Hertel 42226 Cobalt Screw Machine Drill Bit 17/32 in

Product Description

The HERTEL 42226 is a screw machine length cobalt drill bit designed for drilling into tough, work-hardening, and high-strength materials in production and maintenance environments. Built from M35 cobalt high-speed steel with an oxide straw finish, it delivers heat resistance and wear life beyond standard HSS tooling. The 135-degree split point reduces walking and thrust at entry, making it well suited for harder substrates. At 3.875 inches overall length with a 2.375-inch spiral flute, this stub-length geometry provides rigidity in applications where standard-length bits would deflect or chatter. Licensed machinists, toolroom technicians, and maintenance mechanics typically reach for cobalt stub drills when production drilling demands consistent hole quality in demanding alloys.

This bit is engineered for use on hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy. The screw machine length body fits standard drill chucks and CNC turret setups where a shorter, stiffer bit reduces runout. The 3xD flute-to-diameter ratio keeps chip evacuation manageable in interrupted or deep-entry passes. It is a single-piece package intended for individual replacement in tool cribs or service kits where one size is needed without committing to a full set.

Key Features

• M35 cobalt steel construction for elevated heat and wear resistance in hard materials
• 135-degree split point reduces thrust and prevents walking on entry
• Oxide straw finish resists built-up edge and aids lubrication retention
• Screw machine (stub) length at 3.875 inches overall for maximum rigidity
• Regular spiral flute geometry with 2.375-inch flute length for efficient chip clearance
• No coolant-through configuration — suited for external flood coolant or cutting oil application

Compatibility

Primary workpiece materials listed by the manufacturer include hardened materials, heat-treatable alloyed steels, stainless steel, and titanium alloy. No specific machine model compatibility is stated in the product data.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill chuck, collet, or turret toolholder sized for a 17/32-inch shank. Secure the bit fully in the holder before operation and verify runout before beginning a production run. Apply appropriate cutting fluid or flood coolant for the workpiece material to manage heat buildup. Inspect the split point and cutting edges for wear before each use, as cobalt tooling subjected to excessive heat can micro-fracture if re-run without inspection.