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421905-C1 — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

421905-C1: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: IRON MALLEABLE, ear_radius: 0.500 INCHES NOMINAL IN, body_radius: 3.750 INCHES NOMINAL IN, hole_diameter: 0.406 INCHES NOMINAL IN, body_thickness: 0.250 INCHES NOMINAL IN, inside_diameter: 1.125 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-133-1460, 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
421905-C1
NSN: 5340-01-133-1460
FSC: 5340 — Hardware, Commercial
CAGE: 89346 — NAVISTAR INTL CORP TRUCK BR OHIO PLANT (USA)
SPECIFICATIONS
materialIRON MALLEABLE
ear_radius0.500 INCHES NOMINAL IN
body_radius3.750 INCHES NOMINAL IN
hole_diameter0.406 INCHES NOMINAL IN
body_thickness0.250 INCHES NOMINAL IN
inside_diameter1.125 INCHES NOMINAL IN
inverted_radius0.250 INCHES NOMINAL IN
bolt_circle_diameter4.125 INCHES NOMINAL IN
inside_corner_radius0.250 INCHES NOMINAL IN
securing_device_typeSPECIAL
peripheral_shape_styleROUND, THREE EARS AND HOLES
first_recess_inside_height0.578 INCHES NOMINAL IN
NSN5340-01-133-1460
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 421905-C1 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
•
INSIDE CORNER RADIUS: 0.250 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.578 INCHES NOMINAL IN
•
EAR RADIUS: 0.500 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM A47-61 ASSN STD SINGLE MATERIAL RESPONSE
•
CROSS-SECTIONAL SHAPE STYLE: CIRCULAR RECESS
•
INVERTED RADIUS: 0.250 INCHES NOMINAL IN
•
SECURING DEVICE TYPE: SPECIAL
TECHNICAL CHARACTERISTICS
INSIDE CORNER RADIUS0.250 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.578 INCHES NOMINAL IN
EAR RADIUS0.500 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
MATERIAL DOCUMENT AND CLASSIFICATIONASTM A47-61 ASSN STD SINGLE MATERIAL RESPONSE
CROSS-SECTIONAL SHAPE STYLECIRCULAR RECESS
INVERTED RADIUS0.250 INCHES NOMINAL IN
SECURING DEVICE TYPESPECIAL
BODY RADIUS3.750 INCHES NOMINAL IN
INSIDE DIAMETER1.125 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES 5
081475Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
81475Reference document
Same NSN cross-reference
Reference document — Secondary reference
02-7089867Reference document
Same NSN cross-reference
Reference document — Secondary reference
D8HZ-4A421-BReference document
Same NSN cross-reference
Reference document — Secondary reference
692579Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 421905-C1?
421905-C1 is a COVER,ACCESS.
What parts can replace 421905-C1?
There are 5 known substitutes for 421905-C1: 081475, 81475, 02-7089867 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 421905-C1?
421905-C1 is cataloged in the U.S. Government catalog under NSN 5340-01-133-1460. 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.