Castair Replacement Industrial V-Belt — Section A, 64" Length (3-A64)
The Castair 3-A64 is a Section A V-belt at 64 inches outside circumference, used on Castair compressor models with a larger motor-to-pump center distance than the shorter A-series belts cover. The 64-inch length is typically associated with larger frame single or dual-stage compressor configurations. Confirm your compressor's belt spec — check the service manual or measure the old belt — before ordering.
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Section A, 64" Belt Details
- Part Number: 3-A64
- Belt Section: A (1/2" top width, 5/16" depth)
- Outside Circumference: 64 inches
- Application: Castair belt-drive reciprocating compressors
- Price: $11.09
Belt Replacement Best Practices
- Always replace all belts on a multi-belt drive at the same time — a new belt running with worn belts will carry unequal load and wear prematurely
- Check pulley alignment before installing a new belt — misaligned pulleys will destroy a belt quickly regardless of quality
- Set tension per compressor manufacturer spec: typically 1/2" deflection per foot of belt span under moderate thumb pressure
- Run the compressor for 15-20 minutes after initial installation, then re-check tension — belts seat into the pulley groove during break-in and may loosen slightly
Related Castair Section A Belt Sizes
- 3-A48 — 48"
- 3-A52 — 52"
- 3-A64 — 64" (this belt)
- 3-A67 — 67"
Technical Specifications
- Part Number: 3-A64
- Belt Section: A
- Outside Circumference: 64 inches
- Top Width: 1/2" (13mm nominal)
- Thickness: 5/16" (8mm nominal)
- Price: $11.09
Why Buy From OEM Diagnostic Tools?
- Specialist since 2016 in air compressor components
- Free shipping on qualifying orders
- Free tech support at 866-217-0063
- Full manufacturer warranty
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