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Rectangular high-speed steel tool bit, silver finish

Cleveland

Cleveland HSS M2 Rectangular Tool Bit 851 3/8 x 5/8 in x 4 in

SKU CH-WQ82-GRP0B

High-speed steel rectangular tool bit for lathe work, model 851, measuring 3/8 by 5/8 by 4 inches

  • High-speed steel construction retains hardness at elevated temperatures
  • Rectangular 851 profile fits standard tool holders
  • Four-inch overall length provides extended reach
  • Right- and left-hand orientation supports versatile setups
  • Non-beveled blank allows custom grinding to exact geometry

Cleveland HSS M2 Rectangular Tool Bit 851

This Cleveland high speed steel rectangular tool bit is intended for lathe turning operations where a non-beveled blank is required. Machinists and tool makers can grind custom profiles on the right or left hand faces to suit specific cutting tasks. The 851 designation identifies the grade and shape for workshop identification.

High Speed Steel Grade M2 Wear Resistance

The M2 high speed steel composition provides consistent hardness and red hardness during extended cutting cycles. Heat generated in sustained turning is dissipated through the tool body without rapid loss of edge integrity. The rectangular cross section offers a stable platform for deep or interrupted cuts where thinner blanks might deflect.

Blank Installation and Grinding Considerations

The tool bit mounts in standard tool holders sized for the stated width and height, requiring no special adapters. Care must be taken when grinding relief and rake angles to avoid overheating the M2 steel, which can reduce hardness locally. Non-beveled edges mean the user must establish all geometry from a flat reference surface.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $31.99
Typical for this category: the median of 5,493 items is $27.99.

Specifications

Product
Brand nameCLEVELAND

Questions about this item

Will the M2 high-speed steel run hot enough to lose hardness during a full day of turning?

The blank is made from M2 high-speed steel, which retains its hardness at the temperatures typical of continuous lathe work.

What tool holder or post is needed to clamp the 3/8 by 5/8 inch rectangular shank?

A standard lantern-style tool post or a quick-change holder with a 3/8 by 5/8 inch pocket will secure the blank.

Can the 4 inch overall length be used in a compact benchtop lathe with limited tool-post travel?

The 4 inch length fits most benchtop lathes; verify your tool-post travel and clearance before cutting.

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