Spi 34-335-0 Plug Thread Gage 1-12 6H Single End No Go

Product Description

The SPI 34-335-0 is a single-end plug thread gage used to verify that internal threads do not exceed the maximum material condition. This is the No Go member of a Go/No Go gage set, meaning it checks the low tolerance limit of a threaded hole. The gage is designed for use with 1-12 thread size and is classified to the 6H standard for internal metric and unified thread tolerances. Manufactured from steel, it delivers the dimensional stability required for precision inspection work. A size 4 handle is required for use but is sold separately. NIST traceability certification is included, supporting quality documentation and calibration records.

This gage is intended for quality control and inspection applications in manufacturing, machining, and mechanical assembly environments. It is used to confirm that threaded holes in metal components meet specified tolerance limits before parts advance in production or are released for assembly. The single-end design is compact and straightforward to use at the bench or on the floor. Its ANSI and NIST compliance makes it suitable for shops that operate under documented quality management systems.

Key Features

• No Go plug gage checks that internal threads do not exceed maximum material limits
• Thread size: 1-12 unified thread
• Classification: 6H tolerance class for internal threads
• Steel construction for dimensional stability and durability
• NIST traceability certification included for calibration and quality records
• Meets ANSI and NIST standards
• Size 4 handle required, sold separately

Compatibility

Designed for use with size 4 thread gage handles sold separately. Intended for inspection of internal 1-12 unified threaded holes classified to 6H tolerance.

Installation Notes

Thread plug gages are used by machinists and quality control inspectors and require no installation in the traditional sense. Before use, confirm the correct handle size is secured to the gage shank per the manufacturer guidance. Do not force the No Go member into a threaded hole; if it enters, the hole is out of tolerance and should be flagged. Store the gage in a protected case away from contaminants to preserve calibration integrity.