Manitowoc National Crane NBT30H-2 - Page 25

National Crane 03-20-2019 Control # 613-06 1-15
NBT30H-2 SERVICE MANUAL INTRODUCTION
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Table 1-6 Inch Series with Fine Threads (UNF) – Zinc Flake Coated
Table 1-7 Metric Series with Coarse Threads – Zinc Flake Coated
Nominal Size, Threads per
Inch, and Series
Designation
Grade
Torque (ft/lb)
Maximum Nominal Minimum
1/4-28 UNF
5 7.5 7.3 7.1
8 10.6 10.4 10.1
5/16-24 UNF
5 15.0 14.6 14.2
8 21.1 20.6 20.1
3/8-24 UNF
5 27.2 26.5 25.8
8 38.4 37.5 36.5
7/16-20 UNF
5 42.9 41.8 40.7
8 60.6 59.1 57.6
1/2-20 UNF
5 66.0 64.4 62.7
8 93.3 90.9 88.6
9/16-18 UNF
5 94.3 91.9 89.6
8 133.2 129.9 126.6
5/8-18 UNF
5 132.1 128.8 125.5
8 186.7 182.0 177.3
3/4-16 UNF
5 231.0 225.2 219.4
8 326.4 318.2 310.1
7/8-14 UNF
5 367.7 358.5 349.3
8 519.6 506.6 493.6
1-12 UNF
5 547.4 533.7 520.0
8 773.5 754.2 734.8
1 1/8-12 UNF
5 700.0 682.5 665.0
8 1123.5 1095.4 1067.3
1 1/4-12 UNF
5 975.0 950.6 926.2
8 1564.8 1525.7 1486.5
1 3/8-12 UNF
5 1314.4 1281.5 1248.6
8 2109.5 2056.7 2004.0
1 1/2-12 UNF
5 1723.9 1680.8 1637.7
8 2766.8 2697.6 2628.4
Nominal Size, Threads per
Inch, and Series
Designation
Property
Class
Torque (Nm)
Maximum Nominal Minimum
M4x0.7
10.9 3.6 3.5 3.4
12.9 4.2 4.1 4.0
M5x0.8
10.9 7.2 7.0 6.8
12.9 8.4 8.2 8.0