Perkins 2800 - Standard Torque Figures for O Ring Face Seal Fittings and 37 Degree Flared Fittings

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Workshop Manual, TSD3450E, Issue 1 21
2800
Standard torque figures for ‘O’ ring face seal fittings and 37 degree flared fittings
Note: For the table above, use 50 percent of the torque figure when the fitting, the plug or the port material is
nonferrous.
Examples of relevant fittings are shown (A): ‘O’ ring face seal (A1), 37 degree flare (A2) and plug with a
hexagon or socket-type head (A3).
Torque figures for ferrous straight thread ‘O’ ring fittings when connected to ferrous materials
Outside diameter of nominal tube
Thread size
Inches
Standard
torque
3,18 mm
(0.125 in)
5/16 - 24
5,0 +/- 1,5 Nm
(4 +/- 1 lbf ft)
4,76 mm
(0.188 in)
3/8 - 24
12 +/- 2 Nm
(9 +/- 1 lbf ft)
6,35 mm
(0.250 in)
7/16 - 20
22 +/- 2 Nm
(16 +/- 1 lbf ft)
7,94 mm
(0.312 in)
1/2 - 20
30 +/- 3 Nm
(22 +/- 2 lbf ft)
9,52 mm
(0.375 in)
9/16 - 18
48 +/- 5 Nm
(35 +/- 4 lbf ft)
12,70 mm
(0.500 in)
3/4 - 16
82 +/- 8 Nm
(60 +/- 6 lbf ft)
15,88 mm
(0.625 in)
7/8 - 14
143 +/- 15 Nm
(105 +/- 11 lbf ft)
19,05 mm
(0.750 in)
1 1/16 - 12
190 +/- 20 Nm
(140 +/- 15 lbf ft)
22,22 mm
(0.875 in)
1 3/16 - 12
250 +/- 25 Nm
(185 +/- 18 lbf ft)
25,40 mm
(1.000 in)
1 5/16 - 12
300 +/- 30 Nm
(220 +/- 22 lbf ft)
31,75 mm
(1.250 in)
1 5/8 - 12
350 +/- 30 Nm
(260 +/- 22 lbf ft)
38,10 mm
(1.500 in)
1 7/8 - 12
430 +/- 40 Nm
(320 +/- 30 lbf ft)
50,80 mm
(2.000 in)
2 1/2 - 12
450 +/- 45 Nm
(330 +/- 33 lbf ft)