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4521-18-31-1C2 — CLIP,SPRING TENSION

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

4521-18-31-1C2: CLIP,SPRING TENSION.

The CLIP,SPRING TENSION is a the manufacturer industrial component. Key specifications include width: 0.3020 INCHES MINIMUM AND 0.3220 INCHES MAXIMUM IN, length: 0.1800 INCHES MINIMUM AND 0.2200 INCHES MAXIMUM IN, material: COPPER ALLOY 170 OR COPPER ALLOY 172 OVERALL, hole_diameter: 0.0680 INCHES MINIMUM AND 0.0740 INCHES MAXIMUM IN, overall_height: 0.0230 INCHES MINIMUM AND 0.0270 INCHES MAXIMUM IN, style_designator: STANDOFF. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-451-0768, 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
4521-18-31-1C2
NSN: 5340-01-451-0768
FSC: 5340 — Hardware, Commercial
CAGE: 86928 — SEASTROM MANUFACTURING CO INC (USA)
SPECIFICATIONS
width0.3020 INCHES MINIMUM AND 0.3220 INCHES MAXIMUM IN
length0.1800 INCHES MINIMUM AND 0.2200 INCHES MAXIMUM IN
materialCOPPER ALLOY 170 OR COPPER ALLOY 172 OVERALL
hole_diameter0.0680 INCHES MINIMUM AND 0.0740 INCHES MAXIMUM IN
hole_quantity2
overall_height0.0230 INCHES MINIMUM AND 0.0270 INCHES MAXIMUM IN
style_designatorSTANDOFF
material_thickness0.0070 INCHES MINIMUM AND 0.0130 INCHES MAXIMUM IN
loop/holding_dimension0.1750 INCHES NOMINAL IN
material_document_and_classificationASTM-B-194 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5340-01-451-0768
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 4521-18-31-1C2 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
•
LENGTH: 0.1800 INCHES MINIMUM AND 0.2200 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: STANDOFF
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM-B-194 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
LOOP/HOLDING DIMENSION: 0.1750 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.0070 INCHES MINIMUM AND 0.0130 INCHES MAXIMUM IN
•
WIDTH: 0.3020 INCHES MINIMUM AND 0.3220 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY 170 OR COPPER ALLOY 172 OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.0230 INCHES MINIMUM AND 0.0270 INCHES MAXIMUM IN
LENGTH0.1800 INCHES MINIMUM AND 0.2200 INCHES MAXIMUM IN
STYLE DESIGNATORSTANDOFF
MATERIAL DOCUMENT AND CLASSIFICATIONASTM-B-194 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
LOOP/HOLDING DIMENSION0.1750 INCHES NOMINAL IN
MATERIAL THICKNESS0.0070 INCHES MINIMUM AND 0.0130 INCHES MAXIMUM IN
WIDTH0.3020 INCHES MINIMUM AND 0.3220 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY 170 OR COPPER ALLOY 172 OVERALL
HOLE QUANTITY2
HOLE DIAMETER0.0680 INCHES MINIMUM AND 0.0740 INCHES MAXIMUM IN
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
130786-1Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 4521-18-31-1C2?
4521-18-31-1C2 is a CLIP,SPRING TENSION.
What parts can replace 4521-18-31-1C2?
There is 1 known substitute for 4521-18-31-1C2: 130786-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 4521-18-31-1C2?
4521-18-31-1C2 is cataloged in the U.S. Government catalog under NSN 5340-01-451-0768. 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.