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Greenlee 645-001 cobalt-steel pilot drill bit with 1/4 inch hex shank

Greenlee

Greenlee 645-001 Pilot Drill Bit 1/4 in shank 2 1/2 in overall length

SKU CH-NWNB-M5R3R

Cobalt-steel pilot bit with a 1/4 in hex shank drills aluminum, copper, stainless steel and steel

  • Cobalt-steel construction resists wear on tough metals
  • 1/4 in hex shank fits standard drill chucks
  • 2 1/2 in overall length reaches deeper holes
  • 1/2 in pilot diameter guides larger cutters accurately
  • Suitable for aluminum, copper, stainless steel and steel

Greenlee 645-001 Pilot Drill Bit

The Greenlee 645-001 is a cobalt-steel pilot drill bit with a 1/4 inch hex shank and an overall length of 2 1/2 inches. It is designed for electricians and maintenance technicians who need accurate starter holes before using larger cutters or hole saws in metal.

Hex Shank Limits

The 1/4 inch hex shank fits standard quick-change chucks and impact drivers, but it cannot transmit the torque required for heavy-duty milling or large-diameter drilling. The pilot bit diameter of 1/2 inch restricts its use to starter holes of that specific size only.

Capacity And Headroom

The cobalt-steel construction handles aluminium, copper, stainless steel and steel, maintaining hardness at elevated temperatures. It runs out of reach when the workpiece thickness exceeds the flute length or when a pilot hole larger than 1/2 inch is required.

How it compares

Measured against everything we stock in Bits, Hole Saws & Accessory Kits, at today’s prices. Recalculated every night.

Price $8.99
Cheaper than about 90% of the 5,493 comparable items (median $27.99).

Specifications

Product
Brand nameGREENLEE

Questions about this item

Should I choose the 1/4 inch shank version or a different shank size for my drill?

The 1/4 inch hex shank fits standard drill chucks and quick-change adapters, providing a secure grip for the 1/2 inch cobalt-steel pilot bit when drilling aluminum, copper, stainless steel or steel.

How does the 2 1/2 inch overall length perform when drilling through stainless steel?

The 2 1/2 inch length gives enough reach for typical pilot holes while keeping the cobalt-steel tip rigid, reducing walk on stainless steel and other hard metals.

What does the hex shank interface limit in terms of torque transfer?

The 1/4 inch hex shank transmits torque positively without slipping, letting the cobalt-steel cutting edges work at full pressure on steel and stainless steel.

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