TM 5-5420-278-24&P0075 000075 00-1TORQUE LIMITSGENERALNOTEUse standard torque limits when tightening screws that areinstalled in thread inserts unless noted.This work package provides general torque limits for screws used on the IRB-R and IRB-I bays. Specialtorque limits are indicated within the maintenance tasks for applicable components. The general torquelimits given in this work package shall be used when specific torque limits are not indicated in themaintenance task. These general torque limits cannot be applied to screws that retain rubber components.Rubber components will become damaged before the correct torque limit can be reached.TORQUE TABLESTable 1 lists dry torque limits. Dry torque limits are used on screws that do not have lubricants appliedto the threads. Table 2 lists wet torque limits. Wet torque limits are used on screws that have highpressure lubricants applied to the threads. For metric fasteners, refer to table 3 for torque limitrequirements.HOW TO USE TORQUE TABLES1.Measure the diameter of the screw.2.Count the number of threads per inch.3.Under the heading SIZE, look down the left hand column and find the diameter of the screw. (Therewill usually be two lines beginning with the same size).4.In the second column under SIZE, find the number of threads per inch that matches the number ofthreads you counted in step 2 (not required for metric screws).5.Determine the grade of screw by matching the markings on the head of the screw to the correctpicture of CAPSCREW HEAD MARKINGS in the illustration preceding the torque limits table.6.Look down the column under the picture you found in step 5 until you find the torque limit (in lb-ft orN.m) for the diameter and threads per inch of the screw.CAPSCREW HEAD MARKINGSManufacturer’s marks may vary.Metric screws are of three grades: 8.8,These are all SAE Grade 5 (3-line)10.9, and 12.9. Grades & Manufacturer’smarks appear on the screw head8.8 10.9 12.9STANDARDMETRIC
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