Starrett 63688 Internal Chamfer Gage 0 to 3/8 in 3-blade

Product Description

The STARRETT 63688 is an internal chamfer gage designed to measure the included angle and depth of chamfers, countersinks, and beveled bores inside a workpiece. It uses a 3-blade plunger mechanism that seats directly into the chamfered feature, requiring no setting master for calibration. Measurement range spans 0 to 3/8 inches in depth with an included angle range of 90 to 127 degrees. The gage body is constructed from hardened tool steel with all ground surfaces for accuracy and durability. Machinists, toolmakers, and precision mechanics rely on this tool for in-process and final inspection of chamfered features on machined parts.

The STARRETT 63688 is suited for use in machine shops, production environments, and toolrooms where consistent chamfer verification is required. It is appropriate for inspecting internal chamfers on drilled, reamed, or bored holes in metal components. The 90 to 127 degree angle range covers the most common countersink and chamfer profiles used in standard machining practice. The tool ships with a deluxe padded case for storage and protection. Electronic indicator versions are available on request for applications requiring a digital readout.

Key Features

• 3-blade plunger design seats firmly in the chamfered feature for repeatable contact
• No setting master required — ready to use out of the case
• Hardened tool steel construction with all ground surfaces
• Covers included angles from 90 to 127 degrees
• White dial face for high-contrast reading
• Includes deluxe padded case for storage and transport
• Electronic indicator option available on request

Compatibility

Designed for internal chamfer measurement on machined components with included angles between 90 and 127 degrees and chamfer depths up to 3/8 inches. Compatible with standard countersink and chamfer profiles found in metal, plastic, and composite workpieces.

Installation Notes

This gage is a hand-held inspection instrument and does not require permanent installation. Before use, ensure the workpiece is secure and free of chips or burrs that could affect blade seating. Insert the 3-blade plunger squarely into the chamfered feature and apply consistent light pressure for accurate readings. No special tools or machine power-down procedures are required for normal gage operation.