ねじ全般 | オーエスジー

ANSI is a combination of external thread , internal thread and parallel threads with a relatively precise fit in the machine coupling.
The accuracy is similar to G A class, but there is a gap of 0.03 or more, and it is Unified 2A and 2B grade.

What is an NPTF thread?

It is an ANSI standard tapered thread.
Compared to NPT, it has excellent density resistance, and it has a chevron shape that can ensure density resistance without using a sealant.
NPTF external threads can be used not only with NPTF female threads but also with NPSF and NPSI.
Thread angle: 60 degrees
0.5/16 taper per side

It is a screw commonly called a parallel screw for JIS (ISO) pipes, and it is a parallel screw for mechanical coupling of the current JIS standard. （JIS B 0202）
・Both the male and female threads are represented by G.
・ It is the G thread that fits into the G internal screw.
・Thread angle is 55 degrees
・The name is expressed in inches, and th

It is a screw commonly called a parallel screw for JIS (English type) pipes, and it is a parallel screw for mechanical coupling of the old JIS standard. （JIS B 0202）
・Both the external and female threads are referred to as PF.
・It is the PF thread that fits into the PF female thread.
・Thread angle is 55 degrees
・The name is expressed in inch

It is a thread commonly called a parallel thread for JIS (ISO) pipes, and it is a parallel internal thread for tight coupling. （JIS B 0203）

Rp is a thread symbol used only for internal threads.
・The thread that fits into the Rp is a tapered screw for R (ISO) pipes.
・Thread angle is 55 degrees
・The name is expressed in inches,

It is a thread commonly called a parallel screw for JIS (English type) pipes, and it is a parallel thread for tight coupling of the old JIS standard. （JIS B 0203）
・Female threads are referred to as PS.
・For the internal thread of the PS, the male screw that fits together is PT (taper).
・Thread angle is 55 degrees
・The name is expressed in i

It is a thread commonly called a tapered thread for JIS (ISO) pipes, and it is a tapered internal thread for tight bonding. （JIS B 0203）
・Female threads are denoted as Rc. The threads that fit together are R (taper).
・Thread angle is 55 degrees
・The name is expressed in inches, and the pitch is expressed in the number of mountains between 25.4

It is a thread commonly called a tapered screw for JIS (English type) pipes, and it is a tapered thread for tight coupling of the old JIS standard. （JIS B 0203）
・Both the external and female threads are denoted as PT.
・In contrast to the PT tapered thread, the fitting female screw is PT (tapered) or PS (parallel).
The thread angle is 55

A trapezoidal screw with a thread angle of 29° according to the American and British standards.
The outer diameter of the external thread is the fraction of an inch, and the pitch is the number of chevrons per inch.