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WRENCH SIZE
BOLT DIA.
ASTM
ASTM
ASTM
ASTM
(mm) “A”
(mm) ”B”
4.6
8.8
9.8
10.9
8
5
1.8 (2.4)
5.1 (6.9)
6.5 (8.8)
10
6
3 (4)
8.7 (12)
11.1 (15)
13
8
7.3 (10)
21.1 (29)
27 (37)
16
10
14.5 (20)
42 (57)
53 (72)
18
12
25 (34)
74 (100)
73 (99)
93 (126)
21
14
40 (54)
118 (160)
116 (157)
148 (201)
24
16
62 (84)
167 (226)
181 (245)
230 (312)
30
20
122 (165)
325 (440)
449 (608)
33
22
443 (600)
611 (828)
36
24
211 (286)
563 (763)
778 (1054)
41
27
821 (1112)
138(1542)
46
30
418 (566)
1119 (1516)
1547(2096)
P
roper torque for American fasteners used on manufactured implement.
Recommended Torque in Foot Pounds (Newton Meters).*
WRENCH
BOLT DIAMETER
SAE
SAE
SAE
SIZE(IN.)”A”
(IN.)”B” AND
GRADE 2
GRADE 5
GRADE 8
THREAD SIZE
7/16
1/4 -20 UNC
6 (7)
8 (11)
12 (16)
7/16
1/4 - 24 UNF
6 (8)
10 (13)
14 (18)
1/2
5/16 -18 UNC
11 (15)
17 (23)
25 (33)
1/2
5/16 - 24 UNF
13 (17)
19 (26)
27 (37)
9/16
3/8 - 16 UNC
20 (27)
31 (42)
44 (60)
9/16
3/8 -24 UNF
23 (31)
35 (47)
49 (66)
5/8
7/16 -14 UNC
32 (43)
49 (66)
70 (95)
5/8
7/16 - 20 UNF
36 (49)
55 (75)
78 (106)
3/4
1/2 - 13 UNC
49 (66)
76 (103)
106 (144)
3/4
1/2 - 20 UNF
55 (75)
85 (115)
120 (163)
7/8
9/16 -12 UNC
70 (95)
109 (148)
153 (207)
7/8
9/16 - 18 UNF
79 (107)
122 (165)
172 (233)
15/16
5/8 - 11 UNC
97 (131)
150 (203)
212 (287)
15/16
5/8 - 18 UNF
110 (149)
170 (230)
240 (325)
1-1/8
3/4 - 10 UNC
144(195)
266 (360)
376 (509)
1-1/8
3/4 - 16 UNF
192 (260)
297 (406)
420 (569)
1-5/16
7/8 - 9 UNC
166 (225)
430 (583)
606 (821)
1-5/16
7/8 - 14 UNF
184 (249)
474 (642)
668 (905)
1-1/2
1-8 UNC
250 (339)
644 (873)
909 (1232)
1-1/2
1 - 12 UNF
274 (371)
705 (955)
995 (1348)
1-1/2
1-14 UNF
280 (379)
721 (977)
1019 (1381)
1-11/16
1-1/8 - 7 UNC
354 (480)
795 (1077)
1288 (1745)
1-11/16
1-1/8 -12 UNF
397 (538)
890 (1206)
1444 (1957)
1-7/8
1-1/4 - 7 UNC
500 (678)
1120 (1518)
1817 (2462)
1-7/8
1-1/4 - 12 UNF
553 (749)
1241 (1682)
2013 (2728)
2-1/16
1-3/8 - 6 UNC
655 (887)
1470 (1992)
2382 (3228)
2-1/16
1-3/8 -12 UNF
746 (1011)
1672 (2266)
2712 (3675)
2-1/4
1-1/2 - 6 UNC
870 (1179)
1950 (2642)
3161 (4283)
2-1/4
1-1/2 - 12 UNF
979 (1327)
2194 (2973)
3557 (4820)
AMERICAN
Bolt Head Markings
SAE Grade 2
(No Dashes)
SAE Grade 5
(3 Dashes)
SAE Grade 8
(6 Dashes)
Bolt
Diameter “B”
Wrench
Size “A”
P
roper torque for metric fasteners used on manufacturer emplement.
Recommended Torque in Foot Pounds (Newton Meters).*
8.8
Bolt
Diameter “B”
Wrench
Size “A”
METRIC
Numbers appearing on bolt heads
indicate ASTM classes.
*Use 75% of the speci ed torque value for
plated fasteners. Use 85% of the speci ed
torque values for lubricated fasteners.
TORQUE SPECIFICATIONS
32 Torque Speci cations