AT10 Timing Belts (10mm Metric Trapezoidal)

AT10 timing belts are 10 mm pitch metric trapezoidal synchronous belts cast in polyurethane over steel tension cords, with a wider, reinforced tooth than the older T10 profile for stiff, repeatable linear positioning. Texas Belting stocks 1,200+ AT10 belts, endless and open-end, across Megadyne Megalinear and Megaflex, Optibelt Alpha and BRECOflex-compatible lines in Houston, TX.

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On this page: Profile specs · Part numbers · AT10 vs T10 · AT10 vs HTD · Endless vs open-end · Stock lengths · Applications · FAQ

AT10 profile specifications

The AT10 profile is a 10 mm pitch trapezoidal tooth cast in polyurethane over steel tension cords: 2.5 mm tooth height, roughly 5 mm total belt thickness, a 50° included flank angle, and a 5 mm tooth tip width. The AT tooth is wider and fuller at the root than the T10 tooth it evolved from, which is what buys the extra tooth stiffness and load capacity.

Values are manufacturer-published data (Optibelt, BRECOflex). Brands vary slightly in belt thickness and minimum diameters; verify against the drive drawing before ordering.

The T10 profile it descends from is the DIN 7721 standard metric trapezoidal belt. AT10 was developed as a reinforced evolution of T10: a larger tooth cross-section, a heavier steel cord package, and a stiffer body, aimed at linear motion and positioning drives rather than light transport. Published operating range for standard polyurethane construction is about –30 to +80°C.

How do I read an AT10 part number?

An endless AT10 designation reads width, profile, pitch length: 25AT10/1050 is a 25 mm wide AT10 belt with a 1050 mm pitch length. Tooth count is pitch length divided by 10, so that belt has 105 teeth. Some brands reorder the same three values as AT10-1050-25; the belt is identical.

• 25AT10/1050: 25 mm wide, 1050 mm pitch length, 105 teeth. Also written AT10-1050-25.
• 50AT10/660: 50 mm wide, 660 mm pitch length, 66 teeth.
• 16AT10/780: 16 mm wide, 780 mm pitch length, 78 teeth.

Open-end AT10 drops the length term: it is called out by width and profile (for example AT10, 25 mm, per meter) and cut from rolls. To recover the size of a belt with an unreadable print, count the teeth and multiply by 10 for pitch length – do not measure around a belt that is stretched on a drive. Our belt length calculator and cross-reference tool cover the conversion work.

AT10 vs T10: what is the difference?

AT10 and T10 share the 10 mm metric pitch and nothing else that matters. The AT10 tooth is wider at the root with a 50° flank angle against T10's 40°, the belt section is thicker, and the steel cord line is heavier. Distributor-published comparisons credit AT-series belts with roughly 20–30% more load capacity than the same-pitch T-series belt, along with less tooth deflection under positioning loads.

Upgrading a T10 axis to AT10 is a legitimate way to gain capacity and stiffness, but it is a drive conversion: pulleys and belt change together. If the machine was designed around T10 and the loads have not grown, staying with T10 is usually the cheaper, correct call. Browse trapezoidal timing pulleys for both profiles, or see the stock timing belt pulley guide.

AT10 vs HTD 8M rubber synchronous belts

AT10 and HTD 8M solve different problems. HTD is a curvilinear round-tooth profile, typically molded in rubber with fiberglass cords, built to transmit rotary power through fans, pumps, and conveyor drives. AT10 is a trapezoidal polyurethane belt with steel cords, built to hold position in linear axes. The pitches (10 mm vs 8 mm) and tooth forms do not interchange in any direction.

Pick the polyurethane AT10 when the drive positions a load: steel cords give near-zero stretch, so a gantry homes to the same spot without periodic re-tensioning, and the PU body resists oil, many chemicals, and abrasion while shedding almost no dust. Pick rubber synchronous belts for rotary power transmission: they damp shock better, run quieter at speed, and cost less per unit of horsepower. Our HTD 8M guide and HTD 14M guide cover the rubber side, and urethane belting collects the PU side.

Endless or open-end: which AT10 do you need?

Endless AT10 belts are cast or welded into a loop and run closed drives: rotary transmissions and short linear stages where the belt returns over both pulleys. Open-end AT10 is cut from rolls and clamped at both ends of the moving carriage, which is how most long-travel gantries, vertical lifts, and door operators are built; travel is limited only by roll length, not by stocked loop sizes.

If the belt on your machine has clamped ends, order open-end stock and re-use or replace the clamp plates. We stock open-end timing belt rolls in AT10 and the other common profiles; the open-end timing belt guide covers cut length, clamping, and cord orientation in depth.

Common AT10 endless lengths

Stocked endless AT10 pitch lengths run from about 500 mm to over 2,000 mm, each available in multiple widths from the standard range. The table shows representative catalog sizes in the 25 mm width; the same lengths are made in 16, 32, and 50 mm widths, and tooth count is always the pitch length divided by 10.

Need a length or width that is not typical? The wider AT family, AT3 through AT20, covers finer and coarser pitches on the same design logic, and open-end rolls cover any travel an endless loop cannot.

Where AT10 belts run

AT10 is the workhorse profile for 10 mm pitch linear motion: CNC router and plasma gantries, pick-and-place and cartoning axes in packaging machinery, vertical lifts and automated storage shuttles, and door and slide drives. The common thread is a load that has to stop in the same place every cycle.

Positioning accuracy is the reason the profile exists. Steel cords hold length so the axis does not drift between tension checks, and the wide AT tooth deflects less under load than a T-profile tooth, which keeps backlash-driven position error small.

AT10 timing belt supplier in Houston, TX

Most stocked AT10 sizes ship same day from our Houston, TX warehouse, and quotes on specials, open-end cuts, and full drive packages typically come back the same business day. We serve automation builders, OEMs, and plants across the Texas Gulf Coast and ship nationwide. Call (888) 203-2358 to confirm availability.

Common AT10 selection mistakes

• Ordering by pitch alone. T10, AT10, and several 10 mm pitch profiles exist in the same plants. Matching the 10 mm pitch without matching the profile puts the wrong tooth in the groove; confirm AT vs T from the pulley stamp or a tooth-width check.
• Measuring a mounted belt instead of counting teeth. A belt measured around pulleys under tension reads long. Count teeth and multiply by 10 for the true pitch length.
• Ignoring minimum pulley and idler diameters. Steel-cord PU belts fail from cord fatigue when bent too tight, especially over backside idlers. Hold the published minimums.
• Re-using worn pulleys. Aluminum AT10 pulleys wear hollow-flanked under a steel-cord belt; a new belt in worn grooves quickly wears to match. Inspect grooves with the belt off.
• Replacing an open-end axis with an endless belt. Clamped-end drives need open-end stock cut to the drive, not the nearest endless loop. Check how the old belt terminates before ordering.

When to call

The specs above cover standard AT10 identification and replacement. Call for:

• Drive sizing from loads, speeds, and travel – we will spec profile, width, length, and cord
• Welded cleats, machined teeth, backings, or self-tracking profiles on AT10 stock
• Aramid, stainless, or high-flex cord availability in a specific width
• Open-end clamp hardware questions or a designation that fits no catalog pattern

Call (888) 203-2358 or send us what you have.

Frequently asked questions

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Last updated: July 2026