Dormer Drill Bit Long Series 5/16″

818.00

  • Extended Reach With an overall length significantly greater than a standard bit, the Long Series allows you to reach into deep recesses or drill through stacked materials and thick timber/steel sections.

  • Steam Tempered Finish The specialized blue/black surface treatment helps retain cutting fluid at the point of contact and increases the surface’s lubricity, ensuring smoother chip evacuation.

  • High-Speed Steel (HSS) Construction Manufactured from premium HSS to provide a balance of hardness for cutting and toughness to resist the increased torsional stress that comes with a longer bit.

  • 118° Conventional Point The point geometry is designed for strength and easy regrinding. It is highly effective in general-purpose drilling across a wide range of materials.

  • Wide Material Versatility Designed for consistent performance in alloyed and non-alloyed steels, cast iron, and various non-ferrous metals.

  • Standard Compatibility The 7.94mm straight shank fits into all standard 3/8″ (10mm) and 1/2″ (13mm) drill chucks.

Description

The Dormer A110 HSS Long Series 5/16″ is a professional-grade drill bit designed for applications requiring a deeper reach or for drilling through thicker workpieces than a standard “jobber” length bit can accommodate. As a 5/16″ (7.94mm) bit, it is a versatile size frequently used for drilling clearance holes for 5/16″ bolts or as a tap drill for 3/8″-24 UNF (Fine Thread) and M9 x 1.0 metric threads. The A110 series is specifically engineered to maintain rigidity and accuracy even with its extended length. It features a Steam Tempered (black oxide) finish, which is the industrial standard for reducing friction and preventing “cold welding”—where material chips bond to the flutes of the drill.

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