... , buses, tractors, and trailers2) Spur gears, bevel gears, helical gears, worm gears, face gears, gear levels3) Standards: ASTM, DIN, EN, BS, JIS ... services worldwide.2, Our quality GEAR products including spur gears, bevel gears, helical gears, wormgears, face gears and gear levels, are widely used ... service (model, number of teeth, outside and inside diameters, thickness) Double Gear(ISO/TS approved)