National Crane 600H, Руководство по обслуживанию

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INTRODUCTION 600H SERVICE MANUAL
1-14
08-19-2022 Control # 092-13
Torque Values for fasteners with lubrication these torque values result in an 80% utilization of the yield strength.
Stainless steel fasteners tend to gall while being tightened. To reduce this risk, lubricate the threads and torque at low speeds
without interruptions. Do not use excessive pressure. Impact wrenches are not recommended.
Torque Values for fasteners with lubrication these torque and preload values result in an 80% utilization of the yield strength.
Stainless steel fasteners tend to gall while being tightened. To reduce this risk, lubricate the threads and torque at low speeds
without interruptions. Do not use excessive pressure. Impact wrenches are not recommended.
M8x1.25 13
M10x1.5 27
Table 1-6 Inch Series Screws of STAINLESS STEEL 300 (18-8) with Coarse Threads
Size
Torque
lb-in lb-ft
#5-40 (0.125) 6.9 -
#6-32 (0.138) 9 -
#8-32 (0.164) 18 -
#10-24 (0.190) 21 -
1/4-20 68 -
5/16-18 120 10
3/8-16 210 17.5
Table 1-7 Inch Series Bearing Bolts – Untreated (black finish)
Nominal Size, Threads per
Inch, and Series
Designation
Grade
Torque (ft/lb)
Maximum Nominal Minimum
5/8-11 UNC 8 234 225 216
5/8-18 UNF 8 250 240 230
3/4-10 UNC 8 385 370 355
7/8-9 UNC 8 615 591 567
1-8 UNC 8 929 893 857
1 1/4-7 UNC 8 2043 1964 1885
Table 1-5 Metric Series Screws of STAINLESS STEEL A2-70/A4-70 with Coarse Threads (Continued)
Size Torque (Nm)
Table 1-8 Metric Series Bearing Bolts– Untreated (black finish)
Nominal Size, Threads per
millimeter, and Series
Designation
Class
Torque (Nm)
Maximum Nominal Minimum
M20X2.5 12.9 756 727 698
M24X3 10.9 1089 1047 1005
M24X3 12.9 1306 1256 1206
M27X3 10.9 1591 1530 1469
REFERENCE ONLY