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