Hydraulic Pipe Fittings (NPTF)

This connection is still widely used in fluid power systems, even though it is not recommended by the National Fluid Power Association (NFPA) for use in hydraulic applications. The thread is tapered and the seal takes place by deformation of the threads. Measure thread diameter and subtract 1/4- inch to find nominal pipe size.

Inch Size	Dash Size	Nominal Thread Size	Male Thread OD	Female Thread ID
1/8	-02	1/8-27	13/32" (.41)	3/8" (.38)
1/4	-04	1/4-18	17/32" (.54)	1/2" (.49)
3/8	-06	3/8-18	11/16" (.68)	5/8" (.63)
1/2	-08	1/2-14	27/32" (.84)	25/32" (.77)
3/4	-12	3/4-14	1 1/16" (1.05)	1" (.98)
1	-16	1-11.5	1 5/16" (1.32)	1 1/4" (1.24)
1 1/4	-20	1 1/4-11.5	1 21/32" (1.66)	1 19/32" (1.58)
1 1/2	-24	1 1/2-11.5	1 29/32" (1.90)	1 13/16" (1.82)
2	-32	2-11.5	2 3/8" (2.38)	2 5/16" (2.30)

We are an authorized distributor of Eaton Aeroquip products. Other manufacture's part numbers shown for reference.

Hydraulic Pipe Fittings are available in our On-Line Store

Common Steel Hydraulic Pipe Fittings
Image	Description	Part # / SKU
	Steel Pipe Nipple External Pipe / External Pipe	Aeroquip # 2083-x-xS Parker # x-x-FF-S
	Steel Pipe Bushings External Pipe / Internal Pipe	Aeroquip # 2081-x-xS Parker # x-x-PTR-S
	Steel Pipe Plug External Pipe	Aeroquip # 2082-xS Parker # x-HP-S
	Steel Pipe Plug (Countersunk Hex) External Pipe	Aeroquip # 2222-xS Parker # x-HHP-S
	Steel Pipe Extender / Expander External Pipe / Internal Pipe	Aeroquip # 2040-x-xS Parker # x-x-FG-S
	Steel Male Pipe Swivel Adapter Internal Pipe Swivel (NPSM) / External Pipe	Aeroquip # 2045-x-xS Parker # 0107-x-xS
	Steel Female Pipe Swivel Adapter Internal Pipe Swivel (NPSM) / Internal Pipe	Aeroquip # 2046-x-xS Parker # 0207-x-xS
	Steel Pipe Coupler Internal Pipe / Internal Pipe	Aeroquip # 2096-x-xS Parker # x-x-GG-S
	Steel 45° Male Elbow	Aeroquip # 2247-x-xS Parker #
	Steel 45° Female Swivel Elbow Internal Pipe Swivel (NPSM) / Internal Pipe	Aeroquip # 2050-x-xS Parker # 3207-x-xS
	Steel 45° Swivel Elbow Internal Pipe Swivel (NPSM) / External Pipe	Aeroquip # 2049-x-xS Parker # 3107-x-xS
	Steel 45° Street Elbow External Pipe / Internal Pipe	Aeroquip # 2088-x-xS Parker # x-x-CD45-S
	Steel 90° Male Elbow External Pipe / External Pipe	Aeroquip # 2085-x-xS Parker # x-x-CR-S
	Steel 90° Male Swivel Elbow External Pipe Swivel / External Pipe	Aeroquip # 2251-x-xS Parker #
	Steel 90° Street Elbow External Pipe / Internal Pipe	Aeroquip # 2089-x-xS Parker # x-x-CD-S
	Steel 90° Female Swivel Elbow External Pipe Swivel / Internal Pipe	Aeroquip # 2252-x-xS Parker #
	Steel 90° Swivel Elbow Internal Pipe Swivel (NPSM) / External Pipe	Aeroquip # 2047-x-xS Parker # 2107-x-xS
	Steel 90° Female Elbow	Aeroquip # 2087-x-xS Parker # x-DD-S
	Steel Male Pipe Tee External Pipe / External Pipe	Aeroquip # 2257-x-xS Parker # x-RRS-S
	Steel Male Branch Tee External Pipe / Internal Pipe	Aeroquip # 2256-x-xS Parker #
	Steel Male Run Tee External Pipe / Internal Pipe	Aeroquip # 2093-x-xS Parker #
	Steel Run Tee External Pipe / Internal Pipe	Aeroquip # 2092-x-xS Parker # x-MRO-S
	Steel Swivel Branch Tee Internal Pipe Swivel (NPSM) / External Pipe	Aeroquip # 2254-x-xS Parker # 217T-x-xS
	Steel Female Pipe Swivel Tee Internal Pipe Swivel (NPSM)	Aeroquip # 2255-x-xS Parker # 077T-x-xS
	Steel Female Pipe Swivel Branch Tee Internal Pipe Swivel (NPSM) / Internal Pipe	Aeroquip # 2253-x-xS Parker # 227T-x-xS
	Steel Branch Tee External Pipe / Internal Pipe	Aeroquip # 2091-x-xS Parker # x-MMS-S
	Steel Female Pipe Tee Internal Pipe / Internal Pipe	Aeroquip # 2090-x-xS Parker # x-MMO-S
	Steel Pipe Cross Internal Pipe / Internal Pipe	Aeroquip # 2080-x-xS Parker # x-KMMOO-S