16
Bolt Torque - 7420, 8420 & 8420G Snowblower
Hydraulic Fittings
Dash Size Thread Size
Jam Nut or Straight
ORB Fitting Torque
SAE 37° (JIC)
Swivel Nut Torque
(lbs-ft) (NM) (lbs-ft) (NM)
-4 (1/4) 7/16-20 16 - 14 20 - 22 11 - 10 13 - 15
-5 (5/16) 1/2-20 20 -18 24 - 27 15 - 13 18 - 20
-6 (3/8) 9/16-18 26 - 24 33 - 35 19 - 17 23 - 26
-8 (1/2) 3/4-16 60 - 50 68 - 78 38 - 34 47 - 52
-10 (5/8) 7/8-14 80 - 72 98 - 110 56 - 50 69 - 76
-12 (3/4) 1-1/16-12 135 - 125 170 - 183 78 - 70 96 - 106
-14 (7/8) 1-3/16-12 180 - 160 215 - 245 90 - 80 110 - 122
-16 (1) 1-5/16-12 220 - 200 270 - 300 104 - 94 127 - 141
-20 (1 1/4) 1-5/8-12 280 - 210 285 - 380 138 - 124 169 - 188
-24 (1 1/2) 1-7/8-12 360 - 270 370 - 490 173 - 156 212 - 235
Prevailing Torque Lock Nuts
Nut Size and
Threads per Inch
Grade B Nuts Grade C Nuts
Nut Tightening Torque Nut Tightening Torque
(lbs-ft) (NM) (lbs-ft) (NM)
Coarse Thread
1/4 - 20 7 - 5 7 - 9 10 - 7 9 - 14
3/16 - 18 12.5 - 9 12 - 17 16 - 11 15 - 22
3/8 - 16 20 - 14.5 20 - 27 28 - 20 27 - 38
7/16 - 14 32 - 23 31 - 43 43 - 31 42 - 58
1/2 - 13 50 -37 50 - 68 62.5 - 45 61 - 85
9/16 - 12 70 - 50 68 - 95 95 - 70 95 - 129
5/8 - 11 95 - 70 95 - 129 122.5 - 90 122 - 166
3/4 - 10 165 - 125 169 - 224 210 - 155 210 - 285
7/8 - 9 250 - 185 251 - 339 312.5 - 225 305 - 423
1 - 8 375 - 275 373 - 508 462.5 - 360 488 - 627
Fine Thread
1/4 - 28 7.5 / 5.5 7 - 10 10 -7 9 - 14
3/16 - 24 13 - 10 14 - 18 17 - 12 16 - 23
3/8 - 24 22 - 16 22 - 30 29 - 21 28 - 39
7/16 - 20 34 - 24 33 - 46 43 - 31 42 - 58
1/2 - 20 52.5 - 37.5 51 - 71 70 - 50 68 - 95
9/16 - 18 77.5 - 57.5 78 - 105 95 - 70 95 - 129
5/8 - 18 97.5 - 72.5 98 - 132 125 - 90 122 - 169
3/4 - 16 165 - 120 163 - 224 210 - 155 210 - 285
7/8 - 14 270 - 200 271 - 266 312.5 - 225 305 - 423
1 - 14 400 - 300 407 - 542 500 - 362.5 491 - 678
1) For Grade A locknut torque specifications refer to Grade B specifications.
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