TFS Takasago Fluidic Systems

Thread Sizes

March 31, 2020

Thread Types

Commonly used threads having the triangular cross sections for fastening are the metric screw threads and the Unified screw threads. Based on the pitch of the thread, there are coarse threads and fine threads while the pitches of fine threads are shorter than the pitches of coarse threads.


Pipe threads are mainly used for the mechanical linkage to connect pipe parts and fluidic devices. There are two types of pipe threads, parallel threads and taper threads.


Followings are the thread sizes often used by us:

Metric Screw Threads

Coarse Threads: M5, M6, M12

Fine Thread: M8


Unified (Inch) Screw Threads

Unified Coarse (UNC): No.6-32UNC, No.10-24UNC

Unified Fine (UNF): No.10-32UNF, 1/4-28UNF


Pipe Threads

Taper Thread: Rc1/8, Rc1/4 ( R1/8 and R1/4 for the connecting pipe parts)

Parallel Thread: G1/8


*National Pipe Threads (US standard) are also available.

1/4-18NPT, 1/8-27NPT


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