Spi 34-409-3 Plug Thread Gage 9/16-24 2B Double End

Product Description

The SPI 34-409-3 is a double-end plug thread gage used to inspect and verify internal thread quality to the 9/16-24 thread specification at a 2B tolerance class. One end carries the Go member and the other carries the No Go member, allowing a technician to confirm both the minimum and maximum thread tolerance conditions in a single tool. The gage is constructed from steel and ships with a size 3 handle included. A Traceability Certification traceable to NIST standards is included with the tool, supporting quality documentation requirements in production and inspection environments.

This gage is used in precision manufacturing, aerospace, automotive, firearms, and general machining shops wherever 9/16-24 internal threads must be inspected to 2B class tolerances. The double-end design consolidates Go and No Go inspection into a single tool, reducing handling time during incoming inspection, in-process checks, or final quality verification. It is well suited for quality control technicians, machinists, and inspection departments that require NIST-traceable documentation for their gaging equipment.

Key Features

• Double-end design combines Go and No Go members in one tool for efficient thread inspection
• 9/16-24 thread size with 2B tolerance class per ANSI/ASME unified thread standards
• Steel construction for durability and dimensional stability under repeated use
• Size 3 handle included — no separate handle purchase required
• NIST Traceability Certification included to support quality system documentation

Compatibility

Designed for inspection of internal 9/16-24 threads manufactured to 2B class tolerances in accordance with unified inch screw thread standards.

Installation Notes

Thread gages should be handled and stored carefully to prevent damage to the thread members. Before use, clean the gage and the part threads to remove chips, oil, or debris that could affect the reading. Apply the Go member first; it should pass through the full length of the thread under hand pressure only — never force a plug gage. The No Go member should not enter the thread; if it does, the thread is out of tolerance. Periodic recalibration by a qualified metrology lab is recommended to maintain traceability and measurement integrity.