Stub Length Drills for Heavy Duty Screw Machine Applications. Rushmore Twist Drills are offered in a pack with sizes 1/16 inch to 1/2 inch. The drill bits are designed for applications where a short rigid drill is recommended. Screw machine bits from Rushmore can drill holes only as deep as their flutes. Each screw drill bit is designed with helical flutes having a 135-degree drill point angle. This construction type goes on to offer enhanced penetration, faster chip ejection and provides stable drilling conditions. The drill bits have a straight shank for easy holding. The drill threads are black or bright finished and available in fractional sizes, number sizes & letter sizes. The base material used to make the drill bit is high-speed steel or cobalt. These screw drill bits are better than Jobber's drill as shallower holes are easily drilled due to the screw bit's inherent shorter lengths. The shorter flute length mitigates deflection, breakage, and runout. The shorter total overall and flute length allows the product to be used in tight spaces and for portable drilling applications that require rigidity. Various stub length twist drills in a pack of 26/29/60/115 pieces are available in a sturdy plastic box. Rushmore's tools are perfect for all aerospace, medical, automotive, or production machining solutions. Travers Tools offers a wide range of Rushmore USA Tools that undergo a strict quality check before they are listed on the product catalog. This USA Made brand offers quality affordable American-made tooling with the superior speed and feed that your applications require.
Applications
Primarily designed for machining operations in screw machines.
Short length offers increased rigidity for machine drilling a variety of materials including steel, cast steel, cast iron, alloyed or non-alloyed ferrous materials, as well as non-ferrous and non-metallic materials.
Use with hand held manual drills, portable or stationary machines.
For optimal performance, use of lubricating/cutting oils or coolant fluids is recommended.