Beckman Coulter O-Ring for JA-14 Rotor Lid 177.5 mm ID

Beckman Coulter Replacement Elastomeric O-Ring – 177.5 mm Inner Diameter, Vacuum-Tight Sealing Gasket for JA-14 Centrifuge Rotor Lid (MPN: 870138)

The Beckman Coulter 870138 (also cataloged as 870138-EA or Beckman P/N 870138) is an essential, high-precision replacement elastomeric sealing O-ring engineered specifically for the lid assembly of the Beckman Coulter JA-14 fixed-angle centrifuge rotor. Measuring exactly 177.5 mm in inner diameter (ID), this vacuum-tight sealing ring seats precisely into the perimeter channel of the aluminum rotor lid. Built from a chemical-resistant, high-durometer synthetic rubber compound, it maintains structural elasticity and sealing integrity under extreme centrifugal acceleration forces (up to 30,100 x g at 14,000 RPM) and deep vacuum environments inside High-Performance and Avanti J-Series centrifuges. Routine replacement of this primary gasket prevents vacuum loss, seals against liquid sample leaks, and ensures safe, biosafety-compliant operation during high-speed pelleting loops.

Technical Performance and Engineering

• Vacuum-Tight Elastomeric Compound: Formulated from high-durability synthetic rubber designed to resist chemical degradation from common laboratory buffers, density gradient media, and mild organic solvents while maintaining a reliable vacuum seal under active chamber evacuation.

• Precision Channel Fit: Molded to exact OEM dimensional tolerances (177.5 mm ID) to seat snugly into the primary perimeter groove of the JA-14 rotor lid without stretching out of shape, bunching, or slipping during lid placement.

• Biosafety and Leak Prevention: Establishes a hermetic boundary across the outer lip of the rotor body, containing bioaerosols and liquid spills within the rotor cavity in the event of tube failure at high speeds.

• High-RCF Mechanical Resilience: Resists permanent compression set and physical deformation under continuous stress cycles up to 14,000 RPM, preserving long-term elasticity across repeated runs.

Product Specifications

• Part Number / MPN: 870138 (Cross-listed as 870138-EA / Beckman Coulter 870138)

• Manufacturer / Brand: Beckman Coulter, Inc.

• Inner Diameter (ID): 177.5 mm nominal

• Component Type: Replacement Perimeter Lid Sealing O-Ring Gasket

• Material Composition: High-Durometer Synthetic Elastomer (Buna-N / Nitrile Rubber Compound)

• Rotor Platform Compatibility: Specifically designed for the Beckman Coulter JA-14 Fixed-Angle Rotor (6 x 250 mL capacity)

• Centrifuge System Interoperability: Compatible with Beckman Avanti J-Series (J-25, J-26S, J-E, JXN-26) and classic J2-Series High-Performance Centrifuges

Key Benefits and Maintenance Applications

• Preventative Centrifuge Maintenance: Serves as a vital consumable replacement when original rotor lid O-rings become dried out, cracked, stretched, or pitted from age and chemical exposure.

• Chamber Vacuum Error Elimination: Eliminates common "Chamber Vacuum Leak" warnings on Avanti J-Series centrifuges caused by worn or hardened lid gaskets failing to seal under vacuum draw.

• Straightforward Replacement: Installs manually into the rotor lid groove without requiring specialized tools. Recommended to be lightly lubricated with Spinkote silicone grease prior to operation for optimal seating and seal life.

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