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A8991 — SEAL KIT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

A8991: SEAL KIT.

The SEAL KIT is a the manufacturer industrial component. Key specifications include width: 3.062 INCHES NOMINAL IN, length: 3.250 INCHES NOMINAL IN, material: STEEL, inside_width: 2.812 INCHES NOMINAL IN, corner_radius: 0.312 INCHES NOMINAL IN, hole_diameter: 0.312 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-00-358-2352, 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
A8991
NSN: 5340-00-358-2352
NIINs: 003582352, 012542314
FSC: 5340 — Hardware, Commercial
CAGE: 96787 — STEWART AVIONICS INC (USA)
SPECIFICATIONS
width3.062 INCHES NOMINAL IN
length3.250 INCHES NOMINAL IN
materialSTEEL
inside_width2.812 INCHES NOMINAL IN
corner_radius0.312 INCHES NOMINAL IN
hole_diameter0.312 INCHES NOMINAL IN
inside_length2.812 INCHES NOMINAL IN
body_thickness0.059 INCHES NOMINAL IN
flange_thickness0.059 INCHES NOMINAL IN
securing_device_typeSPECIAL
peripheral_shape_styleRECTANGLE, ONE CENTER HOLE
first_recess_inside_height0.375 INCHES NOMINAL IN
NSN5340-00-358-2352
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: A8991 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
•
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH: 1.625 INCHES NOMINAL IN
•
INSIDE WIDTH: 2.812 INCHES NOMINAL IN
•
CORNER RADIUS: 0.312 INCHES NOMINAL IN
•
LENGTH: 3.250 INCHES NOMINAL IN
•
INSIDE LENGTH: 2.812 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.059 INCHES NOMINAL IN
•
FIRST RECESS INSIDE HEIGHT: 0.375 INCHES NOMINAL IN
•
MOUNTING OPENING SHAPE STYLE: UNTHREADED HOLE
TECHNICAL CHARACTERISTICS
DISTANCE FROM FIRST HOLE CENTERLINE TO END ALONG WIDTH1.625 INCHES NOMINAL IN
INSIDE WIDTH2.812 INCHES NOMINAL IN
CORNER RADIUS0.312 INCHES NOMINAL IN
LENGTH3.250 INCHES NOMINAL IN
INSIDE LENGTH2.812 INCHES NOMINAL IN
FLANGE THICKNESS0.059 INCHES NOMINAL IN
FIRST RECESS INSIDE HEIGHT0.375 INCHES NOMINAL IN
MOUNTING OPENING SHAPE STYLEUNTHREADED HOLE
CROSS-SECTIONAL SHAPE STYLESQUARE OR RECTANGULAR RECESS
SECURING DEVICE TYPESPECIAL
SUBSTITUTES & CROSS-REFERENCES 4
1354Reference document
Same NSN cross-reference
Reference document — Secondary reference
110A121Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
01002Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
110A166Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
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 A8991?
A8991 is a SEAL KIT.
What parts can replace A8991?
There are 4 known substitutes for A8991: 1354, 110A121, 01002 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A8991?
A8991 is cataloged in the U.S. Government catalog under NSN 5340-00-358-2352. 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.