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Technical Data Sheet
PartsTable / COMPONENT / 1/2-3
1/2-3 ✓ 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 1/2-3 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-869-1841, 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
1/2-3
NSN: 5340-00-869-1841
FSC: 5340
CAGE: 85480 — BRADY UNITED STATES (USA)
SPECIFICATIONS
Part Number1/2-3
NSN5340-00-869-1841
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 1/2-3 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
•
CENTER TO CENTER DISTANCE BETWEEN LOOP AND MOUNTING HOLE: 0.542 INCHES NOMINAL IN
•
LOOP INSIDE DIAMETER: 0.500 INCHES NOMINAL IN
•
DIAMETER: 0.203 INCHES NOMINAL IN
•
TONGUE HOLE TYPE: ROUND, UNTHREADED
•
STYLE DESIGNATOR: SINGLE LOOP
•
MATERIAL: PLASTIC POLYAMIDE NYLON BAND
•
MATERIAL THICKNESS: 0.036 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
CENTER TO CENTER DISTANCE BETWEEN LOOP AND MOUNTING HOLE0.542 INCHES NOMINAL IN
LOOP INSIDE DIAMETER0.500 INCHES NOMINAL IN
DIAMETER0.203 INCHES NOMINAL IN
TONGUE HOLE TYPEROUND, UNTHREADED
STYLE DESIGNATORSINGLE LOOP
MATERIALPLASTIC POLYAMIDE NYLON BAND
MATERIAL THICKNESS0.036 INCHES NOMINAL IN
OVERALL WIDTH0.500 INCHES NOMINAL IN
DISTANCE FROM LOOP CENTER TO TONGUE END0.745 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
1-2-4T140Upgraded Successor
successor cross-reference
successor
NPC8Upgraded Successor
successor cross-reference
successor
777Upgraded Successor
successor cross-reference
successor
123Upgraded Successor
successor cross-reference
successor
214-1043P7Interchangeable
Same NIIN cross-reference
interchangeable
1673335-7Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1/2-3?
1/2-3 is a 1/2-3.
What parts can replace 1/2-3?
There are 8 known substitutes for 1/2-3: 1-2-4T140, NPC8, 777 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1/2-3?
1/2-3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-00-869-1841. 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