#829500

Diameter Thread Threads Length Grade Finish Weight
0.5000 (1/2) Partial 13 1.5000 (1 1/2) GR B Plain Finish 0.1280
Diameter 0.5000 (1/2)
Thread 13
Length 1.5000 (1 1/2)
Grade GR B
Finish Plain Finish
Weight 0.1280

  • GR B
  • Alloy Steel


Earnests line of Heavy Hex Bolts, per ASTM A307 Grade B are designed to ensure the clamp loads developed in assembly are distributed over a larger area than the standard hex heads. They also provide a larger wrenching area to resist rounding out of the head. A307 Grade B Heavy Hex Bolts are commonly used in applications where the bolt strength needs to be controlled — meaning the bolt will break before equipment is destroyed.

Heavy Hex Bolt – A307 Grade B

  • Minimum (60,000 psi) and maximum (100,000 psi) tensile strength
  • Used in applications where the bolt strength needs to be controlled
  • Width across the hex head is larger, distributing the pressure across a wider area
  • Larger wrenching area to resist rounding out of the head
  • Rockwell hardness of Rb 69/95
  • We recommend the use of Grade 2 (carbon steel) heavy nuts and USS carbon steel washers with A307 bolts
  • Diameter sizes range from 1/4" to 1 1/2
  • Based on ASME B18.2.1 dimensional standards
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