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2121947 — RETAINER,PACKING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

2121947: RETAINER,PACKING.

The RETAINER,PACKING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1020 OVERALL, special_features: A SECOND BOLT HOLE IS LOCATED ON BOLT CIRCLE 4.250 INCHES DIAMETER WITH A DIAMETER OF 0.281 INCHES THRU 0 IN, attachment_method: ROUND HOLE, surface_treatment: PHOSPHATE MANGANESE OVERALL, peripheral_diameter: 4.875 INCHES NOMINAL IN, center_hole_diameter: 2.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-317-5232, 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
2121947
NSN: 5330-01-317-5232
FSC: 5330 — Packing and Gasket Materials
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)
SPECIFICATIONS
materialSTEEL COMP 1020 OVERALL
special_featuresA SECOND BOLT HOLE IS LOCATED ON BOLT CIRCLE 4.250 INCHES DIAMETER WITH A DIAMETER OF 0.281 INCHES THRU 0 IN
attachment_methodROUND HOLE
surface_treatmentPHOSPHATE MANGANESE OVERALL
peripheral_diameter4.875 INCHES NOMINAL IN
center_hole_diameter2.375 INCHES NOMINAL IN
cross-sectional_height1.312 INCHES NOMINAL IN
attachment_hole_diameter0.344 INCHES NOMINAL IN
attachment_feature_quantity6
attachment_feature_circle_diameter4.250 INCHES NOMINAL SINGLE CIRCLE IN
material_document_and_classificationASTM A108 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A575 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A576 ASSN STD 3RD MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationDOD-P-16232 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5330-01-317-5232
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 2121947 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
•
ATTACHMENT HOLE DIAMETER: 0.344 INCHES NOMINAL IN
•
ATTACHMENT FEATURE QUANTITY: 6
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: DOD-P-16232 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CROSS-SECTIONAL HEIGHT: 1.312 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A108 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A575 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A576 ASSN STD 3RD MATERIAL RESPONSE OVERALL
•
ATTACHMENT FEATURE CIRCLE DIAMETER: 4.250 INCHES NOMINAL SINGLE CIRCLE IN
•
PERIPHERAL DIAMETER: 4.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
ATTACHMENT HOLE DIAMETER0.344 INCHES NOMINAL IN
ATTACHMENT FEATURE QUANTITY6
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONDOD-P-16232 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CROSS-SECTIONAL HEIGHT1.312 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A108 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A575 ASSN STD 2ND MATERIAL RESPONSE OR ASTM A576 ASSN STD 3RD MATERIAL RESPONSE OVERALL
ATTACHMENT FEATURE CIRCLE DIAMETER4.250 INCHES NOMINAL SINGLE CIRCLE IN
PERIPHERAL DIAMETER4.875 INCHES NOMINAL IN
SPECIAL FEATURESA SECOND BOLT HOLE IS LOCATED ON BOLT CIRCLE 4.250 INCHES DIAMETER WITH A DIAMETER OF 0.281 INCHES THRU 0 IN
SURFACE TREATMENTPHOSPHATE MANGANESE OVERALL
CENTER HOLE DIAMETER2.375 INCHES NOMINAL IN
OTHER ITEMS IN FSC 5330 — Packing and Gasket Materials
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5330-00-000-0085 5330-00-000-0167 5330-00-000-5275 5330-00-001-1260 5330-00-001-1833 5330-00-001-1844 5330-00-001-1845 5330-00-001-1846
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 2121947?
2121947 is a RETAINER,PACKING.
What is the NSN for 2121947?
2121947 is cataloged in the U.S. Government catalog under NSN 5330-01-317-5232. 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.