Spi 34-230-3 Plug Thread Gage 6-40 2B Single End No Go

Product Description

The SPI 34-230-3 is a single-end No Go plug thread gage designed for inspecting 6-40 UNC internal threads to 2B tolerance class. Machined from steel, this gage is used to verify that a threaded hole does not exceed the maximum material condition limit — meaning the No Go member should not enter the part. It is a precision inspection tool intended for quality control environments, machine shops, and production floors where thread conformance to NIST-traceable standards is required. A size 0 handle is needed for operation but is sold separately.

This gage is suited for inspecting small-diameter internal threads in metal components across manufacturing and assembly operations. The 6-40 thread designation is common in instrument, electronics, and precision mechanical applications where fine thread engagement is critical. The 2B classification covers the standard tolerance range for inch-series internal threads used in general-purpose fastening. Machinists, quality technicians, and inspection personnel use this gage as part of a go/no-go thread verification process on production or incoming parts.

Key Features

• No Go member checks maximum material condition limit for 6-40 internal threads
• 2B class tolerance — standard fit for general-purpose inch-series internal threads
• Steel construction for durability in production inspection use
• NIST-traceable calibration standard included for documentation and compliance
• Single-end design; accepts size 0 handle (handle not included)
• UNSPSC Code 41111619 for procurement classification

Compatibility

Designed for use with size 0 plug thread gage handles; handle is not included and must be sourced separately. Applicable to inspection of 6-40 UNC 2B internal threaded features in precision components.

Installation Notes

Thread gages are inspection tools, not cutting tools — do not force the No Go member into the part. Handle must be attached securely before use; inspect the handle collet and gage shank for wear or damage before each use. Store gages in a protective case away from other tooling to prevent contact damage to the thread form. Calibration should be verified periodically against NIST-traceable masters per your facility quality plan.