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Technical Data Sheet
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B123-45 — STOP,MECHANICAL

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

B123-45: STOP,MECHANICAL.

The STOP,MECHANICAL is a the manufacturer industrial component. Key specifications include special_features: STAINLESS STEEL PER QQ-S-764 TYPE 303 OR 303SE,COND A;0.495 IN. O/A DIA IN.

This part is cataloged in the U.S. Government catalog under NSN 5340-00-074-9511, 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
B123-45
NSN: 5340-00-074-9511
FSC: 5340 — Hardware, Commercial
CAGE: 10639 — AVIONICS SPECIALTIES, INC. (USA)
SPECIFICATIONS
special_featuresSTAINLESS STEEL PER QQ-S-764 TYPE 303 OR 303SE,COND A;0.495 IN. O/A DIA IN
NSN5340-00-074-9511
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: B123-45 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
TECHNICAL CHARACTERISTICS
SPECIAL FEATURESSTAINLESS STEEL PER QQ-S-764 TYPE 303 OR 303SE,COND A;0.495 IN. O/A DIA IN
SUBSTITUTES & CROSS-REFERENCES 2
123-45Reference document
Same NSN cross-reference
Reference document — Secondary reference
123-0045Same 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 B123-45?
B123-45 is a STOP,MECHANICAL.
What parts can replace B123-45?
There are 2 known substitutes for B123-45: 123-45, 123-0045. Substitute compatibility should be verified for your specific system.
What is the NSN for B123-45?
B123-45 is cataloged in the U.S. Government catalog under NSN 5340-00-074-9511. This indicates validated use in U.S. government and defense supply chains.
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