1987989
Armature
Delco-Remy

The armature is a core electrical component that forms the rotating element of the starter or alternator, balancing magnetic and electrical performance in 12-volt systems. Important dimensions include a rear shaft outside diameter of 14.20 millimeters and a front shaft outside diameter of 15.80 millimeters, providing robust shaft geometry for reliable bearing operation. The armature accommodates 19 splines, enabling secure coupling with rotor windings and commutator assemblies. Its precise construction supports effective energy transfer and minimizes rotational losses, contributing to efficient starting torque or charging action as part of the broader system. In field service, a correctly matched armature preserves performance and avoids excessive wear on the commutator and brushes. VMRS code 031-001-002 places it in the starter/alternator armature category, with cross references guiding compatibility across various OEM configurations. Category context: essential rotating electrical assemblies, designed for durable operation in heavy-duty engines while maintaining consistent electrical performance.