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Technical Data Sheet
PartsTable / COMPONENT / DY90-C-4
DY90-C-4 ✓ 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

SEAL,CONICAL,FLARED TUBE FITTING. Key specifications include material: COPPER ALLOY, body_length: 0.075 INCHES NOMINAL IN, overall_length: 0.155 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN, wall_thickness: 0.005 INCHES NOMINAL IN, outside_diameter: 0.359 INCHES NOMINAL IN, special_features: NOT LOX CLEANED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-445-3903, 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
DY90-C-4
NSN: 4730-00-445-3903
FSC: 4730
CAGE: 64162 — DEL AEROSPACE INC DBA DEL AEROSPACE INC (USA)
SPECIFICATIONS
materialCOPPER ALLOY
body_length0.075 INCHES NOMINAL IN
overall_length0.155 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN
wall_thickness0.005 INCHES NOMINAL IN
outside_diameter0.359 INCHES NOMINAL IN
special_featuresNOT LOX CLEANED
style_designatorSEAL
seat_angle_in_deg37.0
casehardening_indicatorNOT CASEHARDENED
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
metallic_hardness_rating65.0 MAXIMUM ROCKWELL F
hose/tube_outside_diameter_for_which_designed0.250 INCHES NOMINAL IN
NSN4730-00-445-3903
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: DY90-C-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
•
OUTSIDE DIAMETER: 0.359 INCHES NOMINAL IN
•
BODY LENGTH: 0.073 INCHES NOMINAL IN
•
SEAT ANGLE IN DEG: 37.0
•
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 0.250 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SEAL
•
MATERIAL: COPPER ALLOY
•
WALL THICKNESS: 0.005 INCHES NOMINAL IN
•
CASEHARDENING INDICATOR: NOT CASEHARDENED
TECHNICAL CHARACTERISTICS (FLIS)
OUTSIDE DIAMETER0.359 INCHES NOMINAL IN
BODY LENGTH0.073 INCHES NOMINAL IN
SEAT ANGLE IN DEG37.0
HOSE/TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED0.250 INCHES NOMINAL IN
STYLE DESIGNATORSEAL
MATERIALCOPPER ALLOY
WALL THICKNESS0.005 INCHES NOMINAL IN
CASEHARDENING INDICATORNOT CASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
SEC07C4Interchangeable
interchangeable cross-reference
interchangeable
VSF1015C4BXInterchangeable
interchangeable cross-reference
interchangeable
10158973-1Interchangeable
interchangeable cross-reference
interchangeable
4730009987372Interchangeable
interchangeable cross-reference
interchangeable
8431398-1Interchangeable
interchangeable cross-reference
interchangeable
10231502Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is DY90-C-4?
DY90-C-4 is a SEAL,CONICAL,FLARED TUBE FITTING.
What parts can replace DY90-C-4?
There are 12 known substitutes for DY90-C-4: SEC07C4, VSF1015C4BX, 10158973-1 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for DY90-C-4?
DY90-C-4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-445-3903. 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: July 2026