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TORQUE SPECIFICATIONS
Proper torque for American fasteners used on Locke Turf
equipment. Recommended Torque in Foot Pounds
WRENCH
SIZE (IN.) “A”
BOLT DIAMETER
(IN.) “B” AND
THREAD SIZE
SAE
GRADE 2
SAE
GRADE 5
SAE
GRADE 8
7/16 1/4 –20 UNC 6 (7) 8 (11) 12 (16)
7/16 1/4 –28 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 (402) 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 (1992)
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)
B
o
l
t
D
i
a
m
e
t
e
r
"
B
"
t
"
Wrench
Size "A"
SAE Grade 2
(No Dashes)
SAE Grade 5
(3 Dashes)
SAE Grade 8
(6 Dashes)
METRIC
AMERICAN
Bolt Head Markings
WRENCH
SIZE
(mm) “A”
BOLT
DIA.
(mm) “B”
ASTM
4.6
ASTM
8.8
ASTM
9.8
ASTM
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)
1138 (1542)
46 30 418 (566) 1119 (1516)
1547 (2096)
Proper torque for American fasteners used on Locke Turf equipment.
Recommended Torque in Foot Pounds (Newton Meters). *
Numbers appearing on bolt heads
Indicate ASTM class.
*Use 75% of the specified torque value
for plated fasteners. Use 85% of the
specified torque values for lubricated
fasteners.
B
o
l
t
D
i
a
m
e
t
e
r
"
B
"
Wrench
Size "A"
8.8
18