PartsTable
Technical Data Sheet
503-4556027 ✓ 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,QUICK DISCONNECT is a the manufacturer industrial component. Key specifications include material: STEEL BODY, nut_style: TUBE COUPLING, leg_length: 1.000 INCHES NOMINAL THIRD END IN, nut_height: 0.594 INCHES NOMINAL IN, seat_angle: 45.0 DEGREES ALL ENDS, reducer_type: CONCENTRIC. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-175-1135, 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
503-4556027
NSN: 4730-01-175-1135
FSC: 4730
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialSTEEL BODY
nut_styleTUBE COUPLING
leg_length1.000 INCHES NOMINAL THIRD END IN
nut_height0.594 INCHES NOMINAL IN
seat_angle45.0 DEGREES ALL ENDS
reducer_typeCONCENTRIC
thread_class2A ALL ENDS A
thread_seriesUNF
overall_length2.500 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleFLARED ALL ENDS
special_features3/8 INCH ODF,VARIOUS MATERIAL,END CONNECTION FLARED-FOR NAVY NUCLEAR PROPULSION PLANT PRODUCTS ONLY IN
NSN4730-01-175-1135
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 503-4556027 · 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
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS: AS DIFFERENTIATED BY FREE FROM MERCURY CONTAMINATION
CRITICALITY CODE JUSTIFICATION: ZZZY
TECHNICAL CHARACTERISTICS (FLIS)
REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICSAS DIFFERENTIATED BY FREE FROM MERCURY CONTAMINATION
CRITICALITY CODE JUSTIFICATIONZZZY
SPECIAL FEATURES3/8 INCH ODF,VARIOUS MATERIAL,END CONNECTION FLARED-FOR NAVY NUCLEAR PROPULSION PLANT PRODUCTS ONLY IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
202208-18-16BInterchangeable
interchangeable cross-reference
interchangeable
1889863PC157Interchangeable
interchangeable cross-reference
interchangeable
2670-57 ITEM 13Interchangeable
interchangeable cross-reference
interchangeable
202220-16-16SInterchangeable
interchangeable cross-reference
interchangeable
2670-57 ITEM 84Interchangeable
interchangeable cross-reference
interchangeable
503-4556027Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 503-4556027?
503-4556027 is a COUPLING HALF,QUICK DISCONNECT.
What parts can replace 503-4556027?
There are 24 known substitutes for 503-4556027: 202208-18-16B, 1889863PC157, 2670-57 ITEM 13 and 21 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 503-4556027?
503-4556027 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-175-1135. This indicates validated use in U.S. government and defense supply chains.
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