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H655-1503-F281-2 — ADAPTER,STRAIGHT,HOSE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

H655-1503-F281-2: ADAPTER,STRAIGHT,HOSE TO BOSS.

The ADAPTER,STRAIGHT,HOSE TO BOSS is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY OVERALL, thread_class: 2A SECOND END A, connection_type: THREADED EXTERNAL BOSS SECOND END, connection_style: GRIPPING NIPPLE (NOSE) FIRST END, special_features: NICHOL ALLOY 400, 405 OR K-500, operating_pressure: 2000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-501-8736, 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
H655-1503-F281-2
NSN: 4730-01-501-8736
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL ALLOY OVERALL
thread_class2A SECOND END A
connection_typeTHREADED EXTERNAL BOSS SECOND END
connection_styleGRIPPING NIPPLE (NOSE) FIRST END
special_featuresNICHOL ALLOY 400, 405 OR K-500
operating_pressure2000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
nominal_thread_size3.0625 INCHES SECOND END IN
maximum_operating_temp200.0 FAHRENHEIT SINGLE RESPONSE DEGF
nominal_overall_length6.000 INCHES IN
end_item_identificationSHIP; R.O. UNIT ST
media_for_which_designedHYDRAULIC FLUID SECOND RESPONSE
thread_quantity_per_inch12 SECOND END
NSN4730-01-501-8736
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: H655-1503-F281-2 · 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 STYLE: GRIPPING NIPPLE (NOSE) FIRST END
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 1.835 INCHES FIRST END IN
•
NOMINAL OUTSIDE DIAMETER HOSE ACCOMMODATED: 2.219 INCHES FIRST END IN
•
NOMINAL OVERALL LENGTH: 6.000 INCHES IN
•
CONNECTION TYPE: THREADED EXTERNAL BOSS SECOND END
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-N-281 FED SPEC 1ST MATERIAL RESPONSE AND QQ-H286 FED SPEC 2ND MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
CONNECTION STYLEGRIPPING NIPPLE (NOSE) FIRST END
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED1.835 INCHES FIRST END IN
NOMINAL OUTSIDE DIAMETER HOSE ACCOMMODATED2.219 INCHES FIRST END IN
NOMINAL OVERALL LENGTH6.000 INCHES IN
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
CONNECTION TYPETHREADED EXTERNAL HOSE GRIPPING FIRST END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 FED SPEC 1ST MATERIAL RESPONSE AND QQ-H286 FED SPEC 2ND MATERIAL RESPONSE OVERALL
OPERATING PRESSURE2000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NOMINAL THREAD SIZE3.0625 INCHES SECOND END IN
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 3
211039440RAReference document
Same NSN cross-reference
Reference document — Secondary reference
211039440RSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
531-6985694-F28Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is H655-1503-F281-2?
H655-1503-F281-2 is a ADAPTER,STRAIGHT,HOSE TO BOSS.
What parts can replace H655-1503-F281-2?
There are 3 known substitutes for H655-1503-F281-2: 211039440RA, 211039440R, 531-6985694-F28. Substitute compatibility should be verified for your specific system.
What is the NSN for H655-1503-F281-2?
H655-1503-F281-2 is cataloged in the U.S. Government catalog under NSN 4730-01-501-8736. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.