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AN840-4D — ADAPTER,STRAIGHT,PIPE TO HOSE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

AN840-4D: ADAPTER,STRAIGHT,PIPE TO HOSE.

The ADAPTER,STRAIGHT,PIPE TO HOSE is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2014 AND ALUMINUM ALLOY 2024 OVERALL, connection_type: THREADED EXTERNAL PIPE FIRST END, connection_style: PLAIN (PIPE) FIRST END, surface_treatment: ANODIZE OVERALL, nominal_thread_size: 0.125 INCHES FIRST END IN, nominal_overall_length: 2.078 INCHES IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-187-0861, 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
AN840-4D
NSN: 4730-00-187-0861
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 70188 — FRANKLIN ENGINE CO INC (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2014 AND ALUMINUM ALLOY 2024 OVERALL
connection_typeTHREADED EXTERNAL PIPE FIRST END
connection_stylePLAIN (PIPE) FIRST END
surface_treatmentANODIZE OVERALL
nominal_thread_size0.125 INCHES FIRST END IN
nominal_overall_length2.078 INCHES IN
end_item_identificationAIRCRAFT APPLICATION
media_for_which_designedHYDRAULIC FLUID SINGLE RESPONSE
thread_series_designatorANPT FIRST END
specification/standard_data88044-AN840 GOVERNMENT STANDARD AND 81343-AS4843/2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
material_document_and_classificationQQ-A-367,COMP 2014,T6 FED SPEC SINGLE MATERIAL RESPONSE AND QQ-A-255/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
nominal_inside_diameter_hose_accommodated0.250 INCHES SECOND END IN
NSN4730-00-187-0861
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN840-4D · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: BEADED (HOSE) SECOND END
•
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED: 0.250 INCHES SECOND END IN
•
NOMINAL OVERALL LENGTH: 2.078 INCHES IN
•
CONNECTION TYPE: UNTHREADED EXTERNAL HOSE SECOND END
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-367,COMP 2014,T6 FED SPEC SINGLE MATERIAL RESPONSE AND QQ-A-255/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEBEADED (HOSE) SECOND END
CONNECTION STYLEPLAIN (PIPE) FIRST END
NOMINAL INSIDE DIAMETER HOSE ACCOMMODATED0.250 INCHES SECOND END IN
NOMINAL OVERALL LENGTH2.078 INCHES IN
CONNECTION TYPEUNTHREADED EXTERNAL HOSE SECOND END
CONNECTION TYPETHREADED EXTERNAL PIPE FIRST END
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-367,COMP 2014,T6 FED SPEC SINGLE MATERIAL RESPONSE AND QQ-A-255/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD SIZE0.125 INCHES FIRST END IN
SPECIFICATION/STANDARD DATA88044-AN840 GOVERNMENT STANDARD AND 81343-AS4843/2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SUBSTITUTES & CROSS-REFERENCES 6
4HLFDReference document
Same NSN cross-reference
Reference document — Secondary reference
AS4843/2Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE-AS4843/2Reference document
Same NSN cross-reference
Reference document — Secondary reference
17X23Reference document
Same NSN cross-reference
Reference document — Secondary reference
840-4DReference document
Same NSN cross-reference
Reference document — Secondary reference
MIL-F-5509Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AN840-4D?
AN840-4D is a ADAPTER,STRAIGHT,PIPE TO HOSE.
What parts can replace AN840-4D?
There are 6 known substitutes for AN840-4D: 4HLFD, AS4843/2, SAE-AS4843/2 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN840-4D?
AN840-4D is cataloged in the U.S. Government catalog under NSN 4730-00-187-0861. This indicates validated use in U.S. government and defense supply chains.
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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.