Spi 34-284-0 Plug Thread Gage 7/16-28 2B No Go

Product Description

The SPI 34-284-0 is a single-end No Go plug thread gage designed to verify internal thread conformance to the 7/16-28 UN thread form at a 2B class of fit. Machined from steel, this gage checks that a tapped hole does not accept threads that fall outside the maximum material condition limit. A No Go gage that enters the threaded feature indicates the hole is out of tolerance. Traceability certification to NIST standards is included, supporting quality-control documentation requirements in precision manufacturing and inspection environments. A size 2 handle is required for use but is not included with this gage.

This gage is used by machinists, quality inspectors, and tool-and-die technicians performing thread inspection on parts with 7/16-28 internal threads. Typical applications include dimensional inspection of threaded components in precision manufacturing, aerospace, automotive, and industrial assembly operations where 2B class fit tolerances must be verified. The included NIST traceability certification supports use in calibrated inspection programs and ISO-compliant quality systems.

Key Features

• No Go member verifies that internal threads do not exceed maximum material condition for 7/16-28 2B class fit
• Steel construction provides durability and dimensional stability for repeated use
• Single-end configuration for dedicated No Go inspection
• NIST traceability certification included for calibrated quality-control programs
• Requires a size 2 handle, sold separately

Compatibility

Designed for inspection of internal threads conforming to the 7/16-28 UN thread form at 2B class of fit. A size 2 thread gage handle is required and must be sourced separately.

Installation Notes

Thread plug gages are used by qualified inspection personnel and should be handled with care to prevent damage to the gage member. Apply the No Go member by hand without force — a properly toleranced thread hole will not accept the No Go gage. Store gages in a protected case when not in use to prevent nicks or corrosion that could affect dimensional accuracy. Periodic recalibration against NIST-traceable standards is recommended to maintain inspection integrity.