Starrett 63708 Countersink Gage 100 Degree 0.36-0.56 in

Product Description

The STARRETT 63708 is a 100-degree countersink gage designed to verify the angle and diameter of countersunk holes in metalworking, machining, and fabrication applications. The gage measures countersink openings from 0.36 to 0.56 inches and features a white dial face for clear, high-contrast readings in shop environments. The hardened tool steel construction resists wear under repeated use. A set master ring is included to establish a calibration reference before use. This instrument is typically used by machinists and tool-and-die professionals who require accurate verification of countersink geometry on drilled or milled parts.

This gage is suited for inspection and quality-control tasks in precision machining shops, production environments, and maintenance facilities. It is commonly used to check 100-degree countersinks on flat and curved workpiece surfaces before fastener installation. The included set master ring allows the technician to zero the dial to a known standard, ensuring consistent and repeatable measurements across multiple parts or operators.

Key Features

• 100-degree countersink angle measurement for standard aerospace and industrial countersink profiles
• Measurement range of 0.36 to 0.56 inches for small-to-mid-range countersink diameters
• White dial face provides high-contrast readability under typical shop lighting
• Hardened tool steel construction for durability and long service life in production environments
• Includes a set master ring for on-bench calibration and zeroing

Compatibility

Designed as an OEM-style precision inspection gage for use with 100-degree countersinks within the 0.36 to 0.56 inch diameter range on machined metal parts.

Installation Notes

This gage is a hand-held inspection instrument, not a permanently mounted component. Before use, set the master ring on a clean, flat surface and zero the dial to establish the calibration reference. Inspect the workpiece surface for burrs or debris that could affect seating of the gage contact points and produce erroneous readings. Store the gage in its case when not in use to protect the dial mechanism and contact surfaces.