Spi 34-298-0 Plug Thread Gage 9/16-18 6H Single End Go

Product Description

The SPI 34-298-0 is a single-end Go plug thread gage designed for verifying internal thread dimensions to a 9/16-18 thread standard with a 6H tolerance class. Machined from steel, this gage is used to confirm that a tapped hole falls within the acceptable lower limit of the thread tolerance range. It is a size 3 handle gage — the handle is sold separately. NIST traceability is included, meaning each unit ships with a certification traceable to the National Institute of Standards and Technology. Machinists, quality control inspectors, and tool-room technicians rely on this type of gage to hold thread conformance on threaded assemblies.

This Go plug thread gage is suited for inspection of 9/16-18 UNF internal threads in production and quality assurance environments. Typical applications include verification of tapped holes in hydraulic fittings, fastener assemblies, and precision mechanical components where thread class 6H conformance is required. The gage is used as part of a Go/No-Go inspection process — this unit covers the Go function only and should be paired with a separate No-Go gage for full thread verification.

Key Features

• Go plug design checks that internal threads meet the minimum acceptable size for 9/16-18 6H thread class
• Steel construction provides durability for repeated use in production inspection
• NIST traceability certification included for documentation and audit compliance
• Conforms to ANSI standards for thread gage dimensions and tolerances
• Size 3 handle compatibility — handle not included, allowing use with existing handle inventory
• Single-end configuration for dedicated Go-function inspection

Compatibility

Designed for use with a size 3 thread gage handle (sold separately). Intended for inspection of 9/16-18 UNF internal threads classified to 6H tolerance.

Installation Notes

Thread plug gages are used by quality control inspectors and machinists — no installation in a mechanical system is required. Secure the gage into a compatible size 3 handle before use. Do not force the gage into a threaded hole; a Go gage should advance freely under hand pressure if threads are within tolerance. Store gages in a protective case and keep them clean and lightly oiled to prevent corrosion and maintain calibration integrity.