Page 501 - 4300 Catalog Cover.pdf

4300 Catalog

Appendix

V15

Parker Hannifin Corporation

Tube Fittings Division

Columbus, Ohio

http://www.parker.com/tfd

Thread Designations and Standards for

Threads Used in Fluid Connectors

Abbreviation

Description

Applicable Std.

Straight Pipe

NPSC

American Standard Straight Pipe Threads in Pipe Couplings

ANSI B1.20.1

Couplings

FED-STD-H28/7

NPSF

Dryseal American Standard Fuel Internal Straight Pipe Threads (generally

SAEJ476

used in soft or ductile materials to mate with NPTF external taper threads)

ANSI B1.20.3

FED-STD-H28/8

NPSI

Dryseal American Intermediate Internal Straight Pipe Threads (for brittle or

SAE J476

hard materials; intended to mate with PTF-SAE short external taper threads)

ANSI B1.20.3

FED-STD-H28/8

NPSM

American Standard Straight Pipe Threads for Free-Fitting Mechanical Joints

ANSI B1.20.1

for Fixtures (these threads fit freely over NPTF threads. They are used in

FED-STD-H28/7

swivel nuts of 07 adapters)

Taper Pipe

ANPT

Aeronautical National Taper Pipe Threads (similar to NPT with various

MIL-P-7105

additional requirements in gaging)

NPT

American Standard Taper Pipe Threads for General Use

ANSI B1.20.1

FED-STD-H28/7

NPTF

Dryseal American Standard Taper Pipe Threads (used in all of our steel and

SAE J476

brass fittings)

ANSI B1.20.3

FED-STD-H28/8

PTF —

Dryseal SAE Short Taper Pipe Threads (mainly used in low pressure pneumatic

SAE J476

SAE Short

and fuel applications)

ANSI B1.20.3

FED-STD-H28/8

PTF —

Dryseal Special Short Taper Pipe Threads

ANSI B1.20.3

SPL Short

1)

PTF —

Dryseal Special Extra Short Taper Pipe Threads

ANSI B1.20.3

SPL Extra Short

1)

Unified Threads

UN

Unified Constant Pitch Threads (standard series: 4, 6, 8, 12, 16, 20, 28, 32)

ANSI B1.1

FED-STD-H28/2

UNC

Unified Coarse Threads

ANSI B1.1

FED-STD-H28/2

UNEF

Unifed Extra Fine Threads

ANSI B1.1

FED-STD-H28/2

UNF

Unified Fine Threads

ANSI B1.1

FED-STD-H28/2

UNS

Unified Special Pitch Threads

ANSI B1.1

FED-STD-H28/3

UNJ

Unified Controlled Root Radius Threads

ANSI B1.15

FED-STD-H28/4

Table V20 —Thread Designations and Standards for Threads Used in Fluid Connectors (continued on the next page)

1) Used in some pneumatic components where shortened thread depth is required because of lack of enough material

due to component size limitations.

Reference Material