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B57 B-Section Classical Belt, Li = 1450mm, Lp = 1491mm, 0.271 kg

  • Classical Belts B Section
  • B57 Pix B-Section Classical Belt, inside length = 1450 mm, Datum/Pitch length = 1491 mm, mass = 0.271 kg.
£11.52 (inc VAT) £9.60 (exc VAT)
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Product Description

B57 Pix B-Section Classical Belt : inside length = 1450 mm : Datum/Pitch length = 1491 mm : mass = 0.271 kg.

B57 Pix B-Section Classical Belt : inside length = 1450 mm : Datum/Pitch length = 1491 mm : mass = 0.271 kg.

B-Section Belts - 17mm wide : 11mm deep : 40° wedge angle

PIX Classical Belts

Standards & Dimensions:

PIX manufactures the entire range of Classical V-belts. The nominal length designation for classical v-belts is the inside length.

The first of the V-belts to enter the power transmission scenario. Power ratings are considerably higher than most of the available in the market. The compounds used to build up these belts are well chosen to match the stipulated power ratings thus offering distinct advantages regarding the increased factor of safety on critical drives.

The standards followed by PIX has put the tolerances to be much more stringent than BS 3790, which forms the basis of PlX classical belts.

Properties :

PIX classical belts have a belt width to height ratio of approx 1.6:1. The maximum permissible belt speed is 30 m/sec,which should not be exceeded. The permissible flex rate is around f=80 per second


- Oil Resistant
- Antistatic
- Temperature range: -18°C to +80°C
- Maximum belt linear speed : 30 m/sec
- ATEX certified FRAS belts are available

Useful Information:

Belt Length Factor
- Lp to La - 26
- Li to Lp - 43
- Li to La - 69

Weight per metre (Kgs)
- 0.182

Rec. Min Pulley Dia.
- 112 dp (mm)

Applications :

Primarily used as replacement on industrial drives. Special application is V flat drives where only classical belts are recommended in applications where reverse idlers have to be used, classical belts are more advantageous than other belts, because of smaller heights.


Defining V-Belt Lengths

Specifying the length of a belt can be confusing. Although it is normally recommend using effective length; outside, inside, pitch and nominal length are frequently used; and switching between these terms can be confusing!

1. Outside Belt Length (La): The outside length of a belt is usually measured with a tape under no tension. Its validity is questionable since some belts have an arched top whereas others are flat. The use of this measure therefore, would give different readings for two otherwise identical belts. It can be used only as an approximation.

2. Inside Belt Length (Li): The inside length is measured with flat pulleys or a tape measure. As with the outside length, the inside length varies with the manufacturer. This length, ideally, should not be used.

3. Belt Pitch Length (Lp): The pitch length of a belt is the length at the pitch diameter of the sheaves being used.

Classical industrial belts are specified in terms of pitch length. The pitch length is obtained by adding the pitch circumference of one sheave to twice the centre distance between two equal diameter sheaves at a specified tension. [More recently changed to datum length.]

The belt pitch length is normally the length at the belt pitch line. This line is generally located at the neutral axis near the cord line and varies with cross section and construction. The pitch of the belt and sheave is actually a theoretical point that relates to the more accurate, reliable, and useable effective diameter and effective length.

4. Belt Effective Length (Le): The effective length of a belt is the length about the effective outside diameter of a sheave at a specified tension. The effective outside diameter of a sheave is measured where the groove top width is a dimension as specified by RMA, ASAE or SAE standards. The effective length is obtained by adding the effective outside circumference of one sheave to twice the center distance between the two standard measuring sheaves at the standard measuring tension.

5. Nominal Belt Length (Ln). The nominal length is used to refer to the length and cross section of a specific belt, and can reflect the Outside Belt Length (La), the Inside Belt Length (Li) or the Belt Pitch Length (Lp) and can refer to units being in inches OR millimeters !
For example, an A38 has a nominal length of 38 inches, referring to its Li; but an SPA1280 has a nominal length of 1280mm, referring to its Lp. The nominal length is best considered as being for designation purposes.

With all the terms used, it is easy to see how identifying the proper belt-length can become confused!.

Sheave: A sheave is a wheel or roller with a groove along its edge for holding a belt, rope, or cable. The words sheave and pulley are sometimes used interchangeably. Multiple Rollers/Sheaves can be mounted on shafts and connected by belts to efficiently transfer rotational power from a power-source to a final-drivedestination or multiple final-drive destinations.

Vari-speed or Variable Speed arrangements: A sheave can also refer to a pulley which has an adjustable operating diameter for use with a mechanical belt (sometimes called a vari-speed belt). This is accomplished by constructing the pulley out of several pieces. The two main "halves" of the pulley (the angled faces) can be moved closer together or farther apart - this allows the v-belt (a wider-than-normal variable speed belt) to move higher or lower in the groove, thus altering the operational diameter, and the gearing & speed achieved. The usual construction is some sort of locking collar or set screws to secure the components, one half with a threaded central shaft and one half with a threaded center. By rotating the components one can "screw" the parts closer together or further apart, thus changing the distance between the two halves and allowing the belt to ride higher or lower in the grove. The adjustments are constrained to a specific range of size and are not limitless.

Warranty Information

Manufacturer's : and subject to our Terms of Return.

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