Omega Products BT40 Test Arbor - 40mm Diameter - 300mm Gauge Length RPTECH helping to prevent clogging and

helping to prevent clogging and ensure clean slot walls

while the 8mm diameter covers a wide range of milling applications

By pairing precise diameter control

smooth corner finishes on mold and die components

Omega Products BT40 Test Arbor - 40mm Diameter - 300mm Gauge Length RPTECH helping to prevent clogging andThe Omega BT40 Test Arbor is a precision master mandrel designed for BT40 tooling, delivering a stable reference for tool holder alignment and fixture setup. Its ideal for engineers, machinists, and workshop technicians who need reliable runout checks and repeatable setups in milling and turning environments. Built to the BT MAS403 standard and compatible with JIS 6339, this 40 mm diameter test arbor features a long 300 mm gauge length for versatile