Specifications
Precision grade JIS Plastic Screw Gears quality N9 (JIS B1702-1: 1998) ＊ JIS quality 5 (JIS B1702: 
1976)
Reference
section of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 20°
Helix angle 45°
Material Acetal Acetal is definitely a stable plastic-type material with inherent self-lubricating properties which can be enhanced with lubricating fillers.
Delrin Delrin is an engineered plastic-type material with a good combination of toughness, stiffness, put on and abrasion level of resistance, and low frictional characteristics.
Nylon Nylon, comprising many grades of polyamides, is a general-purpose material in wide use. It is tough and resistant and has great pressure ratings.
Polycarbonate Polycarbonate can be an extremely challenging polymer that can be machined to close tolerances. Lubrication may also be needed, as the use properties of polycarbonate aren’t as good as some other polymers.
Other Plastic Other unlisted or specific polymers or plastic materials.