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Technical Data Sheet
PartsTable / COMPONENT / 40066-2 PC.NO. 40
40066-2 PC.NO. 40 ✓ 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 40066-2 PC.NO. 40 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 5340-01-540-8578, 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
40066-2 PC.NO. 40
NSN: 5340-01-540-8578
FSC: 5340
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
Part Number40066-2 PC.NO. 40
NSN5340-01-540-8578
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 40066-2 PC.NO. 40 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
•
MATERIAL: COPPER ALLOY
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B16 ASSN STD SINGLE MATERIAL RESPONSE
•
NONDEFINITIVE SPEC/STD DATA: 1/2 HARD - PLT, 360 ALLOY
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALCOPPER ALLOY
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B16 ASSN STD SINGLE MATERIAL RESPONSE
NONDEFINITIVE SPEC/STD DATA1/2 HARD - PLT, 360 ALLOY
PART NAME ASSIGNED BY CONTROLLING AGENCYFLANGE PLATE - DUCT MT.
END ITEM IDENTIFICATION2-1/2" TRAC STYLE A FAILSAFE DOUBLE SEAT REVERSE ACTING THERMOSTATIC TEMPERATURE REGULATOR VALVE ASSEMBLY; 4820-01-540-8573
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
B-2 BLACKInterchangeable
interchangeable cross-reference
interchangeable
250-2020-00Interchangeable
interchangeable cross-reference
interchangeable
B2REDInterchangeable
interchangeable cross-reference
interchangeable
27900Interchangeable
interchangeable cross-reference
interchangeable
121577Interchangeable
interchangeable cross-reference
interchangeable
276000Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40066-2 PC.NO. 40?
40066-2 PC.NO. 40 is a 40066-2 PC.NO. 40.
What parts can replace 40066-2 PC.NO. 40?
There are 8 known substitutes for 40066-2 PC.NO. 40: B-2 BLACK, 250-2020-00, B2RED and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40066-2 PC.NO. 40?
40066-2 PC.NO. 40 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-540-8578. 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