Steel NPT Pipe Thread Fittings


The HFI manufacturing system of hydraulic fittings has in place techniques to maintain consistent, even thread pitches on every fitting. All steel starts from certified bar stock and is cut to perfection. Silver brazing and other brazing techniques are used to form ideal shapes. HFI fabricates elbows, tees, crosses and 45 degree elbows in addition to specials. Our brazed elbows withstand great amounts of high pressure and will njot leak.

Styles AvailableHFI manufactures Air-Way style fittings that comprise of JIC, NPT, ORFS, DIN, Metric, Inverted Flare ond others as well.


National Pipe Thread is a U. S. standard for tapered (NPT) or straight (NPS) threads used to join pipes and fittings. ANSI/ASME standard B1. 20. 1 covers threads of 60-degree form with flat crests and roots in sizes from ¹/16 inch to 24 inch Nominal Pipe Size. The taper rate for all NPT threads is ¹/16 (³/4 inch per foot) measured by the change of diameter (of the pipe thread) over distance. The taper divided by a center line yields an angle 1° 47 24" or 1. 7899° as measured from the center axis. Commonly-used sizes are ¹/8, ¹/4, ³/8, ¹/2, ³/4, 1, 1 ¹/4, 1 ¹/2, and 2 inch, appearing on pipe and fittings by most U. S. suppliers. Smaller sizes than those listed are occasionally used for compressed air. Larger sizes are used less frequently because other methods of joining are more practical at 3 inches and above in most applications. Nominal Pipe Size is loosely related to the inside diameter of schedule 40 pipe. Because of the pipe wall thickness, the actual diameter of the threads is larger than the NPS, considerably so for small NPS. Other schedules of pipe have different wall thickness but the OD (outer diameter) and thread profile remain the same, so the inside diameter of the pipe is therefore different from the nominal diameter. Threaded pipes can provide an effective seal for pipes transporting liquids, gases, steam, and hydraulic fluid. These threads are now used in materials other than steel and brass, including PVC, nylon, bronze and cast iron. The taper on NPT threads allows them to form a seal when torqued as the flanks of the threads compress against each other, as opposed to straight thread fittings or compression fittings in which the threads merely hold the pieces together and do not provide the seal. However a clearance remains between the crests and roots of the threads, resulting in a leakage around this spiral. This mea be made leak free with the aid of thread seal tape or a thread sealant compound. (The use of tape or sealant will also help to limit corrosion on the threads, which can make future disassembly nearly impossible. There is also a semi-compatible variant called NPTF or Dryseal, designed to provide a more leak-free seal without the use of teflon tape or other sealant compound. NPTF threads are the same basic shape but with crest and root heights adjusted for an interference fit, eliminating the spiral leakage path. Sometimes NPT threads are referred to as MPT (Male Pipe Thread), MNPT, or NPT(M) for male (external) threads and FPT (Female Pipe Thread), FNPT, or NPT(F) for female (internal) threads. An equivalent designation is MIP (Male iron pipe) and FIP (Female iron pipe)


We offer pipe thread fittting and elbows in a variety of shapes. NPT elbow fittings, NPT cross fittings, NPT tee fittings, NPT run tee fittings, NPT branch tee fittings, NPT street tee fittings, NPT street elbows.
Wide selection of steel hydraulic adapters, Hydraulic Hose Couplers and Hydraulic Hose Ends.
Call Now! 262-634-5534 Ask for Chris in Sales, he's ready to help.
HFI is an ISO 9001:2008 registered company HFI is an ISO 9001:2008 registered company
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NPTPIPE THREAD

Tapered pipe thread adapters

9435




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9435

NPT Male Swivel Union 90 Elbow

NPT Fittings

Interchanges With:
Air-Way: 5500SW
Aeroquip: 2251
Imperial:
Parker Tube:
Parker Hose:
Weatherhead: 9435
C3059




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C3059

NPT Tru-Seal Nut

NPT Fittings

Interchanges With:
C3069




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C3069

NPT Male Union Straight

NPT Fittings

Interchanges With:
Air-Way: 5404
Aeroquip: 2083
Imperial: 24SA
Parker Tube: FF
Parker Hose: 101
Weatherhead: C3069
C3109




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C3109

NPT Male to NPT Female Reducer

NPT Fittings

Interchanges With:
Air-Way: 5406
Aeroquip: 2081
Imperial: 24SB
Parker Tube: PTR
Parker Hose: 102
Weatherhead: C3109
C3159




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C3159

NPT Male Hex Head Plug

NPT Fittings

Interchanges With:
Air-Way: 5406P
Aeroquip: 2082
Imperial:
Parker Tube: HP
Parker Hose: 01CP
Weatherhead: C3159
C3169




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C3169

NPT Male Socket Head Plug

NPT Fittings

Interchanges With:
Air-Way: 5406H
Aeroquip: 2222
Imperial: 24SR
Parker Tube: HHP
Parker Hose: 01HP
Weatherhead: C3169
C3179




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C3179

NPT Male Square Head Plug

NPT Fittings

Interchanges With:
Air-Way: 5406S
Aeroquip:
Imperial: 25SP
Parker Tube:
Parker Hose:
Weatherhead: C3179
C3209




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C3209

NPT Male to NPT Female Expander

NPT Fittings

Interchanges With:
Air-Way: 5405
Aeroquip: 2040
Imperial:
Parker Tube: FG
Parker Hose: 201
Weatherhead: C3209
C3239




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C3239

NPT Male to SAE Female Boss Straight

NPT Fittings

Interchanges With:
Air-Way: 6404
Aeroquip: 2246
Imperial:
Parker Tube: FHG5
Parker Hose:
Weatherhead: C3239
C3249




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C3249

NPT Male to SAE Male Boss Straight

NPT Fittings

Interchanges With:
Air-Way: 6401
Aeroquip:
Imperial:
Parker Tube:
Parker Hose:
Weatherhead: C3249
C3269




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C3269

NPT Female to SAE Male Boss Straight

NPT Fittings

Interchanges With:
Air-Way: 6405
Aeroquip: 2216
Imperial: 720-FSO
Parker Tube: F50G
Parker Hose: 502
Weatherhead: C3269
C3309




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C3309

NPT Female Union Straight

NPT Fittings

Interchanges With:
Air-Way: 5000
Aeroquip: 2096
Imperial: 24SJ
Parker Tube: GG
Parker Hose: 202
Weatherhead: C3309
C3359




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C3359

NPT Male Union 45 Elbow

NPT Fittings

Interchanges With:
Air-Way: 5503
Aeroquip: 2088
Imperial: 25TG
Parker Tube: CD45
Parker Hose: 3102
Weatherhead: C3359
C3469




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C3469

NPT Female to SAE Male Boss 90 Elbow

NPT Fittings

Interchanges With:
Air-Way: 6805LL
Aeroquip: 206804
Imperial:
Parker Tube: AE4OG
Parker Hose: 5502
Weatherhead: C3469
C3509




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C3509

NPT Female Union 90 Elbow

NPT Fittings

Interchanges With:
Air-Way: 5504
Aeroquip: 2087
Imperial: 25UJ
Parker Tube: DD
Parker Hose: 2202
Weatherhead: C3509
C3529




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C3529

NPT Male Union 90 Elbow

NPT Fittings

Interchanges With:
Air-Way: 5500
Aeroquip: 2085
Imperial: 25UA
Parker Tube: CR
Parker Hose: 2101
Weatherhead: C3529
C3569




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C3569

NPT Male to SAE Male Boss 90 Elbow

NPT Fittings

Interchanges With:
C3609




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C3609

NPT Female - NPT Male Branch Tee

NPT Fittings

Interchanges With:
Air-Way: 5604
Aeroquip: 2091
Imperial: 25VC
Parker Tube: MMS
Parker Hose: 212T
Weatherhead: C3609
C3709




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C3709

NPT Female Union Tee

NPT Fittings

Interchanges With:
Air-Way: 5605
Aeroquip: 2090
Imperial: 25VJ
Parker Tube: MMO
Parker Hose: 022T
Weatherhead: C3709
C3759




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C3759

NPT Female - NPT Male Run Tee

NPT Fittings

Interchanges With:
Air-Way: 5602
Aeroquip: 2092
Imperial: 25VK
Parker Tube: MRO
Parker Hose: 012T
Weatherhead: C3759
C3805




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C3805

NPT Male - NPT Female Run Tee

NPT Fittings

Interchanges With:
Air-Way: 5603
Aeroquip: 2093
Imperial:
Parker Tube:
Parker Hose:
Weatherhead: C3805
C3959




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C3959

NPT Male Union Cross

NPT Fittings

Interchanges With:
Air-Way: 5652
Aeroquip: 2080
Imperial: 25WJ
Parker Tube: KMMOO
Parker Hose: 022X
Weatherhead: C3959

Customer Satisfaction Survey HFI FLUID POWER PRODUCTS
1210 Washington Ave.
Racine, WI. 53403
Phone: (262) 634-5534         Fax: (262) 634-2127
http://www.hfifluidpowerproducts.com
sales@hfifluidpowerproducts.com

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