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Technical Data Sheet
PartsTable / MRO / 0518-21
0518-21 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The ADAPTER,SWITCH ACTUATOR is a the manufacturer industrial component. Key specifications include overall_diameter: 6.600 INCHES NOMINAL IN, special_features: OBLONG IN SHAPE, end_item_identification: 7490981(53711) SUBSIS EYEPIECE BOX UNIT 2., part_name_assigned_by_controlling_agency: CAM, SWITCH. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-176-7915, 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
MRO→ MRO_GENERAL→ 0518-21
NSN: 5331-01-176-7915
FSC: 5331 — O-RING
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
overall_diameter6.600 INCHES NOMINAL IN
special_featuresOBLONG IN SHAPE
end_item_identification7490981(53711) SUBSIS EYEPIECE BOX UNIT 2.
part_name_assigned_by_controlling_agencyCAM, SWITCH
NSN5331-01-176-7915
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 0518-21 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
82-0-112Interchangeable
interchangeable cross-reference
interchangeable
1345-K105Interchangeable
interchangeable cross-reference
interchangeable
6421-00Interchangeable
interchangeable cross-reference
interchangeable
82-0-120Interchangeable
interchangeable cross-reference
interchangeable
1375-M420Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-2156Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 0518-21?
0518-21 is a ADAPTER,SWITCH ACTUATOR. It is classified as a MRO (MRO_GENERAL).
What parts can replace 0518-21?
There are 14 known substitutes for 0518-21: 82-0-112, 1345-K105, 6421-00 and 11 more. Substitute compatibility should be verified for your specific system.
Is 0518-21 still available?
0518-21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026