Spi 34-417-6 Plug Thread Gage 3/4-10 2B Double End

Product Description

The SPI 34-417-6 is a double-end plug thread gage used to verify internal thread conformance to 3/4-10 UNC specifications at a 2B tolerance class. One end carries the Go member, the other carries the No Go member, allowing a technician to confirm both the minimum and maximum thread tolerance limits in a single tool. The gage ships with a size 3 handle included. It is constructed from steel and comes with a Traceability Certification traceable to NIST standards, making it suitable for quality-controlled inspection environments. Machinists, toolroom technicians, and QC inspectors use this type of gage on the shop floor or in an inspection lab.

This gage is applied wherever internal 3/4-10 UNC threads must be inspected for conformance — including threaded holes in manufactured components, weldments, castings, and assemblies. The 2B classification covers the standard tolerance class for the majority of commercial and industrial fastener applications. It is a common inspection tool in machining, fabrication, maintenance, and production quality control settings.

Key Features

• Double-end design combines Go and No Go members in one tool for efficient thread inspection
• Thread size: 3/4-10 UNC
• Tolerance class: 2B, the standard commercial fit for internal threads
• Steel construction for durability in production and inspection use
• Size 3 handle included — no separate handle purchase required
• NIST-traceable traceability certification included for quality system documentation

Compatibility

Designed for inspection of internal 3/4-10 UNC threaded features classified to 2B tolerance. Compatible with standard size 3 thread gage handles.

Installation Notes

Thread plug gages are installed and used by machinists, QC technicians, and toolroom personnel — no power tools or power shutoff is required. Insert the Go end into the threaded hole by hand; it should pass through without force. The No Go end should not enter more than two turns. Do not force either end of the gage, as this can damage the gage members or the threaded part being inspected. Store the gage in a clean, dry environment and handle with care to preserve calibration integrity.