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DC-21S — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

DC-21S: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include material: PLASTIC, POLYETHYLENE (PP), design_type: THREADED, thread_class: 3B, overall_diameter: 1.250 INCHES NOMINAL IN, special_features: COLOR BLUE, inside_diameter_length: 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-184-6883, 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
DC-21S
NSN: 5340-01-184-6883
FSC: 5340 — Hardware, Commercial
CAGE: 23540 — NIAGARA PLASTICS L.L.C. (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
design_typeTHREADED
thread_class3B
overall_diameter1.250 INCHES NOMINAL IN
special_featuresCOLOR BLUE
inside_diameter_length0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator1.5781-14 UNS
NSN5340-01-184-6883
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: DC-21S 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: 1.250 INCHES NOMINAL IN
•
THREAD CLASS: 3B
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 1.5781-14 UNS
•
INSIDE DIAMETER LENGTH: 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER1.250 INCHES NOMINAL IN
SPECIAL FEATURESCOLOR BLUE
THREAD CLASS3B
MATERIALPLASTIC, POLYETHYLENE (PP)
THREAD SIZE AND SERIES/TYPE DESIGNATOR1.5781-14 UNS
INSIDE DIAMETER LENGTH0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN
ROUND CAP OUTSIDE SURFACE CONDITIONRIBBED
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: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is DC-21S?
DC-21S is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for DC-21S?
DC-21S is cataloged in the U.S. Government catalog under NSN 5340-01-184-6883. 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.