Alpha Gold Series Metric Drill Set (85 Piece) - SM85
The Alpha SM85 is the ultimate workshop companion for machinists and engineers who require absolute precision. This comprehensive 85-piece set covers the complete metric range from 1.0mm to 13.0mm in ultra-fine 0.1mm increments (plus 0.5mm steps up to 13mm), ensuring you always have the exact size needed for tapping, doweling, or interference fits. Housed in a heavy-duty metal index case, these Gold Series bits are fully ground from M2 High Speed Steel (HSS) and Titanium Nitride (TiN) coated, delivering superior heat resistance and cutting speed in stainless and high-tensile steels.
Features:
Comprehensive 85-Piece Range: Includes every drill size from 1.0mm to 10.0mm in 0.1mm increments, plus 10.5mm to 13.0mm in 0.5mm steps, making it perfect for finding the precise tapping size for any non-standard thread.
Titanium Nitride (TiN) Coating: The gold TiN coating drastically reduces friction and increases surface hardness, resisting heat buildup and extending cutting edge life by up to 3x compared to uncoated bits.
Fully Ground M2 HSS: Manufactured from premium M2 High Speed Steel and fully ground from solid stock, ensuring perfect concentricity and strength for drilling tough materials like stainless steel.
135° Split Point: Features a self-centring 135-degree split point geometry (on sizes 3mm and up) that bites instantly into the material, preventing "walking" and reducing the feed pressure required.
Heavy-Duty Metal Case: Supplied in a robust steel index case with clearly marked size slots, keeping your extensive collection organized and protecting the delicate cutting edges during transport.
Specifications:
Part Number: SM85
Material: M2 HSS (Fully Ground)
Coating: Titanium Nitride (TiN)
Point Angle: 135° Split Point
Range: 1.0mm - 13.0mm
Increments: 0.1mm (1-10mm) / 0.5mm (10.5-13mm)
Important: The use of quality cutting fluid is mandatory when drilling stainless steel to prevent heat buildup and maximize tool life.