Specifications
Precision grade JIS quality N9 (JIS B1702-1: 1998) JIS quality 5 (JIS B1702: 1976)
Reference
portion of Gang Aluminum-Bronze Screw Gears Normal plane
Gear teeth Standard full depth
Normal
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 recommended to mate Screw Gears made up of different materials.
② The allowable torques proven in the table are the calculated values based on the assumed usage conditions.
③ The backlash values demonstrated in the table are 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 make 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 usually less than φ 4, then the bore tolerance class is definitely H8. If the bore diameter is definitely φ 5 or φ 6, and the hole length (total length) exceeds three times the diameter, then the class can be H8.
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