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539440-9 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

539440-9: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include width: 2.250 INCHES NOMINAL IN, length: 2.250 INCHES NOMINAL IN, material: STEEL, hole_diameter: 1.062 INCHES NOMINAL IN, surface_treatment: CADMIUM, securing_device_type: PAWL. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-187-4243, 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
539440-9
NSN: 5340-00-187-4243
FSC: 5340 — Hardware, Commercial
CAGE: 24821 — ROSEMOUNT ANALYTICAL, INC. DIV PROCESS ANALYTICAL DIVISION (USA)
SPECIFICATIONS
width2.250 INCHES NOMINAL IN
length2.250 INCHES NOMINAL IN
materialSTEEL
hole_diameter1.062 INCHES NOMINAL IN
surface_treatmentCADMIUM
securing_device_typePAWL
peripheral_shape_styleRECTANGLE, MULTI HOLES
mounting_opening_shape_styleUNTHREADED HOLE
surface_treatment_document_and_classification+45N DELCO-RENY DIVISION OF GENERAL MOTOR CORPORATION MFR REF SINGLE TREATMENT RESPONSE
NSN5340-00-187-4243
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 539440-9 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
•
LENGTH: 2.250 INCHES NOMINAL IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: +45N DELCO-RENY DIVISION OF GENERAL MOTOR CORPORATION MFR REF SINGLE TREATMENT RESPONSE
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
SECURING DEVICE TYPE: PAWL
•
SURFACE TREATMENT: CADMIUM
•
PERIPHERAL SHAPE STYLE: RECTANGLE, MULTI HOLES
•
WIDTH: 2.250 INCHES NOMINAL IN
•
MATERIAL: STEEL
TECHNICAL CHARACTERISTICS
LENGTH2.250 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION+45N DELCO-RENY DIVISION OF GENERAL MOTOR CORPORATION MFR REF SINGLE TREATMENT RESPONSE
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
SECURING DEVICE TYPEPAWL
SURFACE TREATMENTCADMIUM
PERIPHERAL SHAPE STYLERECTANGLE, MULTI HOLES
WIDTH2.250 INCHES NOMINAL IN
MATERIALSTEEL
HOLE DIAMETER1.062 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 2
177327Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
139322Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 539440-9?
539440-9 is a COVER,ACCESS.
What parts can replace 539440-9?
There are 2 known substitutes for 539440-9: 177327, 139322. Substitute compatibility should be verified for your specific system.
What is the NSN for 539440-9?
539440-9 is cataloged in the U.S. Government catalog under NSN 5340-00-187-4243. This indicates validated use in U.S. government and defense supply chains.
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