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6539855-1 — STOP,MECHANICAL

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

6539855-1: STOP,MECHANICAL.

The STOP,MECHANICAL is a the manufacturer industrial component. Key specifications include design_type: FLANGE, overall_width: 4.375 INCHES NOMINAL IN, overall_height: 1.140 INCHES NOMINAL IN, overall_length: 1.375 INCHES NOMINAL IN, special_features: HOLE EDGES MIN. DIA.

015,MAX DIA .040,,ONE HOLE CSK. 90 DEGREE MIN X DIA; THREAD 1.000-12 UNF 2B. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-369-8618, 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
6539855-1
NSN: 5340-01-369-8618
FSC: 5340 — Hardware, Commercial
CAGE: 53711 — NAVAL SEA SYSTEMS COMMAND (USA)
SPECIFICATIONS
design_typeFLANGE
overall_width4.375 INCHES NOMINAL IN
overall_height1.140 INCHES NOMINAL IN
overall_length1.375 INCHES NOMINAL IN
special_featuresHOLE EDGES MIN. DIA. 015,MAX DIA .040,,ONE HOLE CSK. 90 DEGREE MIN X DIA; THREAD 1.000-12 UNF 2B
NSN5340-01-369-8618
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 6539855-1 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
•
DESIGN TYPE: FLANGE
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT1.140 INCHES NOMINAL IN
DESIGN TYPEFLANGE
OVERALL LENGTH1.375 INCHES NOMINAL IN
OVERALL WIDTH4.375 INCHES NOMINAL IN
SPECIAL FEATURESHOLE EDGES MIN. DIA. 015,MAX DIA .040,,ONE HOLE CSK. 90 DEGREE MIN X DIA; THREAD 1.000-12 UNF 2B
OTHER ITEMS IN FSC 5340 — Hardware, Commercial
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5340-00-000-0068 5340-00-000-0132 5340-00-000-8150 5340-00-001-1251 5340-00-001-1264 5340-00-001-1265 5340-00-001-1266 5340-00-001-1275
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 6539855-1?
6539855-1 is a STOP,MECHANICAL.
What is the NSN for 6539855-1?
6539855-1 is cataloged in the U.S. Government catalog under NSN 5340-01-369-8618. 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.