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A00539 — BRAKE BOOSTER ASSEMBLY,MASTER CY

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A00539: BRAKE BOOSTER ASSEMBLY,MASTER CY.

BRAKE BOOSTER ASSEMBLY,MASTER CY. This part is cataloged in the U.S. Government catalog under NSN 5331-00-939-0687, 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
A00539
NSN: 5331-00-939-0687
NIINs: 009390687, 013537331
FSC: 5331 — O-ring
CAGE: F8357 — UNAC (FRA)
SPECIFICATIONS
Part NumberA00539
NSN5331-00-939-0687
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A00539 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 4
2M-9780Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
2000114Reference document
Same NSN cross-reference
Reference document — Secondary reference
449-7302Reference document
Same NSN cross-reference
Reference document — Informative reference only
5CA840Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Shelf-life managedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is A00539?
A00539 is a BRAKE BOOSTER ASSEMBLY,MASTER CY.
What parts can replace A00539?
There are 4 known substitutes for A00539: 2M-9780, 2000114, 449-7302 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A00539?
A00539 is cataloged in the U.S. Government catalog under NSN 5331-00-939-0687. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.