ConCar narrow V-belt SPC - 7500 Lw

ConCar narrow V-belt SPC – 7,500 mm effective length – DIN 7753 / ISO 4184

The ConCar SPC narrow V-belt with a 7,500 mm effective length is a sheathed, high-performance V-belt conforming to DIN 7753 Part 1 and ISO 4184. Narrow V-belts transmit power via their two flanks, which engage the groove of the pulley at a 40-degree angle. This wedge action creates a normal force that is many times greater than the applied preload, and this force generates the friction that transmits the torque.

This length in the drive

With an effective length of 7,500 mm, this belt is one of the longer versions of the SPC profile. With two equally sized pulleys with a 1,250 mm center diameter, this corresponds to a center distance of approximately 1,785 mm. Long belts are less prone to bending stress; at 25 m/s, they only rotate about 3.3 times per second. However, they require more attention to tension: with a large center distance, the slack side tends to flutter, which introduces vibrations into the drive and puts stress on the bearings.

For ordering and comparing with an existing belt, the three length dimensions are important because different manufacturers print different reference dimensions. The effective length (Lw, sometimes Ld) is 7,500 mm. This is the standard dimension for narrow V-belts and is therefore included in the product description. The inner length (Li) is 7,417 mm, and the outer length (La) is 7,530 mm. For the SPC profile, the fixed distances according to DIN 7753 are Li = Lw − 83 mm and La = Lw + 30 mm.

Dimensions and specifications

• Effective length (Lw / Ld): 7,500 mm

• Internal length (Li): 7,417 mm

• External length (La): 7,530 mm

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

• Top width: 22 mm

• Height: 18 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: 224 mm

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

• 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 SPC profile has a top width of 22 mm and a height of 18 mm. This positions the tensile member further from the groove base, the flank area is larger relative to the overall height, and the belt transmits noticeably more power within the same installation space.

Typical areas of application

The SPC profile is the largest standardized narrow wedge profile and is used in heavy-duty industrial drives: large fans, crushers and screening plants, mills, ship auxiliary drives, large compressors and pump units in the process industry. Depending on the design, up to approximately 80 kW per belt can be transmitted; operation is almost exclusively in multi-belt sets.

Assembly and tension

A narrow V-belt is fitted and tensioned using the adjustment range of the motor rocker or the tensioning rail, never by force. Insufficient tension leads to slippage, which burns the belt edges and can destroy the belt within hours; excessive tension puts unnecessary stress on shafts and bearings and shortens their lifespan. Both can be precisely adjusted using the belt tension.

If several belts are running in parallel, always replace the entire set. A new belt next to worn ones will have less stretch and will essentially carry the entire load while the old ones continue to run. This results in the new belt failing after a short time and leading to the suspicion that the quality was substandard. ConCar manufactures belts with precise length tolerances, so belts from the same batch can be used as a set without pre-sorting.

Similar names for other brands

Narrow V-belts are standardized according to DIN 7753 Part 1 and ISO 4184. A belt with an SPC profile and an effective length of 7,500 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 SPC / SUPER X-POWER SPC

• GATES: Super HC SPC / Delta Narrow Wedge SPC

• CONTITECH: CONTI-V ADVANCE SPC

• MEGADYNE: Oleostatic SPC

• MITSUBOSHI: Wedge SPC

• BANDO: Power Ace SPC

• PIX: X'set SPC

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.