Emuge L0100100.5639 Plug Thread Gage 1/4-28 Sti 2B

Product Description

The EMUGE L0100100.5639 is a double-end plug thread gage designed to inspect 1/4-28 STI (Screw Thread Insert) internal threads to Class 2B tolerance standards. One end carries the Go member and the other the No Go member, allowing a technician to verify both the minimum and maximum thread tolerance in a single tool. Manufactured from tool steel with a bright, uncoated finish, this gage is built for durability on the shop floor or in the field. A handle is included, and a short-form certification ships with each unit. The gage conforms to ASME B1.2, the governing standard for inch-series thread gages.

This gage is used wherever STI threaded inserts are installed and the resulting internal thread must be verified before a fastener or assembly is accepted. Typical applications include aerospace, automotive, and industrial maintenance environments where Heli-Coil or equivalent thread inserts are used to repair or reinforce tapped holes. The right-hand, 1/4-28 thread form makes this gage appropriate for fine-pitch fastener applications across a wide range of materials and component sizes. Installation shops, machine shops, and MRO operations use this type of gage as part of a standard thread inspection workflow.

Key Features

• Double-end design provides Go and No Go inspection in one tool
• Gauges 1/4-28 STI internal threads to Class 2B tolerance per ASME B1.2
• Tool steel construction for wear resistance and dimensional stability
• Bright, uncoated finish - no coating thickness to account for in calibration
• Handle included for immediate use out of the box
• Short-form certification included with each unit

Compatibility

Designed for inspection of right-hand 1/4-28 STI internal threads conforming to Class 2B tolerance per ASME B1.2.

Installation Notes

Thread gages are typically used by machinists, quality technicians, or field service professionals as part of a thread inspection or acceptance procedure. Before gaging, ensure the threaded hole is clean and free of chips, coolant, or debris that could affect readings. The Go member should pass through the full thread length under hand pressure only; never force a plug gage. Store gages properly and have them recalibrated periodically to maintain traceability, as this unit ships uncalibrated.