TM 9-2320- 209-20-3-1 Table 1-1. Standard Torque Specifications USAGE MUCH USED MUCH USED USED AT TIMES USED AT TIMES To 1/2–69,000 T O 3/4–120,000 To 5/8– 140,000 150,000 [4850.7000] [8436.0000] [9842.0000] [ 10545.0000 ] CAPSCREW DIAMETER AND MINIMUM TENSILE STRENGTH T O 3/4–64,000 TO 1 –115,000 T O 3/4–133,000 PSl [KG/SQ CM] [499.2000] [8084.5000] [9349.9000] TO 1 –55,000 [3866.5000] QUALITY OF MATERIAL INDETERMINATE MINIMUM MEDIUM BEST COMMERCIAL COMMERCIAL COMMERCIAL SAE GRADE NUMBER 1or2 5 6or7 8 CAPSCREW HEAD MARKINGS Manufacturer's marks may vary These are all SAE Grade 5 (3-line) CAPSCREW BODY SIZE TORQUE TORQUE TORQUE TORQUE (lNCHES)–(THREAD) FT.LB [KG M] FT.LB [KG M] FT.LB [KG M] FT-LB [KG M] 1/4–20 5 [0.6915] 8 [1.1064] 10 [1.38301] 12 [1.6596] –28 5/16–18 -24 3/8–16 –24 7/16–14 – 20 1/2-13 –20 6 11 13 18 20 28 30 39 41 [0.8293] [1.5213] [1.7979] [2.4894] [2.7660] [3.8132] [4.1490] [5.3937] [5.6703] 10 17 19 31 35 49 55 75 85 [1.3830] [2.3511] 19 [2.6277] [4.2873] 34 [4.8405] [6.7767] 55 [7.6065] [10.3725] 85 [11.7555] 14 [1.9362] [2.6277] 24 27 [4.7022] 44 49 [7.6065] 70 78 [11.7555] 105 120 [3.3192] [ 3 . 7 3 4 1 ] [6.0852] [6.7767] [9.6810] [10.7874] [14.5215] [16.5960] 9/16–12 51 [7.0533] 110 [15.2130] 120 [16.5960] 155 [21.4365] –18 55 [7.6065] 120 [16.5960] 170 [23.5110] 5/8–11 83 [11.4769] 150 [20.7450] 167 [23.0961] 210 [29.0430] –18 95 [13.1385] 170 [23.5110] 240 [33.1920] 3/4–10 105 [14.5215] 270 [37.3410] 280 [38.7240] 375 [51.8625] –16 115 [15.9045] 295 [40.7985] 420 [58.0860] 718–9 160 [22.1280] 395 [54.6285] 440 [60.8520] 605 [83.67151 –14 175 [24.2025] 435 [60.1605] 675 [93.3525] 1 –8 235 [32.5005] 590 [81.5970] 660 [91.2780] 910 [125.8530] –14 250 [34.5750] 660 [91.2780] 990 [136.9170] 1. 2 3 4 Always use the torque values listed above when specific specifications are not available Note: Do not use above values in place of those specified in the engine groups of this manual, special attention should be observed In case of SAE Grade 6, 7 and 8 capscrews The above is based on use of clean and dry threads Reduce torque by 10% when engine oil is used as a Iubrlcant. Reduce torque by 20% if new plated capscrews are used Caution: Capscraws threaded into aluminum may require reductions In torque of 30% or more, unless inserts are used. TA 113439 1-3