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DESCRIPTION

Highlights:

• Size: 5/8X2 3/4
• Thread pitch: 5/8-18 UNF
• 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:

• Material: Medium Carbon Alloy Steel
• Tensile: 150,000 psi minimum
• Hardness: Rockwell Hardness C33-C39
• Tempering Temperature: 800° F. (minimum)
• Decarburization: Meets SAE J121
• Discontinuities: Meets SAE J1061
• Finish: Zinc; Yellow Dichromate ASTM B633, Type II SC1
• Threads: UNRF and UNRC Radius Root Class 2A to ANSI/ASME B1.1

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