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A21951 — CAP,FILLER OPENING

✓ Government record, cited
— · COMPONENT
PRODUCT OVERVIEW

A21951: CAP,FILLER OPENING.

The CAP,FILLER OPENING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, overall_height: 0.625 INCHES NOMINAL IN, outside_diameter: 3.000 INCHES NOMINAL IN, style_designator: THREADED TYPE-INTERNAL, surface_treatment: CADMIUM OVERALL, accommodation_type: KNURLED END GRIPPING. This part is cataloged in the U.S.

Government catalog under NSN 2590-00-705-7814, 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
A21951
NSN: 2590-00-705-7814
FSC: 2590 — Miscellaneous Vehicular Components
CAGE: 86823 — ROTH TANK CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_height0.625 INCHES NOMINAL IN
outside_diameter3.000 INCHES NOMINAL IN
style_designatorTHREADED TYPE-INTERNAL
surface_treatmentCADMIUM OVERALL
accommodation_typeKNURLED END GRIPPING
retaining_device_typeCHAIN
retaining_device_length7.000 INCHES NOMINAL IN
thread_series_designatorROLLED THSD 2 13/16 DIA 3/8 IN. THD LENGTH IN
system_for_which_designedNONPRESSURIZED
filler_neck_diameter_for_which_designed2.876 INCHES NOMINAL IN
NSN2590-00-705-7814
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available CAP,FILLER OPENING TITLE COMPONENT PN A21951 MFR CAP,FILLER OPENING
KEY FEATURES
•
ACCOMMODATION TYPE: KNURLED END GRIPPING
•
RETAINING DEVICE TYPE: CHAIN
•
STYLE DESIGNATOR: THREADED TYPE-INTERNAL
•
FILLER NECK DIAMETER FOR WHICH DESIGNED: 2.876 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 3.000 INCHES NOMINAL IN
•
SYSTEM FOR WHICH DESIGNED: NONPRESSURIZED
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.625 INCHES NOMINAL IN
ACCOMMODATION TYPEKNURLED END GRIPPING
RETAINING DEVICE TYPECHAIN
STYLE DESIGNATORTHREADED TYPE-INTERNAL
FILLER NECK DIAMETER FOR WHICH DESIGNED2.876 INCHES NOMINAL IN
OUTSIDE DIAMETER3.000 INCHES NOMINAL IN
SYSTEM FOR WHICH DESIGNEDNONPRESSURIZED
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
RETAINING DEVICE LENGTH7.000 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 1
T19-1Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A21951?
A21951 is a CAP,FILLER OPENING.
What parts can replace A21951?
There is 1 known substitute for A21951: T19-1. Substitute compatibility should be verified for your specific system.
What is the NSN for A21951?
A21951 is cataloged in the U.S. Government catalog under NSN 2590-00-705-7814. This indicates validated use in U.S. government and defense supply chains.
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✓ 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.