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55C12 — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

55C12: CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: STEEL CORROSION RESISTING, length_under_shoulder: 0.559 INCHES NOMINAL IN, open_end_inside_diameter: 0.652 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN, closed_end_overall_diameter: 0.710 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-704-6924, 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
55C12
NSN: 5340-00-704-6924
FSC: 5340 — Hardware, Commercial
CAGE: 59364 — HONEYWELL INTERNATIONAL INC. DBA HONEYWELL INTERNATIONAL DIV AEROSPACE - TEMPE (WEST WARNER ROAD) (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING
length_under_shoulder0.559 INCHES NOMINAL IN
open_end_inside_diameter0.652 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
closed_end_overall_diameter0.710 INCHES NOMINAL IN
NSN5340-00-704-6924
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 55C12 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
•
CLOSED END OVERALL DIAMETER: 0.710 INCHES NOMINAL IN
•
LENGTH UNDER SHOULDER: 0.559 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 0.652 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING
TECHNICAL CHARACTERISTICS
CLOSED END OVERALL DIAMETER0.710 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.559 INCHES NOMINAL IN
OPEN END INSIDE DIAMETER0.652 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING
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

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 55C12?
55C12 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What is the NSN for 55C12?
55C12 is cataloged in the U.S. Government catalog under NSN 5340-00-704-6924. 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.