Resources
Standards
MPTA B1c – Bore and Keyway Tolerances for V-Belted Sheaves (MPTA-B1c-2010 R2025)
MPTA-B1c-2010 R2025 establishes standard dimensions for keyways and setscrews used in power transmission hubs and bores. By defining consistent keyway widths, depths, and setscrew placements, this standard promotes interchangeability and reliable performance across manufacturers. It applies to a range of bushing, pulley, and hub types commonly used in mechanical power transmission systems, ensuring compatibility between components from different producers.
MPTA B2c – Standard Practice Sheave / Pulley Balancing (MPTA-B2c-2017-R2024)
The MPTA-B2c-2017 (R2024) Standard Practice for Sheave/Pulley Balancing establishes balance tolerances and methods for power transmission sheaves and pulleys. It covers both one-plane (static) and two-plane (dynamic) balancing, ensuring smooth operation, reduced vibration, longer bearing life, and optimal performance.
The standard applies to sheaves and pulleys used with V-belts and synchronous belt drives and includes detailed formulas for determining acceptable unbalance based on product size, material, and operating speed.
MPTA B4c – Standard Surface Finish for Transmission Pulleys (MPTA-B4c-2008 R2024)
The MPTA-B4c-2024 Standard Surface Finish for Transmission Sheaves & Pulleys defines the maximum allowable surface roughness for key areas of transmission sheaves and pulleys before coating. The standard covers v-groove sheaves, cylindrical (flat) pulleys, and synchronous pulleys, providing uniform reference values for manufacturing and inspection. Surface roughness measurements are aligned with ASME-B46.1. This document helps ensure consistent performance, interchangeability, and product quality across manufacturers.
MPTA B6c – Quick Detachable Bushing and Mating Hub (MPTA-B6c-2020)
The MPTA-B6c-2020 Quick Detachable Bushing & Mating Hub Standard establishes dimensional guidelines and tolerances for inch and metric QD bushings and hubs. This ensures interchangeability among products from different manufacturers. Covering bushing and hub geometries, fastener requirements, and mounting arrangements, the standard applies to systems featuring external flanges, split designs, and ¾-inch-per-foot tapers on diameter. It includes detailed data tables for both inch and metric configurations, promoting consistent performance and compatibility throughout the industry.
MPTA B7i – Calculation of V-Belt Tensions And Shaft Loads (MPTA-B7i-2024)
MPTA-B7i-2024 provides standardized methods for calculating and measuring belt tensions, shaft loads, bearing loads, and overhung loads in two-sheave locked-center V-belt drives. This updated edition defines clear formulas and procedures for both static and dynamic conditions, helping engineers optimize performance, extend component life, and ensure safe operation. By standardizing calculation methods, it improves communication and consistency among designers, users, and manufacturers.
MPTA B8i – Sheave Arm Stress Formula (MPTA-B8i-2011 R2016)
MPTA-B8i-2011-R2016 presents formulas for calculating bending stresses in the arms of V-belt sheaves. The standard identifies variables affecting stress—such as torque, belt tension, sheave geometry, and arm design—and establishes consistent methods for evaluating strength and safety margins. These calculations help manufacturers and engineers ensure that sheave designs meet performance and durability requirements while maintaining compatibility across the industry.
MPTA B9i – Taper-Lock Bushing & Mating Hub Standard (MPTA-B9i-2020)
MPTA-B9i-2020 defines the general dimensions and tolerances for Taper-Locking bushings and their mating hubs. Designed to promote interchangeability between manufacturers, it standardizes systems featuring an 8-degree included taper and full-length split bushings. The document includes complete dimensional data for bushings and hubs from size 1008 through 120100, helping ensure consistent fit, performance, and manufacturing alignment across the mechanical power transmission industry.
MPTA B10i – Split Taper Bushing Standard (MPTA-B10i-2020)
MPTA-B10i-2020 establishes dimensional data and tolerances for Split Taper bushings and mating hubs used in mechanical power transmission. It provides detailed reference tables to ensure that bushings and hubs from different manufacturers are fully interchangeable. Covering key features such as taper, keyway, flange, and fastener dimensions, this standard supports consistency, safety, and compatibility across a wide range of drive systems.
MPTA B13i – Rim Speed Limits Standard (MPTA-B13i-2013 R2025)
The MPTA-B13i-2013 R2025 – Rim Speed Limits standard provides guidance on the maximum allowable rim speeds for industrial V-belt sheaves and synchronous belt pulleys. Based on material type and construction, the standard defines recommended operating limits to ensure safe, reliable performance, and includes a conversion formula for calculating rotational speed (RPM) from rim speed (FPM).
MPTA C1c – Elastomeric Coupling Glossary of Terms (MPTA C1c-2014 R2024)
This standard is a listing of commonly used terms as compiled by the members of the elastomeric coupling industry. It contains the definitions of these terms as they apply to elastomeric couplings.