Castair Replacement Industrial V-Belt — Section A, 52" Length (3-A52)
The Castair 3-A52 is a Section A industrial V-belt with a 52-inch outside circumference. If you are replacing the drive belt on a Castair compressor that takes a Section A, 52" belt, this is the OEM replacement. The 52-inch length fits compressor models with a slightly wider motor-to-pump center distance than the 48-inch version — confirm your model's belt spec before ordering.
Manufacturer page data was not available for this listing. Specifications are based on the industry-standard belt designation. Call 866-217-0063 to confirm fitment.
Section A V-Belt — What You Need to Know
Belt Cross-Section Specifications
- Section A Profile: 1/2" top width, 5/16" depth — the standard mid-range industrial V-belt cross section
- 52" Outside Circumference: Measure your existing belt around the outside to confirm this is the right length
- Part Number: 3-A52 (Castair catalog) / A52 (industry standard call-out)
- Application: Belt-drive reciprocating air compressors in the Castair A-series product line
Matching Belt to Compressor
- The correct belt length is determined by the center-to-center distance between the motor and pump pulleys
- An incorrect belt length will either not fit over the pulleys, or will run too loose and slip
- Always verify belt length by checking the service manual or measuring the old belt before ordering
- Section A and Section B belts are NOT interchangeable even if lengths match — the pulley groove profile must match the belt section
When to Replace
- Cracking or checking on the belt surface: Replace before failure
- Belt slipping under load: Can be tension or belt condition — inspect the belt surface when adjusting tension
- Frayed sidewalls or exposed cord: Replace immediately
- Preventive maintenance: Inspect every 500 hours; replace every 1,000-2,000 hours on continuous-duty machines
Related Castair Section A Belt Sizes
- 3-A48 — 48" outside circumference
- 3-A52 — 52" (this belt)
- 3-A64 — 64"
- 3-A67 — 67"
Technical Specifications
- Part Number: 3-A52
- Belt Section: A
- Outside Circumference: 52 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 parts
- Free shipping on qualifying orders
- Free tech support at 866-217-0063 — confirm fitment before ordering
- Full manufacturer warranty on Cast Air parts
Call 866-217-0063 for quick answers and help!
