Description
SPC Belt Size Chart 1800-14000mm 22x18mm ISO 4184 for Industrial Use
The largest SP-section wrapped metric V-belt, built with a chloroprene rubber body for genuine resistance to oil, heat, ozone and static. 22 mm top width, 18 mm section height, 40° wedge angle. Engineered for crushers, mills, conveyors, steel-plant auxiliaries and long-span drives up to 14 metres.
What Is an SPC Belt
The largest SP wedge-belt section — built for the heaviest drives where a classical section would need double the width.
The SPC belt is a wrapped metric V-belt with a 22 mm top width, 18 mm section height and a 40° wedge angle. It is the largest section in the SP series, and that size is the whole point: the narrow 40° wedge sinks deeper into the sheave groove and develops more grip per millimetre of belt width than a classical D-section belt. A drive that would need two D belts can often be done with one SPC — smaller sheave, lighter shaft load, less bearing wear.
Because the SPC is the largest SP section, it is the one called for when the frame is already tight and the power to be transmitted is high. That combination — high load in a compact footprint — is where the 40° wedge earns its keep, and it is why the section shows up across steel mills, mines, aggregate plants and long-span conveyor systems.
Our SPC belts are moulded rather than cut, so every belt of the same specification leaves production with an identical pitch 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 production. For a plant manager, that consistency is what keeps the maintenance budget where it belongs.
Every belt is manufactured to ISO 4184, the international standard covering dimensional tolerances and performance requirements for V-belts. When you specify our SPC belt, you are ordering a part that seats correctly in any ISO 4184-compliant SP sheave and runs to a known length tolerance.
Complete Technical Specifications
Verified under ISO 4184 test conditions. Supplied in matched pitch 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.
🔧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.
Polyester cord · chemically bonded
🏙Body Compound
The compression section is formulated from chloroprene rubber, giving the belt genuine cold and heat resistance, oil and chemical resistance, and anti-static performance for harsh plant environments.
Chloroprene rubber (CR) · oil & ozone resistant
📦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 SPC Wrapped V-Belt
Every claim below is measurable on the drive, not just on a spec sheet.
1 Heavy-Duty by Design
The largest SP section, made for the drives where a smaller belt would never be sized in. One SPC where two D belts would otherwise be needed.
2 Stretch-Resistant & Stable
Polyester cords hold their pitch length under maximum tension. Belts do not run slack after break-in, so re-tensioning stays rare and unplanned stops stay off the calendar.
3 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.
4 Slip-Resistant Grip
The wrapped cover and deep 40° wedge keep friction high in the groove. When a load spikes suddenly, the belt stays seated and torque keeps moving to the driven machine.
5 Heavy-Load Tolerant
Built for the starting torque and shock loads of crushers, mills, conveyors and steel-plant drives without cord damage or sidewall cracking.
6 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.
7 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.
8 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.
9 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.
10 Weather-Proof & Chemical Resistant
The chloroprene body and wrapped jacket shrug off oil mist, dust, ozone and UV — suitable for exposed quarry and jobsite conditions as well as the plant floor.
Industries & Equipment Served
The SPC section is specified wherever the drive is large, the frame is tight, and downtime is expensive.
Construction & Building Materials
Concrete mixers and milling-planing machines. Heavy shock loads, jobsite debris and long run hours — the conditions that expose a weak belt fast.
Mining & Aggregates
Sand makers, crushers, grinders, screening machines, conveyors, brick machines and rock drills. A wrapped belt with stable cords 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.
Petrochemical & Plastics
Dryers, industrial refrigeration, dehumidifiers, mixers, pulverizers, vacuum formers, blow moulders, extruders, forming machines and pelletisers.
Agricultural Machinery
Seed drills, rotary tillers, mowers, rice mills, micro-tillers, fertiliser spreaders, paddy de-huskers, grain grading screens, cleaning screens, ditch openers and pruning machines.
Textiles
Auxiliary equipment across spinning, weaving and finishing lines, where quiet, stable running protects product quality.
Auxiliary Equipment Across All Sectors
Fans, electric motors, gear reducers, mixers, air compressors, pumps and pulverizers. If a machine needs to turn reliably for years, the SPC belt is on the bill of materials.
How to Select Length & Matched Sets
An SPC belt code reads as SPC followed by the pitch length in millimetres. The number is the pitch length; the outside circumference is longer by the standard profile offset and 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 pitch 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 length, 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: 20 pcs per size | Delivery: 15-20 days
SPC Size Chart & PDF Download
The table below groups the full SPC range into practical pitch-length bands. Every size is available through the product options on this page. For the complete dimensional chart — pitch length, outside circumference conversion, sheave groove dimensions per ISO 4184 and the full length-by-length listing.
| Pitch Length Range | Nominal Code Example | Typical Application |
|---|---|---|
| 1350 – 2000 mm | SPC1350 to SPC2000 | Compact crushers, mixers, planers |
| 2000 – 3000 mm | SPC2000 to SPC3000 | Conveyors, steel-plant auxiliaries |
| 3000 – 5000 mm | SPC3000 to SPC5000 | Crushers, mills, paper and ceramic plant drives |
| 5000 – 8000 mm | SPC5000 to SPC8000 | Large mills, long conveyors, aggregate plants |
| 8000 – 12500 mm | SPC8000 to SPC12500 | Maximum-span drives |
| 12500 – 14000 mm | SPC12500 to SPC14000 | Extreme long-span applications |
The SPC belt range covers 379 sizes from SPC-1350 to SPC-14000. 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 SPC Complete Size Chart & Dimensional PDF
All SPC wrapped metric V-belts are manufactured to the ISO 4184 standard for narrow V-belt drives (SPC / 22N profile), ensuring full dimensional interchangeability with equivalent-profile SPC V-belts from other mainstream international manufacturers.
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 SPC 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 SPC belts?
Our standard MOQ is 20 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 pitch 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 SPC drives. Provide the required dimension, section and application. Custom items may carry a longer lead time and a minimum quantity.
What material is the SPC belt made from?
The SPC 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 SPC belts ISO certified?
Yes. All our SPC wrapped V-belts are manufactured to ISO 4184, covering dimensional tolerances, length consistency and performance requirements.
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 SPC 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.
How do I identify my current SPC belt?
The code is printed or embossed on the belt back, for example SPC5000 for a 5000 mm pitch length. If the marking has worn away, measure the pitch length and top width and send both figures to us — we will identify the correct replacement.
Ready to Specify Your SPC Belts?
Send the belt code, quantity and required delivery date. We will confirm stock, issue a formal quote and ship within 15–20 days.
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