Home Shop Walter #27 Cobalt Stub Drill Bit for Stainless Steel
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01J027 - Walter #27 Cobalt Stub Drill Bit for Stainless Steel

Packaging: 10 per each
$5.88/ea

Package Price:

$58.80/10 per each

Usually ships within 3-5 business days

SKU: 01J027 Categories: ,

OVERVIEW

Premium Performance for Industrial Drilling

The Walter 01J027 #27 SST Stub Drill Bit represents the pinnacle of drilling technology for industrial maintenance and fabrication. Designed specifically to address the challenges of drilling hard, high-tensile materials, this bit utilizes a proprietary cobalt blend substrate. Unlike standard High-Speed Steel (HSS) bits, the cobalt composition allows the tool to maintain its hardness at much higher temperatures, a critical factor when working with work-hardening alloys like stainless steel. The "SST" designation refers to Walter's Super Speed Treatment, a bronze surface finish that significantly reduces friction coefficient, allowing for smoother cutting action and cooler operating temperatures.

Engineered for Rigidity

One of the defining features of the 01J027 is its stub, or screw machine, length. By shortening the overall length and the flute length, the bit achieves a much higher degree of structural rigidity compared to standard jobber bits. This reduction in length minimizes deflection and vibration, which are the leading causes of drill bit breakage, especially in portable drilling applications where hand stability can vary. The shorter design also allows for the application of greater feed pressure, enabling the cutting edges to engage the material more aggressively without snapping the tool.

Precision Geometry

Accuracy is paramount in MRO environments. This drill bit features a precision-ground 135° split point. This geometry serves two purposes: it allows the bit to self-center immediately upon contact with the workpiece, eliminating the need for a center punch, and it reduces the thrust load required to penetrate the material. For the #27 size (0.1440 inches), this precision ensures that holes are drilled to exact tolerances every time, making it an indispensable tool for tapping preparation and rivet installation.

Key Technical Benefits

  • Cobalt Blend: Extends tool life in hard metals.
  • Stub Length: Maximizes torque transmission and resistance to snapping.
  • Bronze Surface Treatment: Improves chip flow and reduces heat buildup.
Additional Information
Packaging Description:10 per each
Brand:Walter
Item:Drill Bit
Used to Cut:Steel or Stainless or Aluminum
Material:Cobalt Blend
Drill Size:#27, 0.1440"
Drill Type:Screw Machine Length, Stub
Point Angle:135° Split Point
Surface Treatment:Bronze SST
Flute Design:Short Flute

INCLUDED

  • 1 x Walter #27 SST+ Stub Drill Bit

APPLICATIONS

  • Drilling stainless steel and high-tensile alloys
  • Sheet metal fabrication and bodywork
  • Drilling out spot welds and rivets
  • Portable drilling with hand drills
  • Stationary drill press operations
  • Non-ferrous metal drilling (aluminum, copper)

FAQ

A #27 wire gauge drill bit has a diameter of 0.1440 inches (approximately 3.66 mm).

Stub drills (or screw machine length drills) are shorter, which makes them much more rigid. This rigidity prevents flexing and significantly reduces the chance of the bit breaking, especially when using hand drills on hard materials.

Yes, absolutely. The Walter SST+ line is made from a cobalt blend specifically designed to withstand the high heat and abrasion associated with drilling stainless steel.

Generally, no. The 01J027 features a 135° split point which is self-centering, meaning it will start cutting immediately without walking or skating across the surface.

The bronze SST (Super Speed Treatment) is a surface treatment that helps reduce friction between the bit and the workpiece, allowing for cooler drilling and better chip evacuation.

Yes, the Walter SST stub drill works excellently on non-ferrous metals like aluminum, as well as mild steel and stainless steel.

While exact dimensions vary by size, stub drills have a significantly shorter flute length than jobber drills, maximizing the web strength and minimizing deflection.

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