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NM304-75 — PACKING WITH RETAINER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

NM304-75: PACKING WITH RETAINER.

The PACKING WITH RETAINER is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING, construction: TWO-PIECE, outside_diameter: 0.500 INCHES NOMINAL IN, retainer_thickness: 0.040 INCHES NOMINAL IN, packing_inside_diameter: 0.239 INCHES NOMINAL IN, retainer_inside_diameter: 0.333 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5331-00-584-1038, 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
NM304-75
NSN: 5331-00-584-1038
NIINs: 005841038, 010280831
FSC: 5331 — O-ring
CAGE: 02697 — PARKER-HANNIFIN CORP DIV O-RING DIVISION (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR PACKING
constructionTWO-PIECE
outside_diameter0.500 INCHES NOMINAL IN
retainer_thickness0.040 INCHES NOMINAL IN
packing_inside_diameter0.239 INCHES NOMINAL IN
retainer_inside_diameter0.333 INCHES NOMINAL IN
material_document_and_classificationMIL-P-25732 MIL SPEC SINGLE MATERIAL RESPONSE PACKING
packing_ring_cross-sectional_diameter0.051 INCHES NOMINAL IN
NSN5331-00-584-1038
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: NM304-75 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
SUBSTITUTES & CROSS-REFERENCES 9
MS28775-213Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5908366Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2-213 N304-75Reference document
Same NSN cross-reference
Reference document — Secondary reference
004213EBReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
A6689-213-144Reference document
Same NSN cross-reference
Reference document — Secondary reference
HTE7300N9-213Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Shelf-life managedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is NM304-75?
NM304-75 is a PACKING WITH RETAINER.
What parts can replace NM304-75?
There are 9 known substitutes for NM304-75: MS28775-213, 5908366, 2-213 N304-75 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for NM304-75?
NM304-75 is cataloged in the U.S. Government catalog under NSN 5331-00-584-1038. 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.