... , and trailers2) Spur gears, bevel gears, helical gears, worm gears, face gears, gear levels3) Standards: ASTM, DIN, EN, BS, JIS, ISOa1 ... GEAR products including spur gears, bevel gears, helical gears, wormgears, face gears and gear levels, are widely used in such fields ... of teeth, outside and inside diameters, thickness) Double Gear(ISO/TS approved)