Hitachi 6HK1 Workshop Manual page 25

Tightening torque of
the flare nut
Service standard value
Tapered thread for connectors and brass products
Screw size
： 2.0 to 14.7 N・m
- { 0.20 to 1.50 kgf・m /
Tapered thread for products other than connectors and brass products
Screw size PT (R) 1/8
： 5.9 to 11.8 N・m
- { 0.6 to 1.2 kgf・m /
52 to 104 lb・in }
Note：
・ The tightening torque of the tapered thread for
products other than connectors and brass
products is only applied when the opposite
side is not made of aluminum.
Pipe diameter
： 4.6 mm { 0.181 in }
： 6.35 mm { 0.25 in }
： 8.0 mm { 0.31 in }
： 10.0 mm { 0.39 in }
： 58.8 to 137.3 N・m { 6.0 to 14.0 kgf・
： 12.0 mm { 0.47 in }
： 78.5 to 156.9 N・m { 8.0 to 16.0 kgf・
： 15.0 mm { 0.59 in }
PT (R) 1/8
： 4.9 to 15.7 N・m
{ 0.5 to 1.6 kgf・m / 43
18 to 130 lb・in }
PT (R) 1/4
： 14.7 to 29.4 N・
m { 1.5 to 3.0 kgf・
m / 11 to 22 lb・ft }
Service Information Guide (All models) 14A-19
Tightening torque for large/medium size
vehicles
： 12.8 to 18.6 N・m { 1.3 to 1.9 kgf・
m / 9 to 14 lb・ft }
： 23.5 to 49.0 N・m { 2.4 to 5.0 kgf・
m / 17 to 36 lb・ft }
： 23.5 to 49.0 N・m { 2.4 to 5.0 kgf・
m / 17 to 36 lb・ft }
： 44.1 to 93.2 N・m { 4.5 to 9.5 kgf・
m / 33 to 69 lb・ft }
m / 43 to 101 lb・ft }
m / 58 to 116 lb・ft }
PT (R) 1/4
： 9.8 to 16.7 N・m
{ 1.0 to 1.7 kgf・m / 87
to 139 lb・in }
PT (R) 3/8
： 29.4 to 39.2 N・
m { 3.0 to 4.0 kgf・
m / 22 to 29 lb・ft }
Note：
・ For the elbow-type connector, tighten it with
the minimum torque shown above and then
tighten it further until the angle matches.
・ Apply Loctite 575 to the threaded portion and
tighten. Completely dry then let air in after
tightening.
・ Do not use seal tape, etc.
Flare nut width across flat
Previous
： 14 mm
{ 0.55 in }
： 17 mm
{ 0.67 in }
： 19 mm
{ 0.75 in }
： 22 mm
{ 0.87 in }
： 27 mm
{ 1.06 in }
： 30 mm
{ 1.18 in }
PT (R) 3/8
： 9.8 to 17.7 N・m
{ 1.0 to 1.8 kgf・m / 87
to 148 lb・in } to 157 lb・in }
PT (R) 1/2
： 58.8 to 98.0 N・
： 29.4 to 58.8 N・
m { 3.0 to 6.0 kgf・
m / 22 to 43 lb・ft }
New
： 14 mm
{ 0.55 in }
： 17 mm
{ 0.67 in }
： 17 mm
{ 0.67 in }
： 19 mm
{ 0.75 in }
： 24 mm
{ 0.94 in }
： 30 mm
{ 1.18 in }
PT (R) 1/12
PT (R) 3/4
m { 6.0 to 10.0
kgf・m / 43 to 72
lb・ft }