PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 66A4
66A4 ✓ Verified by PartsTable
— · ORING SEAL
WHAT YOU NEED TO KNOW
Material determines chemical compatibility Standard durometer is 70 Shore A
Wrong material = catastrophic seal failure
PRODUCT OVERVIEW

The PLUG,EXPANSION is a the manufacturer industrial component. Key specifications include radius: 1.625 INCHES NOMINAL IN, material: COPPER ALLOY, outside_diameter: 1.250 INCHES NOMINAL IN, style_designator: CONCAVE, material_thickness: 0.081 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-282-7383, 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
66A4
NSN: 5340-00-282-7383
FSC: 5340
CAGE: 69266 — COOPER INDUSTRIES INC INDUSTRIAL MACHINERY DIV (USA)
SPECIFICATIONS
radius1.625 INCHES NOMINAL IN
materialCOPPER ALLOY
outside_diameter1.250 INCHES NOMINAL IN
style_designatorCONCAVE
material_thickness0.081 INCHES NOMINAL IN
NSN5340-00-282-7383
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 66A4 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
•
RADIUS: 1.625 INCHES NOMINAL IN
•
OUTSIDE DIAMETER: 1.250 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.081 INCHES NOMINAL IN
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL: COPPER ALLOY
TECHNICAL CHARACTERISTICS (FLIS)
RADIUS1.625 INCHES NOMINAL IN
OUTSIDE DIAMETER1.250 INCHES NOMINAL IN
MATERIAL THICKNESS0.081 INCHES NOMINAL IN
STYLE DESIGNATORCONCAVE
MATERIALCOPPER ALLOY
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
S707Interchangeable
interchangeable cross-reference
interchangeable
609AInterchangeable
interchangeable cross-reference
interchangeable
A-A-1354Interchangeable
interchangeable cross-reference
interchangeable
GGG-W-636Interchangeable
interchangeable cross-reference
interchangeable
17919Interchangeable
interchangeable cross-reference
interchangeable
M16377/58-351Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
Ready to buy 66A4?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 66A4?
66A4 is a PLUG,EXPANSION.
What parts can replace 66A4?
There are 17 known substitutes for 66A4: S707, 609A, A-A-1354 and 14 more. Substitute compatibility should be verified for your specific system.
Is 66A4 still available?
66A4 is currently cancelled.
Community Feedback
Comments (0)
No comments yet. Be the first to share what you know.
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 66A4

✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026