Starrett 234A-25 End Measuring Rod with Rubber Insulating Handle Straight Edge Tool - 25

The Starrett 234A-25 is a 25-inch end measuring rod, also known as a micrometer standard, designed for checking and setting micrometers of 2-inch capacity and larger. It is also widely used on machine tools for comparing gages, verifying precision measuring instruments, measuring parallel surfaces, and a variety of other precision layout and inspection tasks.

Key Features:

• 25-inch range — sized for use with 26-inch micrometers and similar large-capacity instruments
• Special tool steel construction — rod form with ends hardened and accurately lapped to a precise spherical radius for reliable, repeatable contact
• Rubber insulating handle — minimizes heat transfer from the user's hand to the rod, reducing thermal expansion errors and maintaining measurement accuracy
• Comfortable grip — the rubber handle provides a secure, non-slip hold during extended use
• Spherical ends — ensure consistent point contact regardless of alignment angle, contributing to accurate readings
• Part of the Starrett 234 series — the same standard supplied with Starrett micrometers from the factory

Starrett has been manufacturing precision tools in Athol, Massachusetts since 1880. The 234 series end measuring rods are trusted by machinists, toolmakers, and quality control professionals worldwide for their accuracy and durability.