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Highlights: Size: 3/4X1-3/4 Thread pitch: 3/4-16 UNF Material: Medium Carbon Alloy Steel For your toughest fastening applications, use Grade 8 fasteners every time Grade 8 Cap Screws comply with SAE J429, ANSI/ASME B18.2.1 hex cap screws Imperial's zinc; yellow dichromate plating provides the extra corrosion protection not found in regular zinc plating For maximum holding power, always use a balanced assembly of Grade 8 components; cap screw, hex nut, flat washer, lock washer Technical Data: Tensile: 150,000 psi minimum Hardness: Rockwell Hardness C33-C39 Tempering Temperature: 800 F. (minimum) Finish: Zinc; Yellow Dichromate ASTM B633, Type II SC1 Threads: UNRF and UNRC Radius Root Class 2A to ANSI/ASME B1.1 Decarburization: Meets SAE J121 Discontinuities: Meets SAE J1061 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