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08B450 - Walter HP 4-1/2 Inch Spin-On Grinding Wheel Type 27

Packaging: 20 in a box
$9.02/ea $114.60/20 in a box only $5.73/eaSave 36%

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OVERVIEW

Grind Welds Faster with the Walter HP Spin-On Wheel

When you are in the middle of a tough job, the last thing you want to do is fight with your grinder. The Walter HP "Spin-On" Grinding Wheel (08-B-450) is built for welders who need to remove metal fast and keep moving. This isn't just another generic grinding disc; it's a high-performance tool designed to bite into steel and smooth out welds with way less effort than you're used to. If you've ever leaned into a grinder only to have the wheel bounce or glaze over, you'll appreciate the aggressive, controlled feel of this Walter wheel.

The game-changer here is the Spin-On hub. Forget hunting for your pin wrench or busting your knuckles trying to loosen a jammed flange nut. This wheel comes with a built-in 5/8-11 threaded hub that spins right onto your 4-1/2 inch angle grinder. When you're done, it spins right off. It’s simple, fast, and keeps you grinding instead of wrenching. This feature alone saves you frustration and time, especially when you're swapping wheels multiple times a day.

Performance-wise, the "HP" in the name implies High Performance, and it lives up to it. This wheel is formulated specifically for steel, meaning it eats through weld beads, slag, and heavy stock without bogging down. It’s 1/4-inch thick, giving you plenty of abrasive material to work with, and it lasts a long time even under heavy pressure. The Type 27 depressed center shape lets you get in at the right angle for smoothing out butt welds or cleaning up fillets.

Comfort matters when you're grinding all day. The Walter HP wheel is balanced to run smooth, reducing the vibration that leaves your hands tingling at the end of a shift. It grinds cool and fast, helping you produce a professional finish on your metalwork. Whether you are prepping a joint or finishing a heavy fabrication project, the Walter 08-B-450 is the reliable, heavy-duty partner you need in your shop.

Additional Information
Diameter:4.5"
Thickness:0.25"
Arbor (in):5/8"
Used To Grind:Steel
Brand:Walter Surface Technologies
Wheel Style:Type 27
Grit:24
Mounting Type:Spin-On 5/8-11
Bond Type:HPS
Country Of Manufacture:Italy
Packaging Description:20 in a box

INCLUDED

  • 1 x Walter HP Spin-On Grinding Wheel (4-1/2" x 1/4" x 5/8-11)

APPLICATIONS

  • Heavy weld grinding and blending on steel structures
  • Deburring cut edges and flame-cut parts
  • Surface preparation and shaping of carbon steel
  • Beveling plates prior to welding
  • General fabrication and maintenance repair operations

FAQ

The Spin-On feature refers to the integrated 5/8-11 threaded hub built into the center of the grinding wheel. This allows you to screw the wheel directly onto the spindle of your angle grinder by hand, eliminating the need for a separate flange nut or pin wrench.

The Walter HP 08-B-450 is primarily formulated for use on steel (carbon steel). While it can physically grind other metals, using it on stainless steel may lead to contamination or less efficient cutting compared to a wheel specifically designed for stainless applications.

While the specific RPM should always be verified on the wheel's label, standard 4-1/2 inch grinding wheels are typically rated for approximately 13,300 RPM. Always ensure your grinder's speed does not exceed the rating printed on the wheel.

No, this is a Type 27 grinding wheel with a 1/4-inch thickness. It is designed for grinding, shaping, and stock removal. It should not be used for cutting (cutoff) operations, as the side load forces during cutting are different from grinding forces.

This wheel features an A-24 grit rating (A24HPS), which is a coarse grit ideal for aggressive material removal and heavy grinding tasks.

It fits 4-1/2 inch angle grinders that have a standard 5/8-11 threaded spindle. This is the most common spindle size for North American grinders, but you should verify your tool's spindle size before purchasing.

These wheels are often sold individually, but they are manufactured in packs of 20. Please check the specific quantity selector on the product page to confirm if you are buying a single unit or a box.

The Type 27 'depressed center' shape allows the locking nut (or in this case, the built-in hub) to sit recessed, permitting grinding at a 15 to 30-degree angle without the mounting hardware interfering with the work surface.

CATALOGUE & SPEC SHEETS

Spec Sheet
Safety Data Sheet
Google Rating
4.9
Based on35reviews
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