Drill Bit Bosch HSS‑Co 135° 12.5 mm x 101 mm

Bosch HSS‑Co 135° 12.5 mm x 101 mm is a high-speed steel cobalt twist drill bit engineered for drilling harder alloys and stainless steels. With a 135° split point geometry and a 12.5 mm cutting diameter, this drill bit provides stable penetration and reduced walking on the workpiece. The 101 mm overall length gives an adequate reach for many workshop and industrial metalworking tasks when used with stationary drilling machines or hand-held drills.

Advantages

This HSS‑Co twist drill bit combines cobalt alloy with high-speed steel to increase heat resistance and wear performance during continuous drilling in tougher materials. The 135° point angle is optimized for reduced thrust force and cleaner entry in stainless steel and other hard metals. The twist flute design efficiently evacuates chips, helping to maintain cutting edge life and consistent hole quality over extended use.

Suitable for

• Drilling stainless steel and heat-resistant alloys
• Metalworking in workshops and industrial settings
• Use with stationary drill presses and hand drills
• Pilot holes and through-holes in sheet and plate metal

Key specifications

• Material: high-speed steel with cobalt alloy (HSS‑Co)
• Point angle: 135°
• Cutting diameter: 12.5 mm
• Overall length: 101 mm
• Tip type: split/centering geometry for reduced walking
• Flute type: spiral twist for chip evacuation

How to use

Secure the workpiece and select an appropriate drill speed for the material being drilled; lower speeds are generally recommended for stainless steel and hard alloys. Clamp the drill bit properly in the chuck and align the 135° point with the intended drilling location. Apply steady, moderate pressure and allow the bit to cut without excessive force. Periodically withdraw the bit to clear chips and, when required, use cutting fluid to reduce heat and improve hole finish. Inspect the hole and the drill bit after use to confirm acceptable wear and hole quality.

Usage recommendations

For best results when drilling stainless steel and heat-resistant alloys, use reduced spindle speeds, adequate cutting fluid, and intermittent pecking to manage heat and chip buildup. Replace the bit once wear degrades cutting performance or hole precision.