PartsTable
Technical Data Sheet
Download PDF

9540K28 — BUMPER,AIRCRAFT,MAT

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

9540K28: BUMPER,AIRCRAFT,MAT.

The BUMPER,AIRCRAFT,MAT is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-STYRENE CLASS SBR, hole_diameter: 0.250 INCHES NOMINAL IN, overall_height: 0.750 INCHES NOMINAL IN, special_features: WITH METAL WASHER EMBEDDED AT BASE OF RECESS, style_designator: PAN TOP COUNTERBORED, first_counterbore_depth: 0.375 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-342-8840, 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
9540K28
NSN: 5340-01-342-8840
NIINs: 013428840, 015585891
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-STYRENE CLASS SBR
hole_diameter0.250 INCHES NOMINAL IN
overall_height0.750 INCHES NOMINAL IN
special_featuresWITH METAL WASHER EMBEDDED AT BASE OF RECESS
style_designatorPAN TOP COUNTERBORED
first_counterbore_depth0.375 INCHES NOMINAL IN
material_hardness_rating70.0 DUROMETER NOMINAL
first_counterbore_diameter0.750 INCHES NOMINAL IN
outside/top_flange_diameter1.500 INCHES NOMINAL IN
NSN5340-01-342-8840
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 9540K28 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
•
OUTSIDE/TOP FLANGE DIAMETER: 1.500 INCHES NOMINAL IN
•
MATERIAL HARDNESS RATING: 70.0 DUROMETER NOMINAL
•
FIRST COUNTERBORE DIAMETER: 0.750 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PAN TOP COUNTERBORED
•
FIRST COUNTERBORE DEPTH: 0.375 INCHES NOMINAL IN
•
COLOR: BLACK
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.750 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER1.500 INCHES NOMINAL IN
MATERIAL HARDNESS RATING70.0 DUROMETER NOMINAL
FIRST COUNTERBORE DIAMETER0.750 INCHES NOMINAL IN
STYLE DESIGNATORPAN TOP COUNTERBORED
FIRST COUNTERBORE DEPTH0.375 INCHES NOMINAL IN
COLORBLACK
SPECIAL FEATURESWITH METAL WASHER EMBEDDED AT BASE OF RECESS
MATERIALRUBBER BUTADIENE-STYRENE CLASS SBR
HOLE DIAMETER0.250 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
Ready to buy 9540K28?
Compare prices from verified sellers on eBay
Buy on eBay →
As an eBay Partner, PartsTable may earn a commission. Your price is not affected.
FREQUENTLY ASKED QUESTIONS
What is 9540K28?
9540K28 is a BUMPER,AIRCRAFT,MAT.
What is the NSN for 9540K28?
9540K28 is cataloged in the U.S. Government catalog under NSN 5340-01-342-8840. This indicates validated use in U.S. government and defense supply chains.
Community Feedback
Leave a Comment
Comments are reviewed before appearing. You will receive an email to verify before your comment appears.

Request a Quote — 9540K28

✓ 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.