Description
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.
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.
Materials & Construction
Three layers, each doing one job properly. Built on chloroprene rubber for genuine resistance to oil, heat, ozone and static.
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.
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.
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.
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.
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.
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.
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.
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.
High transverse stiffness prevents the belt from turning over in the pulley groove under load. Sidewalls resist abrasion and cracking even in abrasive conditions.
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.
Moulded to length under ISO 4184, so a replacement ordered six months later drops into the same drive without re-engineering the frame.
Set the tension correctly at installation and the belt runs for the duration of its service life with only routine visual inspection.
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
(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.
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.
Related Products: 5V Belt | SPC Belt | All V-Belts
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