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Technical Data Sheet
PartsTable / COMPONENT / 40755-2 PC. NO. 21
40755-2 PC. NO. 21 ✓ 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 40755-2 PC. NO. 21 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 5340-01-560-0787, 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
40755-2 PC. NO. 21
NSN: 5340-01-560-0787
FSC: 5340
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
Part Number40755-2 PC. NO. 21
NSN5340-01-560-0787
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 40755-2 PC. NO. 21 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
1871Upgraded Successor
successor cross-reference
successor
PLGA1871010Upgraded Successor
successor cross-reference
successor
SP780-104Upgraded Successor
successor cross-reference
successor
75422-11Upgraded Successor
successor cross-reference
successor
S4200F3126958Interchangeable
interchangeable cross-reference
interchangeable
187101Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40755-2 PC. NO. 21?
40755-2 PC. NO. 21 is a 40755-2 PC. NO. 21.
What parts can replace 40755-2 PC. NO. 21?
There are 13 known substitutes for 40755-2 PC. NO. 21: 1871, PLGA1871010, SP780-104 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 40755-2 PC. NO. 21?
40755-2 PC. NO. 21 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5340-01-560-0787. 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