Specialized head diameter provide for a tighter fit in countersunk holes
Head design will fit into all applications designed for # 3 Heads.
Deeper depth of square provides fuller engagement.
Smaller transition angle on the corners of the square provides for a greater resistance against spinning in the hole during installation.
Tighter tolerance on the body diameter for sizes 5/8 and larger, minimizes the potential of the bolt moving in the hole, which can result in the assembly coming loose and causing rounding out of the installation holes.
Two strength levels are available (depending on size and availability):
Grade 5 (per SAE J429) - 120,000 psi minimum Tensile Strength Standard Duty, Good Strength to Toughness Ratio
Grade 8 (per SAE J429) - 150,000 psi minimum Tensile Strength Heavy Duty, Best Strength to Toughness Ratio
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