Precision grade JIS quality N9 (JIS B1702-1: 1998) JIS quality 5 (JIS B1702: 1976)


section of gear Normal plane

Gear teeth Standard complete depth


pressure angle 20°

Helix angle 45°

Material CAC702
① When mating screw gears manufactured from the same material they may trigger abrasion and scoring. It is suggested to mate Screw Gears composed of different materials.

② The allowable torques demonstrated in the table are the calculated values based on the assumed usage conditions.

③ The backlash values demonstrated in the table will be the theoretical values for the backlash in the normal direction of a pair ofidentical gears in mesh.

④ For offset shaft applications, match a RH with a RH, or LH with a LH, to create a set of screw gears. For parallel shaft applications,

mesh opposite hands (RH and LH) of helical equipment sets.

⑤ If the bore diameter is definitely less than φ 4, then the bore tolerance class can be H8. If the bore diameter is definitely φ 5 or φ 6, and the hole Aluminum-Bronze Screw Gears length (total length) exceeds 3 times the diameter, then your class is also H8.