PartsTable
Technical Data Sheet
Download PDF

AN939J4 — ADAPTER,STRAIGHT,PIPE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

AN939J4: ADAPTER,STRAIGHT,PIPE TO BOSS.

The ADAPTER,STRAIGHT,PIPE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP 304 OVERALL, flow_angle: 90.0 DEGREES, leg_length: 0.738 INCHES MINIMUM AND 0.760 INCHES MAXIMUM ALL ENDS IN, thread_class: 3A ALL ENDS A, connection_type: THREADED INTERNAL BOSS ALL ENDS, connection_style: GASKET SEAL (BOSS) ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-540-6141, 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
AN939J4
NSN: 4730-00-540-6141
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 13899 — HYDRO-FITTING MANUFACTURING CORPORATION (USA)
SPECIFICATIONS
materialSTEEL COMP 304 OVERALL
flow_angle90.0 DEGREES
leg_length0.738 INCHES MINIMUM AND 0.760 INCHES MAXIMUM ALL ENDS IN
thread_class3A ALL ENDS A
connection_typeTHREADED INTERNAL BOSS ALL ENDS
connection_styleGASKET SEAL (BOSS) ALL ENDS
surface_treatmentPASSIVATE OVERALL
nominal_thread_size0.438 INCHES ALL ENDS IN
end_item_identification05A HELICOPTER, CHINOOK, CH-47 A
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data88044-AN939 GOVERNMENT STANDARD AND 81343-AS4875 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-540-6141
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN939J4 · 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
•
FLOW ANGLE: 90.0 DEGREES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
•
CONNECTION STYLE: GASKET SEAL (BOSS) ALL ENDS
•
CONNECTION TYPE: THREADED INTERNAL BOSS ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
LEG LENGTH: 0.738 INCHES MINIMUM AND 0.760 INCHES MAXIMUM ALL ENDS IN
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS
FLOW ANGLE90.0 DEGREES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE INSIDE
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-F-14072,E300,TY2 MIL SPEC SINGLE TREATMENT RESPONSE OUTSIDE
CONNECTION STYLEGASKET SEAL (BOSS) ALL ENDS
CONNECTION TYPETHREADED INTERNAL BOSS ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
LEG LENGTH0.738 INCHES MINIMUM AND 0.760 INCHES MAXIMUM ALL ENDS IN
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
SPECIFICATION/STANDARD DATA88044-AN939 GOVERNMENT STANDARD AND 81343-AS4875 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
SURFACE TREATMENTPASSIVATE OVERALL
SUBSTITUTES & CROSS-REFERENCES 4
121588-1Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
AN939C4Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
AS4875Reference 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
Ready to buy AN939J4?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is AN939J4?
AN939J4 is a ADAPTER,STRAIGHT,PIPE TO BOSS.
What parts can replace AN939J4?
There are 4 known substitutes for AN939J4: 121588-1, AN939C4, AS4875 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN939J4?
AN939J4 is cataloged in the U.S. Government catalog under NSN 4730-00-540-6141. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — AN939J4

✓ 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.