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PartsTable / COMPONENT / C557D10
C557D10 ✓ 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 ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2014 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.969 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNF, special_features: USED ON GRUMMAN AIRCRAFT,MODEL A10. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-287-0290, 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
C557D10
NSN: 4730-00-287-0290
FSC: 4730
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2014 OVERALL
nut_styleTUBE COUPLING
nut_height0.969 INCHES NOMINAL IN
thread_class3B
thread_seriesUNF
special_featuresUSED ON GRUMMAN AIRCRAFT,MODEL A10
thread_directionRIGHT-HAND
surface_treatmentANODIZE OVERALL
fabrication_methodMACHINED OR FORGED
length_to_shoulder0.817 INCHES NOMINAL IN
width_across_flats0.996 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN
nominal_thread_size0.875 INCHES IN
NSN4730-00-287-0290
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: C557D10 · 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
•
THREAD SERIES: UNF
•
NUT HEIGHT: 0.969 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 14
•
MATERIAL: ALUMINUM ALLOY 2014 OVERALL
•
WIDTH ACROSS FLATS: 0.996 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NUT STYLE: TUBE COUPLING
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNF
NUT HEIGHT0.969 INCHES NOMINAL IN
THREAD QUANTITY PER INCH14
MATERIALALUMINUM ALLOY 2014 OVERALL
WIDTH ACROSS FLATS0.996 INCHES MINIMUM AND 1.003 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/4,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NUT STYLETUBE COUPLING
SPECIAL FEATURESUSED ON GRUMMAN AIRCRAFT,MODEL A10
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.875 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 24
672B482P1Interchangeable
interchangeable cross-reference
interchangeable
10139872Interchangeable
interchangeable cross-reference
interchangeable
273-1034P22Interchangeable
interchangeable cross-reference
interchangeable
8176567Interchangeable
interchangeable cross-reference
interchangeable
AN818-20DInterchangeable
interchangeable cross-reference
interchangeable
SAE-AS4841Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is C557D10?
C557D10 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace C557D10?
There are 24 known substitutes for C557D10: 672B482P1, 10139872, 273-1034P22 and 21 more. Substitute compatibility should be verified for your specific system.
Is C557D10 still available?
C557D10 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: July 2026