Starrett 234A-6 End Measuring Rod Insulated Handle Spherical Ends

Starrett 234A-6 End Measuring Rod is a 6-inch precision standard rod with an insulated handle and spherical ends, built from special tool steel. In the 1–6 inch size range, the rod diameter is 1/4 inch, with hardened, accurately lapped spherical ends to ensure a consistent contact surface. The insulated handle minimizes thermal expansion when held in the hand, helping maintain measurement stability during use. End Measuring Rods with spherical ends are used to check and set micrometers of 2 inches capacity and larger, and to compare gages or measure parallel surfaces on machine tools, making them a common reference in inspection, calibration, and setup tasks. The 234A-6 designation corresponds to a 6-inch length within Starrett’s family of end measuring rods, with other lengths available to suit longer or shorter reference checks.