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SPA Belt 732-5000mm 12.7x10mm ISO 4184 for Industrial Drives

The mid-range SP-section wrapped metric V-belt, built on chloroprene rubber for genuine oil, heat, ozone and static resistance. 12.7 mm top width, 10 mm height, 40° wedge angle — the balanced section for printing presses, oil presses, agricultural machinery, textile machines and petrochemical lines.

✂ ISO 4184 Compliant
⚡ 95%+ Efficiency
💪 40° Wedge
🔄 40 m/s Max
🌄 -40 to +90°C
📦 MOQ 100 pcs

🚚 Delivery 15-20 days

What Is an SPA Belt

The balanced SP wedge-belt section — enough cross-section to carry real load, compact enough to fit a small sheave.

The SPA Belt is a wrapped metric V-belt with a 12.7 mm top width, a 10 mm section height and a 40° wedge angle. It sits in the middle of the SP series — larger than SPZ, smaller than SPB — and that position is deliberate. A millimetre either way changes the whole drive: 12.7 mm top width gives the belt enough cross-section to transmit real power without forcing the designer into a sheave so large it will not fit the machine frame. The 40° wedge sinks deep into the groove and develops grip per millimetre of width that a classical A-section belt cannot match, so the same load moves through a smaller drive.

Our SPA belts are moulded rather than cut, so every belt of the same specification leaves production with an identical datum 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. Because different production batches are moulded to the same length tolerance, a replacement ordered months later drops straight into the same drive without re-engineering the frame.

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

Complete Technical Specifications

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

Profile

SPA

Top Width

12.7 mm

Section Height

10 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

Range

SPA550-SPA5282

Standard Sizes

350

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, 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.

Top 10 Advantages Explained

Every claim below is measurable on the drive, not just on a spec sheet. Ten reasons buyers specify SPA over a classical belt.

1 Premium-Grade Construction

Polyester cords, chloroprene body and a wrapped fabric jacket — three materials working as one belt rather than three layers that drift apart under load.

2 Stretch-Resistant & Stable

Polyester cords hold their datum 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 High-Performance Load Capacity

The 12.7 mm top width and 40° wedge transmit significantly more power per millimetre of belt width than a classical A-section belt, letting you downsize the drive without losing output.

4 Anti-Aging Compound

The CR formulation resists ozone and UV, so belts stored or running outdoors do not crack along the flanks. A five-year shelf life without hardening is routine, not a special request.

5 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.

6 Slip-Resistant Grip

The wrapped cover and 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.

7 Vibration-Dampening Operation

Smooth, quiet running with minimal vibration — important on printing presses and textile machines where belt chatter translates directly into poor product quality.

8 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.

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 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.

Industries & Equipment Served

The SPA is the balanced section called for when SPZ lacks the cross-section for the load but SPB would oversize the frame.

Printing Industry

Offset printing presses and full auxiliary equipment. SPA is listed among the recommended sections for this sector. Low vibration and a compact drive protect registration on the sheet, and the wrapped jacket keeps grip consistent through long runs.

Grain & Oil Processing

Oil presses and full auxiliary equipment. SPA is listed among the recommended sections for this sector. Steady torque and continuous operation make belt life a direct maintenance cost — the anti-aging compound pays for itself over a season.

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. Dust, mud, sun and sudden shock loads are normal here; SPA handles all four without complaint.

Textile Industry

Auxiliary equipment across spinning, weaving, knitting and finishing lines. Smooth, stable running protects fabric quality on every shift, and the chloroprene compound stands up to the oil mist these lines generate.

Petrochemical & Plastics Industry

Dryers, industrial refrigeration units, industrial dehumidifiers, mixers, pulverizers, vacuum formers, blow moulders, extruders, forming machines, pelletisers and extensive auxiliary equipment. Oil, heat and chemical exposure are exactly the conditions chloroprene rubber is built for.

Auxiliary Equipment Across All Sectors

Fans, electric motors, gear reducers, mixers, air compressors, pumps and pulverizers. If a machine needs to turn reliably in a compact frame, the SPA belt is on the bill of materials.

Wrapped SPA transmission belt / triangle V-belt driving printing presses, agricultural machinery and textile machines in industrial drives

Reading the SPA Code & Matched Sets

An SPA belt code reads as SPA followed by the datum length in millimetres. The number is the datum length; the outside circumference is longer by the standard profile offset and is listed in the downloadable chart below.

The SP range uses metric datum length marking, which keeps procurement simple: specify the length you need in millimetres, order the matching code, and the belt arrives at that length. 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 full range runs from SPA550 to SPA5282 in 350 standard datum lengths, including long-span sizes SPA3082, SPA3282, SPA3682, SPA3882, SPA4182, SPA4382, SPA4682, SPA4882 and SPA5282. If you need a length outside the standard list, custom lengths are available — see the FAQ below.

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

SPA Belt Product Parameters and Representation Method

SPA Size Chart & PDF Download

The table below groups the full SPA range into practical datum length bands. Every one of the 350 standard sizes is available through the product options on this page. For the complete dimensional chart — full length-by-length listing (SPA550–SPA5282), outside circumference conversion, sheave groove dimensions per ISO 4184 and the service factor chart.

Datum Length Range	Nominal Code Example	Approx. Outside (mm)	Typical Application
550 – 900 mm	SPA550 to SPA900	571 – 921 mm	Compact drives, small conveyors, auxiliary equipment
900 – 1300 mm	SPA900 to SPA1300	921 – 1321 mm	Fans, textile machines, mixers
1300 – 1800 mm	SPA1300 to SPA1800	1321 – 1821 mm	Printing presses, oil presses, conveyors
1800 – 2500 mm	SPA1800 to SPA2500	1821 – 2521 mm	Larger conveyors, industrial fans
2500 – 3500 mm	SPA2500 to SPA3500	2521 – 3521 mm	Long-span conveyors, screening machines
3500 – 5282 mm	SPA3500 to SPA5282	3521 – 5303 mm	Maximum-span drives (3882/4182/4382/4682/4882/5282)

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

The SPA belt range covers 300 sizes from SPA-550 to SPA-5282. 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 SPA belt specification and complete 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 SPA 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 SPA belts?

Our standard MOQ is 100 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 datum lengths outside the standard SPA550–SPA5282 range, and we also manufacture banded V-belts for drives where individual belts can turnover or whip — particularly useful on long-span SPA drives. Provide the required dimension, section and application. Custom items may carry a longer lead time and a minimum quantity.

How do I read the SPA belt code?

The number after SPA is the datum length in millimetres. So SPA1000 has a datum length of 1000 mm. The outside circumference is longer by the standard profile offset — see the conversion chart in the downloadable PDF.

What material is the SPA belt made from?

The SPA 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.

Is the SPA belt anti-aging?

Yes. The chloroprene compound resists ozone and UV, giving the belt a five-year shelf life without hardening and reliable outdoor service without flank cracking.

Is the SPA belt ISO certified?

Yes. All our SPA 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.

Which industries use the SPA belt?

SPA is specified across printing, grain & oil processing, agriculture, textiles and petrochemicals — the balanced section called for when SPZ lacks the cross-section for the load but SPB would oversize the frame. See the full equipment list above.

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 SPA belt?

The code is printed or embossed on the belt back, for example SPA1000 for a 1000 mm datum length. If the marking has worn away, measure the datum length and top width and send both figures to us — we will identify the correct replacement.

Ready to Specify Your SPA 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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anti-aging V-belt

SPA Belt 732-5000mm ISO 4184 Industrial Metric V-Belt