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9540K29 — BUMPER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

9540K29: BUMPER.

The BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-STYRENE CLASS SBR, hole_depth: 0.218 INCHES NOMINAL IN, hole_diameter: 0.187 INCHES NOMINAL IN, overall_height: 0.406 INCHES NOMINAL IN, special_features: WITHOUT WASHER, style_designator: FLAT TOP COUNTERSUNK COUNTERBORED. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-553-2297, 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
9540K29
NSN: 5340-01-553-2297
FSC: 5340 — Hardware, Commercial
CAGE: 39428 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialRUBBER BUTADIENE-STYRENE CLASS SBR
hole_depth0.218 INCHES NOMINAL IN
hole_diameter0.187 INCHES NOMINAL IN
overall_height0.406 INCHES NOMINAL IN
special_featuresWITHOUT WASHER
style_designatorFLAT TOP COUNTERSUNK COUNTERBORED
countersink_depth0.187 INCHES NOMINAL IN
end_item_identificationMK432 MOD5
first_counterbore_depth0.187 INCHES NOMINAL IN
material_hardness_rating70.0 DUROMETER NOMINAL
first_counterbore_diameter0.375 INCHES NOMINAL IN
outside/top_flange_diameter0.875 INCHES NOMINAL IN
NSN5340-01-553-2297
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 9540K29 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: 0.875 INCHES NOMINAL IN
•
MATERIAL HARDNESS RATING: 70.0 DUROMETER NOMINAL
•
LARGEST COUNTERSINK DIAMETER: 0.875 INCHES NOMINAL IN
•
HOLE DEPTH: 0.218 INCHES NOMINAL IN
•
FIRST COUNTERBORE DIAMETER: 0.375 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT TOP COUNTERSUNK COUNTERBORED
•
COUNTERSINK DEPTH: 0.187 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.406 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER0.875 INCHES NOMINAL IN
MATERIAL HARDNESS RATING70.0 DUROMETER NOMINAL
LARGEST COUNTERSINK DIAMETER0.875 INCHES NOMINAL IN
HOLE DEPTH0.218 INCHES NOMINAL IN
FIRST COUNTERBORE DIAMETER0.375 INCHES NOMINAL IN
STYLE DESIGNATORFLAT TOP COUNTERSUNK COUNTERBORED
COUNTERSINK DEPTH0.187 INCHES NOMINAL IN
FIRST COUNTERBORE DEPTH0.187 INCHES NOMINAL IN
SMALLEST COUNTERSINK DIAMETER0.375 INCHES NOMINAL IN
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

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Shelf-life managedAcquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9540K29?
9540K29 is a BUMPER.
What is the NSN for 9540K29?
9540K29 is cataloged in the U.S. Government catalog under NSN 5340-01-553-2297. 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.