3V is the lightest narrow wedge V-belt section, with a 3/8" top width and 5/16" depth. It covers drives from 1/2 HP to approximately 25 HP and is the narrow wedge equivalent of the A section classical belt. A single 3V belt transmits more power than a single A belt, and the smaller minimum sheave diameter allows more compact drive designs. 3V belts are widely used in HVAC, small pumps, OEM equipment, and light industrial drives where space and efficiency matter.
Texas Belting stocks 3V narrow wedge V-belts in both wrapped (3V) and cogged (3VX) construction from Gates, Continental, Bando, and Diesel Belting. Same-day shipping on stocked lengths from Houston.
3V (Wrapped) vs. 3VX (Cogged)
| Feature | 3V (Wrapped) | 3VX (Cogged) |
|---|---|---|
| Construction | Fabric cover on all surfaces | Raw edge sidewalls, molded cogs on underside |
| Minimum sheave OD | 2.65" | 2.2" (allows very small sheaves) |
| Flexibility | Standard | Higher. Important on small-sheave compact drives. |
| Heat dissipation | Standard | Better. Cogs increase cooling surface area. |
| Service life | Standard | 20-30% longer on most drives |
| Efficiency | Standard | 1-2% higher |
| Cost | Lower | 10-20% higher (offset by longer life) |
| Sheave | 3V groove | Same 3V groove. Fully interchangeable. |
Recommendation: 3VX cogged is the better choice for most 3V applications. The 2.2" minimum sheave (vs. 2.65" for wrapped 3V) is particularly valuable on the compact, small-sheave drives where 3V is most commonly used.
3V vs. A Section vs. 3L: Which Do You Have?
Three V-belt sections share overlapping dimensions at the 3/8" to 1/2" width range. Understanding the difference prevents ordering the wrong belt.
| Feature | 3L (FHP) | 3V (Narrow Wedge) | A (Classical) |
|---|---|---|---|
| Top width | 3/8" | 3/8" | 1/2" |
| Depth | 7/32" (shallowest) | 5/16" (deeper than 3L) | 5/16" (same depth as 3V, wider) |
| HP range | Under 1/2 HP | 1/2 to 25 HP | 1/4 to 10 HP |
| Sheave groove | 3L/FHP groove | 3V groove | A groove |
| Part number system | OC x 10 (e.g., 3L350) | OC x 10 (e.g., 3V355) | Inside length (e.g., A68) |
| Interchangeable? | None of these three are interchangeable. All use different sheave grooves. | ||
| Best for | Very light duty, small appliances | Compact industrial, HVAC, OEM | General light industrial |
3V Part Number Guide
3V part numbers use outside circumference multiplied by 10, same as all narrow wedge sections.
| Part Number | Type | Outside Circumference |
|---|---|---|
| 3V265 | Wrapped | 26.5" |
| 3VX265 | Cogged | 26.5" |
| 3V355 | Wrapped | 35.5" |
| 3VX355 | Cogged | 35.5" |
| 3V500 | Wrapped | 50.0" |
| 3VX500 | Cogged | 50.0" |
| 3V600 | Wrapped | 60.0" |
| 3V710 | Wrapped | 71.0" |
| 3VX710 | Cogged | 71.0" |
| 3V800 | Wrapped | 80.0" |
| 3V1000 | Wrapped | 100.0" |
| 3V1120 | Wrapped | 112.0" |
How to calculate: Wrap a tape around the top surface of the belt. Multiply by 10. OC 35.5" becomes 3V355 (wrapped) or 3VX355 (cogged). To upgrade from wrapped to cogged, insert "X": 3V500 becomes 3VX500. Same sheave, same length.
Common Applications for 3V V-Belts
| Application | Typical HP | 3V or 3VX? |
|---|---|---|
| HVAC air handlers (residential and light commercial) | 1/2 to 5 HP | Either. 3VX preferred for warm mechanical rooms. |
| Small centrifugal pumps | 1 to 10 HP | Either. 3VX for continuous duty. |
| Small air compressors | 1 to 10 HP | 3VX recommended. Pulsating load benefits from cogged heat handling. |
| OEM machine drives | 1/2 to 15 HP | 3VX is the preferred OEM specification for compact drive layouts. |
| Small industrial fans | 1 to 10 HP | Either. 3VX for high-speed and continuous operation. |
| Packaging equipment (auxiliary drives) | 1/2 to 5 HP | 3VX for compact packaging machine enclosures. |
| Light conveyors | 1 to 10 HP | Either. 3VX for start/stop cycling. |
| Cooling tower fans (small) | 1 to 10 HP | 3VX recommended. Humid environment, continuous duty. |
| Machine tools (small lathes, mills) | 1 to 5 HP | 3VX for small motor sheaves. |
When to Use 3V vs. A vs. 5V
| Situation | Best Choice | Why |
|---|---|---|
| Replacing an A belt on existing A-groove sheaves | A or AX | Matches existing sheaves. No hardware change needed. AX for better performance. |
| Designing a new drive under 25 HP, space is tight | 3V or 3VX | Smallest narrow wedge section. Most compact sheaves. More power per belt than A. |
| Replacing A sheaves anyway (worn or upgrading) | 3V or 3VX | Take the opportunity to switch to narrow wedge for better performance. |
| Drive exceeds 3V capacity (over 25 HP) | 5V or 5VX | Next size up. 5V covers 10 to 100 HP. |
| Very light duty, under 1 HP, appliance or small motor | 3L or 4L (FHP) | FHP belts are sufficient for sub-1 HP. Less expensive than 3V. |
| Multi-belt A drive with 2+ A belts | 1 x 3V or 3VX (with new sheaves) | A single 3V replaces two A belts. Simpler, more compact. |
See our V-Belt Selection Guide for more help choosing between belt types and sections.
3V V-Belt Brands We Carry
- Gates: Tri-Power and Super HC narrow wedge belts. 3V and 3VX. Full length range. Also available in PowerBand (banded) configuration.
- Continental (ContiTech): Narrow wedge V-belts. 3V and 3VX sections. Direct cross-reference to Gates.
- Bando: Power Ace narrow wedge. 3V and 3VX.
- Diesel Belting: Narrow wedge V-belts at competitive pricing.
We cross-reference 3V part numbers across all brands. Call 888-203-2358 with any part number.
Frequently Asked Questions
3V V-belts are 3/8" (9.5 mm) top width and 5/16" (8 mm) deep. This is the lightest narrow wedge section, covering 1/2 HP to approximately 25 HP. 3VX cogged belts have the same dimensions with raw edge sidewalls and molded cogs.
No. Both are 3/8" wide but 3V is 5/16" deep while 3L is only 7/32" deep. 3V is an industrial narrow wedge belt for drives up to 25 HP. 3L is an FHP (fractional horsepower) belt for drives under 1/2 HP. They use different sheave grooves and are not interchangeable. Check the depth to distinguish them.
Measure the outside circumference (OC) and multiply by 10. A 3V belt measuring 35.5" OC is a 3V355 (wrapped) or 3VX355 (cogged).
3VX cogged is the better choice for most applications. It handles smaller sheaves (2.2" vs. 2.65" minimum), runs cooler, and lasts 20-30% longer. On the compact drives where 3V is most commonly used, the small-sheave advantage of 3VX is particularly valuable. The slight cost premium is offset by longer belt life.
When the drive's design HP exceeds 3V capacity (approximately 25 HP per belt). Also consider 5V when you need a wider belt for higher torque or when the service factor pushes the design HP above the 3V range. 5V covers 10 to 100 HP and uses larger sheaves.
Yes. Texas Belting stocks the most popular 3V and 3VX lengths at our Houston warehouse. In-stock belts ship same day. Less common lengths ship in 1 to 3 business days. Call 888-203-2358 to check availability on your specific length.
V-Belt Drive Components
3V and 3VX belts require 3V-groove sheaves. These are not interchangeable with A-groove or 3L-groove sheaves. Browse our V-belt drive components, or see our Sheave Selection Guide for help choosing the right one.
Related Pages
Need a 3V or 3VX V-Belt?
Texas Belting stocks 3V and 3VX narrow wedge V-belts from all major brands for compact industrial drives. Send us your part number or outside circumference.
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