Imperial 17205 Sae Hex Head Cap Screw, Grade 8, 1/2×3-1/4 Discount Reliable

Highlights:

• Size: 1/2×3-1/4
• Thread pitch: 1/2-20 UNF
• Grade 8 SAE Hex Head Cap Screw
• 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
• For maximum holding power, always use a balanced assembly of Grade 8 components; cap screw, hex nut, flat washer, lock washer
• Imperial’s zinc; yellow dichromate plating provides the extra corrosion protection not found in regular zinc plating

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