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Ojiyas makes many different types of unified thread gauges:
Ojiyas UN Thread Plug Gauge – Unified Fixed Pitch
Commonly used: With 4, 6, 8, 12, 16, 20, 28 & 32 standard thread per inch.
Ojiyas UNC Thread Plug Gauge – Unified Coarse
The most commonly used thread type for fasteners, General purpose inch gauging, lower tensile strength materials. Due to the inherent coarse pitch, the thread is deeper than UNF and easier to install without cross-threading.
Ojiyas UNF Thread Plug Gauge – Unified Fine
The external thread is stronger in tension than the coarse thread due to the lesser thread depth compared to UNC and it has finder tension adjustment and tighter tolerance. It is commonly used in the aerospace industry.
Ojiyas UNEF Thread Plug Gauge – Unified Extra Fine
Finer thread compared to UNF and it is used for very special applications such as tapped-in thin wall material and tapped holes material.
Ojiyas UNJC & UNJF Thread Plug Gauge
Similar thread form with UNC and UNF except that the outer thread has a larger root radius compared to UNC or UNF thread. This results in a larger tensile area and smaller stress concentration.
Keen to find out more about Unified Thread Gauges? Learn more about them here.
Ojiyas (Ojiya Seiki Co., Ltd.) manufactures high-quality thread gauges, measuring gauges, and various inspection jigs. The company pursues a high level of precision manufacturing technologies and measurements to produce high-quality products. Ojiyas products are widely used in various industries – automotive, aerospace, bicycle, etc.
Ojiyas gauges undergo heat treatment to attain maximum hardness and increase their resistance to corrosion.
Sub-zero treatment of gauges changes the phase structure and improves the gauge’s quality and performance. Ojiyas gauges undergo professional sub-zero treatment for better wear resistance & dimensional stability.
You can find out more about the complete Ojiyas range of products by viewing the Ojiyas Catalog on our support page. LFC is the authorized distributor for Ojiyas in Singapore and Indonesia. Contact us if you wish to discuss your gauging applications further.
In unified thread the thread pitch measurement are count of number of thread per inched along the length of a thread. Generally thread per inch used in Unified thread while Thread pitch are used in Metric thread.
The class for Unified Thread are designated by letter ‘A’ & ‘B’. Thread Plug Gauge is ‘B’ while Thread Ring Gauge is ‘A’. Therefore tolerance classes 1A,2A and 3A apply to Thread Ring Gauge and Tolerance classes 1B,2B and 3B apply for internal threads. Most commonly used are the Class 2A and 2B.
Parallel Thread Specifications
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