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AP21-473 — RUBBER ROUND SECTION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AP21-473: RUBBER ROUND SECTION.

The RUBBER ROUND SECTION is a the manufacturer industrial component. Key specifications include length: 126.000 INCHES NOMINAL IN, material: RUBBER SILICONE CLASS Q LOCATION NOT OTHERWISE SPECIFIED, surface_condition: SMOOTH BOTH SIDES, cross-sectional_shape_style: CIRCULAR, cross_section_outside_diameter: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-204-5973, 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
AP21-473
NSN: 5330-01-204-5973
FSC: 5330 — Packing and Gasket Materials
CAGE: 11214 — HARDIGG INDUSTRIES, LLC DIV HARDIGG CASES (USA)
SPECIFICATIONS
length126.000 INCHES NOMINAL IN
materialRUBBER SILICONE CLASS Q LOCATION NOT OTHERWISE SPECIFIED
surface_conditionSMOOTH BOTH SIDES
cross-sectional_shape_styleCIRCULAR
cross_section_outside_diameter0.375 INCHES NOMINAL IN
NSN5330-01-204-5973
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AP21-473 MFR: OEM ⚠ VERIFY BEFORE ORDERING Wrong material = failure. Viton for oil/fuel, EPDM for water/steam, Buna-N for general purpose, Silicone for food-grade. Chemical incompatibility causes swelling, brittleness, or rapid degradation ✓ BROKER TIP Durometer (hardness) affects sealing pressure tolerance. Higher Shore A = harder = higher pressure. Standard durometer is 70A — verify if application requires different hardness PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
LENGTH: 126.000 INCHES NOMINAL IN
•
SURFACE CONDITION: SMOOTH BOTH SIDES
•
CROSS-SECTIONAL SHAPE STYLE: CIRCULAR
•
CROSS SECTION OUTSIDE DIAMETER: 0.375 INCHES NOMINAL IN
•
MATERIAL: RUBBER SILICONE CLASS Q LOCATION NOT OTHERWISE SPECIFIED
TECHNICAL CHARACTERISTICS
LENGTH126.000 INCHES NOMINAL IN
SURFACE CONDITIONSMOOTH BOTH SIDES
CROSS-SECTIONAL SHAPE STYLECIRCULAR
CROSS SECTION OUTSIDE DIAMETER0.375 INCHES NOMINAL IN
MATERIALRUBBER SILICONE CLASS Q LOCATION NOT OTHERWISE SPECIFIED
SUBSTITUTES & CROSS-REFERENCES 1
12520508Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AP21-473?
AP21-473 is a RUBBER ROUND SECTION.
What parts can replace AP21-473?
There is 1 known substitute for AP21-473: 12520508. Substitute compatibility should be verified for your specific system.
What is the NSN for AP21-473?
AP21-473 is cataloged in the U.S. Government catalog under NSN 5330-01-204-5973. 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.