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RM-280B — MOUNT,RESILIENT,UTILITY

✓ Government record, cited
— · ORING SEAL
PRODUCT OVERVIEW

RM-280B: MOUNT,RESILIENT,UTILITY.

The MOUNT,RESILIENT,UTILITY is a the manufacturer industrial component. Key specifications include height: 1.250 INCHES NOMINAL IN, material: RUBBER SYNTHETIC OVERALL, load_rating: 280.0 POUNDS MAXIMUM LBS, thread_size: 0.375 FIRST THREADED PORTION, flange_width: 2.375 INCHES NOMINAL IN, flange_length: 3.875 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5340-01-642-9275, 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
RM-280B
NSN: 5340-01-642-9275
FSC: 5340 — Hardware, Commercial
CAGE: 55687 — CALIFORNIA DYNAMICS CORP DBA CALDYN LOS ANGELES CA (USA)
SPECIFICATIONS
height1.250 INCHES NOMINAL IN
materialRUBBER SYNTHETIC OVERALL
load_rating280.0 POUNDS MAXIMUM LBS
thread_size0.375 FIRST THREADED PORTION
flange_width2.375 INCHES NOMINAL IN
flange_length3.875 INCHES NOMINAL IN
flange_thickness0.219 INCHES NOMINAL IN
style_designatorSQUARE W/INTERNALLY THREADED FLANGE TWO-HOLE FLANGE
flange_mounting_hole_diameter0.344 INCHES NOMINAL IN
distance_between_mounting_hole_centers3.000 INCHES NOMINAL IN
part_name_assigned_by_controlling_agencyNEOPRENE MOUNT
NSN5340-01-642-9275
COMPONENT DIAGRAM
O-RING / SEAL — MATERIAL DETERMINES APPLICATION ID: — CROSS-SECTION CS: — SPECIFICATION Material: — Durometer: — Temp: — PN: RM-280B 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
•
FLANGE MOUNTING HOLE DIAMETER: 0.344 INCHES NOMINAL IN
•
LOAD RATING: 280.0 POUNDS MAXIMUM LBS
•
DISTANCE BETWEEN MOUNTING HOLE CENTERS: 3.000 INCHES NOMINAL IN
•
FLANGE THICKNESS: 0.219 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SQUARE W/INTERNALLY THREADED FLANGE TWO-HOLE FLANGE
•
FLANGE LENGTH: 3.875 INCHES NOMINAL IN
•
HEIGHT: 1.250 INCHES NOMINAL IN
•
THREAD SIZE: 0.375 FIRST THREADED PORTION
TECHNICAL CHARACTERISTICS
FLANGE MOUNTING HOLE DIAMETER0.344 INCHES NOMINAL IN
LOAD RATING280.0 POUNDS MAXIMUM LBS
DISTANCE BETWEEN MOUNTING HOLE CENTERS3.000 INCHES NOMINAL IN
FLANGE THICKNESS0.219 INCHES NOMINAL IN
STYLE DESIGNATORSQUARE W/INTERNALLY THREADED FLANGE TWO-HOLE FLANGE
FLANGE LENGTH3.875 INCHES NOMINAL IN
HEIGHT1.250 INCHES NOMINAL IN
THREAD SIZE0.375 FIRST THREADED PORTION
FLANGE WIDTH2.375 INCHES NOMINAL IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNEOPRENE MOUNT
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
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is RM-280B?
RM-280B is a MOUNT,RESILIENT,UTILITY.
What is the NSN for RM-280B?
RM-280B is cataloged in the U.S. Government catalog under NSN 5340-01-642-9275. 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.