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Scienceware 371100212 PTFE Octagon Spinbar Magnetic Stirrer Bar, with Integral Pivot Ring, White, 2-1/2" Length, 5/16" Diameter

4.6 out of 5 stars 194 customer reviews

Price: $11.00 ($11.00 / Each) & FREE Shipping on orders over $35. Details
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2.5 inches
  • 2.5 inches
0.313 inches
1
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  • Octagonal shape creates more turbulence and a stronger vortex than a round, cylindrical shape or a polygonal 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 FDA approved for use in food, drug, and cosmetic applications

Product Specifications
Part Number 371100212
Material Type PTFE (Polytetrafluoroethylene)
Number of Items 1
Color White
Outside Diameter 0.313  inches
Overall Length 2.5  inches
Shape Cylindrical
Size 2-1/2 x 5/16" (63.5 x 8mm)
Specification for this product family
Brand Name Bel-Art Products
UNSPSC Code 41121802

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$11.00 ($11.00 / Each) & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Scienceware 371100212 PTFE Octagon Spinbar Magnetic Stirrer Bar, with Integral Pivot Ring, White, 2-1/2" Length, 5/16" Diameter
  • +
  • 2000ml / 2L Narrow Mouth Erlenmeyer Flask with Heavy Duty Rim
  • +
  • Thermaltake Mobile Fan II External USB Cooling Fan - Us
Total price: $38.34
Buy the selected items together

Product Description

Item Length String: 2.5 inches | Item Diameter String: 0.313 inches | Number of Items: 1

Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape. Their interrupted profile provides greater surface area and added turbulence when compared to the smooth surface of cylindrical bars. Pivot ring aids in reducing friction and chattering. Coated in white PTFE. Dimensions: 63.5 x 8mm (2-1/2 x 5/16").

From the Manufacturer

Use for General Stirring Applications Use for High Temperature Stirring Applications Use for Viscous Solutions High Speed Stirring Use for Abrasive Slurries Extended Stirring Applications
Brand / Type Spinbar Teflon PTFE Spinbar Pyrex Glass Spinbar Rare Earth Samarium Cobalt Spinfinity
Magnetic Type Alnico Alnico Samarium Cobalt Alnico
Covering Teflon PTFE Clear Pyrex Glass Teflon PTFE Plastic
Features / Benefits Wide selection of shapes and sizes to fit vessels of all types; Individual shapes create different vortexes for efficient and effective stirring Heated stirring applications up to 274°C (525°F) Reliable Magnetic Coupling – Superior magnetic energy reduces frequency of spinout in the most vigorous applications Durable – Last 2.5 to 3 times longer under conditions known to traditionally cause material breakdown
FDA grade Teflon PTFE low friction coating is durable and inert Glass casing has zero absorption and porosity FDA Grade Teflon PTFE low friction coating is durable and inert Outer shell made from FDA approved materials
Color selection for color-coding work processes Distinct Color – Green color lets you quickly identify Spinbar Rare Earth Samarium Cobalt Distinct Color – Quickly identify the Spinfinity difference by its purple color
F37110-1218 *No Pivot Ring F37110-1256 F37110-1238 F37110-0058 F37110-5838 F37110-0078
Size ½ x ⅛” (12.7 x 3.2mm) *No Pivot Ring ½ x ⁵/₁₆” (12.7 x 8mm) ½ x ⅜” (12.7 x 9.5mm) ⅝ x ⁵/₁₆” (15.9 x 8mm) ⅝ x ⅜” (15.9 x 9.5mm) ⅞ x ⁵/₁₆” (22.2 x 8mm)
F37110-7838 F37110-0001 F37110-0138 F37110-0118 F37110-1388
Size ⅞ x ⅜” (22.2 x 9.5mm) 1 x ⁵/₁₆” (25.4 x 8mm) 1 x ⅜” (25.4 x 9.5mm) 1⅛ x ⁵/₁₆” (28.6 x 8mm) 1⅜ x ⅜” (34.9 x 9.5mm)
F37110-0112 F37110-1128 F37110-1122 F37110-0158 F37110-0178 F37110-0002
Size 1½ x ⁵/₁₆” (38.1 x 8mm) 1½ x ⅜” (38.1 x 9.5mm) 1½ x ½” (38.1 x 12.7mm) 1⅝ x ⁵/₁₆” (41.3 x 8mm) 1⅞ x ⅜” (47.6 x 9.5mm) 2 x ⁵/₁₆” (50.8 x 8mm)
F37110-0238 F37110-0212 F37110-2128 F37110-0003
Size 2 x ⅜” (50.8 x 9.5mm) 2½ x ⁵/₁₆” (63.5 x 8mm) 2½ x ⅜” (63.5 x 9.5mm) 3 x ½” (76.2 x 12.7mm)

Product Details

Item Length String: 2.5 inches | Item Diameter String: 0.313 inches | Number of Items: 1
  • Shipping Weight: 4 ounces (View shipping rates and policies)
  • 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
  • ASIN: B002VBW5IQ
  • Item model number: 371100212
  • Average Customer Review: 4.6 out of 5 stars 194 customer reviews
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Customer Reviews

Top Customer Reviews

Outside Diameter: 0.313Number of Items: 1Overall Length: 1.5 Verified Purchase
As a homebrewer with a DIY stir plate the size of this stir bar is slightly larger than ideal with a 2000mL flask. The vortex is too large. It works, maybe too well. The pivot ring really allows this bar to get going. If I had it to do again I would get the 1" bar for my CPU fan 12w stir plate.
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Outside Diameter: 0.375Number of Items: 1Overall Length: 1 Verified Purchase
It's a magnetic stir bar that said it was 1". Good news, it's magnetic and it is indeed 1".
The bar certainly gets the starter going quickly but as others have noted, the center rivet makes a clinking sound that will go on for as long as you have the stir plate on. I am not sure if this design had anything to do with the nice vortex I got with my stir plate on the lowest speed, but it certainly does make the noise people wrote about. It doesn't bug me but I will likely find a replacement just in case I lose this one and compare the two. I can't knock off a star just because I am unsure of something.

My stir plate is variable speed because my computer fan (80mm) is 6v and my power source is 9v allowing me to change speeds using a rheostat.
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Outside Diameter: 0.313Number of Items: 1Overall Length: 1 Verified Purchase
I had purchased a similar bar at my local home brewing store, but it turned out that it was too long (about 2") to work with the magnet I had dug out of an old hard drive to construct my own stir plate. This one is right at an inch and works great with the magnet which is also about an inch long. Super simple to build a super cheap workable stir plate for my yeast starters - Old PC Fan, Magnet from Hard Drive, an old multi-voltage power brick, plus this stir rod! Bottom line pick a stir rod that matches the distance between the north/south poles on your magnet.
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Outside Diameter: 0.313Number of Items: 1Overall Length: 1.5 Verified Purchase
Great all around size and cheap price doesn't hurt. In my experience this one creates a huge vortex and the center rotation point helps increase speed with less resistance and allows me to churn the liquid for greater aeration of liquids. At lower speeds I get great rotation at what seems to be less overall power consumption.
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Outside Diameter: 0.313Number of Items: 1Overall Length: 1.5 Verified Purchase
Works well for making yeast starters for homebrew, but it is loud due to the center ring. The ring acts as a pivot point and it constantly "tinks" on the bottom of the flask. As one other reviewer mentioned, it is a stir bar and it stirs as intended, but I will likely try and find one without the center ring. The noise is the reason for the rather than 5 stars. This is an item that is impossible to find locally for me.
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By anonymous on October 18, 2011
Outside Diameter: 0.313Number of Items: 1Overall Length: 1.5 Verified Purchase
It spins in a circle as advertised. Not sure what else you want from a piece of metal wrapped in teflon.
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Outside Diameter: 0.313Number of Items: 1Overall Length: 1 Verified Purchase
I was a little confused on the length. It's 1 inch long by 5/16 wide, I missed the 'X' in the description and thought it was 1 & 5/16 inches long. But it works perfectly in my 1 liter flask when making yeast starters for brewing.
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Outside Diameter: 0.375Number of Items: 1Overall Length: 1 Verified Purchase
Works flawlessly! Stirs 2 liters easily on my homemade stir plate. Home brewers, youtube homemade stir-plates, you can make your own out of that old PC you refuse to toss out! Magnets from the hard drive, wire from the wiring harness, one of the cooling fans can be used as the motor, the power supply housing can be used as the body, the on off switch from the power supply will operate the unit and an AC Adapter/charger from one of your old, unused cell phone will power the whole thing. 1 hour and you have the stir-plate built!
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Scienceware 371100212 PTFE Octagon Spinbar Magnetic Stirrer Bar, with Integral Pivot Ring, White, 2-1/2" Length, 5/16" Diameter
This item: Scienceware 371100212 PTFE Octagon Spinbar Magnetic Stirrer Bar, with Integral Pivot Ring, White, 2-1/2" Length, 5/16" Diameter
Price: $11.00
Ships from and sold by Amazon.com