Cleveland Golf Jobber Drill 10.5mm Cobalt 135 Deg NAS

Jobber Drill 10.5mm Cobalt NAS 907

This 10.5mm cobalt jobber drill meets National Aerospace Standards 907 Type J for heavy-duty applications. The split-point geometry at 135 degrees starts on contact and reduces walking on hard materials. It is suited for professional workshops and aerospace maintenance where NAS compliance is required.

135-degree split point limits

The 135-degree split point centres itself without a pilot hole, yet the cobalt substrate still demands rigid setups and controlled feed rates to avoid chipping. Right-hand spiral flutes evacuate chips efficiently in through-holes up to 87.00mm deep, but the tool lacks internal coolant channels for deep blind holes. Users must supply external flood or mist coolant when drilling stainless or high-temperature alloys.

Straw bronze finish and straight shank

The straw-bronze surface treatment identifies the cobalt grade and provides modest lubricity during break-in. A 10.50mm straight shank fits standard three-jaw chucks and collets without reducing shank diameter, so the full 133.00mm overall length is available for reach. The heavy-duty web resists deflection in tough alloys, but the absence of a whistle-notch flat means the drill cannot be secured in weldon-style holders.