PartsTable
Technical Data Sheet
2670-57 ITEM 19 ✓ Verified by PartsTable
· HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The COUPLING HALF,SELF-SEALING is a the manufacturer industrial component. Key specifications include material: STEEL BODY, seat_angle: 37.0 DEGREES LOCATION NOT OTHERWISE SPECIFIED, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION, connection_style: FLARED ALL ENDS, special_features: FOR NAVY NUCLEAR PROPULSION PLANT PRODUCTS ONLY. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-175-7082, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
2670-57 ITEM 19
NSN: 4730-01-175-7082
FSC: 4730
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialSTEEL BODY
seat_angle37.0 DEGREES LOCATION NOT OTHERWISE SPECIFIED
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleFLARED ALL ENDS
special_featuresFOR NAVY NUCLEAR PROPULSION PLANT PRODUCTS ONLY
style_designatorMALE COUPLING HALF
features_providedSELF-SEALING
operating_pressure2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size0.438 INCHES ALL ENDS IN
thread_series_designatorUNF ALL ENDS
NSN4730-01-175-7082
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2670-57 ITEM 19 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
OPERATING PRESSURE: 2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
THREAD CLASS: 3A ALL ENDS A
CONNECTION STYLE: FLARED ALL ENDS
FEATURES PROVIDED: SELF-SEALING
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
THREAD SERIES DESIGNATOR: UNF ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
SPECIAL FEATURESFOR NAVY NUCLEAR PROPULSION PLANT PRODUCTS ONLY
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
OPERATING PRESSURE2500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
THREAD CLASS3A ALL ENDS A
CONNECTION STYLEFLARED ALL ENDS
FEATURES PROVIDEDSELF-SEALING
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
THREAD SERIES DESIGNATORUNF ALL ENDS
STYLE DESIGNATORMALE COUPLING HALF
MATERIALSTEEL BODY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
224046Interchangeable
interchangeable cross-reference
interchangeable
5400-S2-4Interchangeable
interchangeable cross-reference
interchangeable
533885-1Interchangeable
interchangeable cross-reference
interchangeable
5409-S17-6-4Interchangeable
interchangeable cross-reference
interchangeable
503-4556027 ITEM 17Interchangeable
interchangeable cross-reference
interchangeable
2670-57ITEM17Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2670-57 ITEM 19?
2670-57 ITEM 19 is a COUPLING HALF,SELF-SEALING.
What parts can replace 2670-57 ITEM 19?
There are 24 known substitutes for 2670-57 ITEM 19: 224046, 5400-S2-4, 533885-1 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2670-57 ITEM 19?
2670-57 ITEM 19 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-175-7082. This indicates validated use in U.S. government and defense supply chains.
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