1/2-13x4 Carbon Steel Hook Bolt - J Plain Finish Hardened

#820677

1/2-13x4 Carbon Steel Hook Bolt - J Plain Finish Hardened
Diameter Thread Threads Length Grade Finish Weight
0.5 (1/2) Partial 13 4 (4) Plain Finish .30
Diameter 0.5 (1/2)
Thread 13
Length 4 (4)
Grade
Finish Plain Finish
Weight .30

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Hook Bolts, J-Bolts, or Bent Bolts have two designs used in rock quarries and mines. The J-Bolt Special Bend, otherwise known as Hook Bolt or Shaker Screen Bolt, supports angled ironed shaker screen frames. Resembling a checkmark, the bolt is heat treated to a Rockwell hardness of 25/34 to improve resistance to bending. The other design, the J-Bolt Round Bend, has a rounded radius hook to support tubular shaker screen frames. These bolts shift through dirt and heavy rock — a true testament to their strength.

J Bolt Special Bend – Hardened (Grade 5) or Carbon Steel

  • Available in carbon steel and heat-treated medium carbon steel
  • Heat treatment improves resistance to bending and strength to a Rockwell hardness of 25/34
  • 63-degree bend angle
  • Supports angled ironed shaker screen frames
  • Length tolerance (L): +/- .100”
  • Tolerance for 1 1/4 “ short leg length: +/- .060”
  • Thread length (T): 2.000” min for lengths less than 5”
  • 3.000” min for lengths 5” and longer pitches
  • Tolerance on thread length: + 3 thread pitches
  • Bend angle: +/- 5 degrees
  • Diameter sizes range from 1/2" to 5/8”

    • J Bolt Round Bend – Carbon Steel (Grade 2)

  • Supports tubular shaker screen frames
  • Rounded radius hook
  • Length tolerance (L): +/- .100”.
  • Tolerance for short leg length (A): +/- .060”
  • Thread length (T): 3.500” min for lengths 5” and longer
  • Tolerance on thread length: + 3 thread pitches
  • Diameter sizes range from 1/2” to 5/8”

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