PartsTable
Technical Data Sheet
Download PDF

660-004MT20S5-21 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

660-004MT20S5-21: CAP,PROTECTIVE,DUST AND MOISTURE.

CAP,PROTECTIVE,DUST AND MOISTURE. Key specifications include design_type: THREADED, overall_length: 0.844 INCHES NOMINAL IN, overall_diameter: 1.312 INCHES NOMINAL IN, special_features: SASH CHAIN:STAINLESS STEEL, PASSIVATE, SOLID RING 1.265 INSIDE DIA, part_name_assigned_by_controlling_agency: DUST CAP WITH CHAIN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-660-1496, 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
660-004MT20S5-21
NSN: 5340-01-660-1496
FSC: 5340 — Hardware, Commercial
CAGE: 06324 — GLENAIR, INC. (USA)
SPECIFICATIONS
design_typeTHREADED
overall_length0.844 INCHES NOMINAL IN
overall_diameter1.312 INCHES NOMINAL IN
special_featuresSASH CHAIN:STAINLESS STEEL, PASSIVATE, SOLID RING 1.265 INSIDE DIA
part_name_assigned_by_controlling_agencyDUST CAP WITH CHAIN
NSN5340-01-660-1496
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 660-004MT20S5-21 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
KEY FEATURES
•
DESIGN TYPE: THREADED
•
OVERALL DIAMETER: 1.312 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER1.312 INCHES NOMINAL IN
OVERALL LENGTH0.844 INCHES NOMINAL IN
SPECIAL FEATURESSASH CHAIN:STAINLESS STEEL, PASSIVATE, SOLID RING 1.265 INSIDE DIA
PART NAME ASSIGNED BY CONTROLLING AGENCYDUST CAP WITH CHAIN
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
Ready to buy 660-004MT20S5-21?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 660-004MT20S5-21?
660-004MT20S5-21 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for 660-004MT20S5-21?
660-004MT20S5-21 is cataloged in the U.S. Government catalog under NSN 5340-01-660-1496. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 660-004MT20S5-21

✓ 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.