Specifications
Precision grade JIS grade N9 (JIS B1702-1: 1998) ＊ JIS grade 5 (JIS B1702: 1976)
Reference
portion of gear Normal plane
Gear teeth Standard full depth
Normal
pressure angle 20°
Helix angle 45°
Material Acetal Acetal can be a stable plastic material with Plastic Screw Gears inherent self-lubricating properties that can be improved with lubricating fillers.
Delrin Delrin is an 
engineered plastic-type with a good mixture of toughness, stiffness, use 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 challenging and resistant and has great pressure ratings.
Polycarbonate Polycarbonate can be 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 some other polymers.
Other Plastic Other unlisted or specific polymers or plastic materials.