Perfect for High-Torque or critical applications, our certified, lot-tested, 180,000 psi tensile strength, USA Made, Super Grade 8 Hex Head, SAE Coarse Thread Cap Screws are significantly stronger and harder than standard 150,000 psi tensile strength Grade 8 bolts.
Super Grade 8 Features and Specifications:
- Made of Super Hi-tensile Quad-Alloy Steel
- Tensile strength: minimum 180,000 psi
- Greater hardness, strength, heat resistance, corrosion resistance, and overall durability than standard Grade 8 cap screws
- Controlled grain flow with washer face
- Double heat treated with 20% higher head
- Cold rolled, Class 2A Threads - machine pointed
- Rockwell hardness: C38-42
- Meets or exceeds SAE J429 and ASTM A354 Grade 8 specifications
- Plated for corrosion resistance
- Manufactured in America with American materials.
- Head Marking Grade Markings for ease of identification.
- Flats are easy to grip and corners resist rounding.
- 20% higher head than standard cap screws makes wrenching easier.
- 15° Top Chamfer higher corners for reduced socket wear.
- Smooth washer face bearing surface permits complete 360° load distribution while maintaining consistent clamping force.
- Smooth fillet radius design to increase fatigue strength and reduce stress concentration where the head and shank meet.
- Excellent elongation properties stretches a min. of 12% in a standard elongation test per J429.
- Concentric shanks for easy, accurate assembly.
- Chamferred points for easy starting and assembly.
- 100% traceable - each lot is laboratory tested to assure consistent quality material test reports available.
- Class 2 UNR threads are cold rolled, precision formed for increased clamping strength, better fit and reduced risk of failure.
- Trailing thread does not enter extrusion angle for increased stress resistance.
