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Technical Data Sheet
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MD00003959 — STRAP,RETAINING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

MD00003959: STRAP,RETAINING.

The STRAP,RETAINING is a the manufacturer industrial component. This part is cataloged in the U.S. Government catalog under NSN 5340-01-676-0240, 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
MD00003959
NSN: 5340-01-676-0240
FSC: 5340 — Hardware, Commercial
CAGE: 6B8L4 — MACK DEFENSE LLC DBA MACK DEFENSE LLC (USA)
SPECIFICATIONS
Part NumberMD00003959
NSN5340-01-676-0240
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: MD00003959 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
SUBSTITUTES & CROSS-REFERENCES 2
MD00003044Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
MD00003870Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is MD00003959?
MD00003959 is a STRAP,RETAINING.
What parts can replace MD00003959?
There are 2 known substitutes for MD00003959: MD00003044, MD00003870. Substitute compatibility should be verified for your specific system.
What is the NSN for MD00003959?
MD00003959 is cataloged in the U.S. Government catalog under NSN 5340-01-676-0240. This indicates validated use in U.S. government and defense supply chains.
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