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HW-988 — BUMPER

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

HW-988: BUMPER.

The BUMPER is a the manufacturer industrial component. Key specifications include material: RUBBER, overall_height: 0.268 INCHES NOMINAL IN, groove_diameter: 0.156 INCHES NOMINAL IN, style_designator: DOUBLE FLANGE, top_flange_width: 0.094 INCHES NOMINAL IN, bottom_flange_width: 0.111 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-535-2386, 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
HW-988
NSN: 5340-01-535-2386
FSC: 5340 — Hardware, Commercial
CAGE: 55355 — EMCOR ENCLOSURES LLC (USA)
SPECIFICATIONS
materialRUBBER
overall_height0.268 INCHES NOMINAL IN
groove_diameter0.156 INCHES NOMINAL IN
style_designatorDOUBLE FLANGE
top_flange_width0.094 INCHES NOMINAL IN
bottom_flange_width0.111 INCHES NOMINAL IN
bottom_flange_diameter0.250 INCHES NOMINAL IN
outside/top_flange_diameter0.375 INCHES NOMINAL IN
NSN5340-01-535-2386
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: HW-988 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
•
BOTTOM FLANGE DIAMETER: 0.250 INCHES NOMINAL IN
•
OUTSIDE/TOP FLANGE DIAMETER: 0.375 INCHES NOMINAL IN
•
GROOVE DIAMETER: 0.156 INCHES NOMINAL IN
•
STYLE DESIGNATOR: DOUBLE FLANGE
•
BOTTOM FLANGE WIDTH: 0.111 INCHES NOMINAL IN
•
TOP FLANGE WIDTH: 0.094 INCHES NOMINAL IN
•
MATERIAL: RUBBER
TECHNICAL CHARACTERISTICS
BOTTOM FLANGE DIAMETER0.250 INCHES NOMINAL IN
OVERALL HEIGHT0.268 INCHES NOMINAL IN
OUTSIDE/TOP FLANGE DIAMETER0.375 INCHES NOMINAL IN
GROOVE DIAMETER0.156 INCHES NOMINAL IN
STYLE DESIGNATORDOUBLE FLANGE
BOTTOM FLANGE WIDTH0.111 INCHES NOMINAL IN
TOP FLANGE WIDTH0.094 INCHES NOMINAL IN
MATERIALRUBBER
SUBSTITUTES & CROSS-REFERENCES 2
940080Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
8995-149Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 HW-988?
HW-988 is a BUMPER.
What parts can replace HW-988?
There are 2 known substitutes for HW-988: 940080, 8995-149. Substitute compatibility should be verified for your specific system.
What is the NSN for HW-988?
HW-988 is cataloged in the U.S. Government catalog under NSN 5340-01-535-2386. 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.