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Whitworth Bolt Torques

Torque specifications Whitworth bolts.

Whitworth bolt torque specifications:

US Wood Screws - Pilot Holes
Bolt Size
(in)
Thread pitch
(1/in)
Torque (lbf ft)
Grade A & BGrade CGrade TGrade V
1/4 20 5 7 9 10
5/16 18 9 15 18 21
3/8 16 15 27 31 36
7/16 14 24 43 51 58
1/2 12 36 64 79 89
9/16 12 52 94 111 128
5/8 11 73 128 155 175
3/4 11 118 213 259 287
7/8 9 186 322 407 459
1 8 276 497 611 693
  • coarse threads
  • standard dry torque
  • Grade A & B - carbon steel - 62720 psi
  • Grade S - carbon steel - 112000 psi
  • Grade T - carbon steel - 123200 psi
  • Grade V - carbon steel - 145600 psi

Whitworth bolt torques

Related Topics

  • Fasteners

    Bolts, nuts and threaded rods - torque, tension and loads.

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