Full definition
International standard specifying the dimensions, tolerances, and designation system for synchronous (timing) belts and pulleys with trapezoidal (classical) tooth profiles. Covers imperial pitches: MXL (2.032 mm), XL (5.08 mm), L (9.525 mm), H (12.7 mm), XH (22.225 mm), and XXH (31.75 mm). ISO 5296 defines: belt tooth geometry (trapezoidal profile), tooth pitch, belt width, belt length designation, pulley groove geometry, and pulley diameter. The trapezoidal tooth profile was the original timing belt design and remains widely used, particularly in light-to-medium-duty applications, office equipment, and legacy installations. For new designs requiring higher load capacity, the curvilinear HTD profile (ISO 13050) and GT profiles (manufacturer-specific) are preferred due to their 40-70% higher load capacity and better tooth-jump resistance. Note: trapezoidal profile belts and pulleys are NOT interchangeable with HTD profile components even at the same pitch — the tooth shapes are fundamentally different. Per ISO 5296:2012. Related: ISO 13050 (HTD curvilinear profiles), and manufacturer-specific standards for GT/GT3 profiles (Gates PowerGrip GT).