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AFB227B — COVER,ACCESS

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

AFB227B: COVER,ACCESS.

The COVER,ACCESS is a the manufacturer industrial component. Key specifications include material: STEEL, body_thickness: 0.250 INCHES NOMINAL IN, inside_diameter: 5.125 INCHES NOMINAL IN, flange_thickness: 0.250 INCHES NOMINAL IN, outside_diameter: 7.750 INCHES NOMINAL IN, bolt_circle_diameter: 6.875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-390-2471, 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
AFB227B
NSN: 5340-00-390-2471
FSC: 5340 — Hardware, Commercial
CAGE: 7PZX0 — FAIRBANKS MORSE, LLC (USA)
SPECIFICATIONS
materialSTEEL
body_thickness0.250 INCHES NOMINAL IN
inside_diameter5.125 INCHES NOMINAL IN
flange_thickness0.250 INCHES NOMINAL IN
outside_diameter7.750 INCHES NOMINAL IN
bolt_circle_diameter6.875 INCHES NOMINAL IN
securing_device_typeTHREADED FASTENER
peripheral_shape_styleROUND, MULTI HOLES
bolt_circle_hole_quantity6
first_recess_inside_height1.125 INCHES NOMINAL IN
cross-sectional_shape_styleCIRCULAR RECESS
NSN5340-00-390-2471
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: AFB227B 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
•
FLANGE THICKNESS: 0.250 INCHES NOMINAL IN
•
BOLT CIRCLE HOLE QUANTITY: 6
•
FIRST RECESS INSIDE HEIGHT: 1.125 INCHES NOMINAL IN
•
CROSS-SECTIONAL SHAPE STYLE: CIRCULAR RECESS
•
OUTSIDE DIAMETER: 7.750 INCHES NOMINAL IN
•
SECURING DEVICE TYPE: THREADED FASTENER
•
INSIDE DIAMETER: 5.125 INCHES NOMINAL IN
•
BOLT CIRCLE DIAMETER: 6.875 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE THICKNESS0.250 INCHES NOMINAL IN
BOLT CIRCLE HOLE QUANTITY6
FIRST RECESS INSIDE HEIGHT1.125 INCHES NOMINAL IN
CROSS-SECTIONAL SHAPE STYLECIRCULAR RECESS
OUTSIDE DIAMETER7.750 INCHES NOMINAL IN
SECURING DEVICE TYPETHREADED FASTENER
INSIDE DIAMETER5.125 INCHES NOMINAL IN
BOLT CIRCLE DIAMETER6.875 INCHES NOMINAL IN
PERIPHERAL SHAPE STYLEROUND, MULTI HOLES
MATERIALSTEEL
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 1
MAFB225BPC6Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AFB227B?
AFB227B is a COVER,ACCESS.
What parts can replace AFB227B?
There is 1 known substitute for AFB227B: MAFB225BPC6. Substitute compatibility should be verified for your specific system.
What is the NSN for AFB227B?
AFB227B is cataloged in the U.S. Government catalog under NSN 5340-00-390-2471. 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.