SEAL-O-RING 3231731 - Caterpillar

37 Degree Flare Fittings
Illustration 1 g01848048
(1) 37 degree flare fitting
(2) Swivel nuts
Table 1
Nuts for 37 Degree Flare Fittings
Nominal Outer Diameter of the Tube Thread Size
Inch Standard Torque
3.18 mm (0.125 inch) 5/16 - 24 10 2 N m (89 18 lb in)
4.76 mm (0.188 inch) 3/8 - 24 13 2 N m (115 18 lb in)
6.35 mm (0.250 inch) 7/16 - 20 20 3 N m (177 27 lb in)
7.94 mm (0.312 inch) 1/2 - 20 25 4 N m (221 35 lb in)
9.52 mm (0.375 inch) 9/16 - 18 30 5 N m (266 44 lb in)
12.70 mm (0.500 inch) 3/4 - 16 60 9 N m (44 7 lb ft)
15.88 mm (0.625 inch) 7/8 - 14 90 13 N m (66 10 lb ft)
19.05 mm (0.750 inch) 1 1/16 - 12 120 18 N m (89 13 lb ft)
22.22 mm (0.875 inch) 1 3/16 - 12 130 20 N m (96 15 lb ft)
25.40 mm (1.000 inch) 1 5/16 - 12 160 24 N m (118 18 lb ft)
31.75 mm (1.250 inch) 1 5/8 - 12 260 39 N m (192 29 lb ft)
38.10 mm (1.500 inch) 1 7/8 - 12 260 39 N m (192 29 lb ft)
50.80 mm (2.000 inch) 2 1/2 - 12 350 53 N m (258 39 lb ft) Note: Use 50 percent of the torque values from Table 1 when the fitting or the port material is nonferrous.45 Degree Flare and Inverted Flare Fittings
Illustration 2 g03335997
(3) Inverted Flare Fittings
(4) 45 Degree Flare Fittings
Table 2
45 Degree Flare Fittings and 45 Degree Inverted Flare Fittings
Nominal Outer Diameter of the Tube Thread Size
Inch Standard Torque
3.18 mm (0.125 inch) 5/16 7 1 N m (62 9 lb in)
4.76 mm (0.188 inch) 3/8 10 2 N m (89 18 lb in)
6.35 mm (0.250 inch) 7/16 13 2 N m (115 18 lb in)
7.94 mm (0.312 inch) 1/2 20 3 N m (177 27 lb in)
9.52 mm (0.375 inch) 5/8 35 5 N m (26 4 lb ft)
11.11 mm (0.438 inch) 11/16 35 5 N m (26 4 lb ft)
12.70 mm (0.500 inch) 3/4 40 6 N m (30 4 lb ft)
15.88 mm (0.625 inch) 7/8 55 8 N m (41 6 lb ft)
19.05 mm (0.750 inch) 1 1/16 100 15 N m (74 11 lb ft)
22.22 mm (0.875 inch) 1 1/4 110 17 N m (81 13 lb ft)