Thread plug gauge

Thread type




Threaded end plug gauge


Function: Check the working diameter and major diameter of the internal thread of the workpiece;


Usage rule: It should be screwed into the internal thread of the workpiece.


Thread stop plug gauge


Function: Check the single pitch diameter of the internal thread of the workpiece;


Usage rules: It is allowed to rotate with the threaded parts at both ends of the workpiece's internal thread, and the amount of rotation should not exceed pitch; For internal threads of workpieces with 3 or less pitches, they should not be completely screwed through.



Produce and process thread types


Metric thread, unified thread for British and American systems

Processing range


Nominal diameter 5mm-185mm

Technical Features

Compared to standardized products, our plug gauges can be designed, developed, and manufactured according to the unique needs of users;

It can also be modified according to requirements, breaking the conventional design and providing users with personalized customized solutions to improve the service life of inspection tools from multiple aspects, reducing costs and increasing efficiency for users:


① Strict size control, compression of gauge manufacturing tolerances, processing according to upper tolerances, thereby increasing wear and improving the service life of gauges;


② Using high-speed steel materials with high hardness, high wear resistance, and high heat resistance to improve the service life of inspection tools;

③ Adopting internationally advanced coating technology and equipment to further enhance the service life of the measuring tools;


④ Advanced CNC machining equipment in China ensures the machining accuracy and dimensional stability of the gauges, and the measured thread pitch diameter error is within 0.005mm.


Testing equipment


Adopting advanced testing equipment to ensure the quality of inspection tools


Mal profilometer detects small diameter, angle, and pitch

Mal length gauge for detecting thread pitch diameter



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