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RT21512 — CAP-PLUG,PROTECTIVE,DUST AND MOI

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

RT21512: CAP-PLUG,PROTECTIVE,DUST AND MOI.

CAP-PLUG,PROTECTIVE,DUST AND MOI. Key specifications include material: STEEL, special_features: FURNISHED W/BEND CHAIN, length_under_shoulder: 0.395 INCHES NOMINAL IN, open_end_inside_diameter: 1.555 INCHES NOMINAL IN, closed_end_overall_diameter: 1.638 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-006-4593, 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
RT21512
NSN: 5340-01-006-4593
FSC: 5340 — Hardware, Commercial
CAGE: F0302 — SAFRAN TRANSMISSION SYSTEMS (FRA)
SPECIFICATIONS
materialSTEEL
special_featuresFURNISHED W/BEND CHAIN
length_under_shoulder0.395 INCHES NOMINAL IN
open_end_inside_diameter1.555 INCHES NOMINAL IN
closed_end_overall_diameter1.638 INCHES NOMINAL IN
NSN5340-01-006-4593
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: RT21512 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
•
CLOSED END OVERALL DIAMETER: 1.638 INCHES NOMINAL IN
•
LENGTH UNDER SHOULDER: 0.395 INCHES NOMINAL IN
•
OPEN END INSIDE DIAMETER: 1.555 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
CLOSED END OVERALL DIAMETER1.638 INCHES NOMINAL IN
LENGTH UNDER SHOULDER0.395 INCHES NOMINAL IN
SPECIAL FEATURESFURNISHED W/BEND CHAIN
OPEN END INSIDE DIAMETER1.555 INCHES NOMINAL IN
MATERIALSTEEL
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 1
SDC-4-HKReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 RT21512?
RT21512 is a CAP-PLUG,PROTECTIVE,DUST AND MOI.
What parts can replace RT21512?
There is 1 known substitute for RT21512: SDC-4-HK. Substitute compatibility should be verified for your specific system.
What is the NSN for RT21512?
RT21512 is cataloged in the U.S. Government catalog under NSN 5340-01-006-4593. 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.