XXH Timing Belts

XXH timing belts are the largest and heaviest pitch in the ANSI/RMA trapezoidal timing belt system. With a 1-1/4" (31.75mm) pitch, XXH belts are engineered for extreme-torque, high-horsepower industrial drives where maximum load capacity is required. These belts serve as a synchronous, positive-drive alternative to roller chain and gear drives in demanding applications such as mining equipment, large conveyors, heavy presses, steel processing, and bulk material handling systems.

XXH timing belts feature deep trapezoidal teeth, neoprene (rubber) bodies, heavy-duty fiberglass tensile cords, and nylon tooth facing. The 1-1/4" pitch provides the greatest tooth depth and shear strength of any standard trapezoidal profile, making XXH the belt of choice when XH (7/8" pitch) belts reach their load limits. Texas Belting stocks XXH timing belts for same-day shipping from Houston.

XXH Timing Belt Part Number Decoder

XXH timing belt part numbers follow the standard ANSI trapezoidal format. The digits before the profile code represent the pitch circumference in tenths of an inch, and the digits after represent the belt width in hundredths of an inch.

Standard Format: [Pitch Length]XXH[Width Code]

For XXH belts, the pitch length digits before "XXH" represent tenths of an inch. Place the decimal before the last digit: 700 = 70.0 inches, 1000 = 100.0 inches. The width code after "XXH" represents hundredths of an inch: 300 = 3.00", 400 = 4.00", 500 = 5.00". Texas Belting can cross-reference XXH part numbers across all major brands. Call 888-203-2358 or send us your part number for fast identification.

XXH Timing Belt Width Guide

XXH timing belts are manufactured in wide widths to handle the extreme loads these belts are designed for. Wider belts distribute more load across a greater tooth surface area, which is critical at this pitch size.

If your drive requires a width not listed here, contact Texas Belting. Some manufacturers offer custom or non-standard widths for XXH belts on a made-to-order basis.

XXH vs. Other Heavy-Duty Timing Belt Pitches

XXH is the largest standard trapezoidal pitch. The table below compares XXH to other heavy-duty timing belt options to help you determine whether XXH is the right choice or if a different profile could meet your requirements.

XXH belts deliver the highest load capacity of any standard trapezoidal timing belt. For new equipment designs, engineers sometimes evaluate 14M HTD or Poly Chain GT Carbon belts as modern alternatives with curvilinear tooth engagement and potentially narrower belt widths at comparable torque ratings. For replacement on existing XXH drives, always match the original profile and pitch exactly. See the Timing Belt Tooth Profiles Explained guide for a full comparison.

XXH Timing Belt Materials

XXH timing belts are manufactured almost exclusively in neoprene (rubber) construction due to the extreme loads and large physical size of these belts.

Neoprene (Rubber) XXH Belts

Standard XXH belts use a neoprene body with heavy-duty fiberglass tensile cords and nylon tooth facing. This construction provides the tensile strength, shear resistance, and dimensional stability required for extreme-torque drives. Neoprene XXH belts are resistant to oil, ozone, and moderate heat, making them suitable for most heavy industrial environments.

HNBR and Specialty Compounds

For elevated temperatures, chemical exposure, or applications requiring extended service life, some manufacturers offer XXH belts in HNBR (Hydrogenated Nitrile Butadiene Rubber) or other high-performance elastomers. These provide improved heat resistance and chemical compatibility at a premium cost. Contact Texas Belting for availability.

Urethane construction is not available for XXH belts due to the extreme loads involved. For applications requiring urethane or food-grade belts at heavy loads, explore urethane timing belts in HTD or AT profiles at smaller pitches with wider belt widths.

Common XXH Timing Belt Applications

XXH belts are specified for the most demanding synchronous drive applications in heavy industry. The large tooth pitch and deep tooth engagement transmit extreme torque without slippage, eliminating the lubrication and maintenance requirements of roller chain drives.

XXH belts are designed for low-speed, high-torque drives. They are not suited for high-speed applications. For moderate loads, consider XH (7/8" pitch) or H (1/2" pitch) belts. For a comparison of all available profiles, see the Timing Belt Selection Guide.

XXH Timing Belt Brands We Carry

Texas Belting stocks and sources XXH timing belts from the following manufacturers. We can cross-reference part numbers between brands to find the correct replacement belt for your equipment.

Not sure which brand to specify? Texas Belting's team can help you match the right XXH belt to your application. Request a quote or call 888-203-2358.

XXH Timing Belt FAQs