Vermont Gage 302145530 M20x1.5 6H Plug Thread Gage

Product Description

The VERMONT GAGE 302145530 is a double-end plug thread gage designed to inspect M20x1.5 internal threads to the 6H tolerance class. The Go member checks that a threaded feature meets the minimum material condition, while the No Go member verifies the maximum material limit is not exceeded. The Go pitch diameter is 19.02 mm and the No Go pitch diameter is 19.21 mm. A size 3 handle is included. The gage body is machined from tool steel for dimensional stability and wear resistance. Traceability certification to NIST standards is included with each unit, making this gage ready for use in documented quality-control programs.

This gage is used in manufacturing, machining, and assembly environments where M20x1.5 threaded holes must be verified to 6H class tolerances. Typical applications include inspection of tapped bores in mechanical assemblies, hydraulic components, and structural fastener holes. It is suited for incoming inspection, in-process quality checks, and final acceptance testing. Machinists, quality technicians, and toolroom personnel are the primary users. The double-end design places the Go and No Go members on opposite ends of a single handle, reducing tool changeover time during repetitive inspection tasks.

Key Features

• Double-end configuration with Go and No Go members on a single size 3 handle
• Go pitch diameter of 19.02 mm for minimum material condition verification
• No Go pitch diameter of 19.21 mm for maximum material condition verification
• Tool steel construction for wear resistance and dimensional stability
• NIST traceability certification included for quality documentation compliance
• Conforms to 6H tolerance class for M20x1.5 metric thread inspection

Compatibility

Designed for inspection of M20x1.5 metric internal threads manufactured to the 6H tolerance class as defined by ISO and ANSI thread standards.

Installation Notes

Thread plug gages are used by quality technicians and machinists and do not require permanent installation. Before use, clean the threaded bore and the gage members thoroughly to remove chips, coolant, and debris that could cause false readings. Apply a light coat of gage oil to the gage members to reduce wear during insertion. Never force the Go member through a threaded hole and never apply torque to the No Go member beyond hand pressure, as forced engagement can damage the gage and invalidate inspection results.