Symbols or abbreviation
OP
Option
R1/4
Taper pipe thread (external) 1/4 inch (formerly PT1/4)
Rc1/8
Taper pipe thread (internal) 1/8 inch (formerly PT1/8)
G1/4A
Straight pipe thread (external) 1/4 inch (formerly PF1/4-A)
Rp1/8
Straight pipe thread (internal) 1/8 inch (formerly PS1/8)
Units
1.
SI Units are used in this manual.
2.
The following table shows the conversion of SI unit and customary unit.
Item
SI unit
Customary unit
Force
1 N
0.1020 kgf
(1 lbf)
(0.4536 kgf)
Pressure
1 kPa
0.0102 kgf/cm
2
(1 psi)
(0.0703 kgf/cm
2
)
Torque
1 N·m
0.1020 kgf·m
(1 lbf·ft)
(0.1383 kgf·m)
