Cleveland
Cleveland Cobalt M42 Rectangular Tool Bit 856 3/8 x 3/4 in x 4 in
Cobalt M42 rectangular tool bit for lathe work, 3/8 by 3/4 inches by 4 inches overall, non-beveled for right- and left-hand use
- Cobalt M42 steel resists wear in high-speed cuts
- Rectangular blank suits right-hand and left-hand turning
- Non-beveled edges allow immediate shaping to custom profiles
- 4-inch length provides reach for deep boring operations
- Brand Cleveland backs industrial-grade tool-bit consistency
Cobalt M42 Rectangular Tool Bit
The Cleveland Cobalt M42 rectangular tool bit is a lathe tool blank made from high-speed cobalt steel. It suits machinists and fabricators who need a durable blank for custom grinding of turning tools. The M42 grade provides high hot hardness and wear resistance for cutting tough alloys. It is not suited for users needing pre-ground geometry or indexable insert tooling.
3/8 x 3/4 in x 4 in Non-Beveled Blank
The blank measures 3/8 inch wide by 3/4 inch high with an overall length of 4 inches. Its rectangular cross-section and non-beveled profile give a clean starting point for grinding right-hand or left-hand tool shapes. The solid cobalt construction resists deformation under heavy cuts. Builders requiring pre-formed chipbreakers or specific relief angles must grind those features themselves.
Model 856 Cobalt Grade Benefits
The Cobalt M42 material (model 856) delivers superior red hardness compared to standard high-speed steel, extending edge life in high-heat applications. This allows consistent performance when machining stainless steels, titanium, or other abrasive materials. The blank arrives ready for immediate customization on a tool grinder. Shops needing coated inserts or replaceable tips will not find those features here.
Highlights
- Cobalt M42 steel resists wear in high-speed cuts
- Rectangular blank suits right-hand and left-hand turning
- Non-beveled edges allow immediate shaping to custom profiles
- 4-inch length provides reach for deep boring operations
- Brand Cleveland backs industrial-grade tool-bit consistency
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
Does the Cobalt M42 grade 856 tool bit fit a standard 3/8 by 3/4 inch tool holder?
The blank measures 3/8 inch wide by 3/4 inch high so it matches holders cut for that exact cross-section.
What length should I allow for when mounting this 4 inch rectangular bit in my lathe?
Overall length is 4 inches; verify your tool post clamp travel can accommodate that full length before tightening.
Can I grind cutting geometry on both ends of this non-bevelled Cobalt M42 blank?
Yes the bit is right and left hand capable with no factory bevel so you can shape either end as needed.
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