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The art of making a leak-proof connection with hydraulic couplings is to tighten the couplings properly at the time of installation. An overtightened coupling may be just as apt to leak as an under tightened coupling. This is because over-tightening a coupling may result in overstressing and/or cracking. The torque values in the following table give minimum and maximum torque recommendations. The minimum value will create a leakproof seal under most conditions. Applying torque values greater than the maximum recommendation will distort and/or crack the fitting.

Coupling and Adapter Torque Recommendation

For 37° & 45° (Machined or Flared)

Size Steel Brass
Ft. Lbs. Newton-Meters Ft. Lbs. Newton-Meters
Dash Inches Min Max Min Max Min Max Min Max
-4 1/4 10 11 13 15 5 6 6-3/4 9
-5 5/16 13 15 18 20 7 9 10 13
-6 3/8 17 19 23 26 12 15 17 20
-8 1/2 34 38 47 52 20 24 27-2/3 33
-10 5/8 50 56 69 76 34 40 46-1/3 55
-12 3/4 70 78 96 106 53 60 72-1/3 82
-16 1 94 104 127 141 74 82 100-1/2 111
-20 1-1/4 124 138 169 188 75 83 101-1/2 113
-24 1-1/2 156 173 212 235 79 87 107 118
-32 2 219 243 296 329 158 175 214 237

For Flat-Face O-Ring Seal (Steel)

Size Newton-Meters
Dash Inches Min Max
-4 1/4 14 16
-6 3/8 24 27
-8 1/2 43 54
-10 5/8 60 75
-12 3/4 90 110
-14 7/8 90 110
-16 1 125 240
-20 1-1/4 170 190
-24 1-1/2 200 245

For SAE O-Ring Boss (Steel)

Size
Ft.Lbs. Working  Pressures
4,000 psi (27.5 Mpa) and below
Newton-Meters Working Pressures 4,000 psi (27.5 Mpa) and below  Ft.Lbs. Working Pressures Above 4,000 psi (27.5  Mpa)
Newton-Meters  Working Pressures
Above 4,000 psi (27.5  Mpa)
Dash Inches Min Max Min Max Min Max Min Max
-3 3/16 8 10 11 13
-4 1/4 14 16 20 22 14 16 20 22
-5 5/16 18 20 24 27
-6 3/8 24 26 33 35 24 26 33 35
-8 1/2 37 44 50 60 50 60 68 78
-10 5/8 50 60 68 81 72 80 98 110
-12 3/4 75 83 101-1/2 113 125 135 170 183
-14 7/8 160 180 215 245
-16 1 111 125 150 170 200 220 270 300
-20 1-1/4 133 152 180 206 210 280 285 380
-24 1-1/2 156 184 212 250 270 360 370 490

For BSP 30° Inverted Cone

Size Ft.-Lbs. Newton-Meters
Dash Inches Min Max Min Max
-2 1/8 7 9 9 12
-4 1/4 11 18 15 24
-6 3/8 19 28 26 38
-8 1/2 30 36 41 49
-10 5/8 37 44 50 60
-12 3/4 50 60 68 81
-16 1 79 95 107 129
-20 1-1/4 127 152 172 206
-24 1-1/2 167 190 226 258
-32 2 262 314 355 426

For DIN 2353 12°, 30°  and Universal Inverted Cone

Size Ft.-Lbs. Newton-Metres
Light Series Tube O.D. (mm) Heavy Series Tube O.D. (mm) Min Max Min Max
-6 7 15 10 20
-8 15 26 20 35
-10 -8 18 30 25 40
-12 -10 22 33 30 45
-14 -12 26 37 35 50
-15 -14 30 52 40 70
-16 30 52 40 70
-18 44 74 60 100
-22 -20 59 89 80 120
-28 -25 74 111 100 150
-30 74 162 150 220
-35 133 184 180 250
-42 -38 148 221 200 300

Maximum Recommended Torque for Dry NPTF (Tapered) Pipe Threads

Size Ft-Lbs. Newton-Meters
-2 20 25


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