Castair Replacement Industrial V-Belt — Section B, 112" Length (3-B112)
The Castair 3-B112 is a Section B V-belt at 112 inches outside circumference — the longest belt in the standard Castair replacement range. At 112 inches, this belt is used on large-frame industrial compressors where the motor and pump are mounted with a significant center distance. This is not a typical shop compressor belt; it is a heavy industrial component for large stationary systems. If your application requires this length, you know what you are running.
Manufacturer page data was not available for this listing. Call 866-217-0063 to verify fitment before ordering.
Why This Belt Is Different
Large-Frame Drive Applications
- 112" outside circumference: More than double the length of the typical shop compressor belt — this is for large industrial reciprocating compressors, often with base-mounted motor configurations where the motor sits at distance from the pump
- Section B cross-section: Higher torque capacity than Section A — essential at this belt length where the drive is transmitting significant horsepower
- Part Number: 3-B112 (Castair) / B112 (industry standard designation)
- Price: $32.34 — reflects the longer belt length versus the shorter B-section belts
Section B Specifications
- Top Width: 21/32" (17mm nominal)
- Depth: 13/32" (11mm nominal)
- Belt angle: 40-degree included angle (standard V-belt)
- Compatible with standard B-groove pulleys
Ordering and Fitment Notes
- Measure the outside circumference of your existing belt before ordering — at 112 inches, being off by even 4-5 inches means the belt will not tension correctly
- If you are unsure of the belt length, write down the existing belt markings (e.g., "B112" or "B-112") — that is the industry-standard designation
- For multi-belt drives, order the same quantity of new belts as the original configuration — do not mix old and new
Related Castair Section B Belt Sizes
- 3-B47 — 47"
- 3-B52 — 52"
- 3-B112 — 112" (this belt)
Technical Specifications
- Part Number: 3-B112
- Belt Section: B
- Outside Circumference: 112 inches
- Top Width: 21/32" (17mm nominal)
- Thickness: 13/32" (11mm nominal)
- Price: $32.34
Why Buy From OEM Diagnostic Tools?
- Specialist since 2016 in air compressor components and industrial parts
- Free shipping on qualifying orders
- Free tech support at 866-217-0063 — confirm belt spec and quantity for your system before ordering
- Full manufacturer warranty on Cast Air parts
Call 866-217-0063 for quick answers and help!
