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AP50C-4 — Technical Data Sheet

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— · 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

SEAL,CONICAL,FLARED TUBE FITTING. Key specifications include material: COPPER OVERALL, end_item_identification: HYBRID OTPS NO.3, part_name_assigned_by_controlling_agency: COPPER WASHER. This part is cataloged in the Federal Logistics Information System under NSN 4730-00-998-7372, 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
AP50C-4
NSN: 4730-00-998-7372
FSC: 4730
CAGE: 01673 — SPS TECHNOLOGIES, LLC DBA AIRDROME PRECISION COMPONENTS (USA)
SPECIFICATIONS
materialCOPPER OVERALL
end_item_identificationHYBRID OTPS NO.3
part_name_assigned_by_controlling_agencyCOPPER WASHER
NSN4730-00-998-7372
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AP50C-4 · 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
•
BODY LENGTH: 0.075 INCHES NOMINAL IN
•
MATERIAL: COPPER
•
WALL THICKNESS: 0.019 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SEAL
•
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 0.383 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
END ITEM IDENTIFICATIONSTRATIC WEAPON SYSTEM (UGM-13); AIRCRAFT, F-16, ORION P-3; MISSILEAIR INTERCEPT, SIDEWINDER (AIM-9); DRY DECK SHELTER; POSEIDON SUB; TARAWA CLASS LHA
BODY LENGTH0.075 INCHES NOMINAL IN
MATERIALCOPPER
WALL THICKNESS0.019 INCHES NOMINAL IN
OVERALL LENGTH0.155 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
STYLE DESIGNATORSEAL
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
OUTSIDE DIAMETER0.383 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
METALLIC HARDNESS RATING65.0 MAXIMUM ROCKWELL F
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
DY90-C-4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
VSF1015C4SPInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
SEC07C4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
VSF1015C4BXInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
10158973-1InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
DY90InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLEDGOVERNMENT REGISTRY
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AP50C-4?
AP50C-4 is a SEAL,CONICAL,FLARED TUBE FITTING.
What parts can replace AP50C-4?
There are 12 known substitutes for AP50C-4: DY90-C-4, VSF1015C4SP, SEC07C4 and 9 more. Substitute compatibility should be verified for your specific system.
Is AP50C-4 still available?
AP50C-4 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: September 2026