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AS21924 ✓ 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,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-12 OVERALL, seat_angle: 12.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END, surface_treatment: CADMIUM OVERALL. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-088-6705, 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
AS21924
NSN: 4730-00-088-6705
FSC: 4730
CAGE: 81343 — SOCIETY OF AUTOMOTIVE ENGINEERS INC (USA)
SPECIFICATIONS
materialSTEEL COMP XM-12 OVERALL
seat_angle12.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) FIRST END
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.500 INCHES ALL ENDS IN
nominal_overall_length1.688 INCHES IN
end_item_identificationA-10 WRP
thread_quantity_per_inch20 ALL ENDS
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
part_name_assigned_by_controlling_agencyUNION, FLARELESS TUBE, BULKHEAD AND UNIVERSAL
NSN4730-00-088-6705
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS21924 · 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
•
THREAD CLASS: 3A CENTER BULKHEAD A
•
NOMINAL THREAD SIZE: 1.625 INCHES CENTER BULKHEAD IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT (UNJ) CENTER BULKHEAD
•
SURFACE TREATMENT: ANODIZE OVERALL
•
NOMINAL OVERALL LENGTH: 2.469 INCHES IN
•
THREAD QUANTITY PER INCH: 12 CENTER BULKHEAD
•
SPECIFICATION/STANDARD DATA: 96906-MS21924 GOVERNMENT STANDARD
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 1.250 INCHES FIRST END IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD CLASS3A CENTER BULKHEAD A
NOMINAL THREAD SIZE1.625 INCHES CENTER BULKHEAD IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT (UNJ) CENTER BULKHEAD
SURFACE TREATMENTANODIZE OVERALL
NOMINAL OVERALL LENGTH2.469 INCHES IN
THREAD QUANTITY PER INCH12 CENTER BULKHEAD
SPECIFICATION/STANDARD DATA96906-MS21924 GOVERNMENT STANDARD
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED1.250 INCHES FIRST END IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6,T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OPERATING PRESSURE1500.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
MS21924W20Interchangeable
Same NIIN cross-reference
interchangeable
SAE-AS18280Interchangeable
Same NIIN cross-reference
interchangeable
MS21924D20Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS21924?
AS21924 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace AS21924?
There are 3 known substitutes for AS21924: MS21924W20, SAE-AS18280, MS21924D20. Substitute compatibility should be verified for your specific system.
What is the NSN for AS21924?
AS21924 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-088-6705. 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