Power Transmission

100+ products

Expected delivery: Tue, Nov 17

Parts that keep equipment turning: bearings and bushings, belts and pulleys, roller chain and sprockets, seals, O-rings and gaskets, springs, and motors, gears and couplings. Maintenance mechanics, millwrights and fleet shops use these power transmission parts to repair conveyors, pumps, fans, gearboxes and production machines.

How to choose replacement parts

  • Start with the old part number. Bearings, belts, seals and chain are usually marked with a standard size code. That code is often enough to find a direct match.
  • Measure when the marking is gone. Record bore, outside diameter and width for bearings and seals, and use a caliper rather than a tape. For belts, measure the top width and outside length.
  • Know the standard sizing systems. Roller chain uses ANSI numbers, where the first digit gives the pitch in eighths of an inch, so #40 chain has a 1/2 in. pitch. V-belts use section codes such as A, B, 3L, 4L and 5L, and AS568 dash numbers define standard O-ring sizes.
  • Match seal material to the fluid and heat. Nitrile (Buna-N) suits most oils and greases. FKM handles higher heat and many chemicals. EPDM is used for water and steam but not petroleum oils.
  • Replace wear parts as a set. Matched V-belts on a multi-groove drive, and chain with its sprockets, wear together and are usually replaced together.

Lockout and guarding come first on any drive. Follow the equipment manufacturer's instructions, OSHA requirements and your site's lockout program, and find lockout devices in first aid, signs and lockout.

If a part number will not match, send it to us for a quote and we will cross-reference it. Plants that keep bearings, belts and O-rings on hand for planned maintenance can stock them through vendor managed inventory.

Common questions

What do the numbers on a ball bearing mean?

In a common code like 6203, the first digits give the series and the last two give the bore. For bore codes 04 and up, multiply by 5 to get the bore in millimeters, so 6204 has a 20 mm bore. Suffixes such as 2RS (rubber seals) and ZZ (metal shields) describe the closures.

Can I replace a 4L belt with an A belt?

They have a similar top width, but 4L belts are made for light-duty fractional horsepower drives and A belts for industrial drives. Check the equipment maker's specification before substituting.

What is the difference between a bearing and a bushing?

A bearing uses rolling elements such as balls or rollers. A bushing is a plain sleeve, often bronze or plastic, that the shaft slides against, and it suits slower speeds and oscillating motion.

Power Transmission by type

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