Page 713 - Yamawa_European_Catalogue_YEU21

22. Basic Profile of Threads

Intro

American Standard Taper Pipe Threads (NPT) Truncation Unit: mm
SP
Threads
per inch Section fc = fr
Internal Max. 0.096P
Threads Threads per inch 27 Min. 0.033P
Max. 0.088P
18 SL
Min. 0.033P
Max. 0.078P
14
Min. 0.033P
Max. 0.073P
Central axis 11.5
External Threads line of thread Min. 0.033P
Max. 0.062P PO
8
Min. 0.033P
Dryseal American Standard Taper Pipe Threads (NPTF) Truncation Unit: mm
ST
Threads
per inch Section fc fr
Max. 0.094P 0.140P
Internal 27
Threads Threads per inch Min. 0.047P 0.094P
Max. 0.078P 0.109P ROLL
18
Min. 0.047P 0.078P
Max. 0.060P 0.085P
14
Min. 0.036P 0.060P
Central axis Max. 0.060P 0.090P
line of thread 11.5 CARBIDE
External Threads Min. 0.040P 0.060P
Max. 0.055P 0.076P
8
Min. 0.042P 0.055P
LONG
Metric Trapezoidal Screw Threads (Tr) 29˚ Trapezoidal Screw Threads (29 Tr)

HAND
TAPS
Internal
Thread

Internal EG (STI)
Threads

SPECIAL
External Threads
THREADS,
GAUGES
External Thread

d1 or D1 d2 or D2 d or D d1 D1 d2 or D2 d D THREAD
MILLS

DIES

Threads per inch
CENTER
DRILLS

Technical
info

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