SP Bel-Art Spinbar Teflon Polygon Magnetic Stirring Bar; 25 x 6mm, White, Pivot Ring (F37122-0025)

Amazon.com Price: $12.00$18.87 (as of 23/03/2023 20:14 PST- Details)

Material Polytetrafluoroethylene
Brand SP Bel-Art
Item Dimensions LxWxH 4 x 3 x 0.75 inches
Color White
Shape Polygon

About This Item

  • Polygonal shape is smoother than an octagonal shape and creates more turbulence and a stronger vortex than a round, cylindrical shape
  • Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning
  • Built-in pivot ring helps reduce vibration and wear during stirring
  • Internal magnet made from alnico V, an alloy of aluminum, nickel, iron, and cobalt
  • Casing material is approved for use in food, drug, and cosmetic applications

Product Specifications

Ean 7806382247209
Item Diameter 6 millimeters
Item Weight 0.160 ounces
Length 25 millimeters
Model Number 371220025
Number of Items 1
Part Number 371220025
Size 1 x 1/4″ (25 x 6 mm)
UNSPSC Code 41120000

Specification For This Product Family

Brand Name SP Bel-Art
Color White
Item Shape Polygon
Material Polytetrafluoroethylene
Part Number 371220070
UNSPSC Code 41000000
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Product details

  • Product Dimensions ‏ : ‎ 4 x 3 x 0.75 inches; 0.16 Ounces
  • Item model number ‏ : ‎ 371220025
  • Date First Available ‏ : ‎ November 3, 2009
  • Manufacturer ‏ : ‎ Bel-Art Products
  • ASIN ‏ : ‎ B002VBW6J4
  • Country of Origin ‏ : ‎ USA
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • Best Sellers Rank: #97,878 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
    • #14 in Lab Stirrer Bars
    • #85 in Lab Stirrers

Product Description

Size:1 x 1/4″ (25 x 6 mm) Size:1 x 1/4″ (25 x 6 mm) Plastic container surfaces are less prone to being scratched or marked by the spinning bar. Multifaceted surface transfers more torque to the liquid being stirred when compared to non-faceted cylindrical stir bars of the same size. Features center molded pivot ring for reduced friction and chattering. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.

From the manufacturer

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Magnetic Stirring Bar Selection & Use

Magnetic stirring is used in a number of common laboratory procedures, yet the importance of selecting the best stirring bar for each particular application is often overlooked. The drive magnet, vessel shape, viscosity and abrasiveness of the materials should all be considered when choosing the size, shape and materials (coating and magnet) of the magnetic stirring bar in order to achieve effective, efficient stirring results.

First, let’s discuss magnetism. On the most basic level, we know that opposite poles attract. A magnetic stirrer has a drive magnet, generally a bar or U-shaped made of a metallic alloy or a ceramic which rotates powered by a drive motor. The magnetic poles of the drive magnet are typically about two inches apart in bench top models, and can be up to six inches apart in larger units used to mix 50 gallons of liquid solution. For optimum magnetic coupling the distance between the magnetic poles of the drive magnet and the length of the stirring bar should be equal. Bars too long or too short in proportion to the drive magnet will not have optimum coupling which is important to reduce spin-out.

Once a magnetic stirring bar has been placed in a container with solution, it should be positioned directly over the center of the drive magnet. The stirring speed should be increased slowly, until the desired vortex pattern is achieved. Should the magnetic stirring bar lose its coupling with the drive magnet because of the speed of the drive magnet, viscosity of the fluid, or an improperly selected stirring bar length, it is said to have ‘spun-out’.

Vertical distance between the drive magnet and the stirring bar should be kept to a minimum for the best coupling and stirring efficiency. Therefore, the containing vessel should be as thin as practical.

The selection of the shape of the magnetic stirring bar also influences the resulting vortex in that multi-sided shapes may be more efficient in moving solutions and certain shapes have been designed to provide a tailored fit in specialty vessels such as test tubes, cuvettes and spectrophotometer cells.

Magnetic stirring bars are generally made of ALNICO (an alloy of aluminum, nickel, iron and cobalt) magnets encapsulated in an FDA approved PTFE coating. In addition, magnetic stirring bars also use high energy magnetic materials, such as Samarium Cobalt which increases strength of coupling with a drive magnet and helps to reduce spinout when mixing viscous solutions or mixing at high speeds.

Newer to the market, the Bel-Art Products Spinfinity magnetic stirring bars, use ALNICO magnets encapsulated in plastic for increased durability in granular slurries.

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Polygon Spinbar Magnetic Stirring Bars

Polygon Spinbar Magnetic Stirring Bars

These stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.

  • Center molded pivot ring minimizes the contact area between the bar and the vessel; reduces friction and chattering
  • Marring of plastic containers is diminished
  • Alnico magnet encapsulated in FDA Grade, USP Class VI Teflon PTFE low friction coating; durable and inert
  • Manufactured in a registered ISO 9001:2008, as verified by SGS certification
  • Autoclave safe

SP Bel-Art


7449833242608 , 0191634007920, 7806382247209



Product Dimensions

4 x 3 x 0.75 inches


10 millimeters, 6 millimeters, 8 millimeters




1 x 1-4" (25 x 6 mm), 1-9-16 x5-16" (40 x 8 mm), 2 x5-16" (50 x 8 mm), 2-3-4 x 3-8" (70 x 10 mm), 2-3-8 x 3-8" (60 x 10 mm), 3-4 x 1-4" (20 x 6 mm)


0.160 ounces, 0.705 ounces, 1.06 ounces


25 millimeters, 40 millimeters, 50 millimeters, 70 millimeters

Model Number

371220025, 371220040, 371220050, 371220070

Number of Items


Part Number

371220025, 371220040, 371220070


20120000, 41000000, 41103800, 41120000




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