Jobber Length Drills

Jobber length drills are versatile drill bits used in commercial metalworking, machining, maintenance, fabrication, and everyday shop drilling. The selection includes cobalt bits for hard and extremely hard metals, including stainless steel, as well as a black oxide bit for common steel, wood, and plastic. Many options use a 135° self-centering or Quick-Cut point to support accurate hole starts with less pressure.

Product Display:
Helpful Buying Guide

Choose Jobber Length Drills for the Material and Hole Size

Start with the material you need to drill, then match the drill diameter and listed length to the task. The products represented here range from small 3/32-inch cobalt bits to a 3/8-inch cobalt bit, with a black oxide option for common steel, wood, and plastic. A set-screw adapter is also available for using compatible modified 1/4-inch shank twist drills in a magnetic drill.

Visual Guide

Popular examples in this category

Cobalt Jobber Drill Bit, 3/16 in. x 3-1/2 in., 135° PointCobalt Jobber Drill Bit, 3/16 in. x 3-1/2 in., 135° PointWBB2139887M35 Cobalt Jobber Drill Bit, 15/64 in. x 3-7/8 in., 135° PointM35 Cobalt Jobber Drill Bit, 15/64 in. x 3-7/8 in., 135° PointWBB2139782Cobalt Jobber Drill Bit, 11/64 in. x 3-1/4 in., 135° PointCobalt Jobber Drill Bit, 11/64 in. x 3-1/4 in., 135° PointWBB2139797M35 Cobalt Jobber Drill Bit, 17/64 in. x 4-1/8 in., 135° PointM35 Cobalt Jobber Drill Bit, 17/64 in. x 4-1/8 in., 135° PointWBB2139810
Use Cases

Drill hard metals and everyday materials

Choose M35 cobalt jobber drills for hard or extremely hard metals, including stainless steel. Choose the black oxide M2 high-speed steel bit for common steel, wood, and plastic.

How to Choose

Match material, diameter, and equipment

Select cobalt or black oxide construction based on the work material, choose the required hole diameter, and review the listed bit length. Some cobalt options list 1,500 RPM or higher as guidance for maximum efficiency.

Applications

Support shop and maintenance work

These drills are suited to machining, metalworking, fabrication, maintenance, and general shop tasks. Their self-centering points help control the start of a hole.

Additional Information

Consider the magnetic-drill adapter

For a magnetic-drill setup, the set-screw adapter supports compatible modified 1/4-inch flattened-shank twist drills. It installs on the arbor without removing the existing arbor or coolant system.

135°Point angle

Listed drill bits use self-centering or Quick-Cut 135° points.

3/32–3/8 in.Cobalt diameter range

Represented cobalt drill diameters run from 3/32 inch through 3/8 inch.

1,500 RPMOperating guidance

Several cobalt options list 1,500 RPM or higher for maximum efficiency.

1 eachMinimum order

Several listed products, including the adapter, have a minimum order quantity of one.

Comparison Guide

Compare the Available Drill Types and Accessory

Use the work material and equipment setup to narrow the selection.

Product TypeBest-Fit Materials or SetupKey Selection Details
M35 cobalt jobber drill bitsHard and extremely hard metals, including stainless steel135° self-centering or Quick-Cut points; listed diameters from 3/32 to 3/8 inch
Black oxide jobber drill bitCommon steel, wood, and plasticM2 high-speed steel; black oxide treatment; 3/16-inch diameter
Set-screw drill adapterMagnetic drills using compatible modified twist drillsFor compatible 1/4-inch flattened-shank twist drills; set-screw retention
Planning Guide

Plan the right fit before choosing

Material Selection

Choose cobalt for demanding metal drilling

M35 cobalt steel bits are represented for drilling hard and extremely hard metals, including stainless steel. Their heat-resistant designs support demanding metal-drilling applications. For common steel, wood, and plastic, the black oxide jobber drill offers M2 high-speed steel construction and black oxide treatment.

  • M35 cobalt steel for hard metals, including stainless steel
  • Heat-resistant designs on listed cobalt bits
  • M2 high-speed steel black oxide option for common steel, wood, and plastic
Point and Hole Start

Use a 135° point for controlled starts

The drill bits shown feature 135° self-centering or Quick-Cut points. These point designs help reduce wandering or walking, start holes with less pressure, and can eliminate the need for a center punch on listed cobalt options.

  • 135° self-centering and Quick-Cut point designs
  • Reduced starting pressure for listed products
  • Accurate starts without a center punch on applicable cobalt bits
Size and Setup Planning

Confirm diameter, length, and drill compatibility

Available listed cobalt sizes include 3/32, 7/64, 1/8, 9/64, 11/64, 3/16, 7/32, 15/64, 17/64, and 3/8 inch. Confirm the needed hole size and the listed overall length before choosing. For magnetic-drill work, verify that the twist drill has a compatible modified 1/4-inch flattened shank before selecting the adapter.

  • Cobalt diameters span 3/32 inch through 3/8 inch in the represented products
  • Listed bit lengths range from 2-1/4 inches to 5 inches
  • Adapter is for compatible modified 1/4-inch flattened-shank twist drills
FAQ

Common questions before buying

What materials are cobalt jobber drills designed to drill?

The represented M35 cobalt drill bits are designed for hard and extremely hard metals, including stainless steel.

What is the black oxide jobber drill bit used for?

The black oxide M2 high-speed steel bit is designed for common steel, wood, and plastic.

Why choose a 135° self-centering or Quick-Cut point?

These points help start holes accurately with less pressure and reduce walking or wandering. Listed cobalt options may start without a center punch.

What does the drill adapter work with?

The adapter supports compatible modified 1/4-inch flattened-shank twist drills for use in a magnetic drill.

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