Cogged V-belts (also called raw edge or notched V-belts) are an upgraded version of classical wrapped V-belts that use the same cross-section dimensions and fit the same sheave grooves. The key difference is construction: cogged belts have raw (uncovered) rubber sidewalls and molded notches on the underside that increase flexibility, improve heat dissipation, and allow the belt to wrap around smaller sheave diameters than wrapped belts can handle.
Cogged V-belts are designated with an "X" suffix added to the classical section letter: AX, BX, CX. They are a direct drop-in replacement for A, B, and C classical belts with no sheave changes required. Texas Belting stocks cogged V-belts from Gates, Continental, Bando, and Diesel Belting.
Why Choose Cogged Over Wrapped?
Cogged V-belts outperform classical wrapped belts in almost every measurable category while fitting the same sheaves. The cog design and raw edge sidewalls provide five specific advantages:
Greater flexibility
The molded notches on the underside reduce bending resistance, allowing the belt to flex more easily around sheaves. This is especially important on drives with small-diameter sheaves where wrapped belts run at or near their minimum bend radius.
Better heat dissipation
The cog pattern increases the belt's surface area and allows air to circulate between the notches. The raw (uncovered) rubber sidewalls also conduct heat away from the belt core more effectively than the fabric cover on wrapped belts.
Higher efficiency
Reduced bending resistance means less energy is lost to internal belt flexing with each revolution. Cogged belts typically run 1% to 2% more efficiently than wrapped belts, which adds up over continuous operation.
Longer service life
Less heat buildup, lower bending stress, and better sidewall grip combine to extend belt life by 20% to 30% on most drives, and more on high-speed or small-sheave applications where wrapped belts degrade fastest.
Better sidewall grip
Raw edge rubber sidewalls make direct contact with the sheave groove walls, providing a higher coefficient of friction than the fabric-covered sidewalls of wrapped belts. This reduces slippage under load.
Smaller sheave capability
The increased flexibility allows cogged belts to operate on sheaves smaller than the minimum recommended for wrapped belts of the same section, enabling more compact drive designs.
Cogged V-Belt Cross Section Dimensions
Cogged V-belts share identical cross-section dimensions with their classical counterparts. The "X" suffix indicates cogged construction, not a different size.
| Cogged Section | Replaces | Top Width | Depth | HP Range | Min. Sheave OD |
|---|---|---|---|---|---|
| AX | A (classical) | 1/2" (12.7 mm) | 5/16" (8 mm) | 1/4 to 10 HP | 2.2" (smaller than A's 3.0") |
| BX | B (classical) | 5/8" (16 mm) | 13/32" (10.5 mm) | 1 to 25 HP | 4.0" (smaller than B's 5.4") |
| CX | C (classical) | 7/8" (22 mm) | 17/32" (13.5 mm) | 15 to 100 HP | 7.0" (smaller than C's 9.0") |
How to Read a Cogged V-Belt Part Number
Cogged V-belt part numbers follow the same format as classical belts, with "X" inserted after the section letter.
| Part Number | Section | Inside Length | Classical Equivalent |
|---|---|---|---|
| AX45 | AX (cogged A) | 45" | A45 |
| BX62 | BX (cogged B) | 62" | B62 |
| BX100 | BX (cogged B) | 100" | B100 |
| CX120 | CX (cogged C) | 120" | C120 |
Conversion is simple: To upgrade from a classical belt to a cogged belt, take your existing part number and insert "X" after the section letter. B68 becomes BX68. A45 becomes AX45. The inside length stays the same because the cross-section dimensions are identical.
The same OC-to-inside-length conversion applies: measure outside circumference and subtract the section factor (A/AX subtract 2, B/BX subtract 3, C/CX subtract 4).
When to Choose Cogged V-Belts
| Situation | Recommendation | Why |
|---|---|---|
| Replacing a classical belt on any drive | Cogged recommended | Direct replacement with better performance. No reason not to upgrade unless cost is the only concern. |
| Drive with small sheaves at or near minimum diameter | Cogged strongly recommended | Cogged belts handle smaller diameters. Classical belts at minimum sheave size fail prematurely. |
| High-speed drives (3,600+ RPM motor) | Cogged strongly recommended | Better heat dissipation prevents the internal temperature buildup that shortens wrapped belt life at high speed. |
| Drives in hot environments (near ovens, boilers, etc.) | Cogged strongly recommended | Superior heat dissipation from cog pattern and raw edge sidewalls. |
| Energy efficiency improvement project | Cogged recommended | 1% to 2% efficiency gain per belt. Meaningful savings across multiple drives over continuous operation. |
| Reciprocating compressor drives | Cogged recommended | Pulsating loads create heat spikes. Cogged belts dissipate this heat more effectively. |
| Budget-limited, non-critical, low-hour drive | Classical acceptable | If the drive runs infrequently and cost is the sole priority, classical wrapped is adequate. |
Cogged Classical (AX, BX, CX) vs. Cogged Narrow Wedge (3VX, 5VX, 8VX)
Both are cogged (raw edge, notched) belts, but they use different cross-section profiles and different sheave grooves. They are not interchangeable.
| Feature | Cogged Classical (AX, BX, CX) | Cogged Narrow Wedge (3VX, 5VX, 8VX) |
|---|---|---|
| Cross section | Classical profile (wider, shallower) | Narrow wedge profile (deeper, narrower) |
| Sheave groove | Classical groove (A, B, C sheaves) | Narrow wedge groove (3V, 5V, 8V sheaves) |
| Power per belt | Standard classical rating | Higher. Narrow profile transmits more power per belt. |
| Replaces | A, B, C wrapped belts (same sheaves) | 3V, 5V, 8V wrapped belts (same sheaves) |
| Best for | Upgrading existing classical drives without changing sheaves | Upgrading existing narrow wedge drives, or new compact drive designs |
If your existing sheaves are classical groove (A, B, or C), use AX, BX, or CX cogged belts. If your sheaves are narrow wedge groove (3V, 5V, 8V), use 3VX, 5VX, or 8VX cogged narrow belts. Check the sheave groove profile if you are unsure. See our V-Belt Selection Guide or Sheave Selection Guide for help identifying your sheave type.
Common Applications for Cogged V-Belts
| Application | Typical Section | Why Cogged |
|---|---|---|
| HVAC air handlers and blowers | AX, BX | Continuous duty, often in warm mechanical rooms. Cogged runs cooler and lasts longer. |
| Reciprocating air compressors | BX, CX | Pulsating loads generate heat. Cogged handles thermal cycling better than wrapped. |
| Centrifugal pumps | AX, BX | Steady load, continuous operation. Longer belt life reduces pump downtime. |
| Industrial fans and blowers | BX, CX | High-speed rotation. Cogged dissipates heat from belt flex at speed. |
| Agricultural equipment | AX, BX, CX | Dusty, hot field conditions. Cogged resists heat buildup in adverse environments. |
| Woodworking machinery | AX, BX | Table saws and planers often use small motor sheaves. Cogged handles tighter bends. |
| Conveyor drives (general) | BX, CX | Continuous duty, start/stop cycling. Cogged belt handles repeated flex without cracking. |
| Machine tools (lathes, mills) | AX, BX | Compact drives with small sheaves. Cogged flexibility prevents premature cracking. |
Cogged V-Belt Brands We Carry
- Gates: PowerRated and Hi-Power II cogged V-belts in AX, BX, CX sections. Full length range.
- Continental (ContiTech): Cogged classical V-belts. Direct cross-reference to Gates.
- Bando: Power Ace cogged V-belts. AX, BX, CX sections.
- Diesel Belting: Cogged V-belts at competitive pricing. AX, BX, CX stocked.
We cross-reference cogged V-belt part numbers across all brands. AX45 from Gates, Continental, Bando, and Diesel Belting are all the same physical belt on the same sheaves. Call 888-203-2358 with any part number.
Frequently Asked Questions
A cogged V-belt (also called a raw edge or notched V-belt) has molded notches on its underside and uncovered rubber sidewalls, unlike classical wrapped belts which have a smooth underside and fabric covering on all surfaces. The cogs increase flexibility and heat dissipation, while the raw edge sidewalls provide better grip in the sheave groove. Cogged belts are designated with an "X" suffix: AX, BX, CX.
Yes. Cogged V-belts (AX, BX, CX) have identical cross-section dimensions to their classical counterparts (A, B, C) and fit the same sheave grooves. Simply replace B68 with BX68. No sheave changes, no drive modifications. The cogged belt drops right in.
On most drives, cogged belts last 20% to 30% longer than wrapped belts of the same section. The improvement is even greater on drives with small sheaves, high speeds, or elevated temperatures where the flexibility and heat dissipation advantages of cogs have the most impact. The longer life typically offsets the slightly higher belt cost.
No. Cogged V-belts use a V-shaped cross section with notches on the underside for flexibility. They transmit power through friction in sheave grooves. Timing belts have toothed profiles that mesh with pulleys for positive, no-slip engagement. The notches on a cogged V-belt are not teeth and do not engage the sheave. They look similar at a glance but function completely differently. See our Timing Belt vs V-Belt comparison for a full breakdown.
Cogged belts typically cost 10% to 20% more than wrapped belts of the same section and length. However, the longer service life (20-30% on most drives) and improved efficiency (1-2%) generally result in lower total cost of ownership over time. The payback is fastest on drives that run continuously or in demanding conditions.
Yes. Texas Belting stocks the most popular AX, BX, and CX cogged V-belt sizes at our Houston warehouse. In-stock belts ship same day when ordered before the daily cutoff. For less common lengths, lead time is typically 1 to 3 business days. Call 888-203-2358 to check availability on your specific part number.
V-Belt Drive Components
Cogged V-belts use the same sheaves as their classical counterparts. The sheave groove section must match the belt section (A/AX, B/BX, C/CX). Browse our V-belt drive components, or see our Sheave Selection Guide for help choosing the right one.
Related Pages
Need a Cogged V-Belt?
Texas Belting stocks AX, BX, and CX cogged V-belts from Gates, Continental, Bando, and Diesel Belting. Same sheaves as your classical belts, better performance. Send us your part number or add "X" to your existing classical part number.
Request a Quote Call 888-203-2358
