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SPB Belt Size Chart 1120-10000mm 16×13.5mm ISO 4184 for Industrial Drives

The workhorse SPB belt wrapped metric V-belt, built with a chloroprene rubber body for genuine resistance to oil, heat, ozone and static. 16 mm top width, 13.5 mm section height, 40° wedge angle. Engineered for printing presses, oil presses, crushers, conveyors, steel-plant auxiliaries and long-span drives up to 10 metres.

16 mm Top width

13.5 mm Section height

40° Wedge angle

95%+ Efficiency

40 m/s Max belt speed

-40 to +90°C Temperature range
ISO 4184 Compliant
Millions Fatigue cycles

MOQ 50 pcs per size
Delivery 15-20 days

Wrapped SPB metric narrow V-belt with a 16 mm top width and a 13.5 mm section height for crushers, mills and conveyors

What Is an SPB Belt

The most widely used SP wedge-belt section — the practical middle ground between compact drives and heavy-tonnage plant.

The SPB belt is a wrapped metric V-belt with a 16 mm top width, 13.5 mm section height and a 40° wedge angle. It sits in the middle of the SP series: smaller than an SPC, larger than an SPA, and that is exactly why it is the section most often specified. Where an SPC would be oversized and a 5V or B-section would need more width, the SPB lands on the right belt for the job.

The 40° wedge is the technical story. A narrower wedge sinks deeper into the sheave groove and develops more grip per millimetre of belt width than a classical V-belt. The result is a smaller sheave, a lighter shaft load and less bearing wear for the same transmitted power — a real saving that shows up on the capital cost of the drive, not just the running cost.

Our SPB 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.

Every belt is manufactured to ISO 4184, the international standard covering dimensional tolerances and performance requirements for V-belts. Order with confidence: every belt seats correctly in any ISO 4184-compliant SP sheave.

Complete Technical Specifications

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

Profile

SPB

Top Width

16 mm

Section Height

13.5 mm

Wedge Angle

40°

Standard

ISO 4184

Body Compound

Tension Cord

Polyester / PA

Efficiency

95%+

Max Speed

40 m/s

Temperature

-40 to +90°C

Fatigue Life

Millions

Outer Cover

Wrapped

Materials & Construction

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

1Polyester / Polyamide Tension Cord

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

2Chloroprene Rubber Body

The compression section is formulated from chloroprene rubber, giving the belt cold and heat resistance, oil and chemical resistance, and anti-static performance — the properties that keep a belt working in harsh plant environments.

3Wrapped Fabric Jacket

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 SPB Belt

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

✔ISO-Compliant, Every Batch

Manufactured to ISO 4184 with moulded-to-length consistency, so a replacement ordered six months later drops into the same drive without re-engineering the frame.

✔Stretch-Resistant & Stable

Polyester/polyamide 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.

✔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.

✔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.

✔Heavy-Load Tolerant

Built for the starting torque and shock loads of crushers, conveyors, mixers and press drives without cord damage or sidewall cracking.

✔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.

✔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.

✔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.

✔Weather-Proof & Chemical Resistant

The chloroprene body and wrapped jacket shrug off oil mist, dust, ozone and UV. Suitable for plant floors and exposed quarry, farm and jobsite conditions alike.

✔Anti-Static for Hazardous Areas

The CR compound formulation includes anti-static properties, making the SPB suitable for environments where static discharge is a safety concern.

Industries & Equipment Served

The SPB belt is the most broadly applicable of the SP family — specified across ten industries and their auxiliary drives.

Printing

Offset printing presses and their auxiliary equipment, where smooth, stable running and compact drive layout protect print quality and machine life.

Grain & Oil Processing

Oil presses and all auxiliary equipment, including conveying, elevating and processing drives running long hours in dusty conditions.

Construction & Building Materials

Concrete mixers and milling-planing machines. Heavy shock loads, jobsite debris and long run hours are 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.

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.

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.

Textiles

Auxiliary equipment across spinning, weaving and finishing lines, where quiet, stable running protects product quality.

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

Oil pumping and extraction units, dryers, industrial refrigeration, dehumidifiers, mixers, pulverizers, vacuum formers, blow moulders, extruders, forming machines and pelletisers.

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 SPB belt is on the bill of materials.

Wrapped SPB narrow V-belt driving combine harvesters, micro tillers and grain machinery in heavy-duty agricultural drives

How to Select Length & Matched Sets

An SPB belt code reads as SPB 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.

For any drive using more than one belt, install a matched set. Because our belts are moulded to a consistent datum 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: 50 pcs per size | Delivery: 15-20 days

SPB Belt Product Parameters and Representation Method

SPB Size Chart & PDF Download

The table below groups the full SPB range into practical datum length bands. Every size is available through the product options on this page. For the complete dimensional chart — datum length, outside circumference conversion, sheave groove dimensions per ISO 4184 and the full length-by-length listing — download the PDF.

Datum Length Range	Nominal Code Example	Typical Application
800 – 1000 mm	SPB800 to SPB1000	Compact mixers, presses, planers, small conveyors
1000 – 1500 mm	SPB1000 to SPB1500	Presses, fans, pumps, oil-press auxiliaries
1500 – 2500 mm	SPB1500 to SPB2500	Crushers, conveyors, steel-plant auxiliaries
2500 – 4000 mm	SPB2500 to SPB4000	Mills, paper and ceramic plant drives
4000 – 6300 mm	SPB4000 to SPB6300	Long conveyors, aggregate and mining plants
6300 – 8000 mm	SPB6300 to SPB8000	Maximum-span drives
8000 – 10000 mm	SPB8000 to SPB10000	Extreme long-span applications

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

The SPB belt range covers 595 sizes from SPB-800 to SPB-10000. 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 SPB Complete Size Chart & Dimensional 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 SPB 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 SPB belts?

Our standard MOQ is 50 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 range, and we also manufacture banded (joined) V-belts for drives where individual belts can turnover or whip. Provide the required dimension, section and application. Custom items may carry a longer lead time and a minimum quantity.

What material is the SPB belt made from?

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

Are your SPB belts ISO certified?

Yes. All our SPB 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 SPB 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 SPB belt?

The code is printed or embossed on the belt back, for example SPB2500 for a 2500 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 SPB 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

Related Products: SPC Belt | 5V Belt | All V-Belts

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