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TC403 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

TC403: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: STEEL, design_type: THREADED, thread_class: 2B, overall_diameter: 0.945 INCHES NOMINAL IN, surface_treatment: CADMIUM, round_cap_outside_surface_condition: SERRATED. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-804-1208, 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
TC403
NSN: 5340-00-804-1208
FSC: 5340 — Hardware, Commercial
CAGE: 66289 — WISCONSIN MOTORS, LLC (USA)
SPECIFICATIONS
materialSTEEL
design_typeTHREADED
thread_class2B
overall_diameter0.945 INCHES NOMINAL IN
surface_treatmentCADMIUM
round_cap_outside_surface_conditionSERRATED
thread_size_and_series/type_designator0.875-18 UNS
NSN5340-00-804-1208
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: TC403 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
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 0.945 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM
•
THREAD CLASS: 2B
•
MATERIAL: STEEL
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.875-18 UNS
•
ROUND CAP OUTSIDE SURFACE CONDITION: SERRATED
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER0.945 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM
THREAD CLASS2B
MATERIALSTEEL
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.875-18 UNS
ROUND CAP OUTSIDE SURFACE CONDITIONSERRATED
SUBSTITUTES & CROSS-REFERENCES 1
56218Same 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 TC403?
TC403 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What parts can replace TC403?
There is 1 known substitute for TC403: 56218. Substitute compatibility should be verified for your specific system.
What is the NSN for TC403?
TC403 is cataloged in the U.S. Government catalog under NSN 5340-00-804-1208. 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.