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9540K34 — BUMPER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

9540K34: BUMPER.

The BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER, hole_diameter: 0.188 INCHES NOMINAL IN, overall_height: 0.625 INCHES NOMINAL IN, special_features: HARD SBR RUBBER DUROMETER HARDNESS IS 70A A, style_designator: DONUT TOP COUNTERBORED, fastening_device_type: MACHINE SCREW. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-558-5846, 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
9540K34
NSN: 5340-01-558-5846
NIINs: 015585846, 015791758
FSC: 5340 — Hardware, Commercial
CAGE: 3A054 — MCMASTER-CARR SUPPLY CO (USA)
SPECIFICATIONS
materialRUBBER
hole_diameter0.188 INCHES NOMINAL IN
overall_height0.625 INCHES NOMINAL IN
special_featuresHARD SBR RUBBER DUROMETER HARDNESS IS 70A A
style_designatorDONUT TOP COUNTERBORED
fastening_device_typeMACHINE SCREW
first_counterbore_depth0.250 INCHES NOMINAL IN
first_counterbore_diameter0.562 INCHES NOMINAL IN
outside/top_flange_diameter1.031 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyRECESSED BUMPERS
NSN5340-01-558-5846
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: 9540K34 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: 1.031 INCHES NOMINAL IN
•
FIRST COUNTERBORE DIAMETER: 0.562 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT TOP COUNTERBORED
•
FIRST COUNTERBORE DEPTH: 0.250 INCHES NOMINAL IN
•
MATERIAL: RUBBER SYNTHETIC
•
HOLE DIAMETER: 0.188 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.625 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER1.031 INCHES NOMINAL IN
FIRST COUNTERBORE DIAMETER0.562 INCHES NOMINAL IN
STYLE DESIGNATORFLAT TOP COUNTERBORED
FIRST COUNTERBORE DEPTH0.250 INCHES NOMINAL IN
MATERIALRUBBER SYNTHETIC
HOLE DIAMETER0.188 INCHES NOMINAL IN
SUBSTITUTES & CROSS-REFERENCES

No substitute or cross-reference records for this part.

LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 9540K34?
9540K34 is a BUMPER.
What is the NSN for 9540K34?
9540K34 is cataloged in the U.S. Government catalog under NSN 5340-01-558-5846. 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.