Stirring Bars and Rods
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Stirring Bars and Rods
Products of various sizes, shapes, and material compositions designed to aid in manual or automatic stirring of laboratory solutions. Includes glass stirring rods, magnetic stir bars, and stir bar retrievers.
What Is a Magnetic Stir Bar?
Magnetic stir bars are stirrers or stirring hotplates used with magnets to mix a liquid or solution by creating a vortex.
A number of factors affect magnetic stir bar efficiency and effectiveness, including its size, shape, and material. Sizes (L x Diameter) range from 2 x 2 mm to 159 x 27 mm and shapes include:
- Polygonal or octagonal magnetic stir bars are the most common shapes; the multiple surfaces add turbulence to the mixing action
- Elliptical or egg-shapped stir bars work especially well with round-bottom flasks
- Wedge-shaped spin bars produce more significant turbulence for dissolving salts or in samples containing sediment
- Spin bars with fins or vanes, designed for smaller vessels, tubes, or cuvettes
- Micro (“flea”) stir bars for mixing extremely small samples
What Kind of Magnet Is Used?
Stir bar magnets are typically made from Alnico, a combination of aluminum and nickel. They may also be made from Samarium cobalt, a rare earth metal that produces the stronger magnetic force needed to mix very viscous substances.
Stir bar magnets are usually encapsulated in white or colored PTFE, hard plastic, or borosilicate glass, and coatings may meet FDA grade or USP requirements. PTFE is durable, inert, and can be autoclaved. Glass-encased cylindrical magnets are useful for high-temperature applications.
How Does It Work?
During the stirring process, integral or removable pivot rings on the stir bar reduce contact with the vessel to help avoid marring plastic surfaces. Some round stir bars have slightly raised ends that create a de facto pivot point, while others have more pronounced round centers that help to keep them in motion. Stir bars may be reusable or disposable.
Magnetic stir bars may be sold individually or in magnetic stir bar kits that include multiple bars in a range of sizes.
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Filtered Search Results
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Fisherbrand™ Cylindrical Spinbar Magnetic Stirring Bar
Cylindrical magnetic stirring bars offer excellent centering and smooth-running characteristics.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
DWK Life Sciences Kimble™ KIMAX™ Solid Rod Stirrers
Designed from Federal Specification NNN-R-560, Type I requirements
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Quantity | 800/Cs. |
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Material | Borosilicate Glass |
Certifications/Compliance | USP Type I, ASTM E438, Type I, Class A, NNN-R-560 |
Heidolph™ Magnetic Stirrer Accessory, Stir Bars
Supplier Diversity Partner
Small and/or diverse supplier based on Federal laws and SBA requirements.
Learn More
![SDP](/content/dam/fishersci/glyphs/sdp.png)
Small and/or diverse supplier based on Federal laws and SBA requirements.
Learn More
Stir bars for use with various Heidolph magnetic stirrers
For Use With (Equipment) | Magnetic stirrers |
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Fisherbrand™ Magnetic Stirring Bars
Stirbar assortments come in a convenient storage box. Fisherbrand™ Magnetic Stirring Bars contain PTFE encapsulated Alnico magnets and come in various sizes.
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Type | Stir Bar |
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Material | Alnico Magnet |
Coating | PTFE |
Certifications/Compliance | ISO 9001:2008 |
Fisherbrand™ Micro Stir Bars
Stirring small volumes in vessels such as vials, tubes and grandient makers.
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Autoclavable | Yes |
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Fisherbrand™ Octagon Spinbar™ Magnetic Stirring Bars
Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape for stirring small volumes in vessels such as vials, tubes and gradient makers.
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Color | White |
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Material | Alnico Magnet |
Coating | PTFE |
Certifications/Compliance | ISO 9001:2008 |
Autoclavable | Yes |
Heathrow Scientific™ Magnetic Stir Bar
Magnetic Stir Bar suitable for use with both unheated and heated stirrers.
Type | Magnetic Stir Bar |
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Shape | Octagonal Cylinder |
Color | White |
Quantity | 10 Pk. |
Material | Alnico PTFE |
Autoclavable | Autoclavable |
Fisherbrand™ PTFE Disposable Stir Bars
The multifaceted magnetic stirring bar surface adds turbulence relative to similar size smooth cylindrical stirring bars.
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Type | Stir Bar |
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Shape | Cylinder |
Color | White |
Quantity | 100 |
Material | PTFE |
Coating | PTFE |
Certifications/Compliance | ISO 9001:2008 |
Autoclavable | Yes |
Fisherbrand™ Polygon Stir Bars
Stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.
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Shape | Polygon |
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Quantity | 50 |
Material | Alnico Magnet |
Autoclavable | Yes |
Fisherbrand™ Magnetic Stir Bar Six Packs
These magnetic stirring bars are the most commonly used shape.
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Quantity | 6 Pk. |
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Material | Alnico Magnet |
Coating | PTFE |
Autoclavable | Yes |
Type | Stirring Rod |
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Quantity | Case of 72 |
Material | Glass |
Fisherbrand™ Egg-Shaped Bars
Egg-shaped stirring bars are designed especially for use in round-bottom vessels as they spin unrestricted by the vessel contour.
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Shape | Egg |
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Fisherbrand™ High-Energy Octagon Stir Bar
Composition and octagonal shape produce exceptional power suitable for viscous solutions and high-speed stirring.
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Fisherbrand™ Cross-Type Stir Bars
Agitate liquids in round-bottom test tubes and flasks, where other stir bars cannot be used.
![EDGE](/content/dam/fishersci/glyphs/edge.png)
Height (Metric) | 12.7mm |
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Shape | Cross |
For Use With (Equipment) | Round bottom test tubes and flasks |
Color | White |
Quantity | 50 |
Certifications/Compliance | ISO 9001:2008 |
Autoclavable | Yes |
Height (English) | 0.5 in. |