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FS4000-12 — O-RING

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

FS4000-12: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE NITRILE, center_hole_diameter: 0.739 INCHES NOMINAL IN, cross-sectional_height: 0.750 INCHES NOMINAL IN, part_name_assigned_by_controlling_agency: 12 BUNA N O-RING. This part is cataloged in the U.S.

Government catalog under NSN 5331-01-620-7133, 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
FS4000-12
NSN: 5331-01-620-7133
FSC: 5331 — O-ring
CAGE: 5E240 — BRENNAN INDUSTRIES (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE NITRILE
center_hole_diameter0.739 INCHES NOMINAL IN
cross-sectional_height0.750 INCHES NOMINAL IN
part_name_assigned_by_controlling_agency12 BUNA N O-RING
NSN5331-01-620-7133
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: FS4000-12 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
•
CROSS-SECTIONAL HEIGHT: 0.750 INCHES NOMINAL IN
•
CENTER HOLE DIAMETER: 0.739 INCHES NOMINAL IN
•
MATERIAL: RUBBER BUTADIENE NITRILE
TECHNICAL CHARACTERISTICS
CROSS-SECTIONAL HEIGHT0.750 INCHES NOMINAL IN
CENTER HOLE DIAMETER0.739 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCY12 BUNA N O-RING
MATERIALRUBBER BUTADIENE NITRILE
OTHER ITEMS IN FSC 5331 — O-ring
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5331-00-001-1971 5331-00-001-1979 5331-00-001-3904 5331-00-001-3905 5331-00-001-3906 5331-00-001-3908 5331-00-001-3923 5331-00-001-3924
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is FS4000-12?
FS4000-12 is a O-RING.
What is the NSN for FS4000-12?
FS4000-12 is cataloged in the U.S. Government catalog under NSN 5331-01-620-7133. 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.