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AS4859 ✓ 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,PIPE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 316 OVERALL, connection_type: THREADED INTERNAL PIPE ALL ENDS, connection_style: PLAIN (PIPE) ALL ENDS, style_designator: THREADED INTERNAL, surface_treatment: PASSIVATE OVERALL, nominal_thread_size: 0.125 INCHES ALL ENDS IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-221-2131, 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
AS4859
NSN: 4730-00-221-2131
FSC: 4730
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 316 OVERALL
connection_typeTHREADED INTERNAL PIPE ALL ENDS
connection_stylePLAIN (PIPE) ALL ENDS
style_designatorTHREADED INTERNAL
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.125 INCHES ALL ENDS IN
nominal_overall_length0.843 INCHES IN
thread_series_designatorNPT ALL ENDS
specification/standard_data88044-AN910 GOVERNMENT STANDARD AND 81343-AS4842 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
material_document_and_classificationQQ-S-766,CLASS 316,1/4 HARD FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-221-2131
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS4859 · 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
•
MATERIAL: ALUMINUM ALLOY 2014 OVERALL
•
NOMINAL OVERALL LENGTH: 1.937 INCHES IN
•
STYLE DESIGNATOR: THREADED INTERNAL
•
NOMINAL THREAD SIZE: 1.250 INCHES ALL ENDS IN
•
SPECIFICATION/STANDARD DATA: 81343-AS4859 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 81343-AS4842 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALALUMINUM ALLOY 2014 OVERALL
NOMINAL OVERALL LENGTH1.937 INCHES IN
STYLE DESIGNATORTHREADED INTERNAL
NOMINAL THREAD SIZE1.250 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA81343-AS4859 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD AND 81343-AS4842 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
END ITEM IDENTIFICATIONAIRCRAFT FLUID SYSTEMS
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/4 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CONNECTION TYPETHREADED INTERNAL PIPE ALL ENDS
SURFACE TREATMENTANODIZE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
AS4842Interchangeable
interchangeable cross-reference
interchangeable
MIL-F-5509Interchangeable
interchangeable cross-reference
interchangeable
AS4859Interchangeable
interchangeable cross-reference
interchangeable
AN910-6Interchangeable
interchangeable cross-reference
interchangeable
SAE-AS4842Interchangeable
interchangeable cross-reference
interchangeable
8161436Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS4859?
AS4859 is a ADAPTER,STRAIGHT,PIPE TO BOSS.
What parts can replace AS4859?
There are 19 known substitutes for AS4859: AS4842, MIL-F-5509, AS4859 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS4859?
AS4859 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-221-2131. 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