List of thread standards

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A screw thread, often shortened to thread, is a helical structure used to convert between rotational and linear movement or force. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a tapered thread. More screw threads are produced each year than any other machine element.[1]

Threads are generally produced according to one of the many standards of thread systems. Standards Development Organizations such as the American National Standards Institute, American Society of Manufacturing Engineers, SAE International, International Organization for Standardization, Deutsches Institut für Normung (German Institute for Standardization), British Association and others produce these standards for Manufacturer's to follow when producing threaded components.

Currently used thread standards[edit]

Standard Name Type
ANSI/ASME B1.1-2003 Unified Inch Screw Threads (UN and UNR Thread Form) V Thread Form
ASME B1.5-1997 (R2009) Acme Screw Threads Trapezoidal Thread Form
ANSI/ASME B1.9-1973 (R2001) Buttress Inch Screw Threads Breech-Lock Thread Form
ANSI/ASME B1.10M-1997 Unified Miniature Screw Threads V Thread Form
ANSI/ASME B1.11-1958 (R2001) Microscope Objective Thread V Thread Form
ASME B1.13M-2005 Metric Screw Threads: M Profile V Thread Form
ASME B1.15-1995 Unified Inch Screw Threads (UNJ Thread Form) V Thread Form
ANSI/ASME B1.20.1-1983 (R2006) Pipe Threads, General Purpose (Inch) Pipe Thread Form
ANSI B1.20.3-1976 (R2003) Dryseal Pipe Threads (Inch) Pipe Thread Form
ANSI/ASME B1.20.7-1991 (R2003) Hose Coupling Screw Threads - Inch Pipe Thread Form
ANSI/ASME B1.21M-1997 (R2003) Metric Screw Threads - MJ Profile V Thread Form
ISO 68-1:1998 ISO general purpose screw threads—Basic profile—Part 1: Metric screw threads V Thread Form
ISO 68-2:1998 ISO general-purpose screw threads—Basic profile—Part 2: Inch screw threads V Thread Form
ISO 261:1998 ISO general purpose metric screw threads—General plan V Thread Form
ISO 262:1998 ISO general purpose metric screw threads—Selected sizes for screws, bolts and nuts V Thread Form
ISO 724:1993 ISO general-purpose metric screw threads—Basic dimensions V Thread Form
ISO 725:2009 ISO inch screw threads—Basic dimensions V Thread Form 51386
Edison Thread DIN 40400 Round V Thread Form

Obsolete thread standards[edit]

Standard Name Type Obsolescence date
BS 93:1951 British Association (B.A.) screw threads with tolerances for sizes 0 B.A. to 16 B.A. 1966[2]
BS 93:2008 British Association (B.A.) screw threads 1966[3]

See also[edit]

Sizes[edit]

Thread
nominal size
Outer diameter
[mm (in)]
Threads per inch
(TPI)
Pitch
[in (mm)]
Inner diameter
[mm (in)]
Cable diameter
[mm (in)]
PG7 12.5 (0.492) 20 0.05 (1.270) 11.28 (0.444) 3 to 6.5 (0.118 to 0.256)
PG9 15.5 (0.610) 18 0.05556 (1.4112) 13.86 (0.546) 4 to 8 (0.157 to 0.315)
PG11 18.6 (0.732) 18 0.05556 (1.4112) 17.26 (0.680) 5 to 10 (0.197 to 0.394)
PG13.5 20.4 (0.803) 18 0.05556 (1.4112) 19.06 (0.750) 6 to 12 (0.236 to 0.472)
PG16 22.5 (0.886) 18 0.05556 (1.4112) 21.16 (0.833) 10 to 14 (0.394 to 0.551)
PG21 28.3 (1.114) 16 0.0625 (1.5875) 26.78 (1.054) 13 to 18 (0.512 to 0.709)
PG29 37.0 (1.457) 16 0.0625 (1.5875) 35.48 (1.397) 18 to 25 (0.709 to 0.984)
PG36 47.0 (1.850) 16 0.0625 (1.5875) 45.48 (1.791)  
PG42 54.0 (2.126) 16 0.0625 (1.5875) 52.48 (2.066)  
PG48 59.3 (2.335) 16 0.0625 (1.5875) 57.78 (2.275)  

Notes[edit]

References[edit]

  • Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN 0-471-65653-4.