Product · Rotary motion
V-Belt Pulleys
Custom-bore V-belt pulleys (sheaves) in all standard groove profiles — SPZ, SPA, SPB, SPC.
We machine V-belt pulleys (sheaves) from castings or steel bar — your bore, your keyway, your groove count, your finish. Narrow SPZ / SPA / SPB / SPC sections ship to drawing, plain-bore or taper-bushed; non-standard groove geometry is quoted from your belt supplier's spec.
Last updated Reviewed by Luo Genwen, Production Plant Manager
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Smallest narrow-wedge section (SPZ), taper-bushing (Taper-Lock) mounted, keyless quick-fit, high power per width. Suited to compact, low-to-medium-power high-speed drives.
SPA narrow-wedge pulley, taper-bushing mounted; power and size between SPZ and SPB. Suited to fans, pumps and compressors — general power transmission.
SPB narrow-wedge pulley, taper-bushing mounted; higher capacity, multi-groove capable. Suited to medium-to-high-power fans, pumps and industrial drives.
SPC narrow-wedge pulley — largest section, highest capacity, multi-groove for high power. Suited to high-power, heavy-duty drives.
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Sections
SPZ / SPA / SPB / SPC
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OD range
Ø30 mm – Ø500 mm
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Grooves
Single & multi-groove
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Tolerance
ISO H7 bore · concentricity ≤ 0.03 mm
What we make
V-Belt Pulleys we cut from drawings.
Narrow SPZ / SPA / SPB / SPC
Modern wedge sections — more power per width
Taper-Bushed Pulleys
Taper-Lock / QD bores — mount without a press
Multi-groove sheaves
Two to eight grooves for higher-power drives
Idler pulleys
Smooth or crowned face, with bearing bores
V-belt pulleys drive the fans, pumps, compressors, and conveyors that keep plants running. Groove geometry decides belt life: a wrong groove angle or a rough flank can burn through a belt set in months, and an out-of-round sheave shakes the whole drive.
Every sheave is machined from a casting or from steel bar; bore-to-groove concentricity is held to ≤ 0.03 mm and groove angles are gauged to DIN 2211 / ISO 4183. Sheaves ship plain-bore with keyway, or bored for Taper-Lock / QD bushings.
For drives that need balancing — high-speed fans, large-diameter sheaves — we balance on request and ship the report. Want it ready to mount? We supply the sheave with its matching taper bushing as a set.
Standards
Built to international tolerance specs.
- ISO 4183 (groove dimensions)
- DIN 2211 (narrow-wedge sheaves)
Inspection
Every part measured before it ships.
- CMM — bore concentricity, groove runout
- Groove-angle and pitch-diameter gauges
- Surface roughness tester
- Bore go / no-go gauges
Applications
Where these parts go to work.
FAQ
Common questions from engineers buying this product.
Can you copy an obsolete OEM pulley?
Yes — send the worn part. We scan it on the CMM, identify the groove profile, and build a CAD pack. You get a first article in ~10 working days.
What is the minimum order quantity?
One. We routinely make single-unit replacement sheaves for OEMs whose original supplier has discontinued the part.
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Often quoted together.
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View product →Ready to start your V-belt pulleys project?
24-hour quote · engineering review within one business day · ≤ 30 days to ship after approval.