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Power transmission

Belts, Chains & Couplings replacement guide

Work from belt markings, measured length, chain designation, sprocket geometry, coupling details, and drive duty before selecting a replacement.

Evidence boundary. A dimensional match is only the first screen. Drive capacity, pulley or sprocket condition, alignment, and service factor still need verification.
Items covered01 · 18 component types
  • V-belts
  • Timing belts
  • Synchronous belts
  • Poly-V belts
  • Flat belts
  • Drive belts
  • Roller chain
  • Leaf chain
  • Silent chain
  • Sprockets
  • Sheaves
  • Pulleys
  • Jaw couplings
  • Grid couplings
  • Gear couplings
  • Disc couplings
  • Elastomeric couplings
  • Chain couplings
What to capture02
Marking, profile, pitch, and constructionRecord this before searching for a substitute.
Measured length, width, pitch, tooth count, or link countRecord this before searching for a substitute.
Chain pitch, roller diameter, strand, and sprocketRecord this before searching for a substitute.
Coupling bore, keyway, spacer, hub, and elementRecord this before searching for a substitute.
Speed, torque, alignment, tension, and environmentRecord this before searching for a substitute.
What must match03
Dimensional and profile matchConfirm it against the original equipment, duty, and source documentation.
Torque, speed, tension, 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 and allowable misalignmentConfirm it against the original equipment, duty, and source documentation.
Temperature, chemicals, guarding, and lubricationConfirm it against the original equipment, duty, and source documentation.
Common searches04
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 points05
Gates application specificationshttps://www.gates.com/us/en/knowledge-center/resource-library/application-specs.htmlGates product catalogshttps://www.gates.com/us/en/knowledge-center/resource-library/product-catalogs.html
Manufacturer-backed jaw coupling hub lookup498 Lovejoy UPC records
Lovejoy L Type jaw coupling hub UPC lookup

Browse exact Lovejoy hub UPC identities by L Type coupling size, bore, keyway, and imperial/metric table context from the current manufacturer jaw-coupling catalog.

Browse 498 Lovejoy L Type hubs →
Manufacturer-backed sprocket lookup389 Martin catalog records
Martin roller-chain sprocket catalog-number lookup

Browse exact Martin stock sprocket catalog numbers by ANSI chain designation, pitch, tooth count, material/style context, and source row.

Browse 389 Martin roller-chain sprockets →
Manufacturer-backed industrial V-belt lookup500 Optibelt records
Optibelt industrial V-belt part-number lookup

Browse exact Optibelt classical, wedge, fractional-horsepower, cogged, and metric belt identities with published profile, construction context, length, weight, and source-row provenance.

Browse 500 Optibelt V-belts →
Manufacturer-backed timing-belt lookup500 Gates PowerGrip records
Gates PowerGrip timing-belt part-number lookup

Browse exact Gates Series 9257 timing-belt part and product numbers with pitch, width, tooth count, pitch length, weight, and source-row provenance.

Browse 500 Gates PowerGrip timing belts →
Manufacturer-backed taper-bushed sheave lookup404 Martin catalog records
Martin Taper Bushed Hi-Cap wedge sheave lookup

Browse exact Martin 3V, 5V, and 8V taper-bushed sheave identities with groove count, pitch/outside diameter, taper-bushing number, and source-row provenance.

Browse 404 Martin taper-bushed sheaves →
Manufacturer-backed sheave lookup490 Martin Stock QD records
Martin QD Hi-Cap wedge sheave catalog-number lookup

Browse exact Martin 3V, 5V, and 8V Stock QD Hi-Cap sheave identities with groove count, published pitch/outside diameter, required QD bushing, and source-row provenance.

Browse 490 Martin QD Hi-Cap sheaves →
Related lookup guides2 workflows
measure V-belt for replacement

How to measure a V-belt for replacement

Measure the belt section and pitch length, confirm the sheave geometry, and verify the drive application before ordering.

Open guide →roller chain size replacement

How to identify roller chain size for replacement

Measure pitch, roller diameter, inside width, and link count, then compare the result with an ANSI or manufacturer chart.

Open guide →
Source-backed field guides2 guides
Belts & power transmission

V-belt replacement size

How to identify a replacement V-belt from its markings, section, length convention, pulley geometry, construction, and application duty.

Open guide →Belts, chains & couplings

Shaft coupling replacement

How to replace an industrial shaft coupling by verifying coupling type, both shaft interfaces, torque, speed, misalignment, spacing, duty, and environment.

Open guide →
Search the verified catalogIdentify an unknown part