Silverline 10mm Cobalt HSS Drill Bit 918517

Silverline Cobalt HSS M35 Drill Bit 10mm

Barcode: 5055058112071

MPN: 918517

Overview:

HSS Cobalt Drill Bit 10mm 918517)is a heavy-duty metal drill bit designed for demanding drilling work where standard HSS bits can struggle. Manufactured from M35 high speed steel with 5% cobalt, it offers improved hardness and heat resistance for longer life in tough materials. The 135° split point helps the bit start accurately with reduced wandering, giving cleaner holes and better control—especially on harder metals. Fully ground for consistent cutting performance and finished with an amber coating, this bit is made to DIN338 for reliable quality in trade and DIY toolkits. For best results and longer bit life, use cutting fluid and steady pressure when drilling.

Key Features

• M35 high speed steel with 5% cobalt for improved durability

• 10.0mm diameter for larger clearance and fixing holes

• 135° split point for accurate starts and reduced “walking”

• Fully ground cutting edges for consistent performance

• Amber finish for a professional, hard-wearing coating

• Manufactured to DIN338 standard for reliable sizing and quality

• Ideal for tougher metals where higher heat resistance is needed

Specifications

• Brand: Silverline

• MPN: 918517

• Diameter: 10.0mm 10mm

• Material: M35 HSS with 5% cobalt

• Point Angle: 135° split point

• Finish: Amber

• Standard: DIN338

• Suitable For: Metal drilling (including tougher alloys)

Applications

• Drilling stainless steel and other hard metals

• Cast iron and tougher steel sections

• Workshop fabrication and maintenance drilling

• Site and trade drilling where bit life matters

• General DIY metalwork requiring a clean, accurate 10mm hole

How to Use

• Mark the hole position and centre punch for best accuracy

• Use a slower drill speed for harder metals

• Apply cutting fluid/coolant to reduce heat and extend bit life

• Keep the drill square to the work and use steady pressure

• Clear swarf regularly and allow the bit to cool on deeper holes

Cobalt Drill Bit 10mm – Key FAQs

• What does “cobalt” mean in a drill bit?
  Cobalt alloyed HSS (such as M35 with 5% cobalt) increases heat resistance and hardness, helping the bit last longer when drilling tougher metals.

• Is this suitable for stainless steel?
  Yes, cobalt bits are commonly used for stainless steel. Use cutting fluid and a slower speed for best results and to avoid overheating.

• What is a 135° split point used for?
  It helps the bit start more accurately and reduces wandering on the surface, especially on harder materials.

• Do I need cutting fluid?
  It’s strongly recommended for harder metals. Cutting fluid improves finish, reduces heat and helps extend drill bit life.

• Can I use this bit in a hand drill?
  Yes, provided your drill and chuck can securely hold a 10mm shank/bit and you maintain good control and correct speed.

• Why drill slower on metal?
  Slower speeds reduce heat build-up, helping prevent premature dulling and improving cutting performance.

• What is DIN338?
  DIN338 is a manufacturing standard that helps ensure consistent drill bit dimensions and quality.

• How do I avoid the bit “grabbing” as it breaks through?
  Ease off pressure as you near breakthrough, keep the workpiece clamped securely, and clear swarf regularly for safer drilling.