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Page Title:
TIGHTENING TORQUE VALUES FOR STEEL THREADED FASTENERS |
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 Engineering
DATA SHEET 36
Standards
PAGE 1 OF 2
TIGHTENING TORQUE VALUES FOR STEEL THREADED FASTENERS
The following torque values are for use in general applications and where torque values are not otherwise
specified. They are not limited to parts covered by the reference Clark standards, which are examples only,
but apply to all steel screw threaded fasteners having the same strength levels and coated as specified
herein.
TENSILE
COARSE
SCREW OR BOLT NOMINAL THREAD SIZE, INCH
(NUT PROOF)
AND
REF
STRENGTHS,
FINE
CLARK
0.625
0.500
0.5625
0.4375
0.375
0.3125
0.875
0.250
0.750
PSI
TREADED
STDS
[MPa],
FASTENERS
TIGHTENING TORQUE, LB,FT, MAXIMUM * LB.IN
MINIMUM
[N-m] MINIMUM
[N-ml
45
70
28
1C-2C
120 000
90 *
200 *
140
CAP
100
245
360
[38]
[61]
[95]
SCREW,
[10]
[23]
[490]
[135]
[190]
[330]
15C-16C
BOLT
[825]
65
40
80
25
AND
180
220
125
330
[34]
[88]
[54]
610-62D
SAE GRADE 5
NUT
[9]
[21]
[l70]
[170]
[300]
[450]
100
40
65
120 *
240 *
CAP
150 000
17C-18C
140
190
525
330
[135]
[54] [88]
I
SCREW,
[14]
[27]
[190]
[450]
[260]
[710]
23C-24C
BOLT
[1030]
90
60
35
110
AND
215
300
125
175
475
[48] [82]
[125]
NUT
63D-640
SAE GRADE 8
[13]
[24]
[170]
[240]
[410]
[645]
SOCKET
25C-26C
HEAD
75
50
145 *
300 *
120
400
CAP
165
230
650
73G-74G
[68]
160 000
[102]
SCREW
[16]
[34]
[160]
[225]
[310]
[540]
[880]
45
70
110
[1100]
12 POINT
210
600
130
270
150
360
[61]
HEAD
[15]
[31]
[95]
[815]
[150]
[285]
[490]
[205]
93G-94G
CAP
SCREW
2.000
1.000
1.125
1.250
1.500
1.625
1.750
1.875
1.375
1000
1650
CAP
1C-2C
105 000
2200
4200
525
1350
3500
720
2750
[2240]
SCREW,
[1830]
[975]
[1360]
[2980]
[3730]
[4750]
[5700]
[710]
15C-16C
BOLT
[725]
1200
AND
1500
2000
2500
3800
475
650
900
3150
NUT
61D-62D
SAE GRADE 5
[1220]
(2040]
[880]
[1630]
[645]
[2720]
[3390]
[4270]
[5150]
800
1625
2200
17C-18C
CAP
150 000
2850
4800
3800
6100
7200
1175
SCREW,
[1600]
[2200]
[1085]
[2980]
[3870]
[5150]
[6500]
[8300]
[9800]
23C-24C
BOLT
[1030]
1050
2000
2600
4300
AND
6500
725
5500
1475
3450
63D-64D
[2000]
NUT
SAE GRADE 8
[4680]
[8800]
[985]
[1425]
[2720]
[3530]
[5830]
[7450]
-
-
25C-26C
SOCKET
HEAD
8600
1000
1450
2000
CAP
2700
4600
7200
3450
73G-74G
5700
160 000
[4680]
[6240]
[11 700]
SCREW
[1360]
[1970]
[2720]
[3660]
[7730]
[9800]
12 POINT
1300
1850
2450
[1100]
900
4150
5100
6500
7800
3150
[1220]
HEAD
[8800]
[10 600]
[1770]
[2510]
93G-94G
[3330]
[4270]
[5630]
[6920]
CAP
SCREW
NOTES:
1. Torque values shown represent results of extensive laboratory testing, field experience and study of
accumulated supplier data on various types of cap screws coated with zinc phosphate and oil in accordance
with Clark Protective Treatment specification H and used with hardened plain or H coated washers, such as
covered by Clark standard 27E.
viii
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