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Walter SST+ #28 Cobalt Stub Drill Bit for Stainless Steel

$5.32/ea $46.70/10 per each only $4.67/eaSave 12%

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OVERVIEW

The Welder's Choice for Stainless Steel Drilling

When you are fabricating with stainless steel or working on intricate sheet metal projects, a broken drill bit can ruin your day and your workpiece. The Walter SST+ #28 Cobalt Stub Drill Bit is built to handle the abuse that standard bits can't. Known in the industry as a "stub" or "screw machine" drill, its shorter profile provides exceptional strength and stability. This means you can apply the pressure needed to cut through hardened alloys without worrying about the bit flexing or snapping off in the hole.

This #28 drill bit is specifically formulated with a high-performance cobalt blend, making it the ideal companion for welders working with stainless steel, mild steel, and non-ferrous metals. The heat resistance of cobalt prevents the tip from burning up, ensuring you get more holes per bit and less downtime changing out dull tools. The unique bronze surface treatment further enhances performance by reducing friction, allowing the bit to cut freely and eject chips efficiently.

Perfect for drilling out spot welds or creating pilot holes for fasteners, the Walter SST+ features a 135-degree split point. This aggressive tip geometry centers itself instantly, preventing the dreaded "skating" that scratches pristine metal surfaces. For automotive repair, HVAC fabrication, or general metalworking, the Walter 01J028 offers the reliability and precision professional welders demand. Stop wasting money on cheap bits that break; upgrade to the rigidity and performance of Walter SST+.

Recommended Applications

  • Drilling rivet holes in sheet metal.
  • Fabricating stainless steel countertops and enclosures.
  • Automotive body work and spot weld removal.
  • General maintenance and repair on hard alloys.
Additional Information
Brand:Walter Surface Technologies
Item:Drill Bit
Packaging Description:10 per pack
Used To Cut:Steel, Stainless Steel & Aluminum
Drill Size:#28
Material:Cobalt Blend
Point Angle:135° Split Point
Flute Type:Stub Length
Coating:Bronze SST

INCLUDED

  • One (1) Walter SST+ #28 Cobalt Stub Drill Bit

APPLICATIONS

  • Drilling stainless steel sheets and plates
  • Automotive body panel repair
  • Drilling out rivets and spot welds
  • General fabrication with mild steel
  • Non-ferrous metal drilling (aluminum, copper)
  • Portable hand drilling where rigidity is required

FAQ

A stub drill (or screw machine drill) has a shorter flute and overall length compared to a standard jobber drill. This makes the stub drill much more rigid and less prone to breaking, which is ideal for drilling hard materials or using portable hand drills.

A #28 wire gauge drill bit has a diameter of approximately 0.1405 inches (3.57 mm).

Yes, the Walter SST+ series is specifically designed with a cobalt blend to withstand the heat and hardness of stainless steel drilling.

Generally, no. The 135° split point design allows the bit to self-center immediately upon contact, preventing walking and reducing the need for center punching.

The bronze SST treatment acts as a surface lubricant that reduces friction between the bit and the workpiece, helping to lower heat generation and improve chip evacuation.

Yes, the Walter SST+ drill bits are effective on non-ferrous metals like aluminum, though their primary advantage is found in harder metals like stainless steel.

Sheet metal often vibrates during drilling. The shorter length of a stub drill provides better stability and control, producing rounder, cleaner holes without grabbing the material as aggressively.

When drilling stainless steel, it is generally recommended to use a slower RPM and higher feed pressure to prevent work-hardening the material. The cobalt construction of this bit aids in this process.
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