Spi 34-200-6 Plug Thread Gage 1-72 2B No Go

Product Description

The SPI 34-200-6 is a single-end No Go plug thread gage designed to verify internal thread quality on 1-72 UNC fastener applications. Manufactured from steel to ANSI standards and traceable to NIST, this gage checks whether a threaded hole falls outside the acceptable tolerance range for 2B class fit. When the No Go member enters the thread, the hole is out of tolerance and must be rejected. Machinists, quality technicians, and inspection personnel use this gage in precision manufacturing environments where thread fit verification is a required process step. The size 000 handle is not included and must be sourced separately.

This gage is suited for inspection of small-diameter internal threads in production and job-shop environments. The 1-72 designation indicates a No. 1 screw size at 72 threads per inch, a fine-pitch thread common in miniature fastener applications found in instrumentation, electronics assembly, and precision mechanical assemblies. The 2B classification corresponds to the standard tolerance class for internal unified inch threads used in general-purpose applications. A compatible size 000 handle is required for proper use and is sold separately.

Key Features

• No Go member identifies out-of-tolerance internal threads at 1-72 UNC 2B class fit
• Steel construction provides durability for repeated inspection cycles
• NIST-traceable calibration supports quality documentation requirements
• Meets ANSI and NIST standards for thread gage accuracy
• Single-end design in a compact size 000 gage body
• Handle not included — accepts a standard size 000 plug gage handle

Compatibility

Designed for inspection of 1-72 UNC 2B class internal threads. Accepts a size 000 plug gage handle, which is not included with this gage.

Installation Notes

This gage is used by quality technicians and machinists during thread inspection — it is not an installed component. Before use, attach the gage to a compatible size 000 handle. Do not force the No Go member into a threaded hole; proper gage practice requires hand pressure only to avoid false readings or gage damage. Store in a clean, dry location and handle with care to preserve calibration integrity.