Service Recommendations For Flat Face O-Ring Seal Fittings

1. Inspect the fitting sealing surfaces and O-ring. They must be free of dirt or defects.

2. Lubricate O-rings and install into grove using petroleum jelly to hold in place.

3. Index angle fittings and tighten by hand pressing joint together to insure O-ring remains in place.

4. Tighten fitting or nut to torque value shown on the chart. Do not allow hoses to twist when tightening fittings, use backup wrench on straight hose couplings.

IMPORTANT: Tighten fittings to 150% of listed torque value if indexing is necessary or if fitting is attached to an actuating devise.

Tighten fittings to 50% of listed torque value if used in aluminum housing.

FLAT FACE O-RING SEAL FITTING TORQUE*
Nomial Tube O.D. Thread Size Swivel Nut Bulkhead Nut
mm in. in. N·m lb-ft N·m lb-ft
6.35 0.250 9/16-18 16 12 12 9
9.52 0.375 11/16-16 24 18 24 18
12.70 0.500 13/16-16 50 37 46 34
15.88 0.625 1-14 69 51 62 46
19.05 0.750 1 3/16-12 102 75 102 75
22.22 0.875 1 3/16-12 102 75 102 75
25.40 1.000 1 7/16-12 142 105 142 105
31.75 1.250 1 11/16-12 190 140 190 140
38.10 1.500 2-12 217 160 217 160
*Torque tolerance is +15 -20% unless otherwise specified.

 

OUO1078,000005B -19-11JUN08-1/2

Stud End O-ring Seal Torque for Straight and Adjustable Fittings*
Thread Size Straight Hex Size Locknut Hex Size Straight Fitting or Locknut Toque
Inch Inch Inch N·m lb-ft
3/8-24 5/8 9/16 12 9
7/16-20 5/8 5/8 21 15
1/2-20 3/4 11/16 26 19
9/16-18 3/4 3/4 34 25
3/4-16 7/8 15/16 73 55
7/8-14 1 1/16 1 1/16 104 76
1 1/16-12 1 1/4 1 3/8 176 130
1 3/16-12 1 3/8 1 1/2 230 170
1 5/16-12 1 1/2 1 5/8 285 210
*Torque tolerance is +15 -20% unless otherwise specified.

 

OUO1078,000005B -19-11JUN08-2/2