Hole Saw AWTools AW49351BL HSS-Co 8% bimetal 51 mm (Black Line)

AWTools AW49351BL HSS-Co 8% bimetal 51 mm hole saw (Black Line) is a cutting tool designed for creating precise circular openings in metal and a variety of other materials. Constructed from high-speed steel with 8% cobalt, the bimetal design combines wear-resistant cutting teeth with a flexible backing to resist breakage and maintain cutting performance over repeated use. The 51 mm diameter is suitable for standard conduit, pipe and fitting penetrations where a clean edge and accurate diameter are required.

Advantages

The high-speed steel with 8% cobalt composition delivers improved heat resistance and longer life when compared with standard HSS, allowing sustained performance during prolonged cutting tasks. The bimetal construction provides toughness and flexibility, reducing the risk of tooth failure and enabling efficient cutting in thin to moderately thick metals. The saw’s tooth geometry is optimized for clean, burr-minimized holes and consistent cutting speed across various material types.

Suitable for

• Cutting circular holes in steel sheets and non-ferrous metals
• Creating openings for plumbing and HVAC pipes
• Installing electrical conduit and junction boxes
• General metalworking and maintenance tasks requiring accurate hole diameters

Key specifications

• Cutting material: HSS with 8% cobalt (bimetal)
• Nominal diameter: 51 mm
• Design: bimetal hole saw with hardened cutting teeth and flexible body
• Color/line: Black Line finish

How to use

Mark the center point of the desired hole and secure the workpiece to prevent movement. Fit the hole saw onto a compatible arbor and pilot drill as required for guidance. Start drilling at low speed to establish the cut, then increase speed within the recommended range for metal cutting while applying steady, even pressure. Periodically withdraw the saw to clear chips and allow cooling; use cutting fluid when working with thicker or harder metals to extend tool life and improve cut quality. After completing the hole, deburr edges as necessary.

Usage recommendations

Use appropriate safety equipment such as eye protection and gloves. Match drill speed and feed to the material thickness and hardness, and use cutting lubricant on stainless steel or other hard metals to reduce wear and prevent overheating.