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How to Tighten JIC Fittings

by New-Line Hose and Fittings | Sep 27, 2013

THE “FLATS” TIGHTENING METHOD FOR JIC

One of the most common causes of leaking JIC fittings is over tightening. Over tightening causes the mating seats to bind on each other resulting in a leak.



3 Steps to Improved Sealing of JIC Connections:
1. Tighten the nut by hand until it bottoms the seats.
2. Using a marker, draw a line lengthwise on the nut and extend it onto the adapter.
3. Using a wrench, rotate the nut to tighten. Turn the nut the amount shown on the chart.

Size

Number of Hex Flat Rotations

-04

1-½ to 1-¾

-06

1 to 1-½

-08

1-¼ to 1-¾

-10

1-¼ to 1-¾

-12

1 to 1-½

-16

¾ to 1

-20

½ to ¾

-24

½ to ¾

-32

½