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What is Pitch? What is a lead?

Pitch is the distance measured parallel to the axis between two points corresponding to adjacent chevrons in the shaft cross-section of the screw.

It is represented by P, and 1.5P refers to 1.5 pitches.

The lead is the distance between the beginning and end positions of the thread (parallel to the axis) when the thread is ro

No : 8309
Published : Modified : 2024/08/28 02:29
Category: Screws in general
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Sewing Screw (SM) JIS B 0226

The thread angle is 60 degrees.

Accuracy is 1, 2 and 3 grades, and size is inch size

e.g. SM1/8-44 SM1/4-40

There are standard products of taps and gauges.

Standard Yamagata

No : 8312
Published : Modified : 2024/08/28 02:29
Category: Screws in general
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Compare the difference in effective diameter Conventional JIS and ISO ・ Screw and screw gauge ・ external thread and internal thread    

The figure below shows the positional relationship between the thread accuracy, the thread and the thread gauge, external thread and

No : 9682
Published : 2021/10/04 13:00 Modified : 2024/08/28 02:29
Category: Screws in general
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What is an NPSM screw?

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.

(ANSI) ANSI B1.20.1

No : 8204
Published : 2020/11/02 13:49 Modified : 2022/04/15 13:48
Category: Screws in general
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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

No : 8202
Published : 2020/11/02 13:45 Modified : 2024/08/28 02:29
Category: Screws in general
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What is a G-thread?
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
No : 8199
Published : 2020/11/02 13:30 Modified : 2024/08/28 02:29
Category: Screws in general
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What is a PF screw?
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
No : 8198
Published : 2020/11/02 13:27 Modified : 2024/08/28 02:29
Category: Screws in general
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What is an RP thread?

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,

No : 8193
Published : 2020/11/02 13:14 Modified : 2024/08/28 02:29
Category: Screws in general
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What is a PS thread?
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
No : 8192
Published : 2020/11/02 13:13 Modified : 2024/08/28 02:29
Category: Screws in general
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What is an RC screw?
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
No : 8190
Published : 2020/11/02 13:09 Modified : 2024/08/28 02:29
Category: Screws in general

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