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


portion of gear Normal plane

Gear teeth Standard full depth


pressure angle 20°

Helix angle 45°

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

② The allowable torques demonstrated in the table are the calculated values according to the assumed usage conditions.

The backlash values demonstrated in the table are the theoretical ideals for the backlash in the standard direction of a set ofidentical gears in mesh.

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

mesh reverse hands (RH and LH) of Aluminum-Bronze Screw Gears helical equipment sets.

⑤ If the bore diameter is definitely less than φ 4, then the bore tolerance class is H8. If the bore diameter is φ 5 or φ 6, and the hole length (total size) exceeds three times the diameter, then the class is also H8.