ConCar narrow V-belt SPZ - 1137 Lw

ConCar narrow V-belt SPZ – 1,137 mm effective length – DIN 7753 / ISO 4184

This ConCar narrow V-belt with SPZ profile and an effective length of 1,137 mm is manufactured according to DIN 7753 Part 1 and ISO 4184. The fabric on the outside is not decorative, but a functional component: it protects the rubber core against abrasion at the groove edge, against oil and dust, and ensures a consistent coefficient of friction throughout its entire service life.

This length in the drive

With an effective length of 1,137 mm, this belt falls within the middle length range of the SPZ profile, the range with the most favorable ratio of bending to tensile stress. Two identical pulleys with a 180 mm diameter result in a center distance of approximately 285 mm. Most standard drives are designed within this range because the wrap, tensioning travel, and belt mass are well-matched.

For ordering and comparing with an existing belt, the three length dimensions are important because different manufacturers use different reference dimensions. The effective length (Lw, sometimes Ld) is 1,137 mm. This is the standard dimension for narrow V-belts and is therefore included in the product description. The inner length (Li) is 1,099 mm, and the outer length (La) is 1,150 mm. For the SPZ profile, the fixed distances according to DIN 7753 are Li = Lw − 38 mm and La = Lw + 13 mm.

Dimensions and specifications

• Effective length (Lw / Ld): 1,137 mm

• Internal length (Li): 1,099 mm

• External length (La): 1,150 mm

• Profile: SPZ according to DIN 7753 Part 1 / ISO 4184

• Top width: 9.7 mm (nominal size 10 mm)

• Height: 8 mm

• Flank angle: 40°

• Construction: sheathed, rubberized fabric casing

• Mixture: Chloroprene (CR)

• Tensioning material: Polyester cord

• Antistatic: yes, according to ISO 1813

• Temperature range: -30 °C to +80 °C

• Belt speed: up to 40 m/s

• Recommended minimum guide diameter: 63 mm

• Suitable pulleys: Narrow V-belt pulleys according to DIN 2211, profile SPZ

• Manufacturer: ConCar

Structure and materials

The belt consists of a chloroprene compound with a high-strength polyester tensile member and an abrasion-resistant fabric covering. The compound is oil and heat resistant and antistatically conductive to prevent electrostatic charge buildup during operation. It can be used in temperatures ranging from -30 to +80 degrees Celsius, and for short periods even higher.

The flank angle of 40 degrees is the same for all narrow V-belts and corresponds to the groove geometry according to DIN 2211. The difference to the classic V-belt according to DIN 2215 lies in the width-to-height ratio: The SPZ profile has a top width of 9.7 mm and a height of 8 mm. This positions the tensile member further from the groove base, resulting in a larger flank area relative to the belt height, and thus allowing the belt to transmit significantly more power within the same installation space.

Typical areas of application

The SPZ profile is the entry-level option for narrow V-belts and is used wherever space is limited: fans and blowers in air conditioning and ventilation systems, dust extraction systems, small compressors, drilling and grinding machines, lawnmowers and garden equipment, and pumps in building services engineering. For power outputs up to approximately 4 kW per belt, SPZ is usually the most compact solution without sacrificing the power density of a narrow V-belt profile.

Assembly and tension

For installation: Reduce the center distance, place the belt without tension, then tighten it to the required tension. Never pull the belt over the pulley edge or pry it open with a screwdriver. Doing so will cause individual cord threads in the tension member to break, which remains invisible from the outside and will cause the belt to fail after only a few hours of operation.

When changing the belt, check the pulley. A worn groove allows the belt to sink too deeply until it rests on the bottom of the groove and loses contact with the belt edges. This manifests as a sudden loss of power, even with a new belt. A groove feeler gauge will clarify this in a minute. Also check the alignment of the pulleys: Even a few millimeters of misalignment over a distance of one meter can halve the belt's lifespan.

Similar names for other brands

Narrow V-belts are standardized according to DIN 7753 Part 1 and ISO 4184. A belt with profile SPZ and an effective length of 1,137 mm is therefore dimensionally identical regardless of the manufacturer and will run in your existing pulleys without modification. This belt replaces, among others:

• OPTIBELT: SK SPZ / SUPER X-POWER SPZ

• GATES: Super HC SPZ / Delta Narrow Wedge SPZ

• CONTITECH: CONTI-V ADVANCE SPZ

• MEGADYNE: Oleostatic SPZ

• MITSUBOSHI: Wedge SPZ

• BANDO: Power Ace SPZ

• PIX: X'set SPZ

Delivery

The belt is supplied as a single, endless belt. Standard lengths are available from stock, and delivery is available throughout the EU. For multi-belt drives, please specify the required quantity, and we will assemble the order from a single batch.