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661255 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

661255: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 0.680 INCHES NOMINAL IN, length: 3.080 INCHES NOMINAL IN, material: NICKEL ALLOY, hole_diameter: 0.250 INCHES NOMINAL IN, body_thickness: 0.036 INCHES NOMINAL IN, special_features: TWO SECURING SCREWS,SOLUTION HEATREAT IN ARGON. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-413-0841, 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
661255
NSN: 5340-00-413-0841
FSC: 5340 — Hardware, Commercial
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)
SPECIFICATIONS
width0.680 INCHES NOMINAL IN
length3.080 INCHES NOMINAL IN
materialNICKEL ALLOY
hole_diameter0.250 INCHES NOMINAL IN
body_thickness0.036 INCHES NOMINAL IN
special_featuresTWO SECURING SCREWS,SOLUTION HEATREAT IN ARGON
fsc_application_dataTF-30 AIRCRAFT ENGINE
securing_device_typeTHREADED FASTENER
peripheral_shape_styleBAND TYPE
cross-sectional_shape_styleFLAT
mounting_opening_shape_styleUNTHREADED HOLE
NSN5340-00-413-0841
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 661255 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
•
FSC APPLICATION DATA: TF-30 AIRCRAFT ENGINE
•
LENGTH: 3.080 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
CROSS-SECTIONAL SHAPE STYLE: FLAT
•
SECURING DEVICE TYPE: THREADED FASTENER
•
PERIPHERAL SHAPE STYLE: BAND TYPE
•
WIDTH: 0.680 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FSC APPLICATION DATATF-30 AIRCRAFT ENGINE
LENGTH3.080 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
CROSS-SECTIONAL SHAPE STYLEFLAT
SECURING DEVICE TYPETHREADED FASTENER
SPECIAL FEATURESTWO SECURING SCREWS,SOLUTION HEATREAT IN ARGON
PERIPHERAL SHAPE STYLEBAND TYPE
WIDTH0.680 INCHES NOMINAL IN
MATERIALNICKEL ALLOY
HOLE DIAMETER0.250 INCHES NOMINAL IN
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 661255?
661255 is a COVER,ACCESS.
What is the NSN for 661255?
661255 is cataloged in the U.S. Government catalog under NSN 5340-00-413-0841. 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.