Hitachi 4HK1 Workshop Manual page 23

1. Hex bolt (4.8, 4T)
2. Hex bolt (4.8, 4T)
3. Flange bolt (4.8, 4T)
4. Flange bolt (4.8, 4T)
5. Hex bolt (7T)
6. Flange bolt (7T)
7. Hex bolt (Thermally refined 8.8)
8. Hex bolt (Thermally refined 8.8)
9. Hex bolt (Non-thermally refined 8.8)
： 4.6 mm { 0.181 in }
： 6.35 mm { 0.25 in }
Tightening torque for
the flare nut
Service standard value
： 10.0 mm { 0.39 in }
： 12.0 mm { 0.47 in }
： 15.0 mm { 0.59 in }
Tightening torque for medium and heavy
Pipe diameter
： 12.8 to 18.6 N・m { 1.3 to 1.9 kgf・
： 23.5 to 49.0 N・m { 2.4 to 5.0 kgf・
： 23.5 to 49.0 N・m { 2.4 to 5.0 kgf・
： 8.0 mm { 0.31 in }
： 44.1 to 93.2 N・m { 4.5 to 9.5 kgf・
： 58.8 to 137.3 N・m { 6.0 to 14.0 kgf・
： 78.5 to 156.9 N・m { 8.0 to 16.0 kgf・
Service Information Guide (All) 14A-17
10. Hex bolt (Non-thermally refined 8.8)
11. Flange bolt (8.8)
12. Flange bolt (8.8)
13. Hex bolt (9.8, 9T)
14. Hex bolt (9.8, 9T)
15. Flange bolt (9.8, 9T)
16. Flange bolt (9.8, 9T)
duty vehicles
m / 9 to 14 lb・ft }
m / 17 to 36 lb・ft }
m / 17 to 36 lb・ft }
m / 33 to 69 lb・ft }
m / 43 to 101 lb・ft }
m / 58 to 116 lb・ft }
Flare nut width across flats
Old New
： 14 mm ： 14 mm
{ 0.55 in } { 0.55 in }
： 17 mm ： 17 mm
{ 0.67 in } { 0.67 in }
： 19 mm ： 17 mm
{ 0.75 in } { 0.67 in }
： 22 mm ： 19 mm
{ 0.87 in } { 0.75 in }
： 27 mm ： 24 mm
{ 1.06 in } { 0.94 in }
： 30 mm ： 30 mm
{ 1.18 in } { 1.18 in }