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8V Belt Size Chart 100″-560″ 25.4×23 mm ISO 4184 Heavy Duty

The largest of the narrow V-belt sections, engineered to transmit 50–100% more power than a conventional V-belt of the same top width. 1 inch top width, 0.91 inch section height, chloroprene rubber body for genuine oil, heat, ozone and static resistance. The compact-drive answer for crushers, mills, conveyors and long-span systems.

✂ Compliant with ISO 4184 or RMA IP-22

⚡ 95%+ Efficiency
💪 50-100% More Power
🔄 40 m/s Max
🌎 -40 to +90°C
📦 MOQ 10 pcs
🚚 Delivery 15-20 Days

■ What Is an (25N)8V Belt

A narrow-profile V-belt built to deliver exceptional power in a compact footprint — the largest of the 3V/5V/8V family.

The 8V belt is a wrapped narrow V-belt with a 1 inch (25.4 mm) top width and a 23 mm section height. Its job is simple: transmit more power than a conventional V-belt without taking up any more space. Where a machine designer is squeezed for frame width but still needs serious torque at the driven shaft, the 8V is the section that gets specified.

That capacity comes from the narrow profile itself. A deeper, narrower belt seats into the groove with more sidewall contact per millimetre of belt width, so it develops more grip at the same tension. The published figure is that an 8V transmits 50–100% more power than an ordinary V-belt of the same top width. For a plant engineer, that difference is not an academic number — it is the reason a retrofit can keep the same frame, sheaves and bearing arrangement while moving to a more powerful drive.

Our 8V belts are moulded rather than cut, so every belt of the same specification leaves production with an identical length. In a matched multi-belt drive that means every belt carries the same share of load from the first hour. No one belt runs tight and takes the punishment, no flank wears out early, and no unexpected break stops a production line. The belt also has high transverse stiffness, which keeps it from turning over in the groove under heavy load — a particular issue on long-span drives.

Every belt is manufactured to ISO 4184, the international standard covering dimensional tolerances and performance requirements for V-belts. When you specify our 8V belt, you are ordering a part that seats correctly in any ISO 4184-compliant 8V groove and runs to a known length tolerance.

■ Complete Technical Specifications

Verified under ISO 4184 test conditions. Supplied in matched lengths for multi-belt drives.

Profile

(25N)8V

Top Width

1 in (25.4 mm)

Section Height

23 mm

Wedge Angle

40°

Body Compound

Tension Cord

Polyester

Outer Cover

Wrapped

Standard

ISO 4184

Efficiency

95%+

Max Speed

40 m/s

Temperature

-40 to +90°C

Fatigue Life

Millions

Power vs Classical

+50-100%

■ Materials & Construction

Three layers, each doing one job properly. Built on chloroprene rubber for genuine resistance to oil, heat, ozone and static.

🔧Tension Member

Imported high-tenacity polyester cords give exceptional tensile strength with very low elongation under load, and are chemically bonded into the rubber body so they will not separate after millions of flex cycles.

🏙Body Compound

The compression section is formulated from chloroprene rubber (CR), giving the belt genuine cold and heat resistance, oil and chemical resistance, and anti-static performance for harsh plant environments.

📦Outer Cover

A treated fabric is wrapped around the full belt to protect the sidewalls from abrasion and oil mist, while raising the friction the belt needs in the sheave groove.

■ Why Choose Our 8V Wrapped V-Belt

Every claim below is measurable on the drive, not just on a spec sheet.

1.Heavy-Duty Power Capacity

Transmits 50–100% more power than a conventional V-belt of the same top width. Compact frame, full torque — the reason an 8V is specified for crushers and mills.

2.High-Performance Narrow Profile

At 1 inch top width and 23 mm height, the 8V lets you design a smaller drive system, saving frame space and reducing the overall weight of the machine.

3.Stretch-Resistant & Stable

Polyester cords hold their length under maximum tension. Belts do not run slack after break-in, so re-tensioning stays rare and unplanned stops stay off the calendar.

4.Wear-Proof in Daily Service

In continuous running under rated load, measured belt wear stays below 2% even after 1,000 hours on the drive. Fewer changeouts, no production line halted for a belt swap.

5.Slip-Resistant Grip

The wrapped cover and narrow profile keep friction high in the groove. When a load spikes suddenly, the belt stays seated and torque keeps moving to the driven machine.

6.Heavy-Load Tolerant & Stable

High transverse stiffness prevents the belt from turning over in the pulley groove under load. Sidewalls resist abrasion and cracking even in abrasive conditions.

7.Energy Efficient

At 95%+ transmission efficiency, more motor output reaches the driven shaft. Over a belt’s service life that difference shows up on the energy bill.

8.Consistent, Batch After Batch

Moulded to length under ISO 4184, so a replacement ordered six months later drops into the same drive without re-engineering the frame.

9.Low-Maintenance Operation

Set the tension correctly at installation and the belt runs for the duration of its service life with only routine visual inspection.

10.Long-Lifespan Construction

Fatigue resistance rated in the millions of cycles, with crack resistance and ozone resistance built into the compound for reliable indoor and outdoor service.

■ Industries & Equipment Served

The 8V is specified wherever the drive is large, the frame is tight, and downtime is expensive.

Mining & Aggregates

Sand makers, crushers, grinders, screening machines, conveyors, brick machines and rock drills. A wrapped belt with stable cords and high transverse stiffness earns its keep in abrasive environments.

Steel & Metallurgy

Forging presses, grinders, planers, drilling machines, sawing machines, plate shears, forming machines, conveyors, crushers, mixers, distributors, belt conveyors, separators, feeders, continuous casters, cutting equipment, bundling machines, marking machines and full auxiliary systems.

Paper & Pulp

Pulpers, washers, bleach washers, breakers, separators, refiners, flotation cells, beaters, disc refiners, washing machines, straw cutters, reed cutters and wood chippers. Continuous running makes belt life a direct maintenance cost.

Ceramics & Building Materials

Ball mills, grinding mills and shaker screens. High-inertia loads with long run hours, where a belt that holds its tension pays back every month.

Construction & Building Materials

Milling-planing machines. Heavy shock loads and long run hours are the conditions that expose a weak belt fast.

Auxiliary Equipment Across All Sectors

Heavy-duty pumps, large air compressors, industrial fans, gear reducers, mixers and pulverizers. If a machine needs to turn reliably for years, the 8V belt is on the bill of materials.

■ Reading the 8V Code & Matched Sets

An 8V belt code reads as 8V followed by a number that is the outside circumference in inches. So 8V1000 has an outside circumference of 100 inches — about 2540 mm. This is the standard 3V/5V/8V convention of outside circumference divided by ten. The number is not the pitch length; the pitch length is shorter by the profile offset, and that conversion is listed in the downloadable chart below.

For any drive using more than one belt, install a matched set. Because our belts are moulded to a consistent length, every belt in the 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.

If you are unsure of the correct code, send us the centre distance, both sheave diameters and the service factor you want to apply. Our engineering team will return a recommended belt code, normally within one working day. MOQ: 100 pcs per size | Delivery: 15-20 days

8V Belt Product Parameters and Representation Method

■ (25N)8V Size Chart & PDF Download

The table below groups the full 8V range into practical length bands. Every size is available through the product options on this page. For the complete dimensional chart — outside circumference in inches, conversion to pitch length and millimetres, sheave groove dimensions per ISO 4184 and the full length-by-length listing.

Outside Circ. (in)	Belt Code	Approx. Outside (mm)	Typical Application
87 – 110 in	8V870 to 8V1100	2210 – 2794 mm	Compact crushers, planers, mixers
110 – 160 in	8V1100 to 8V1600	2794 – 4064 mm	Pumps, fans, steel-plant auxiliaries
160 – 254 in	8V1600 to 8V2540	4064 – 6452 mm	Crushers, mills, conveyors
254 – 360 in	8V2540 to 8V3600	6452 – 9144 mm	Large mills, long conveyors, aggregate plants
360 – 500 in	8V3600 to 8V5000	9144 – 12700 mm	Maximum-span drives
500 – 596 in	8V5000 to 8V5960	12700 – 15138 mm	Extreme long-span applications

All 8V wrapped V-belts are manufactured to the ISO 4184 standard for narrow V-belt drives (25N/8V profile), ensuring full dimensional interchangeability with equivalent-profile 8V V-belts from other mainstream international manufacturers.

8V (25N) wrapped V-belt driving a crusher, conveyor, pump and steel mill drive for heavy industrial power transmission

The 8V belt range covers 489 sizes from 8V-870 to 8V-5960. 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 the 8V (25N) belt specification and complete ISO 4184 size chart PDF

■ Installation & Maintenance

Correct Installation Procedure

Loosen the driven-unit mounting bolts and reduce the centre distance before fitting the belt. Never lever a belt over a sheave rim — the forced bend will break tension cords at one point along the belt.
Seat the belt in the grooves, then increase the centre distance gradually to apply tension.
Tension to the specified value with a proper tension gauge. Too tight overloads the bearings; too loose causes slip, heat and rapid wear.
Run the drive 15–30 minutes under light load so the belt beds into the grooves, then re-check and adjust tension once.
Check sheave alignment with a straightedge. Misalignment wears one belt sidewall quickly and shortens belt life.

Maintenance Guidelines

Inspect belts every 500 operating hours for glazing, cracking or exposed cords.
Keep sheaves clean and free of oil, grease and embedded debris.
Replace all belts in a matched set together — never replace one belt alone.
Store spares in a cool, dry place away from direct sunlight and ozone sources such as electric motors.

■ Troubleshooting Guide

The belt cannot be tensioned

Possible causes: the centre-distance adjustment range is too small; the belt has stretched beyond recovery or the drive frame is undersized and overloaded; the belt length is wrong.
Remedies: re-design the drive with a larger adjustment range; re-calculate the drive data and resize the drive; select the correct 8V length.

The belt wears out too quickly

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

The belt breaks after a short time

Possible causes: it was pried onto the sheave and cords were damaged; a foreign object entered the drive and snapped it; the driven system seized; severe shock loading or a load applied too suddenly.
Remedies: loosen the mounting bolts and reduce centre distance to fit the belt with no forced leverage; fit a guard to keep debris out; stop and clear the fault before restarting; re-design for the actual shock load and ramp loads up gradually.

Black powder is coming off the belt

Cause: on a new installation the sheave surface finish is too rough, so the belt rubs off fine black rubber dust.
Remedy: improve the sheave surface finish.

The belt slips

Possible causes: insufficient tension, worn or contaminated sheave grooves, or a drive ratio that no longer matches the requirement.
Remedies: adjust tension to the specified value with a tension gauge; inspect and replace worn or contaminated grooves; correct or replace the drive so the ratio matches.

■Frequently Asked Questions

What is the minimum order quantity for 8V belts?

Our standard MOQ is 10 pieces per size. For mixed-length orders, recurring supply contracts or bonded warehouse programmes, contact our sales team for volume pricing and 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. Rush orders can be accommodated on request.

Do you support custom belt lengths?

Yes. We supply custom lengths outside the standard range, and we also manufacture banded (joined) V-belts for drives where individual belts can turnover or whip, particularly useful on long-span 8V drives. Provide the required dimension, section and application. Custom items may carry a longer lead time.

How do I read the 8V belt code?

The number after 8V is the outside circumference in inches. So 8V1000 has an outside circumference of 100 inches, or about 2540 mm. It is not the pitch length – convert using the chart in the downloadable PDF.

What material is the 8V belt made from?

The 8V body is chloroprene rubber (CR), with a polyester tension cord and a wrapped fabric outer jacket. This gives the belt genuine resistance to oil, heat, ozone and static.

Are your 8V belts ISO certified?

Yes. All our 8V wrapped V-belts are manufactured to ISO 4184, covering dimensional tolerances, length consistency and performance requirements, and are fully dimensionally interchangeable with equivalent-profile 8V V-belts from other mainstream international manufacturers.

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.

What temperature can the standard 8V belt handle?

The standard chloroprene rubber construction runs reliably from -40°C to +90°C, with resistance to oil, chemical, ozone and static conditions built in.

Do you provide technical support for drive design?

Yes. Our engineering team provides free support for drive calculation, belt selection and tensioning. Send centre distance, sheave diameters and service factor and we respond within one working day.

Ready to Specify Your 8V Belts?

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

Request a Quote

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