Power transmission
Belts, Chains & Couplings replacement guide
Work from belt markings, measured length, chain designation, sprocket geometry, or coupling details before selecting a replacement.
Evidence boundary. Belt and transmission pages will separate a dimensional match from an application recommendation. A belt that measures correctly is not automatically suitable for the same duty.
What to capture01
Marking, profile, and constructionRecord this before searching for a substitute.
Measured length, width, pitch, or tooth countRecord this before searching for a substitute.
Chain pitch, roller diameter, and strandRecord this before searching for a substitute.
Coupling bore, keyway, spacer, and elementRecord this before searching for a substitute.
Speed, torque, alignment, and environmentRecord this before searching for a substitute.
What must match02
Dimensional and profile matchConfirm it against the original equipment, duty, and source documentation.
Torque, speed, and service factorConfirm it against the original equipment, duty, and source documentation.
Sheave, sprocket, and hub geometryConfirm it against the original equipment, duty, and source documentation.
Alignment, tension, and allowable misalignmentConfirm it against the original equipment, duty, and source documentation.
Temperature, chemicals, and guardingConfirm it against the original equipment, duty, and source documentation.
Common searches03
How do I measure a replacement V-belt?
What belt matches this marking?
How do I identify roller chain size?
What information is needed for a coupling replacement?
Authoritative starting points04