Starrett 247B Micrometer Ball Attachment 0.200" Diameter for 0.270" Anvils and Spindles

The Starrett 247B is a precision ball attachment designed to expand the measuring capability of compatible micrometers. The hardened steel ball contact point measures 0.200" in diameter and is engineered to fit anvils and spindles with a 0.270" diameter, allowing for accurate measurement of grooves, curved surfaces, and other contoured features that a standard flat anvil cannot easily reach.

Key Features:

• Ball diameter: 0.200" for precise contact on concave and curved surfaces
• Compatible with micrometer anvils and spindles measuring 0.270" in diameter
• Hardened and ground steel construction for durability and measurement accuracy
• Simple slip-on installation — no tools required
• Manufactured by L.S. Starrett, a trusted name in precision measurement tools

The 247B is ideal for machinists, toolmakers, and quality control professionals who need to measure groove depths, root diameters, or other curved workpiece features. As with all Starrett accessories, this attachment is built to tight tolerances to ensure it does not compromise the accuracy of your micrometer readings.