National Crane 600H, Service Manual

Page: 27 / 232

NATIONAL CRANE
08-19-2022 Control # 092-13
1-15
600H SERVICE MANUAL INTRODUCTION
1
Table 1-9
Inch Series with Coarse Threads (UNC) – Untreated (black finish)
Size Grade
Torque (ft/lb)
Maximum Nominal Minimum
1/4-20
5 9.0 8.4 7.7
8 12.5 12 11.5
5/16-18
5 19 18 17
8 26 25 24
3/8-16
5 32 31 30
8 48 46 44
7/16-14
5 52 50 48
8 73 70 67
1/2-13
5 78 75 72
8 120 115 110
9/16-12
5 114 110 106
8 161 152 143
5/8-11
5 156 150 144
8 234 225 216
3/4-10
5 270 259.5 249
8 385 370 355
7/8-9
5 416 400 384
8 615 591 567
1-8
5 606 583 560
8 929 893 857
1 1/8-7
5 813 782 751
8 1342 1288 1234
1 1/4-7
5 1141 1097 1053
8 2043 1964 1885
1 3/8-6
5 1519 1461 1403
8 2496 2396 2296
1 1/2-6
5 2028 1946.5 1865
8 3276 3150 3024
Table 1-10
Inch Series with Fine Threads (UNF) – Untreated (black finish)
Size Grade
Torque (ft/lb)
Maximum Nominal Minimum
1/4-28
5 10 9.5 9
8 14.5 14 13.5
5/16-24
5 21 20 19
8 26 25 24
REFERENCE ONLY