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English Pitch Timing Belts

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About English Pitch Timing Belts

English pitch timing belts mate with same-pitch timing pulleys in power transmission systems where maintenance of speed ratio is an important design consideration. English pitch is the distance between belt teeth based on inches (in). With English pitch timing belts, a timing pulley transmits force to the belt via evenly-spaced grooves that mate with the teeth in the belt. These same grooves and teeth prevent belt slippage. Synchronous belt drives are highly-efficient devices. Synchronous belts come in a wide variety of materials and reinforcements. English pitch timing belts or imperial pitch timing belts have a trapezoidal tooth form.

ANSI pitch is the most important specification to consider when searching for English pitch timing belts. Pitch is the distance from one tooth center to the adjacent tooth center. English or imperial pitch is also referred to as H-pitch. Choices include 0.080" (MXL), 0.0816" (40 DP), 0.200" (XL), 0.375" (L), 0.500" (H), 0.875" (XH), and .250" (XXH). The geometry of English pitch timing belts is also important to consider. Belt width, number of teeth, and length are the most important geometric parameters. For a given pitch, a selected number of teeth will determine the belt length. Likewise, a specified belt length will determine the number of teeth in English pitch timing belts.

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Engineering Web: English Pitch Timing Belts

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