Jobber Length Bits for Drilling Metals

RUKO Jobber Length Drill Bits

These high-performance twist drill bits are available in three different materials and are suitable for all normal drilling in conventional materials.

Features

• The HSS ground twist drill bit is made of heavy-duty high-speed steel.
• The fully ground twist drill bit has a more precise concentricity.
• HSS-Co drills are ideally suited for materials that are especially difficult to drill such as stainless steel and for higher chip loading.
• HSS-TiN drill bit models add a titanium nitride coating that increases the surface hardness to approximately 2300 HV and the heat resistance to 1100°F (600°C), resulting in longer tool life with increased cutting speeds.
• Point Cut: 1/8" dia. with split point DIN 1412 C
• Point angle: 118°
• Helix angle: 20° to 30°
• Right-hand cutting

Applications

Use HSS, HSS-Co and HSS-TiN coated drills for:

• Steel and stainless steel
• Alloyed and unalloyed cast iron (up to strength of 13,000 psi)
• Grey, malleable, ductile and die-cast iron
• Sintered iron, nickel silver, graphite
• Short chipping aluminum alloys
• Brass and bronze

Black & Gold Jobber Length Drill Bits

These high-performance twist drills are suitable for all normal drilling in conventional materials. High Speed Steel bits with 5% Cobalt alloy (HSS-Co5) and a black oxide surface treatment on the bevel decreases cutting forces and increases wear resistance of the bit.

• Point Cut: from 1/16" dia. with split point
• DIN 1412 C
• Shank: 5/32 and larger, three-surface shank
• Point angle: 135°
• Helix angle: 40°
• Right hand cutting