V-belt XPZ 975 - 10x8 MM - PIX X'tra ®

V-belt XPZ 975 - 10x8 MM - PIX X'tra ® - raw edge and Cogged V-belts from PIX X'tra®

V-belt XPZ 975 - 10x8 MM - PIX X'tra ® is a raw edged and Cogged V-belts from the PIX X'tra® series. It is intended for belt drives where the profile, length and pulley groove must match exactly to ensure stable operation. This variant has profile XPZ, goal 10x8MM, effective length Ld 975 mm, inside length 938 mm and external length Width 988 mm.

XPZ is the lightest profile in the XP series and is typically used when the machine requires a narrow, Cogged V-belts with high flexibility. The belt is particularly relevant for compact belt drives, smaller pulleys and installations where space around the shafts is limited. The correct cross-section is essential for the sides of the belt to grip the pulley properly and be able to transfer the torque without unnecessary slip.

Product data

• Profile: XPZ
• Goal: 10x8MM
• Effective length: Ld 975 mm
• Inner length: 938 mm
• External length: Width 988 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. 938 mm describes the inner length, Ld 975 mm is the effective length, and Width 988 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 975 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 XPZ profile, the PIX data sheet states the length range 550–5000 mm. This belt with Ld 975 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 XPZ profile

In practice, this type of belt is often used for compact belt drives, smaller pulleys and installations where space around the shafts is limited. However, the belt should not be selected solely based on the machine type. Two machines can use different profiles, even if they look similar from the outside. The correct check is therefore the product name, belt marking, pulley profile and the three length measurements.

If the machine has previously used a regular wrapped V-belt, a timing raw edge type may be interesting for compact drives or when greater flexibility is needed. This does not mean that all belts can be freely replaced. The safe method is to maintain the same profile family, assess the length and ensure that the pulleys are suitable for the specified belt type.

Profile and pulley compatibility

XPZ belongs to the same narrow profile family as SPZ, 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 XPZ, 10x8MM, Ld 975 mm, 938 mm, Width 988 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 correctly specified XPZ belt of the correct length and in a clean, aligned belt drive is a more durable solution than temporary remedies.

The technical dimensions of this belt should be seen as a complete set: XPZ, 10x8 MM, Li 938 mm, Ld 975 mm and La 988 mm. Each dimension describes a specific part of the belt geometry, and the combination has an impact on tension, pulley engagement and the way the load is distributed. When the belt drive is clean, correctly aligned and without damaged grooves, the timing PIX X'tra® construction has better working conditions.

Technical questions about XPZ V-belts

What does XPZ 975 mean on this belt?

XPZ is the profile designation and 975 refers to the effective length Ld in millimeters. For this item, this means that the belt is specified as XPZ profile with dimensions 10x8 MM, Li 938 mm, Ld 975 mm and La 988 mm.

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.

Can this profile replace a related SP profile?

It may be relevant in the same profile family, but it should not be used blindly as a replacement. Assess the pulley groove, the length measurement, the machine documentation and whether a raw edge timing belt is suitable for the system.

Why does a new V-belt get hot?

Heat is often caused by incorrect tension, misaligned pulleys, worn grooves, excessive load or incorrect profile. A correctly specified belt can still have a short life if the belt drive is not adjusted correctly.

Is external length the same as effective length?

No. La is the external length, while Ld is the effective length. They must not be mixed up because the difference may be enough to prevent the belt from being tensioned correctly.

For operational reliability, it is also important to look at the entire belt drive. A V-belt only works optimally when the pulleys have the correct groove profile, when the shafts are parallel, and when the belt is neither overloaded nor runs with too little tension. This applies to both single belts and sets of multiple parallel belts.

When making technical comparisons, length, profile, cross-section and the product's Li, Ld and La should be viewed together. This makes the difference between internal, effective and external length clear and reduces the risk of confusion between adjacent belt sizes.

Short conclusion: V-belt XPZ 975 - 10x8 MM - PIX X'tra ® is an XPZ V-belt from PIX X'tra® with dimensions 10x8 MM, Ld 975 mm, Li 938 mm and La 988 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.