V-belt XPB 1250 - 17x14MM - PIX X'tra ®

V-belt XPB 1250 - 17x14 MM - PIX X'tra ® - timing raw edge XPB V-belt with Ld 1250 mm

V-belt XPB 1250 - 17x14 MM - PIX X'tra ® is developed for V-shaped belt drives, where the sides of the belt work against the pulley grooves. The timing PIX X'tra® construction makes the belt flexible around the pulley, and the data given can be compared to a belt's technical specification: profile XPB, goal 17x14MM, Ld 1250mm, Li 1190mm and La 1278mm.

XPB is a stronger timing narrow V-belt, which is often used when more power needs to be transmitted than in the smaller XPZ and XPA profiles. The belt is particularly relevant for more powerful belt drives, where the motor, pu , fan, compressor or process machine requires a wider contact surface. The correct cross-section is essential for the sides of the belt to grip the pulley properly and can transmit the torque without unnecessary slip.

Product data

• Profile: XPB
• Goal: 17x14MM
• Effective length: Width 1250 mm
• Inner length: L 1190 mm
• External length: Width 1278 mm
• Series: PIX X'tra® Molded Raw Edge Cogged Belts
• Construction: raw edge and Cogged V-belts
• Profile angle according to PIX data sheet: 36° ± 1°
• Mark: PIX

Length specifications

The Ld dimension is the effective length and the length specification typically used for narrow V-belts. Li describes the inner length, while La describes the outer length. The three dimensions must be understood together with the profile, cross-section and pulley grooves, because the length designation alone does not describe the full geometry of the belt.

The three length specifications describe the belt's geometry from each measurement position. L 1190 mm describes the inner length, Width 1250 mm is the effective length, and Width 1278 mm is the outer length. The difference between them is due to the geometry of the belt and the measurement method. Therefore, belts with almost the same outer dimensions can still have different technical specifications.

With Ld 1250 mm, the belt is in a common working range for many machines. Here, it is typically not only the length, but also the condition of the pulleys, center distance and correct tension that determine whether the belt drive runs stably over time.

Construction and technical features of PIX X'tra®

The raw edge construction means that the sides of the belt are designed for direct contact with the pulley. The serrated underside makes the belt more compliant around pulleys, especially where the diameter is limited. PIX also specifies polyester cord as a tensile member, which is relevant for longitudinal stability and load capacity in a correctly dimensioned belt drive.

PIX states for the X'tra® series a power transmission capacity of 15–20% over wrapped belts in comparable operating conditions. The data sheet also highlights better flexibility, approximately 20% higher heat dissipation than wrapped belts, possibility of smaller pulleys in compact drives, maximum linear belt speed up to 42 m/s, antistatic design, oil and heat resistance, REACH/RoHS compliance and temperature range from -45°C to +120°C.

For the XPB profile, the PIX data sheet states the length range 550–8380 mm. This belt with Ld 1250 mm is in the range 550–3000 mm, where the data sheet states a length tolerance of ±6 mm and a set tolerance of 2 mm. The tolerances are relevant when replacing, especially if several belts are to run in parallel or if the center distance can only be adjusted to a limited extent.

Use for the XPB profile

This XPB belt is relevant in medium and heavier applications where an XPZ or XPA profile does not provide sufficient bearing surface for the current belt drive. In operation, the pulley groove, the belt cross-section and the timing construction are important for the contact between the belt and pulley. Profile and length must match, as the correct length does not compensate for an incorrect cross-section.

The operating situation has a great impact on the belt's lifespan: is the belt running constantly, are there many starts/stops, is the load even, and are the pulleys clean and in good condition? This XPB belt is designed for mechanical power transmission, but lifespan and operation still depend on alignment, tension, temperature, pulley quality, and whether the belt is installed without damage.

Profile and pulley compatibility

XPB belongs to the same narrow profile family as SPB, but the belt has its own technical specification with a timing, raw-edge construction. The belt works with side contact in the pulley groove, and the correct groove profile is necessary for the contact surface, friction and load to be distributed correctly. Incorrect cross-section or skewed pulleys can cause overheating, noise, slippage and uneven wear.

The technical identification consists of the combination XPB, 17x14MM, Width 1250 mm, L 1190 mm, Width 1278 mm and PIX X'tra®The combination distinguishes the item from nearby V-belts with other profiles, other length standards or a different construction.

Installation and operation

When installing, the belt should be placed without being twisted or forced over the pulley with a screwdriver or other sharp tool. Instead, adjust the center distance or loosen the relevant tensioning device so that the belt can be installed without damage. After installation, the belt should have the tension that the machine is designed for, because both too loose and too tight a belt can cause problems.

A new belt should be installed in clean, dry and undamaged pulleys. Oil, old belt dust, rust or sharp edges can shorten the life. Alignment between the pulleys is also important. Even a good belt can quickly wear out if the pulleys are misaligned or if the belt is forced to work sideways.

Avoid using belt spray as a permanent solution to slippage. Slippage is often caused by incorrect tension, worn pulleys, oil contamination or incorrect belt specification. A properly specified XPB belt of the correct length and in a clean, aligned belt drive is a more durable solution than temporary remedies.

In practice, the combination of XPB profile, 17x14 MM and Ld 1250 mm means that the belt works as part of the overall geometry of the belt drive. The rough-edged side surface transfers the force to the pulley, while the teeth on the inside support the flexibility around the pulleys. With correct tension, the belt can work smoothly with a lower risk of heat build-up, slippage and unnecessary wear. The specified Li, Ld and La dimensions also make it clear which measurement line is being described.

The raw edge construction gives the belt direct working surfaces against the pulley. Together with the polyester tension member and the serrated underside, this contributes to a design designed for mechanical power transmission under varying operating conditions.

Technical questions about XPB V-belts

What does XPB 1250 mean on this belt?

XPB is the profile designation and 1250 refers to the effective length Ld in millimeters. For this item, this means that the belt is specified as XPB profile with dimensions 17x14 MM, Li 1190 mm, Ld 1250 mm and La 1278 mm.

Is PIX X'tra® a regular wrapped V-belt?

No. The PIX X'tra® in this series is a moulded raw edge cogged belt. It differs from classic wrapped belts in construction, flexibility and working surface.

When should the belt be replaced?

The belt should be replaced if there are ctiming bars, obvious side surface wear, frayed edges, glazing, squealing, vibrations or repeated retensioning. The pulleys should also be in good condition, as a new belt will wear quickly in damaged grooves.

Do all belts need to be replaced if there are several next to each other?

Yes, in parallel belt drives it is usually best to replace the entire set. Mixing belts of different ages or levels of wear can cause the load to be unevenly distributed, causing one belt to work harder than the others.

Can the belt be used in hot or oily environments?

PIX lists the series as heat and oil resistant, but this does not mean that the belt should run in constant oil contamination or without control of the operating environment. Cleaning, shielding and correct sizing are still important.

What does antistatic performance mean?

Antistatic design means that the belt is designed to reduce static charge under suitable conditions. In specific environments, the final suitability depends on the requirements of the entire plant and relevant approvals.

Belt operation depends on the profile, length, tension and pulley groove matching. Worn or damaged grooves can shorten belt life, while correct alignment and a clean contact surface provide more stable power transmission.

Short conclusion: V-belt XPB 1250 - 17x14 MM - PIX X'tra ® is an XPB V-belt from PIX X'tra® with dimensions 17x14 MM, Ld 1250 mm, Li 1190 mm and La 1278 mm. It is a relevant belt type when the belt drive requires this particular profile and a rough-edged, timing construction with the technical properties that PIX specifies for the X'tra® series.