ANSI, ISO Thread Designations and References Table Chart

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ANSI, ISO Thread Designations and References

The following chart contains ISO, ANSI, MIL, BS, DIN, JIS standard designations and references for threads.

ISO or ANSI Designation
Description

Ref.
ANSI, BS, ISO

UN Unified Inch Screw Thread, Constant-Pitch Series
B1.1
UNC Unified Inch Screw Thread, Coarse-Pitch Series
B1.1
UNF Unified Inch Screw Thread, Fine-Pitch Series
B1.1
UNEF Unified Inch Screw Thread, Extra-Fine Series
B1.1
UNS Unified Inch Screw Thread, Special Diameter Pitch, or Length of Engagement
B1.1
UNJ Unified Inch Screw Thread, Constant-Pitch Series with Rounded Root of Radius 0.15011P to 0.18042P
B1.15
UNJF Unified Inch Screw Thread, Coarse-Pitch Series, with Rounded Root of Radius 0.15011P to 0.18042P
B1.15
UNJEF Unified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius 0.15011P to 0.18042P
B1.15
UNRE Unified Inch Screw Thread, Extra-Fine Pitch Series, with Rounded Root of Radius 0.15011P to 0.18042P
B1.15
UNR Unified Inch Screw Thread, Constant-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P
B1.1
UNRC Unified Inch Screw Thread, Coarse-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P
B1.1
UNRF Unified Inch Screw Thread, Fine-Pitch Series, with Rounded Root of Radius Not Less Than 0.108P
B1.1
UNREF Unified Inch Screw Thread, Extra-Fine Pitch Series, with Rounded Root of Radius Not Less Than 0.108P
B1.1
NC5 Class 5 Interference Fit External Threads
B1.12
NC5HF For Driving in Hard Ferrous Material of Hardness over 160 Bhn
B1.12
NC5CSF For Driving Copper Alloy and Soft Ferrous Material of 160 Bhn or Less
B1.12
NC5ONF For Driving in Other NonFerrous Material (Nonferrous Materials Other Than Copper Alloys, Any Hardness
B1.12
NC5 Class 5 Interference Fit Internal Threads
B1.12
NC5 IF Entire Ferrous Material Range
B1.12
NCF INF Entire Nonferrous Material Range
B1.12
M Metric Screw Threads-M Profile with Basic ISO 68 Profile
B1.13M B1.18M
MJ Metric Screw Threads-MJ Profile with Rounded Root of Radius 0.15011P to 0.18042P
B1.21M
MJS Metric Screw Threads-MJ Profile Special Series
B1.21M
UNM Unified Miniature Thread Series
B1.10
NPT American Standard Taper Pipe Threads for General Use
B1.20.3
NPTF Dryseal American Standard Taper Pipe Threads
B1.20.3B
F-PTF Dryseal Fine Taper Threads Series
B1.20.3
PTF SAE Dryseal SAE Short Taper Pipe Threads
B1.20.3
PTF SPL Dryseal Special Short Taper Pipe Threads
B1.20.3
SPL PTF Dryseal Special Short Taper Pipe Threads
B1.20.3
ANPT Dryseal Special Taper Pipe Threads
B1.20.3
NPSL Aeronautical National Form Taper Pipe Threads
MIL P-7105B
NPSM American Standard Straight Pipe Threads for Free-Fitting Mechanical Joints for Fixtures
B1.20.1
NPSC American Standard Straight Pipe Threads in Pipe Couplings
B1.20.1
NPSF Dryseal American Standard Fuel Internal Straight Pipe Threads
B1.20.3
NPSI Dryseal American Standard Intermediate Internal Straight Pipe Threads
B1.20.3
NH American Standard Hose Coupling Threads of Full Form
B1.20.7
NPSH Dryseal American Standard for Hose Coupling Joints with Straight Internal & External Loose Fitting Thread
B1.20.7
NFPA 1963 Fire Hose Threads
-
NHR American Standard Hose Coupling Threads for Garden Hose Applications
B1.20.7
NGT National Gas Taper Threads (See Also SGT)
CGA V-1
NGO National Gas Outlet Threads
CGA V-1
NGS National Gas Straight Threads
CGA V-1
SGT Special Gage Taper Threads
BS.21
R British Taper Pipe Threads
BS.21
Rc Rp British Taper Pipe Threads
BS.21
G Straight Pipe Threads
BS.2779
BSW British Parallel Screw Threads
BS.84
BSF British Parallel Screw Threads
BS.84
BA British Screw Threads
BS.57
ACME C Acme Threads, Centralizing
B1.5
ACME G Acme Threads, General Purpose
B1.5
STUB ACME Stub Acme Threads
B1.8
BUTT Buttress Threads, Pull Type
B1.9
PUCH BUTT Buttress Threads , Push Type
B1.9
AMO American Standard Microscope Objective Threads
B1.11
AWWA Underground Service Line Valves and Fittings
C800-84
DIN German Specifications
-
JIS Japanese Industrial Standard
-
ISO International Standard Organization
-

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