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Technical Data Sheet
PartsTable / MRO / 21-218
21-218 ✓ Verified by PartsTable
Legrand · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The COIL,RADIO FREQUENCY is a Legrand industrial component. Key specifications include width: 4.594 INCHES NOMINAL IN, material: STEEL COMP 416, end_style: SPRING END,SQUARED AND GROUND BOTH ENDS, body_style: PANEL MOUNTPANEL MOUNT, body_width: 0.859 INCHES MINIMUM AND 0.859 INCHES MINIMUM AND 0.900 INCHES MAXIMUM0.900 INCHES MAXIMUM IN, bore_shape: STRAIGHT BOTH ENDS. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-297-9889, 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
MRO→ MRO_GENERAL→ 21-218
NSN: 5330-00-297-9889
FSC: 5330
CAGE: 80201 — SKF USA INC. DBA SKF AEROSPACE SEALING SOLUTIONS (USA)
SPECIFICATIONS
width4.594 INCHES NOMINAL IN
materialSTEEL COMP 416
end_styleSPRING END,SQUARED AND GROUND BOTH ENDS
body_stylePANEL MOUNTPANEL MOUNT
body_width0.859 INCHES MINIMUM AND 0.859 INCHES MINIMUM AND 0.900 INCHES MAXIMUM0.900 INCHES MAXIMUM IN
bore_shapeSTRAIGHT BOTH ENDS
case_styleSQUARE
seal_width0.423 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
body_length1.531 INCHES MINIMUM AND 1.531 INCHES MINIMUM AND 1.570 INCHES MAXIMUM1.570 INCHES MAXIMUM IN
bore_length1.6880 INCHES NOMINAL BOTH ENDS IN
design_formSPOKE
design_typeDISK
NSN5330-00-297-9889
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 21-218 MFR: Legrand ⚠ 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
•
SEALING ELEMENT STYLE: ANGULAR
•
HOUSING BORE DIAMETER: 2.124 INCHES MINIMUM AND 2.126 INCHES MAXIMUM IN
•
MATERIAL: LEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
•
ACCOMMODATED SHAFT DIAMETER: 1.250 INCHES NOMINAL IN
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 1600 FEET PER MINUTE FT
•
SEAL WIDTH: 0.423 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
•
CASE STYLE: SQUARE
TECHNICAL CHARACTERISTICS (FLIS)
SEALING ELEMENT STYLEANGULAR
HOUSING BORE DIAMETER2.124 INCHES MINIMUM AND 2.126 INCHES MAXIMUM IN
MATERIALLEATHER OR RUBBER SYNTHETIC SEALING ELEMENT
ACCOMMODATED SHAFT DIAMETER1.250 INCHES NOMINAL IN
ACCOMMODATED SHAFT MAXIMUM RATED SPEED1600 FEET PER MINUTE FT
SEAL WIDTH0.423 INCHES MINIMUM AND 0.453 INCHES MAXIMUM IN
MATERIALSTEEL CASE
CASE STYLESQUARE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
179291Interchangeable
interchangeable cross-reference
interchangeable
851765Interchangeable
interchangeable cross-reference
interchangeable
505K335Interchangeable
interchangeable cross-reference
interchangeable
21218Interchangeable
interchangeable cross-reference
interchangeable
21351Interchangeable
interchangeable cross-reference
interchangeable
P752DInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-218?
21-218 is a COIL,RADIO FREQUENCY manufactured by Legrand. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21-218?
There are 22 known substitutes for 21-218: 179291, 851765, 505K335 and 19 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-218?
21-218 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-297-9889. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026