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HW21949 — BUMPER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

HW21949: BUMPER.

The BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER BUTADIENE-STYRENE CLASS SBR, hole_diameter: 0.187 INCHES NOMINAL IN, overall_height: 0.374 INCHES NOMINAL IN, style_designator: FLAT TOP COUNTERBORED, first_counterbore_depth: 0.187 INCHES NOMINAL IN, outside/top_flange_diameter: 0.937 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-434-1392, 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
HW21949
NSN: 5340-01-434-1392
FSC: 5340 — Hardware, Commercial
CAGE: L0782 — ARMATEC SURVIVABILITY CORP DIV ARMATEC SURVIVABILITY (CAN)
SPECIFICATIONS
materialRUBBER BUTADIENE-STYRENE CLASS SBR
hole_diameter0.187 INCHES NOMINAL IN
overall_height0.374 INCHES NOMINAL IN
style_designatorFLAT TOP COUNTERBORED
first_counterbore_depth0.187 INCHES NOMINAL IN
outside/top_flange_diameter0.937 INCHES NOMINAL IN
NSN5340-01-434-1392
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: HW21949 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: 0.937 INCHES NOMINAL IN
•
STYLE DESIGNATOR: FLAT TOP COUNTERBORED
•
FIRST COUNTERBORE DEPTH: 0.187 INCHES NOMINAL IN
•
MATERIAL: RUBBER BUTADIENE-STYRENE CLASS SBR
•
HOLE DIAMETER: 0.187 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.374 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER0.937 INCHES NOMINAL IN
STYLE DESIGNATORFLAT TOP COUNTERBORED
FIRST COUNTERBORE DEPTH0.187 INCHES NOMINAL IN
MATERIALRUBBER BUTADIENE-STYRENE CLASS SBR
HOLE DIAMETER0.187 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 HW21949?
HW21949 is a BUMPER.
What is the NSN for HW21949?
HW21949 is cataloged in the U.S. Government catalog under NSN 5340-01-434-1392. 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.