Fisherbrand Round Stir Bar with Removable Pivot Ring 127 mm Length

Fisherbrand 14-512-138 Round Stir Bar – 127 mm x 16 mm, Removable Pivot Ring

The Fisherbrand 14-512-138 is an industrial-strength magnetic stir bar engineered for the high-torque mixing of large liquid volumes. Measuring 127 mm (5 inches) in length with a 16 mm diameter, this bar is designed for use with high-capacity magnetic stirrers in vessels such as 10L to 50L carboys and heavy-walled flasks. It features a high-energy Alnico V magnetic core encapsulated in a seamless, medical-grade PTFE (Polytetrafluoroethylene) coating. The standout feature is the removable pivot ring; when installed, this ring acts as a fulcrum to reduce friction and "chatter" against the bottom of the container, ensuring smooth, centered rotation. The PTFE exterior provides nearly universal chemical resistance and is rated for temperatures from -200°C to +260°C. Fully autoclavable and easy to clean, the 14-512-138 is a robust solution for large-scale reagent preparation, buffer homogenization, and pilot-plant processing.

Technical Performance and Design

• Removable Pivot Ring: Provides the flexibility to use the bar as a standard cylindrical stirrer or as a high-speed pivot stirrer. The ring minimizes surface contact, which prevents "spin-out" and reduces wear on the bottom of the glass vessel.

• Alnico V Magnetic Core: Utilizes a premium permanent magnet alloy to provide maximum coupling strength with the drive magnet of the stirrer, essential for overcoming the resistance of high-viscosity fluids.

• Chemically Inert PTFE Coating: The thick, non-porous fluoropolymer shell is resistant to almost all laboratory chemicals and prevents sample contamination, even during long-term exposure to corrosive acids or bases.

• Seamless Construction: The rounded ends and smooth surface are designed to eliminate crevices where bacteria or cross-contaminants could hide, facilitating rapid and thorough sterilization.

Product Specifications

• Catalog Number: 14-512-138

• Length: 127 mm (5 inches)

• Diameter: 16 mm (5/8 inch)

• Material: PTFE (Teflon) Coating / Alnico V Magnet

• Style: Round with Removable Pivot Ring

• Sterilization: Autoclavable

Key Benefits & Applications

• Large-Scale Buffer Prep: The 5-inch length is ideal for creating deep vortices in large-diameter carboys, ensuring rapid dissolution of salts and powders.

• Industrial Homogenization: Used in pilot plants for the continuous mixing of batches where high torque and chemical inertness are mandatory.

• High-Viscosity Mixing: The heavy mass and powerful magnetic pull of the 14-512-138 make it effective for stirring syrups, oils, and dense biological media.

• Vessel Protection: The pivot ring reduces the physical "scuffing" of the internal floor of expensive glassware, extending the life of the vessel.

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