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Standard Torque for Dry, Zinc Plated and Steel Fasteners (Inch Series)
Grade 1, 5 & SAE Grade 1 Bolts, Screws, Studs & SAE Grade 5 Bolts, Screws, Studs & SAE Grade 8 Bolts, Screws, Studs &
Thread Size
8 with Thin Sems** with Regular Height Nuts Sems** with Regular Height Nuts Sems** with Regular Height Nuts
Height Nuts (SAE J995 Grade 2 or Stronger Nuts) (SAE J995 Grade 2 or Stronger Nuts) (SAE J995 Grade 5 or Stronger Nuts)
in–lb in–lb N–cm in–lb N–cm in–lb N–cm
# 6 – 32 UNC 15 + 2 169 + 23 23 + 3 262 + 34
# 6 – 40 UNF
10 + 2
10 + 2
13 + 2
13 + 2
147 + 23
147 + 23
17 + 2 192 + 23 25 + 3 282 + 34
# 8 – 32 UNC 29 + 3 328 + 34 41 + 5 463 + 56
# 8 – 36 UNF
13 + 2
13 + 2
25 + 5
25 + 5
282 + 56
282 + 56
31 + 4 350 + 45 43 + 5 486 + 56
# 10 – 24 UNC 42 + 5 475 + 56 60 + 6 678 + 68
# 10 – 32 UNF
18 + 2
18 + 2
30 + 5
30 + 5
339 + 56
339 + 56
48 + 5 542 + 56 68 + 7 768 + 79
1/4 – 20 UNC 48 + 7 53 + 7 599 + 79 100 + 10 1130 + 113 140 + 15 1582 + 169
1/4 – 28 UNF 53 + 7 65 + 10 734 + 113 115 + 12 1299 + 136 160 + 17 1808 + 192
5/16 – 18 UNC 115 + 15 105 + 15 1186 + 169 200 + 25 2260 + 282 300 + 30 3390 + 339
5/16 – 24 UNF 138 + 17 128 + 17 1446 + 192 225 + 25 2542 + 282 325 + 33 3672 + 373
ft–lb ft–lb N–m ft–lb N–m ft–lb N–m
3/8 – 16 UNC 16 + 2 16 + 2 22 + 3 30 + 3 41 + 4 43 + 5 58 + 7
3/8 – 24 UNF 17 + 2 18 + 2 24 + 3 35 + 4 47 + 5 50 + 6 68 + 8
7/16 – 14 UNC 27 + 3 27 + 3 37 + 4 50 + 5 68 + 7 70 + 7 95 + 9
7/16 – 20 UNF 29 + 3 29 + 3 39 + 4 55 + 6 75 + 8 77 + 8 104 + 11
1/2 – 13 UNC 30 + 3 48 + 7 65 + 9 75 + 8 102 + 11 105 + 11 142 + 15
1/2 – 20 UNF 32 + 4 53 + 7 72 + 9 85 + 9 115 + 12 120 + 12 163 + 16
5/8 – 11 UNC 65 + 10 88 + 12 119 + 16 150 + 15 203 + 20 210 + 21 285 + 28
5/8 – 18 UNF 75 + 10 95 + 15 129 + 20 170 + 18 230 + 24 240 + 24 325 + 33
3/4 – 10 UNC 93 + 12 140 + 20 190 + 27 265 + 27 359 + 37 375 + 38 508 + 52
3/4 – 16 UNF 115 + 15 165 + 25 224 + 34 300 + 30 407 + 41 420 + 43 569 + 58
7/8 – 9 UNC 140 + 20 225 + 25 305 + 34 430 + 45 583 + 61 600 + 60 813 + 81
7/8 – 14 UNF 155 + 25 260 + 30 353 + 41 475 + 48 644 + 65 667 + 66 904 + 89
** A Sems screw is a self–tapping screw equipped with
a captive washer.
NOTE: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
NOTE: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
engine oil or thread sealant such as Loctite.
NOTE: The nominal torque values listed above for
Grade 5 and 8 fasteners are based on 75% of the mini
-
mum proof load specified in SAE J429. The tolerance is
approximately +
10% of the nominal torque value. Thin
height nuts include jam nuts.
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