High Speed Steel Letter Drill Bits - U.S.A.
Consolidated Toledo Magnum Drills
Type 190AQF High Speed Steel
WHY CHOOSE MAGNUM?
Substantially longer cutting life.
The nitro-carburized flute has an increased Rockwell hardness.
Cuts harder materials.
The flatter point takes a smaller chip. More torque is directed to a smaller area. This allows drilling into materials with hardness of over 30 on the Rockwell “C” scale.
Stops drill walking.
The split point design gives accurate starting without the use of a center punch.
Holds tighter hole size.
The split point design is self-centering. This limits the normal oversize drilling characteristics.
Outstanding quality appearance.
The rich amber gold color sets it apart from commodity cutting tools.
Runs cooler, uses less torque.
The 135° point takes a smaller chip resulting in less heat. Friction is reduced by amber gold surface treatment.
MAGNUM SUPER PREMIUM VS. COBALT
The Magnum Super Premium drills will substantially outperform cobalt drills in work hardening stainless steel applications. This performance advantage is the result of construction differences between the two types of drills. Cobalt drills, manufactured to Type J NAS 907 specs, have a very thick web. This web is necessary to limit breakage of the brittle cobalt steel. Magnum Super Premium drills are made of special hi-moly tool steel, which is much tougher than cobalt steel. The web on a Magnum Super Premium drill can be thinned considerably due to the toughness of the steel. A Magnum Super Premium drill with its thin web will penetrate the work hardening stainless fast enough to continually cut beneath the chip which is hardening from deformation. This means the drill is cutting softer steel. The cobalt drill, with its thick web, cannot be fed at a fast-enough rate to cut beneath the area which is hardening. As a result, the cobalt drill is continually drilling into hardened steel.