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4270-9R — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4270-9R: CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. This part is cataloged in the U.S. Government catalog under NSN 5340-01-303-7474, 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
4270-9R
NSN: 5340-01-303-7474
FSC: 5340 — Hardware, Commercial
CAGE: 1MH97 — DESCO INDUSTRIES, INC. DBA DESCO INDUSTRIES INC DIV DESCO (USA)
SPECIFICATIONS
Part Number4270-9R
NSN5340-01-303-7474
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4270-9R 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
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES 4
10125974-106Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
05A263-25Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
4270 M5501/31A-500Reference document
Same NSN cross-reference
Reference document — Secondary reference
6689757-6Reference document
Same NSN cross-reference
Reference document — Vendor item drawing reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4270-9R?
4270-9R is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace 4270-9R?
There are 4 known substitutes for 4270-9R: 10125974-106, 05A263-25, 4270 M5501/31A-500 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4270-9R?
4270-9R is cataloged in the U.S. Government catalog under NSN 5340-01-303-7474. 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.