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AS21937 ✓ 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 INJECTOR ASSEMBLY,FUEL is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 7075, thread_size: 7/16IN-20 IN, thread_class: 3B, thread_length: 0.250 INCHES NOMINAL IN, overall_length: 0.406 INCHES NOMINAL IN, style_designator: HEXAGON, INTERNAL THREAD, SHOULDERED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-433-2974, 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
AS21937
NSN: 4730-00-433-2974
FSC: 4730
CAGE: 0U583 — SAE INTERNATIONAL DBA SAE INTERNATIONAL (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075
thread_size7/16IN-20 IN
thread_class3B
thread_length0.250 INCHES NOMINAL IN
overall_length0.406 INCHES NOMINAL IN
style_designatorHEXAGON, INTERNAL THREAD, SHOULDERED
thread_directionRIGHT-HAND
length_to_shoulder0.344 INCHES NOMINAL IN
width_across_flats1.000 INCHES NOMINAL IN
screw_thread_locationINTERNAL
casehardening_indicatorNOT CASEHARDENED
largest_inside_diameter0.562 INCHES NOMINAL IN
NSN4730-00-433-2974
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AS21937 · 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
•
UNTHREADED PORTION LENGTH: 0.156 INCHES NOMINAL IN
•
STYLE DESIGNATOR: HEXAGON, INTERNAL THREAD, SHOULDERED
•
SMALLEST INSIDE DIAMETER: 0.500 INCHES NOMINAL IN
•
LENGTH TO SHOULDER: 0.344 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 1.000 INCHES NOMINAL IN
•
MAJOR UNTHREADED OUTSIDE DIAMETER: 1.000 INCHES NOMINAL IN
•
SCREW THREAD LOCATION: INTERNAL
•
MATERIAL: ALUMINUM ALLOY 2024
TECHNICAL CHARACTERISTICS (FLIS)
UNTHREADED PORTION LENGTH0.156 INCHES NOMINAL IN
STYLE DESIGNATORHEXAGON, INTERNAL THREAD, SHOULDERED
SMALLEST INSIDE DIAMETER0.500 INCHES NOMINAL IN
LENGTH TO SHOULDER0.344 INCHES NOMINAL IN
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
MAJOR UNTHREADED OUTSIDE DIAMETER1.000 INCHES NOMINAL IN
SCREW THREAD LOCATIONINTERNAL
MATERIALALUMINUM ALLOY 2024
THREAD SIZE1/2IN-20 IN
CASEHARDENING INDICATORNOT CASEHARDENED
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
AS18280Interchangeable
interchangeable cross-reference
interchangeable
105-01488Interchangeable
interchangeable cross-reference
interchangeable
MS21937W8HInterchangeable
interchangeable cross-reference
interchangeable
MS21937-4HInterchangeable
interchangeable cross-reference
interchangeable
MS21937-4HCInterchangeable
interchangeable cross-reference
interchangeable
MS21937-4LInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AS21937?
AS21937 is a INJECTOR ASSEMBLY,FUEL.
What parts can replace AS21937?
There are 10 known substitutes for AS21937: AS18280, 105-01488, MS21937W8H and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AS21937?
AS21937 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-433-2974. 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