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Technical Data Sheet
PartsTable / COMPONENT / 8540-4
8540-4 ✓ 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 SLIDING BLOCK,T-SLOT is a the manufacturer industrial component. Key specifications include end_item_identification: VALVE GRINDER; FSCM 03950. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5330-00-297-4486, 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
8540-4
NSN: 5330-00-297-4486
FSC: 5330
CAGE: 76680 — FEDERAL-MOGUL CORP CHASSIS PRODUCTS DIV (USA)
SPECIFICATIONS
end_item_identificationVALVE GRINDER; FSCM 03950
NSN5330-00-297-4486
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 8540-4 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
•
ACCOMMODATED SHAFT DIAMETER: 4.750 INCHES NOMINAL IN
•
SEALING ELEMENT STYLE: ANGULAR-EXTERNAL
•
CASE STYLE: SQUARE
•
MATERIAL: LEATHER SEALING ELEMENT A
•
ACCOMMODATED SHAFT MAXIMUM RATED SPEED: 8000 FEET PER MINUTE FT
•
HOUSING BORE DIAMETER: 6.000 INCHES NOMINAL IN
•
SEAL WIDTH: 0.500 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
ACCOMMODATED SHAFT DIAMETER4.750 INCHES NOMINAL IN
SEALING ELEMENT STYLEANGULAR-EXTERNAL
CASE STYLESQUARE
MATERIALLEATHER SEALING ELEMENT A
MATERIALLEATHER SEALING ELEMENT B
ACCOMMODATED SHAFT MAXIMUM RATED SPEED8000 FEET PER MINUTE FT
HOUSING BORE DIAMETER6.000 INCHES NOMINAL IN
SEAL WIDTH0.500 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 6
144EX729Interchangeable
interchangeable cross-reference
interchangeable
85404Interchangeable
interchangeable cross-reference
interchangeable
8540Interchangeable
interchangeable cross-reference
interchangeable
3,326,955Interchangeable
interchangeable cross-reference
interchangeable
866964Interchangeable
Same NIIN cross-reference
interchangeable
00044Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8540-4?
8540-4 is a SLIDING BLOCK,T-SLOT.
What parts can replace 8540-4?
There are 6 known substitutes for 8540-4: 144EX729, 85404, 8540 and 3 more. Substitute compatibility should be verified for your specific system.
Is 8540-4 still available?
8540-4 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