Chicago-latrobe 50915 Cobalt Screw Machine Drill Bit 60

Product Description

The CHICAGO-LATROBE 50915 is a cobalt screw machine length drill bit designed for heavy-duty drilling in ferrous and hard materials. Built to Series 559 specifications, this bit features a 135-degree split point for fast engagement and reduced walking on entry, paired with a web-thinned, parallel-web construction that lowers thrust requirements. At 0.0400 inches (Wire Size 60) diameter with a diameter tolerance of +0.0000 to -0.0005 inches, it holds tight dimensional control for precision hole work. The M42 cobalt steel construction provides heat and wear resistance well beyond standard high-speed steel bits, making it the right choice for production environments and demanding materials.

This bit is suited for drilling cast iron and steel in screw machine, turret lathe, and CNC drilling applications where short, rigid tooling is required. The screw machine length body reduces deflection in close-clearance setups and improves hole straightness in repetitive production runs. The straight-cylindrical shank seats directly in standard drill chucks and collet holders without modification. The right-hand spiral flute geometry clears chips efficiently in both through-hole and blind-hole operations. This SKU is sold individually but requires a minimum order of 12 units.

Key Features

• M42 cobalt construction resists heat buildup during high-speed drilling in steel and cast iron
• 135-degree split point reduces entry thrust and eliminates center-punch requirement on flat stock
• Web-thinned parallel web lowers axial load and extends cutting-edge life
• Screw machine length body increases rigidity and reduces deflection versus jobber-length bits
• Diameter tolerance of +0.0000 to -0.0005 inches delivers consistent, accurate hole sizing
• ISO standard construction ensures dimensional interchangeability with other Series 559 tooling

Compatibility

Designed as an OEM-style replacement and production-use drill bit for applications requiring Wire Size 60 (0.0400 inch) screw machine length tooling in standard drill chucks and collet-style holders.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with rotating cutting tools and machine guarding requirements. Secure the straight-cylindrical shank fully in the chuck or collet before operating. Verify spindle speed and feed rate are appropriate for the workpiece material and bit diameter before engaging the cut. Inspect the cutting edges for wear or chipping before each use and replace the bit if edge integrity is compromised.