Spi 34-199-0 Plug Thread Gage 1-72 Single End Go

Product Description

The SPI 34-199-0 is a single-end Go plug thread gage designed to verify internal thread acceptance on 1-72 unified fine (UNF) threaded holes. Machined from steel, this gage checks whether a tapped hole meets the minimum tolerance threshold required for a conforming thread. It is used in production inspection, quality control, and field verification by machinists, tool and die workers, and precision fabricators. The gage is NIST-traceable and conforms to ANSI standards, making it suitable for documented inspection processes. A size 000 handle is required for use but is not included with this gage.

This gage is intended for use on small-diameter 1-72 threaded components common in precision mechanical assemblies, instrument manufacturing, electronics hardware, and fine-fastener applications. The single-end Go design confirms that the thread form and pitch diameter fall within the acceptable lower limit, allowing a conforming part to pass. It is appropriate for both shop-floor inspection and incoming or outgoing quality checks where traceability to NIST standards is required.

Key Features

• Go member only — single-end design for accept/reject inspection of 1-72 internal threads
• Steel construction for durability and dimensional stability under repeated use
• NIST-traceable calibration certification included for documented QC processes
• Conforms to ANSI and NIST thread gage standards
• Size 000 handle compatible — handle sold separately
• Compact single-end form reduces handling time in high-volume inspection workflows

Compatibility

Designed for use with size 000 thread gage handles (not included) and intended for inspection of 1-72 UNF internally threaded components in accordance with ANSI standards.

Installation Notes

Thread plug gages are installed and operated by quality technicians, machinists, or inspection personnel — no special tools are required beyond a compatible handle. The gage should be inserted by hand with light, steady pressure; never force or spin the gage into a thread, as this can damage both the gage and the workpiece. Store gages in a protective case away from other tooling to prevent nicking or corrosion on the precision ground surfaces. Periodic recalibration per your facility quality management plan is recommended to maintain traceability.