Precision Twist Drill 5995585 Cobalt Drill Bit Set 26pc

Product Description

The PRECISION TWIST DRILL 5995585 is a 26-piece cobalt screw machine length drill bit set covering the full letter series from A through Z. Built from M42 cobalt high-speed steel with a gold finish, these bits are engineered for heavy-duty metalworking applications where standard HSS tooling wears prematurely. The 135-degree split-point tip reduces walking on entry and requires no center punch on most metal surfaces. Straight shanks provide secure chuck retention, and screw machine length geometry offers added rigidity compared to jobber-length bits. The set arrives in a metal storage case indexed for the full A-through-Z range.

This set is suited for metalworking and multipurpose drilling tasks in production, maintenance, and repair environments. Screw machine length bits are a common choice when working in confined spaces or on drill presses where shorter flute length improves rigidity and reduces deflection. Typical users include machinists, maintenance mechanics, pipefitters, and general contractors drilling ferrous and non-ferrous metals, stainless steel, and hard alloys. The cobalt construction makes this set appropriate where titanium-coated HSS bits have proven insufficient.

Key Features

• M42 cobalt tool material for extended life in hard and abrasive metals
• 135-degree split-point tip reduces entry walking and thrust force
• Gold finish provides a visual wear indicator during use
• Screw machine length design increases rigidity and reduces deflection
• Full letter series A through Z — 26 pieces total
• ANSI-compliant specification; straight shank fits standard keyed and keyless chucks
• Metal indexed storage case keeps bits organized and protected

Compatibility

Designed for use in standard drill presses, hand drills, and CNC machines accepting straight-shank bits across the full letter-size range A through Z. Intended for metalworking and multipurpose drilling in inch-measurement applications conforming to ANSI standards.

Installation Notes

Installation is performed by machinists or maintenance professionals familiar with metalworking drill operations. Secure the shank fully in the chuck before operation and confirm the spindle is locked before changing bits. Use appropriate cutting fluid when drilling hard metals or stainless steel to extend bit life and manage heat. Inspect bits for chipping or heat discoloration before each use, as cobalt bits subjected to excessive heat may lose temper and should be removed from service.