Hertel 66691262 Screw Machine Drill Bit 9/64 in Cobalt

Product Description

The HERTEL 66691262 is a screw machine length drill bit designed for high-speed, high-precision drilling in metal fabrication, machining, and production environments. Built from cobalt steel with a titanium nitride (TiN) coating, this bit handles tough materials including stainless steel, cast iron, and high-alloy steels. The 135-degree split point reduces walking and enables faster penetration without a center punch. At 1-15/16 inches overall length with a 15/16-inch flute, the short body provides rigidity for close-tolerance work in drill presses, CNC machines, and turret lathes. Right-hand spiral flutes clear chips efficiently during operation.

This bit is suited for production machining, metal fabrication shops, and maintenance operations requiring a compact, rigid drill. The screw machine length profile makes it ideal for drill press work where clearance is limited or where stub-length rigidity prevents deflection. It fits standard straight-shank drill chucks with a shank diameter of 0.1406 inches, matching the 9/64-inch body diameter. The heavy-duty grade rating and web-thinned parallel web configuration make it appropriate for repetitive drilling cycles in production settings.

Key Features

• Cobalt steel construction for heat resistance and durability in hard metals
• TiN coating extends cutting edge life and reduces friction
• 135-degree split point reduces thrust and eliminates center-punch requirement
• Web-thinned parallel web lowers cutting resistance
• Screw machine (stub) length provides superior rigidity over jobber-length bits
• Right-hand spiral flute for efficient chip evacuation

Compatibility

Designed as a direct-fit replacement for screw machine length drill bits with a 9/64-inch diameter straight-cylindrical shank, compatible with standard drill chucks accepting 0.1406-inch shank diameters.

Installation Notes

Installation is performed by machinists and tooling technicians. Secure the shank firmly in a keyed or keyless drill chuck before operation and verify runout before beginning a production run. Always wear appropriate eye protection and ensure the workpiece is clamped securely. Do not force the bit through material at excessive feed rates, as cobalt tooling is rigid but brittle under lateral loading.