A05001 11/05 Standard Torque Charts and Conversion Tables A5-1
STANDARD TORQUE CHARTS AND CONVERSION TABLES
This manual provides U.S. standard and metric (SI)
units for most specifications.
References throughout the manual to standard torques
or other standard values will be to one of the following
charts or tables. For values not shown in these charts
or tables, standard conversion factors for most
commonly used measurements are provided in Table
XIII.
Standard torque values are not to be used when “turn-
of-the-nut” tightening procedures are recommended.
INDEX OF TABLES
Table I . . . . . . . .Standard Torque Chart (SAE) . . A5-1
Table II. . .Standard Torque, 12-Point, Grade 9 . . A5-2
Table III . . . Standard Metric Assembly Torque . . A5-2
Table IV . . . . . . .JIC Swivel Nuts Torque Chart . . A5-3
Table V . . . . . . . . . Pipe Thread Torque Chart . . A5-3
Table VI . . . . . . . . . O-Ring Boss Torque Chart . . A5-3
Table VII . . . .O-Ring Face Seal Torque Chart . . A5-3
Table VIII . .Torque Conversions (ft lbs to N•m) . . A5-4
Table IX . . Torque Conversions (ft lbs to kg•m) . . A5-4
Table X . . . Pressure Conversions (psi to kPa) . . A5-4
Table XI . . Pressure Conversions (psi to MPa) . . A5-5
Table XII . . . . . . . . Temperature Conversions . . A5-5
Table XIII . . . .Common Conversion Multipliers . . A5-6
EFFECT OF SPECIAL LUBRICANTS
On Fasteners and Standard Torque Values
Komatsu does not recommend the use of special
friction-reducing lubricants, such as Copper Coat,
Never-Seez®, and other similar products, on the
threads of standard fasteners where standard torque
values are applied. The use of special friction-reducing
lubricants will significantly alter the clamping force
during the tightening process.
If special friction-reducing lubricants are used,
excessive stress and possible breakage of the
fasteners may result.
When the torque tables specify “lubricated threads” for
the standard torque values listed, these standard
torque values are to be used with simple lithium base
chassis grease (multi-purpose EP NLGI) or a rust-
preventive grease (see list, page A5-2) on the threads
and seats unless specified otherwise.
Verify threads and tapped holes are free of burrs and
other imperfections before installing hardware.
TABLE I. -STANDARD TORQUE CHART
SAE HEX HEAD CAPSCREW AND NUT ASSEMBLY
(LUBRICATED THREADS) - TOLERANCES ±10%
Cap-
screw
Thread
Size
TORQUE -
GRADE 5
TORQUE -
GRADE 8
Cap-
screw
Thread
Size
TORQUE -
GRADE 5
TORQUE -
GRADE 8
ft lbs kg•m N•m ft lbs kg•m N•m ft lbs kg•m N•m ft lbs kg•m N•m
1/4-20 7 0.97 9.5 10 1.38 13.6 3/4-16 235 32.5 319 335 46.3 454
1/4-28 8 1.11 10.8 11 1.52 14.9 7/8-9 350 48.4 475 500 69.2 678
5/16-18 15 2.07 20.3 21 2.90 28 7/8-14 375 51.9 508 530 73.3 719
5/16-24 16 2.21 22 22 3.04 30 1.0-8 525 72.6 712 750 103.7 1017
3/8-16 25 3.46 34 35 4.84 47 1.0-12 560 77.4 759 790 109.3 1071
3/8-24 30 4.15 41 40 5.5 54 1.0-14 570 78.8 773 800 110.6 1085
7/16-14 40 5.5 54 58 8.0 79 1 1/8-7 650 89.9 881 1050 145 1424
7/16-20 45 6.2 61 62 8.57 84 1 1/8-12 700 96.8 949 1140 158 1546
1/2-13 65 9 88 90 12.4 122 1 1/4-7 910 125.9 1234 1480 205 2007
1/2-20 70 9.7 95 95 13.1 129 1 1/4-12 975 134.8 1322 1580 219 2142
9/16-12 90 12.4 122 125 17.3 169 1 3/8-6 1200 166 1627 1940 268 2630
9/16-18 95 13.1 129 135 18.7 183 1 3/8-12 1310 181 1776 2120 293 2874
5/8-11 125 17.3 169 175 24.2 237 1 1/2-6 1580 219 2142 2560 354 3471
5/8-18 135 18.7 183 190 26.2 258 1 1/2-12 1700 235 2305 2770 383 3756
3/4-10 220 30.4 298 310 42.8 420
1 ft lbs = 0.138 kg•m = 1.356 N•m
Grade 5
Grade 8
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