Assortment of thread gauges UNJ, UNJC, UNJF, UNJEF

UNJ, UNJC, UNJF and UNJEF are special designations for thread standards that stand out from the general group of UN (Unified National) gauges. These standards have found their use especially in the aviation industry within the Imperial System of Units, where high accuracy and reliability of thread connections are critical. Each of the named gauges has its own unique characteristics and specifications that determine the specific parameters of the thread. The use of these standards helps ensure the safety and reliability of connections, which are essential in the measurement and manufacture of precision components.

UNJ gauges and their modifications have become an integral part of the engineering world, providing a standardized basis for creating thread connections in aircraft, engines and many other industrial applications. Their special emphasis on precision and quality helps avoid problems with thread imperfections that can lead to costly repairs or operational hazards.

UNJ thread gauges: characteristics and specifications

Specifications: B.S.4084 & Gauging Practice Bs919(I)-2007 ASME B1.15-1995/SAE AS 8879. ISO 3161-1999 & Gauging ISO 15872-2017

Thread gauges UNJ rings | Thread gauges UNJ plugs

Manufacturer's range

What is the difference between gauges UNJ, UNJC, UNJF, UNJEF

The main difference between these gauges is the level of accuracy, the pitch of the thread and the areas of application. UNJ thread gauges are divided into varieties, similarly to other unified gauges. For example, UNJC uses a coarse diameter and is combined with a standard thread pitch similar to UNC (Unified National Coarse). UNJF uses a small diameter and thread pitch similar to UNF (Unified National Fine). UNJEF has an extra fine diameter and thread pitch similar to UNEF (Unified National Extra Fine).

UNJ thread gauges

UNJ gauges have a constant thread pitch and diameter similar to common unified gauges. This variety allows you to choose the optimal type of thread depending on specific requirements and application conditions. As in other industries, the diameter - thread pitch and series are similar to standard Unified Threads.

UNJ - Constant (uniform TPI series) similar to UN It is a thread standard with special tolerances and geometries, designed for high precision use in critical applications such as the aerospace and defense industries.

UNJC thread gauges

UNJC - Coarse diameter TPI combination similar to UNC This is an option with additional tolerance. UNJC is designed to facilitate the connection and assembly process while maintaining high accuracy.

UNJF thread gauges

UNJF - Fine diameter TPI combination similar to UNF It is distinguished by a smaller pitch of the thread, which makes it possible to achieve greater accuracy in thread connections. It is used, for example, in the automobile and machine-building industry.

UNJEF thread gauges

UNJEF - Extra fine diameter TPI combination similar to UNEF This is an even more precise thread with an even smaller pitch. It is used in highly specialized areas where high precision is required, such as in microelectronics or measuring devices.