Castair Replacement Industrial V-Belt — Section B, 52" Length (3-B52)
The Castair 3-B52 is a Section B V-belt at 52 inches outside circumference. This belt fits Castair compressor models using a B-section drive with a center distance requiring a 52-inch belt. Section B belts carry more power than Section A — use this belt only on compressors originally spec'd for B-section belts and the corresponding B-groove pulleys.
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Section B, 52" Belt Details
- Part Number: 3-B52
- Belt Section: B (21/32" top width, 13/32" depth)
- Outside Circumference: 52 inches
- Application: Castair compressors requiring Section B, 52" belt
- Price: $13.86
When to Use Section B vs. Section A
- Section B applications: Higher horsepower motors (typically 5 HP and above depending on design), higher torque drives, longer center distances that would flex a Section A belt excessively
- Do not substitute: A Section A belt in a B-groove pulley will bottom out in the groove and not transmit power correctly. A Section B belt in an A-groove pulley will not seat properly.
- Confirm before ordering: Check the compressor service manual or existing belt markings for the exact belt designation
Belt Installation Tips
- Never force a belt onto a pulley with a pry bar — loosen the motor slide base to reduce center distance, slip the belt on, then re-tension
- Tension to compressor specification — check deflection force with a belt tension gauge for accuracy
- After initial run-in (first hour of operation), re-check and re-set tension as the belt seats
Related Castair Section B Belt Sizes
- 3-B47 — 47"
- 3-B52 — 52" (this belt)
- 3-B112 — 112"
Technical Specifications
- Part Number: 3-B52
- Belt Section: B
- Outside Circumference: 52 inches
- Top Width: 21/32" (17mm nominal)
- Thickness: 13/32" (11mm nominal)
- Price: $13.86
Why Buy From OEM Diagnostic Tools?
- Specialist since 2016 in air compressor parts
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