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AN921-2 — ADAPTER,STRAIGHT,PIPE TO BOSS

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

AN921-2: ADAPTER,STRAIGHT,PIPE TO BOSS.

The ADAPTER,STRAIGHT,PIPE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, flow_angle: 90.0 DEGREES, leg_length: 0.828 INCHES NOMINAL SECOND END IN, seat_angle: 37.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-279-0118, 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
AN921-2
NSN: 4730-00-279-0118
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL OVERALL
flow_angle90.0 DEGREES
leg_length0.828 INCHES NOMINAL SECOND END IN
seat_angle37.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARED (TUBE) ALL ENDS
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.312 INCHES ALL ENDS IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data81349-MIL-F-5509 GOVERNMENT SPECIFICATION AND 88044-AN833 GOVERNMENT STANDARD
material_document_and_classificationAISI C1137 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 1141 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 4130 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-279-0118
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN921-2 · 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
•
FLOW ANGLE: 90.0 DEGREES
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: FLARED (TUBE) ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
MATERIAL DOCUMENT AND CLASSIFICATION: AISI C1137 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 1141 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 4130 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.125 INCHES ALL ENDS IN
•
LEG LENGTH: 1.406 INCHES NOMINAL FIRST END IN
TECHNICAL CHARACTERISTICS
FLOW ANGLE90.0 DEGREES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEFLARED (TUBE) ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATIONAISI C1137 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 1141 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 4130 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 4140 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.125 INCHES ALL ENDS IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.125 INCHES FIRST END BULKHEAD IN
LEG LENGTH1.406 INCHES NOMINAL FIRST END IN
LEG LENGTH0.828 INCHES NOMINAL SECOND END IN
NOMINAL THREAD SIZE0.312 INCHES ALL ENDS IN
SUBSTITUTES & CROSS-REFERENCES 5
SAE-AS4841Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
SAE AS1038Reference document
Same NSN cross-reference
Reference document — Secondary reference
SAE AS1038-0202Reference document
Same NSN cross-reference
Reference document — Secondary reference
AN833-2Reference 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 AN921-2?
AN921-2 is a ADAPTER,STRAIGHT,PIPE TO BOSS.
What parts can replace AN921-2?
There are 5 known substitutes for AN921-2: SAE-AS4841, SAE AS1038, SAE AS1038-0202 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN921-2?
AN921-2 is cataloged in the U.S. Government catalog under NSN 4730-00-279-0118. This indicates validated use in U.S. government and defense supply chains.
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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.