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Product Overview

Cobalt Jobber-Length Drills

Jobber-length drills are the most common, general-purpose drills. They feature a long length compared to their diameter, and offer a good balance of strength and accuracy for drilling in a wide range of materials. Available in fractional, letter, number, and metric sizes.

 

These drills are constructed of 8% cobalt high-speed steel (HSSCo8), which is harder than standard high-speed steel (HSS), and provides better wear resistance and higher hardness. They feature a 135° split point* and 30° flute helix, and are suitable for drilling steel and stainless steel, with secondary applications in cast iron, aluminum, and high-temp alloys. The TiN (Titanium Nitride) coating adds lubricity, and increases hardness and heat resistance, allowing these drills to run at higher speeds and feeds than HSS.

 

Cobalt drills are less expensive than carbide, are less prone to chipping, and may be resharpened to extend their life.

 

NOTE: A spot drill is recommended to ensure accurate hole locations.

 

* Normal point below 1/16" (1.6mm).

DON’T FORGET ABOUT OUR SPOT DRILLS

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Video Guide

Do You Use Drills? Watch This Video to Decode Drill Indexes and Charts

Whether you call it a Drill Index, a Drill Set, or a Drill Kit, every machinist is familiar with that box full of drills that should have all the sizes your jobs require. Mark breaks down the mysteries behind the various drill sizing conventions and shows why it's time for an updated drill chart that makes better choices for tap drill sizes and uses all of the drill sizes that are readily available today.

Basics of Drill Selection - Haas University

In the inaugural episode of Haas University (Haas U), Manufacturing Engineer Andrew Harnett guides you through the basics of selecting the proper twist drill. You'll learn about the pros and cons of choosing high-speed steel, cobalt, and carbide, as well as advice on coatings, drill point and flute geometry, and more. How many times have you just grabbed the closest drill without really knowing if it's the right tool for the job? After watching this video that should hopefully be less of a problem!

Don't Waste Cycle Time; Peck Drilling Essentials - Haas Automation Tip of the Day

You are wasting valuable cycle time and not even realizing it! In today's episode, Mark explains how the peck drilling cycle you are most likely using is adding time to your programs. Using Q values is costing you money, learn how to properly use I-J-K values instead. This is one of those tips you will use in your shop literally every day, don't miss it.