Общий каталог Yamawa 2022 - 2023 - страница 690

JIS SIT

Simple Thread

Inspection Tools

Specification

For GO （GB）

For NOT GO（NB/WB）

■ Specification of SIT is available up to M48 (U1 3/4). For details, please contact us.

Product Features Angle

• Blue color for GO and red color for Not Go are used for easy identification and storage.

●Utilizing a high grade of HSS material, the guage life has increased significantly.

• By using a stepped threads or tapered threads design at the front end of screw thread section, the problems in inspection were reduced while the work efficiency was improved. Tapered screw The tip of SIT gauge is easy to insert into an internal screw thread as the thread height thread details. gradually becomes larger. This is particularly effective when inspecting fine pitch threads.
• Note: Stepped threaded design is not used for Not Go.

Go and Not Go notations

These notations conform to the "gauge symbol" of JIS standards. ■Metric thread ■Unified thread

Internal Thread Pitch Diameter Not GO thread plug gauge for work WP

Both metric screw threads and unified screw threads are Internal pitch diameter gauge

For internal with ISO while the unified screw threads have been specified as it thread diameter Tolerance domain was before the introduction of ANSI standard.

6H 2B

Accuracy of SIT

The single pitch diameter tolerance, the thread pitch tolerance and the threads half angle tolerance are important in

the internal thread accuracy measurement and are manufactured using the same accuracy of thread plug gauges.

The screw thread precision is the same as a thread gauge, but some of the specifications like length of screw thread portion and the relief shape of the thread root are originated by YAMAWA. Therefore, these gauges are not to be called "thread gauge" and distinguished as "simple inspection tools for internal screw threads".