Home Shop Walter SST+ #28 Cobalt Stub Drill Bit for Stainless Steel
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01J028 - Walter SST+ #28 Cobalt Stub Drill Bit for Stainless Steel

Packaging: 10 per each
$5.32/ea

Package Price:

$53.20/10 per each

Usually ships within 3-5 business days

SKU: 01J028 Categories: ,

OVERVIEW

High-Performance Rigidity for Tough Drilling

The Walter SST+ #28 Stub Drill Bit (01J028) is a premium cutting tool designed to solve the common frustrations of drilling into hard metals and thin gauge sheets. Unlike standard jobber length bits that can flex and wander, this stub drill features a short flute design that maximizes rigidity. This structural stability allows for higher feed pressure without the risk of the bit snapping, making it an indispensable tool for industrial MRO environments where reliability is paramount.

Manufactured from a specialized cobalt blend, the SST+ series is engineered to withstand the intense heat generated when drilling high-tensile materials like stainless steel. The addition of cobalt to the high-speed steel matrix ensures that the cutting edges remain sharp far longer than standard HSS bits. Furthermore, the bit is finished with Walter's exclusive bronze SST surface treatment, which acts as a lubricant to reduce friction and heat buildup, facilitating smoother chip flow and cleaner holes.

Precision is key with the 01J028. It features a 135° split point geometry that bites into the material immediately upon contact. This self-centering action eliminates the need for pre-punching and prevents the bit from "walking" across the surface, which is critical when working with polished stainless steel or rounded surfaces. Whether you are drilling out rivets, working on automotive body panels, or fabricating industrial enclosures, this #28 wire gauge bit delivers consistent, professional results.

Key Technical Benefits

  • Enhanced Durability: Cobalt blend construction resists heat and wear in abrasive materials.
  • Breakage Resistance: Short overall length reduces torque stress and flexing.
  • Precision Starting: 135° split point ensures accurate hole placement without wandering.
Additional Information
Packaging Description:10 per each, 10 per pack
Brand:Walter
Item:Drill Bit
Used to Cut:Steel or Stainless or 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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