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A V-Belt Size Chart 15″-200″ 13x8mm ISO 4184 for Industrial Machinery

The smallest classical V-belt section and the one most often overlooked — yet it runs more machines than any other. 1/2 inch top width, 8 mm height, 40° included angle. Built with a natural rubber body, polyester tension cord and a wrapped fabric jacket for agricultural implements, HVAC blowers, printing presses, oil presses, food and grain equipment, conveyors, pumps, compressors and more.

A V-belt product view, natural rubber wrapped belt, 13x8mm profile, black industrial drive belt

✂ ISO 4184 Compliant
⚡ 95%+ Efficiency
💪 30 m/s Max
🌄 -30 to +70°C
📦 MOQ 100 pcs
🚚 Delivery 15-20 Days

»Datum length in inches. A100 = 100-inch datum length. Read the code on the old belt back and order that number — the new belt seats in the same A-groove sheave.

What Is an A V-Belt

The smallest classical section — but the one that keeps more equipment running than any other belt in the plant.

The A V-Belt is a classical wrapped V-belt with a 1/2 inch (12.7 mm) top width, an 8 mm section height and a 40° included angle. It is the narrowest and most common of the classical sections: small enough for fractional-horsepower drives, capable enough to carry serious load when run in matched sets. On a properly aligned drive it wedges into the sheave groove and grips harder as load rises, transferring motor power with minimal slip.

Our A V-Belt uses the same construction as the rest of our natural-rubber classical range: a premium-grade natural rubber body, polyester tension cords and a wrapped fabric jacket. Moulded production keeps every belt of the same code to the same datum length, so a replacement ordered six months later sits in the same groove as the original set and shares load evenly in a matched drive.

Every belt conforms to ISO 4184. Datum length, cross-section and matched-set tolerance follow the international standard, not a private factory drawing. When your fitter reads “A100” on a worn belt, they can order “A100” from us and trust the seat.

Complete Technical Specifications

Classical A section, verified to ISO 4184. Values are nominal, within standard manufacturing tolerance.

Section

A Section

Top Width

1/2″ / 12.7 mm

Section Height

8 mm

Included Angle

40°

Body Compound

Natural Rubber

Tension Cord

Polyester

Outer Cover

Wrapped Fabric

Standard

ISO 4184

Efficiency

95%+

Max Speed

30 m/s

Temperature

-30 to +70°C

Fatigue Life

Millions of cycles

Length Marking

Datum length, inches

Range

A10–A250

Standard Sizes

241

Materials & Construction

Three layers, each doing one job. No filler, no shortcut.

🔧Tension Cord

High-tenacity polyester fibre, adhesive-treated and pre-tensioned during curing. Very low elongation under load, so the belt holds datum length and the drive stays tuned after break-in.

🏙Body Compound

High-strength natural rubber, fibre-reinforced. Absorbs shock loads from starting under full charge, resists compression cracking on working pulleys, and keeps its cross-section through continuous running.

📦Wrapped Jacket

Square-woven cotton-polyester fabric, rubber-impregnated, wrapped around the full belt. Raises sidewall friction, resists abrasion, flour and grain dust, and meets anti-static requirements for industrial drives.

Material boundary worth knowing: A section uses natural rubber (NR). It is not oil-resistant. Our chloroprene range — 3V/5V/8V/SPZ/SPB/SPC — carries oil, heat, cold, aging, acid and alkali resistance. If your drive sees oil splash, chemical contact or sustained high ambient heat, ask us about the chloroprene range instead.

Why Buyers Choose This A V-Belt

Written for the person who buys the belt, not the catalogue writer.

1 Cost-Effective by Design

The smallest classical section, priced for high-volume replacement programmes and matched-set orders — without giving up moulded length accuracy.

2 ISO-Compliant, Batch After Batch

Moulded to datum length under ISO 4184 matched-set tolerance. A replacement ordered later drops into the existing set without re-machining the centre distance.

3 Wear-Proof in Continuous Run

In bench testing under rated load, measured flank wear stays below 2% after 1,000 hours of continuous running. On a line that runs two shifts, that is the difference between a planned changeout and an unplanned stoppage.

4 Stretch-Resistant Cord Line

Pre-tensioned polyester holds datum length. The belt does not go slack after break-in, so re-tensioning stays rare and bearing load stays where it should be.

5 Slip-Resistant Grip

The wrapped jacket bites into the A-groove. When load spikes at start-up, the belt stays seated instead of skating across the sheave and cooking itself.

6 Vibration-Free Transfer

Smooth power hand-off cuts resonance through the shaft and bearing housing — important on printing presses, packaging machines and textile auxiliaries.

7 Torque-Stable Under Load

The wedge action means grip rises with torque. Start-up shock is absorbed by the natural rubber cushion, not dumped into the shaft.

8 Long-Lifespan Compound

High-tenacity natural rubber with anti-aging fillers. Shelf life is years when stored away from direct sun and ozone; service life is measured in seasons, not weeks.

9 Energy-Efficient Transfer

At 95%+ transmission efficiency, more motor output reaches the driven shaft. Across a plant full of small drives, that gap shows up on the power bill.

10 Low-Maintenance, Easy Field Swap

No lubrication, no tensioning every morning. A fitter can change a belt in minutes with a centre-distance adjustment and a tension gauge.

Industries & Equipment Served

A section is specified across printing, grain & oil, agriculture, steel, textiles, paper, ceramics and petrochemicals — plus every light industrial drive in between.

Printing Industry

Offset printing presses and all auxiliary equipment. Smooth, vibration-free transfer protects register and print quality on long press runs.

Grain, Oil & Food Processing

Oil presses and their auxiliaries, plus grain handling, conveying, cleaning and grading lines. Flour and grain dust are normal conditions, not exceptions.

Agricultural Machinery

Planters, rotary tillers, mowers, rice mills, mini-tillers, fertiliser spreaders, husking machines, grain grading screens, cleaning screens, ditch diggers and pruning machines. Outdoor UV, dust and shock loads all year round.

Steel & Metallurgy

Auxiliary drives across grinding, planing, drilling, sawing and shearing lines. Compact A-groove sheaves fit tight spaces on machine tool ancillaries.

Textile Industry

Auxiliary equipment throughout textile production. Vibration-free running protects downstream processes.

Paper Industry

Auxiliary drives on pulp, washing, refining and chipping lines. Quiet, low-vibration transfer is valued on finishing and converting equipment.

Ceramics & Petrochemical

Auxiliary drives on ceramic grinding and screening lines, and on petrochemical oil pumps, extractors, dryers, industrial refrigeration, extruders, pelletisers and blow moulders.

HVAC & General Industrial

Air-handling unit fans, blowers, air compressors, water pumps, conveyors, woodworking saws, lathes, packaging machines, printing presses and small machine tools. If an A-groove sheave is on the machine, this is the belt.

Auxiliary Equipment Across All Sectors

Fans, electric motors, gear reducers, mixers, air compressors, pumps and pulverizers — the everyday drives that stop production the moment a belt lets go.

A V-belts driving a grain handling and food processing machine pulley in factory

Reading the A-Code & Matched Sets

An A V-Belt code reads as A followed by the datum length in inches. So A100 has a datum length of 100 inches. This is not the inside length and not the outside circumference — our A section is marked by datum length per ISO 4184.

Because the belts are moulded to a consistent datum length, every belt in a multi-belt set carries the same share of load. A common failure pattern is one new belt paired with several worn belts: the new belt runs tight, takes almost all the tension and fails in days. Replacing the full set is always the lower-cost choice over the life of the drive.

The range in this SKU runs from A10 to A250, with 241 standard sizes. If you need a length outside the listed range, custom datum lengths are available — see the FAQ.

A v-belt Product Parameters and Representation Method

A Section Size Chart & PDF Download

The table below groups the A Section range into practical bands. All 241 standard sizes are available through the product options on this page. For the complete dimensional chart — full length-by-length listing (A10–A250), datum / inside / outside length conversion, pulley groove dimensions per ISO 4184 and the service factor chart — download the PDF.

Datum Length Code	Datum Length	Typical Application
A10 – A30	10″ – 30″	Small machine tools, domestic and light commercial equipment, tight-centre drives
A31 – A60	31″ – 60″	Compressors, pumps, blowers, conveyors, grain and food machinery
A61 – A100	61″ – 100″	HVAC air handlers, agricultural implements, printing press auxiliaries, general industrial drives
A101 – A160	101″ – 160″	Large air handlers, industrial fans, planters, tillers, oil presses, conveyors
A161 – A250	161″ – 250″	Long-centre drives, combine harvesters, large agricultural and industrial equipment

All A V-belts are manufactured to the ISO 4184 standard for classical V-belt drives (A profile), ensuring full dimensional interchangeability with equivalent-profile A V-belts from other mainstream international manufacturers.

The A V-belt range covers 241 sizes from A-10 to A-250. Sizes listed with prices on this page are in stock for quick ordering; the complete size list is available in the downloadable specification PDF.
📄 Download A V-Belt Complete Size Chart & Dimensional PDF

Installation & Maintenance

Correct Installation Procedure

Loosen the driven-machine foot bolts and close the centre distance before fitting the belt. Never pry a belt over a pulley rim — the forced bend breaks tension cords at one point and it fails later.
Seat the belt in the A-groove, then increase the centre distance gradually to apply tension.
Tension to the specified value with a proper tension gauge. Too tight overloads bearings; too loose causes slip, heat and rapid wear.
Run the drive 20–30 minutes under light load so the belt beds into the grooves, then re-check and adjust tension once.
Check pulley alignment with a straightedge. On a pulley of any size, 1 mm misalignment becomes visible wear in a week.

Maintenance Guidelines

Inspect belts every 500 operating hours for glazing, cracking or exposed cords.
Keep pulleys clean — packed dust acts like grinding paste on the sidewalls.
Replace all belts in a matched set together — never replace one belt alone.
Store spares off the floor, away from direct sunlight, welders and motor ozone.

Troubleshooting Guide

The belt cannot be tensioned

Possible causes: centre-distance adjustment range too small; belt stretched beyond recovery; drive frame undersized or overloaded; wrong belt length.
Remedies: re-design with a larger adjustment range; re-calculate the drive and resize; select the correct A-section datum length.

The belt wears out too quickly

Possible causes: belt past service life and compound aged; drive imposes excessive tension; poor installation causes misalignment or vibration.
Remedies: replace on a fixed schedule; correct the drive design; align and seat the belt properly at installation.

The belt breaks after a short time

Possible causes: pried onto the pulley and cords damaged; foreign object entered the drive; driven system seized; severe shock load.
Remedies: fit with centre distance closed, no forced leverage; fit a guard; clear the fault before restarting; re-design for the actual shock load.

The belt slips

Possible causes: insufficient tension, worn or contaminated groove, wrong drive ratio.
Remedies: tension to spec with a gauge; replace worn grooves; correct the drive ratio.

Frequently Asked Questions

What is the minimum order quantity for A V-Belts?

Our standard MOQ is 100 pieces per size. Because A section is often bought in matched sets, we support mixed-length orders and volume pricing for replacement programmes across a full production line. Contact our sales team for a flexible MOQ.

What is the delivery lead time?

Standard delivery is 15–20 days from order confirmation, depending on order volume and current production scheduling. Breakdown replacements can be prioritised on request.

Do you support custom belt lengths?

Yes. We supply custom datum lengths outside the A10–A250 range, and we also manufacture banded (joined) V-belts for long-centre drives where individual belts can turnover or whip. Provide the required dimension and application; custom items may carry a longer lead time and a minimum quantity.

How do I read the A V-Belt code?

The number after A is the datum length in inches. A100 has a 100-inch datum length. It is not the inside length and not the outside circumference — see the conversion chart in the downloadable PDF.

What material is the A V-Belt made from?

Natural rubber body, polyester tension cord and a wrapped fabric outer jacket. High strength, low elongation, wear-resistant, long fatigue life, minimal maintenance, consistent dimensions.

Is the A V-Belt oil and heat resistant?

No — and this matters. A section uses natural rubber, which is not oil-resistant. It operates from -30°C to +70°C. If your drive sees oil splash, chemical contact or sustained high ambient heat, our neoprene range (3V/5V/8V/SPZ/SPB/SPC, -40°C to +90°C) is the correct choice. Ask our team for a cross-reference.

Is the A V-Belt manufactured to ISO 4184?

Yes. All our A section wrapped V-belts are manufactured to ISO 4184, covering dimensional tolerances, length consistency and matched-set performance.

Can I replace just one belt in a multi-belt drive?

We recommend replacing the full matched set. A single new belt runs tighter than the worn belts beside it, takes most of the load and fails early. Replacing all belts is cheaper over the drive’s life.

Which machines use A section belts?

Printing presses, oil presses, grain handling, planters, rotary tillers, mowers, rice mills, HVAC air handlers, compressors, pumps, conveyors, woodworking machines, packaging equipment and every A-groove sheave drive in between.

Do you provide technical support for drive design?

Yes. Send centre distance, both pulley diameters and the service factor. Our engineering team returns a recommended belt code, normally within one working day.

How do I identify my current A belt?

The code is printed or embossed on the belt back, e.g. A100 for a 100-inch datum length. If the marking has worn away, measure top width (about 1/2″ / 12.7 mm) and datum length and send both figures to us — we will identify the replacement.

Ready to Specify Your A V-Belts?

Send the belt code, quantity and required delivery date. We confirm stock, issue a formal quote and ship within 15–20 days.

Request a Quote

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