The component code 0801350 (Coupling box) is installed in the opening and closing group of the main spindle bar clamping collet on Gildemeister GS20 / GM20 multi-spindle automatic lathes. Its mechanical function is to support proper coupling and smooth operation of the group components, ensuring operating stability and repeatable clamping/opening cycles. As it is listed among wear spare parts, replacement is typically required when play, wear or efficiency loss affects correct system operation. During service, it is recommended to check mating parts and related components within the group to prevent accelerated wear or incorrect adjustments. Tadaah provides specialized technical support for compatibility checks, correct spare part selection, and repair assistance.