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Whitworth Bolt Torques

Torque specifications Whitworth bolts.

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Whitworth bolt torque specifications:

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

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km
in
ft
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naut miles


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m2
km2
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ft2
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acres


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Volume

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liters
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ft3
us gal


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kgf
N
lbf


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ft/min
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mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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m3/h
US gpm
cfm


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