nominal Diameter 105,000 psi (minimum) Proof Load: 1/4" - 1" Nominal Diameter 85,000 psi; over 1" Nominal Diameter 74,000 psi Threads: Radius Root Class 2A to ANSI/ASME B1.1 Hardness: 1/4" - 1" Nominal Diameter Rockwell C25-C34; over 1" Nominal Diameter C19-C30 Decarburation: SAE J121 Discontinuities: SAE J1061 For bolts under 6": Twice the bolt diameter plus a 1/4" For bolts over 6": Twice the bolt diameter plus a 1/2" This gives you the approximate bolt thread length available Rule of thumb to figure bolt thread length: For bolts under 6": Twice the bolt diameter plus a 1/4" For bolts over 6": Twice the bolt diameter plus a 1/2" This gives you the approximate bolt thread length available