Machine components
Gears, Shafts & Machine Elements replacement guide
Replace spur, bevel, miter, worm, rack-and-pinion components plus shafts, keys, collars, rod ends, U-joints, rollers, and related machine elements by exact geometry and duty.
Evidence boundary. Matching a gear diameter or shaft diameter is not enough. Pitch or module, pressure angle, tooth count, material, hub geometry, and mating components determine compatibility.
Items covered01 · 16 component types
- Spur gears
- Bevel gears
- Miter gears
- Worm gears
- Gear racks
- Pinions
- Machine shafts
- Keyed shafts
- Splined shafts
- Shaft collars
- Machine keys
- Universal joints
- Rod ends
- Machine rollers
- Hubs
- Shaft locking devices
What to capture02
Gear type, pitch or module, pressure angle, tooth count, and face widthRecord this before searching for a substitute.
Shaft diameter, length, material, keyway, spline, and threadRecord this before searching for a substitute.
Bore, hub, set-screw, clamp, or locking interfaceRecord this before searching for a substitute.
Center distance, mating component, rotation, and alignmentRecord this before searching for a substitute.
Torque, speed, load, material, hardness, and environmentRecord this before searching for a substitute.
What must match03
Tooth geometry and mating pitchConfirm it against the original equipment, duty, and source documentation.
Shaft and hub dimensionsConfirm it against the original equipment, duty, and source documentation.
Material, hardness, and surface treatmentConfirm it against the original equipment, duty, and source documentation.
Torque, speed, alignment, and bearing loadsConfirm it against the original equipment, duty, and source documentation.
Retention, key, spline, and installation detailsConfirm it against the original equipment, duty, and source documentation.
Common searches04
How do I identify a replacement gear?
What shaft replaces this one?
How do I match a gear rack and pinion?
What U-joint or rod end fits this machine?
Authoritative starting points05