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RA21338 — CAP,PROTECTIVE,DUST AND MOISTURE

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

RA21338: 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: 0.822 INCHES NOMINAL IN, special_features: PORT DIA 0.375 IN. NOM IN, inside_diameter_length: 0.671 INCHES NOMINAL IN.

This part is cataloged in the U.S. Government catalog under NSN 5340-00-577-3259, 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
RA21338
NSN: 5340-00-577-3259
FSC: 5340 — Hardware, Commercial
CAGE: 51663 — HYDRO-AIRE AEROSPACE CORP. DBA LEAR ROMEC DIV LEAR ROMEC (USA)
SPECIFICATIONS
materialPLASTIC, POLYETHYLENE (PP)
design_typeTHREADED
thread_class3B
overall_diameter0.822 INCHES NOMINAL IN
special_featuresPORT DIA 0.375 IN. NOM IN
inside_diameter_length0.671 INCHES NOMINAL IN
round_cap_outside_surface_conditionRIBBED
thread_size_and_series/type_designator0.750-16 UNF
NSN5340-00-577-3259
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: RA21338 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: 0.822 INCHES NOMINAL IN
•
THREAD CLASS: 3B
•
MATERIAL: PLASTIC, POLYETHYLENE (PP)
•
THREAD SIZE AND SERIES/TYPE DESIGNATOR: 0.750-16 UNF
•
INSIDE DIAMETER LENGTH: 0.671 INCHES NOMINAL IN
•
ROUND CAP OUTSIDE SURFACE CONDITION: RIBBED
TECHNICAL CHARACTERISTICS
DESIGN TYPETHREADED
OVERALL DIAMETER0.822 INCHES NOMINAL IN
SPECIAL FEATURESPORT DIA 0.375 IN. NOM IN
THREAD CLASS3B
MATERIALPLASTIC, POLYETHYLENE (PP)
THREAD SIZE AND SERIES/TYPE DESIGNATOR0.750-16 UNF
INSIDE DIAMETER LENGTH0.671 INCHES NOMINAL 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
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is RA21338?
RA21338 is a CAP,PROTECTIVE,DUST AND MOISTURE.
What is the NSN for RA21338?
RA21338 is cataloged in the U.S. Government catalog under NSN 5340-00-577-3259. 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.