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Technical Data Sheet
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EX4939 — EX4939

✓ Government record, cited
AM GENERAL LLC · ORING SEAL
PRODUCT OVERVIEW

EX4939: EX4939.

The EX4939 is a AM GENERAL LLC industrial component. This part is cataloged in the U.S. Government catalog under NSN 5340-01-457-5734, 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
EX4939
NSN: 5340-01-457-5734
FSC: 5340 — Hardware, Commercial
CAGE: 34623 — AM GENERAL LLC (USA)
SPECIFICATIONS
Part NumberEX4939
ManufacturerAM GENERAL LLC
NSN5340-01-457-5734
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: EX4939 MFR: AM GENERAL LLC ⚠ 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
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FIRST LEG DISTANCE FROM EDGE TO HOLE CENTER ALONG LENGTH: 0.4040 INCHES NOMINAL IN
•
FIRST LEG HOLE DIAMETER: 0.4000 INCHES NOMINAL IN
•
FIRST LEG ANGLE: 90.0 DEGREES NOMINAL
•
FIRST LEG DISTANCE BETWEEN HOLE CENTERS ALONG WIDTH: 2.4000 INCHES NOMINAL IN
•
SECOND LEG RELATIONSHIP TO FIRST LEG: NOT IDENTICAL
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SECOND LEG WIDTH: 1.3100 INCHES NOMINAL IN
•
SECOND LEG LENGTH: 3.2200 INCHES NOMINAL IN
•
FIRST LEG HOLE ARRANGEMENT STYLE: TWO HOLES
TECHNICAL CHARACTERISTICS
FIRST LEG DISTANCE FROM EDGE TO HOLE CENTER ALONG LENGTH0.4040 INCHES NOMINAL IN
FIRST LEG HOLE DIAMETER0.4000 INCHES NOMINAL IN
FIRST LEG ANGLE90.0 DEGREES NOMINAL
FIRST LEG DISTANCE BETWEEN HOLE CENTERS ALONG WIDTH2.4000 INCHES NOMINAL IN
SECOND LEG RELATIONSHIP TO FIRST LEGNOT IDENTICAL
SECOND LEG WIDTH1.3100 INCHES NOMINAL IN
SECOND LEG LENGTH3.2200 INCHES NOMINAL IN
FIRST LEG HOLE ARRANGEMENT STYLETWO HOLES
STYLE DESIGNATORANGLE
FIRST LEG STYLESQUARE
SUBSTITUTES & CROSS-REFERENCES 2
ECEX4939B1Reference document
Same NSN cross-reference
Reference document — Secondary reference
5340PL0715276Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is EX4939?
EX4939 is a EX4939 manufactured by AM GENERAL LLC.
What parts can replace EX4939?
There are 2 known substitutes for EX4939: ECEX4939B1, 5340PL0715276. Substitute compatibility should be verified for your specific system.
What is the NSN for EX4939?
EX4939 is cataloged in the U.S. Government catalog under NSN 5340-01-457-5734. This indicates validated use in U.S. government and defense supply chains.
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