Cleveland
Cleveland Cobalt M42 Square Tool Bit 860 pneumatic accessory
Cobalt M42 square tool bit for lathe turning, 5/8 inch square by 4-1/2 inch length
- Cobalt M42 grade resists heat for longer tool life
- 5/8 in square blank fits standard holders
- 4-1/2 in length provides extended reach
- Non-beveled design allows custom grinding
- Cleveland brand trusted by machinists
Cobalt M42 square tool bit
The Cleveland Cobalt M42 square tool bit is a lathe tool blank made from high-speed cobalt steel. It measures 5/8 inch in overall width and height with an overall length of 4-1/2 inches. The tool features a non-beveled design intended for custom grinding by the machinist.
Machinists shaping custom profiles
This blank suits machinists and toolmakers who need to grind their own cutting geometries for specific turning operations. The M42 cobalt grade provides the hot hardness required for difficult materials. Buyers looking for a ready-to-use indexable insert or a pre-formed tool with a specific chipbreaker will not find that here.
5/8 inch square by 4-1/2 inch length
The 5/8 inch square cross-section provides a rigid mass that handles standard lathe tool holder clamping and resists deflection during moderate cuts. The 4-1/2 inch overall length offers sufficient reach for typical facing and turning setups. The blank runs out when the application demands a pre-ground geometry, a different shank size, or a carbide grade for higher cutting speeds.
Highlights
- Cobalt M42 grade resists heat for longer tool life
- 5/8 in square blank fits standard holders
- 4-1/2 in length provides extended reach
- Non-beveled design allows custom grinding
- Cleveland brand trusted by machinists
Specifications
| Brand | CLEVELAND |
|---|
Questions about this item
What size tool post or holder do I need for the 5/8 in square shank?
The blank is 5/8 in wide by 5/8 in high, so it fits any standard tool post or quick-change holder that accepts a 5/8 in square shank.
Can I grind this M42 cobalt blank on the same bench grinder I use for HSS bits?
Yes, M42 cobalt steel can be ground on conventional aluminium-oxide or silicon-carbide wheels, though it will take longer and wear the wheel faster than HSS.
How do I verify the bit is cutting correctly once I have ground and installed it?
A properly ground edge will produce a continuous, coiled chip and a smooth finish without chatter; if you see built-up edge or vibration, adjust the rake angle or reduce the feed rate.
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