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X218-21 — CLAMP,LOOP

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

X218-21: CLAMP,LOOP.

The CLAMP,LOOP is a the manufacturer industrial component. Key specifications include diameter: 0.199 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN, material: STEEL COMP 321 BAND, overall_width: 0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN, style_designator: SINGLE LOOP, tongue_hole_type: ROUND, UNTHREADED, surface_treatment: PASSIVATE BAND. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-982-2389, 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
X218-21
NSN: 5340-00-982-2389
FSC: 5340 — Hardware, Commercial
CAGE: 78570 — SMITHS TUBULAR SYSTEMS-LACONIA, INC. (USA)
SPECIFICATIONS
diameter0.199 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
materialSTEEL COMP 321 BAND
overall_width0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
style_designatorSINGLE LOOP
tongue_hole_typeROUND, UNTHREADED
surface_treatmentPASSIVATE BAND
material_thickness0.059 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
loop_inside_diameter1.312 INCHES NOMINAL IN
cushioning_environmental_protectionHEAT
material_document_and_classificationAMS 5510 ASSN STD SINGLE MATERIAL RESPONSE BAND
distance_from_loop_center_to_tongue_end1.374 INCHES NOMINAL IN
center_to_center_distance_between_loop_and_mounting_hole1.151 INCHES MINIMUM AND 1.161 INCHES MAXIMUM IN
NSN5340-00-982-2389
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: X218-21 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
•
CUSHIONING ENVIRONMENTAL PROTECTION: HEAT
•
STYLE DESIGNATOR: SINGLE LOOP
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5510 ASSN STD SINGLE MATERIAL RESPONSE BAND
•
DIAMETER: 0.199 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.059 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
•
DISTANCE FROM LOOP CENTER TO TONGUE END: 1.374 INCHES NOMINAL IN
•
SURFACE TREATMENT: PASSIVATE BAND
TECHNICAL CHARACTERISTICS
CUSHIONING ENVIRONMENTAL PROTECTIONHEAT
STYLE DESIGNATORSINGLE LOOP
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5510 ASSN STD SINGLE MATERIAL RESPONSE BAND
DIAMETER0.199 INCHES MINIMUM AND 0.209 INCHES MAXIMUM IN
OVERALL WIDTH0.484 INCHES MINIMUM AND 0.516 INCHES MAXIMUM IN
MATERIAL THICKNESS0.059 INCHES MINIMUM AND 0.069 INCHES MAXIMUM IN
DISTANCE FROM LOOP CENTER TO TONGUE END1.374 INCHES NOMINAL IN
SURFACE TREATMENTPASSIVATE BAND
TONGUE HOLE TYPEROUND, UNTHREADED
CENTER TO CENTER DISTANCE BETWEEN LOOP AND MOUNTING HOLE1.151 INCHES MINIMUM AND 1.161 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 1
AS3257-23Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 X218-21?
X218-21 is a CLAMP,LOOP.
What parts can replace X218-21?
There is 1 known substitute for X218-21: AS3257-23. Substitute compatibility should be verified for your specific system.
What is the NSN for X218-21?
X218-21 is cataloged in the U.S. Government catalog under NSN 5340-00-982-2389. 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.