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Technical Data Sheet
PartsTable / O-RING / 40403-7 PC. 21
40403-7 PC. 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 40403-7 PC. 21 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5331-01-160-4346, 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
40403-7 PC. 21
NSN: 5331-01-160-4346
FSC: 5331 — O-RING
CAGE: 55378 — TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC (USA)
SPECIFICATIONS
Part Number40403-7 PC. 21
NSN5331-01-160-4346
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 40403-7 PC. 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
KEY FEATURES
•
HARDNESS RATING: 75.0 SHORE DUROMETER A NOMINAL
•
TEMP RATING: -65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
•
MATERIAL: RUBBER SYNTHETIC
•
CROSS-SECTIONAL HEIGHT: 0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
•
CENTER HOLE DIAMETER: 2.082 INCHES MINIMUM AND 2.118 INCHES MAXIMUM IN
•
OUTSIDE DIAMETER: 2.520 INCHES NOMINAL IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-P-83461 MIL SPEC SINGLE MATERIAL RESPONSE
•
ELONGATION PERCENTAGE: 125 MAXIMUM
TECHNICAL CHARACTERISTICS (FLIS)
HARDNESS RATING75.0 SHORE DUROMETER A NOMINAL
TEMP RATING-65.0 FAHRENHEIT AND 275.0 FAHRENHEIT DEGF
MATERIALRUBBER SYNTHETIC
CROSS-SECTIONAL HEIGHT0.205 INCHES MINIMUM AND 0.215 INCHES MAXIMUM IN
CENTER HOLE DIAMETER2.082 INCHES MINIMUM AND 2.118 INCHES MAXIMUM IN
OUTSIDE DIAMETER2.520 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-P-83461 MIL SPEC SINGLE MATERIAL RESPONSE
ELONGATION PERCENTAGE125 MAXIMUM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
72001-1Interchangeable
interchangeable cross-reference
interchangeable
72001Interchangeable
interchangeable cross-reference
interchangeable
503-S 1Interchangeable
interchangeable cross-reference
interchangeable
44071Interchangeable
interchangeable cross-reference
interchangeable
150 1Interchangeable
interchangeable cross-reference
interchangeable
MS28775-006Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 40403-7 PC. 21?
40403-7 PC. 21 is a 40403-7 PC. 21.
What parts can replace 40403-7 PC. 21?
There are 27 known substitutes for 40403-7 PC. 21: 72001-1, 72001, 503-S 1 and 24 more. Substitute compatibility should be verified for your specific system.
Is 40403-7 PC. 21 still available?
40403-7 PC. 21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026