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2670-57 ITEM 20 — Technical Data Sheet

✓ 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: 45.0 DEGREES ALL ENDS, thread_class: 2A ALL ENDS A, overall_length: 2.500 INCHES NOMINAL IN, connection_type: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION, connection_style: FLARED ALL ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System under NSN 4730-01-177-3518, 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 20
NSN: 4730-01-177-3518
FSC: 4730
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialSTEEL BODY
seat_angle45.0 DEGREES ALL ENDS
thread_class2A ALL ENDS A
overall_length2.500 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleFLARED ALL ENDS
style_designatorMALE COUPLING HALF
surface_treatmentZINC BODY
nominal_thread_size0.625 INCHES ALL ENDS IN
thread_series_designatorUNF ALL ENDS
NSN4730-01-177-3518
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2670-57 ITEM 20 · 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
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
•
THREAD CLASS: 2A ALL ENDS A
•
MATERIAL: STEEL BODY
•
CONNECTION STYLE: FLARED ALL ENDS
•
SURFACE TREATMENT: ZINC BODY
•
STYLE DESIGNATOR: MALE COUPLING HALF
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
SEAT ANGLE: 45.0 DEGREES ALL ENDS
TECHNICAL CHARACTERISTICS
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
THREAD CLASS2A ALL ENDS A
MATERIALSTEEL BODY
CONNECTION STYLEFLARED ALL ENDS
SURFACE TREATMENTZINC BODY
STYLE DESIGNATORMALE COUPLING HALF
THREAD SERIES DESIGNATORUNF ALL ENDS
SEAT ANGLE45.0 DEGREES ALL ENDS
NOMINAL THREAD SIZE0.625 INCHES ALL ENDS IN
OVERALL LENGTH2.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
5409-S17-6-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
503-4556027 ITEM 17InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
2670-57ITEM17InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
202208-18-16BInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
1889863PC157InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
2670-57 ITEM 13InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2670-57 ITEM 20?
2670-57 ITEM 20 is a COUPLING HALF,SELF-SEALING.
What parts can replace 2670-57 ITEM 20?
There are 24 known substitutes for 2670-57 ITEM 20: 5409-S17-6-4, 503-4556027 ITEM 17, 2670-57ITEM17 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2670-57 ITEM 20?
2670-57 ITEM 20 is cataloged in the Federal Logistics Information System under NSN 4730-01-177-3518. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026