SECTION 1 - GENERAL INFORMATION
1-11
STANDARD TORQUE FOR DRY, ZINC
PLATED, AND STEEL FASTENERS (INCH
SERIES)
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 oil, graphite, or thread sealant
such as Loctite.
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:
The nominal torque values listed above for
Grade 5 and 8 fasteners are based on 75% of the
minimum proof load specified in SAE J429. The
tolerance is approximately ± 10% of the nominal
torque value. Thin height nuts include jam nuts.
THREAD
SIZE
GRADE 1,
5, & 8 WITH
THIN
HEIGHT
NUTS
SAE GRADE 1 BOLTS,
SCREWS, STUDS, &
SEMS WITH REGULAR
HEIGHT NUTS (SAE
J995 GRADE 2 OR
STRONGER NUTS)
SAE GRADE 5
BOLTS, SCREWS,
STUDS, & SEMS WITH
REGULAR HEIGHT
NUTS (SAE J995
GRADE 2 OR
STRONGER NUTS
SAE GRADE 8
BOLTS, SCREWS,
STUDS, & SEMS
WITH REGULAR
HEIGHT NUTS (SAE
J995 GRADE 2 OR
STRONGER NUTS
In-lb
In-lb
N-cm
In-lb
N-cm
In-lb
N-cm
# 6 - 32 UNC
10 ± 2
13 ± 2
147 ± 23
15 ± 2
170 ± 20
23 ± 2
260 ± 20
# 6 - 40 UNF
17 ± 2
190 ± 20
25 ± 2
280 ± 20
# 8 - 32 UNC
13 ± 2
25 ± 2
282 ± 30
29 ± 3
330 ± 30
41 ± 4
460 ± 45
# 8 -36 UNF
31 ± 3
350 ± 30
43 ± 4
31 ± 3
# 10 - 24 UNC
18 ± 2
30 ± 5
339 ± 56
42 ± 4
475 ± 45
60 ± 6
674 ± 70
# 10 - 32 UNF
48 ± 4
540 ± 45
68 ± 6
765 ± 70
1/4 - 20 UNC
48 ± 7
53 ± 7
599 ± 79
100 ± 10
1125 ± 100 140 ± 15 1580 ± 170
1/4 - 28 UNF
53 ± 7
65 ± 10
734 ± 113
115 ± 10
1300 ± 100 160 ± 15 1800 ± 170
5/16 - 18 UNC
115 ± 15
105 ± 17
1186 ± 169 200 ± 25
2250 ± 280 300 ± 30 3390 ± 340
5/16 - 24 UNF
138 ± 17
128 ± 17
1446 ± 192 225 ± 25
2540 ± 280 325 ± 30 3670 ± 340
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 ± 4
58 ± 5
3/8 - 24 UNF
17 ± 2
18 ± 2
24 ± 3
35 ± 3
47 ± 4
50 ± 4
68 ± 5
7/16 - 14 UNC
27 ± 3
27 ± 3
37 ± 4
50 ± 5
68 ± 7
70 ± 7
68 ± 9
7/16 - 20 UNF
29 ± 3
29 ± 3
39 ± 4
55 ± 5
75 ± 7
77 ± 7
104 ± 9
1/2 - 13 UNC
30 ± 3
48 ± 7
65 ± 9
75 ± 8
102 ± 11
105 ± 10
142 ± 14
1/2 - 20 UNF
32 ± 3
53 ± 7
72 ± 9
85 ± 8
115 ± 11
120 ± 10
163 ± 14
5/8 - 11 UNC
65 ± 10
88 ± 12
119 ± 16
150 ± 15
203 ± 20
210 ± 20
285 ± 27
5/8 - 18 UNF
75 ± 10
95 ± 15
129 ± 20
170 ± 15
230 ± 20
240 ± 20
325 ± 27
3/4 - 10 UNC
93 ± 12
140 ± 20
190 ± 27
265 ± 25
359 ± 34
374 ± 35
508 ± 47
3/4 - 16 UNF
115 ± 15
165 ± 25
224 ± 34
300 ± 25
407 ± 34
420 ± 35
569 ± 47
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 ± 45
644 ± 61
660 ± 60
895 ± 81
