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R978834879 — PACKING,PREFORMED

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

R978834879: PACKING,PREFORMED.

The PACKING,PREFORMED is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL, end_item_identification: 2 1/2 INCH BUTTERFLY VALVE IN, part_name_assigned_by_controlling_agency: SEAL RING. This part is cataloged in the U.S.

Government catalog under NSN 5330-01-551-0818, 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
R978834879
NSN: 5330-01-551-0818
FSC: 5330 — Packing and Gasket Materials
CAGE: 27005 — BOSCH REXROTH CORPORATION DIV INDUSTRIAL HYDRAULICS (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
end_item_identification2 1/2 INCH BUTTERFLY VALVE IN
part_name_assigned_by_controlling_agencySEAL RING
NSN5330-01-551-0818
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: R978834879 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
•
REFERENCE DATA AND LITERATURE: PU-A21-27-00 PAGE 2 OF 2 TABULATION FOR SUCTION ASSEMBLIES
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
TECHNICAL CHARACTERISTICS
REFERENCE DATA AND LITERATUREPU-A21-27-00 PAGE 2 OF 2 TABULATION FOR SUCTION ASSEMBLIES
PART NAME ASSIGNED BY CONTROLLING AGENCYSEAL RING
END ITEM IDENTIFICATION2 1/2 INCH BUTTERFLY VALVE IN
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR OVERALL
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 2
PU-A21-27-00 P/N US834879Reference document
Same NSN cross-reference
Reference document — Secondary reference
US00834879Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 R978834879?
R978834879 is a PACKING,PREFORMED.
What parts can replace R978834879?
There are 2 known substitutes for R978834879: PU-A21-27-00 P/N US834879, US00834879. Substitute compatibility should be verified for your specific system.
What is the NSN for R978834879?
R978834879 is cataloged in the U.S. Government catalog under NSN 5330-01-551-0818. 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.