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277 ITEM 4 — SEAL,PLAIN

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

277 ITEM 4: SEAL,PLAIN.

The SEAL,PLAIN is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5330-01-299-7320, 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
277 ITEM 4
NSN: 5330-01-299-7320
FSC: 5330 — Packing and Gasket Materials
CAGE: U3374 — CAT PUMPS (UK) LTD (GBR)
SPECIFICATIONS
Part Number277 ITEM 4
NSN5330-01-299-7320
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 277 ITEM 4 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 2
711033-051Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
43340Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 277 ITEM 4?
277 ITEM 4 is a SEAL,PLAIN.
What parts can replace 277 ITEM 4?
There are 2 known substitutes for 277 ITEM 4: 711033-051, 43340. Substitute compatibility should be verified for your specific system.
What is the NSN for 277 ITEM 4?
277 ITEM 4 is cataloged in the U.S. Government catalog under NSN 5330-01-299-7320. This indicates validated use in U.S. government and defense supply chains.
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