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29. Basic profile of threads List of Thread Standards and Nominal Diameter Ranges of YAMAWA Taps29. Basic profile of threads

■American Standard Taper Pipe Threads (NPT) Thick Steel Conduit Threads (CTG)■Japanese

Truncation Unit : mm

Threads Thread symbols Kinds of threads Related Standards

Section fc=fr per inch Metric screw threadsInternal Thread Miniature screw threads Internal Unified threads, Coarse series

Thread Unified threads, Fine series27.5°27.5° Metric Trapezoidal screw threads55° External ThreadTaper external pipe threads (JIS main book) Taper internal pipe threads P (JIS main book) Central axis

External Threadline of threadH=0.960491PParallel internal pipe threads(JIS main book)
H 1 =0.560286PD=dParallel pipe threads(JIS main book)
d 2 =d-0.640327PD2 =d2P=25.4/n
d=d-1.120572PD=dParallel pipe threadsnThread per inch(JIS Appendix)
11 1==

Taper pipe threads (JIS Appendix) Parallel internal pipe threads (JIS Appendix) ■Dryseal American Standard Taper Pipe Threads (NPTF) Steel Conduit Threads (CTC) Screw threads for rigid metal thin-walled conduit and fitting

Truncation Unit : mm Threads Screw threads for rigid metal thick-walled conduit and fitting

Section fc fr

per inch Cycle threadsInternal Thread Screw threads for sewing machine (2001.2.20repeal) Internal Thread Electric socket and lamp-base threads40°

40° Tire valve threads of automobile80° External ThreadTire valve threads of cycle P

■ISO

Central axisH=0.59588Pd=d-0.87703P
line of thread1
External ThreadH=0.43851PD=d

1 Thread symbols Kinds of threads Related Standards

H 2 =0.09778PD2 =d2P=25.4/n
d=d-0.47670PD=dISO Metric threadsn=Thread per inch
21 1

ISO Miniature screw threads ISO Metric trapezoidal screw threads

  • Bicycle Threads (BC) ISO Unified threads, coarse series

■Metric Trapezoidal Screw Threads (Tr) ■29˚ Trapezoidal Screw Threads (TW)

ISO Unified threads, fine series ISO Unified threads, extra fine series ISO Unified threads, constant pitch seriesInternal Thread Aerospace - UNJ threads (coarse)r Aerospace - UNJ threads (fine)30° 30° Internal r Thread Aerospace - UNJ threads (extra fine) 60° External ThreadAerospace - UNJ threads (constant pitch series) Internal Aerospace - MJ threads Thread P Taper external pipe threads

H=0.8660Pd 1 =d-2H1
H=0.5327PD=dTaper internal pipe threadsD'
11 =d1+2×P/12
r=P/6D2 =d2Parallel internal pipe threadsP=25.4/n
External Thread d=d-HD=dn Thread per inch
211 1==

Parallel pipe threads Glass container threads External Thread

  • Tire Valve Threads (TV), Bicycle Tire Valve Threads (CTV)Tire valve threads

Internal Thread

30° 30° 60° External Thread P Technical Inf H =0.866025P

H1 =0.541266PD=d
d2 =d-0.649519PD2 =d2P=25.4/n
d=d-1.082532PD=dn=Thread per inch