Full definition
International standard for V-belts — the primary global specification defining dimensions, tolerances, length designation, and testing requirements for both classic (Z, A, B, C, D, E) and narrow/metric (SPZ, SPA, SPB, SPC) V-belt profiles used in industrial power transmission. Key specifications: belt cross-section dimensions (top width, height, effective angle), length designation methods (datum length Ld for narrow profiles, effective length Le for classic), length tolerances, and matching requirements for belt sets. ISO 4184 ensures interchangeability: a belt meeting ISO 4184 SPA specifications from any manufacturer will fit an SPA pulley from any other manufacturer. The standard complements: DIN 7753 (German V-belt standard — largely harmonized), RMA IP-20 (classic profiles, US), and RMA IP-22 (narrow profiles, US). For purchasing in Mexico and LATAM: belts are commonly specified by "perfil SPB, longitud primitiva 2500 mm per ISO 4184" or equivalent. All major belt manufacturers (Gates, Optibelt, Continental, Mitsuboshi, Bando) certify compliance with ISO 4184. Per ISO 4184:2006. Related standards: ISO 4183 (V-belt pulleys — groove dimensions) and ISO 1081 (V-belt drive design).