AIRCRAFT EXTENSION LENGTH
Cobalt Aircraft Extension Drills are heavy duty Jobber Flute Length Drills with an extended overall length of 6", 12" or 18". For portable or machine drilling in stainless steel, titanium, and other work hardening metals. Manufactured to NAS 907-J specs.
Aircraft Extension Drills - Cobalt3/64" to 3/4"#1 to #52A to Z2mm to 12.5mm
Cobalt Aircraft Type "D" Jobber Length Drills with screw machine length flute are designed to handle high thrust
loads when drilling through high tensile and heat resistant alloy steels. Its heavy web design provides a more rigid tool for accurate holes elimating vibration and flexing. Ideal for portable drilling.
Type "D" - #1 to #40
Cobalt Jobber Length Drills are the most common size of drill. Thicker web construction for extended drill life. Relief ground and twist fluted for maximum strength and rigidity. For portable or machine drilling in stainless
steel, titanium, and other work hardening
metals. Manufactured to NAS 907-J specs.
Jobber Length Drills - Cobalt1/64" to 11/16"#1 to #80A to Z1mm to 8.4mm8.5mm to 13mm
Jobber Length Drills - 3/8" Reduced Shank - Cobalt25/64" to 11/16"10mm to 13mmJobber Length Drills - 3 Flats on Shank - Cobalt3/16" to 1/2"
SCREW MACHINE LENGTH
Cobalt Screw Machine Length Drills were originally developed for screw machine operations where regular length drills were too long. The short length design reduces breakage and runout. They are now used in portable drilling where short, rigid drills are a requirement and are especially suitable for N/C drilling applications. Cobalt composition is used for drilling in tough alloys, stainless steel, titanium inconel and other work hardening metals.
Screw Machine Length Drills - Cobalt3/64" to 1"#1 to #60A to Z
SILVER & DEMING
Cobalt Silver and Deming Drills are used wherever the maximum chuck capacity is 1/2". For portable or machine drilling in hard steels, stainless steels and other hard materials. The split point is self centering and breaks up chips. Sizes over 1" are 118° split point.They are also called S&D Drills, Blacksmith Drills or Prentice Drills (Canada). All Silver and Deming Drills are 6" overall length with 3" flute length.
Silver and Deming Drills - Cobalt33/64" to 1-1/2"
Silver and Deming Drills - 3 Flats on Shank - Cobalt
Flats are ground on three sides of drill shank for positive holding in 3 Jaw Chucks.
33/64" to 1-1/2"
Cobalt Taper Length Drills are drills with increased cutting length. They are manufactured with straight shanks of the same diameter as that of the flute diameter. Taper length drills derive their name from having the same flute length as taper shank drills. In Europe, these drills are known as Long Series Drills or Long Jobber Drills. Cobalt composition is used for drilling in tough alloys, stainless steel, titanium inconel and other work hardening metals.
Taper Length Drills - Cobalt1/16" to 1"#1 to #60A to Z
Taper Shank Drills - Cobalt1/4" to 2"
THREADED SHANK ADAPTER
Cobalt Threaded Shank Adapter Drills are used for heavy duty drilling in hard, tough tensile strength materials in confined areas. They are manufactured with true concentricity for more accurate holes. They are often referred to as Snake Drills.
Threaded Shank Adapter Drills - Cobalt#2 to #403/32 to 1/4D and F