Irwin 10235 Unibit High Speed Steel Fractional Self-Starting Step Drill Bit #5, 1/4" to 1-3/8", 1/8" Steps, 10 Hole Sizes

Irwin 10235 Unibit High Speed Steel Fractional Self-Starting Step Drill Bit #5, 1/4" to 1-3/8", 1/8" Steps, 10 Hole Sizes

• Irwin 10235 Unibit High Speed Steel Fractional Self-Starting Step Drill Bit #5 drills 10 hole sizes from 1/4 inch to 1-3/8 inches in 1/8 inch steps. The SpeedPoint tip helps start cleanly, and the single flute design supports controlled, round holes in thin sheet materials.
• Features:
  • Hole size range 1/4 inch to 1-3/8 inches with 1/8 inch steps helps cover common hole diameters with one step drill bit.
  • Single flute cutting edge supports controlled cutting through each step for cleaner, rounder holes.
  • SpeedPoint tip supports fast starts and helps reduce walking on the work surface.
  • 7/16 inch hex shank helps reduce slipping in the drill chuck during drilling.
  • Laser-etched hole sizes inside the flute support quick size identification throughout the life of the bit.
  • Tool application step drill bit for drilling multiple hole sizes in thin materials, not a replacement part for another SKU.
• Specifications:
  • Manufacturer: Irwin
  • Part Number: 10235
  • Product Name: Unibit High Speed Steel Fractional Self-Starting Step Drill Bit #5
  • Alternate Part Numbers / Cross References: PE10235
  • Category: Drilling Accessories
  • Subcategory: Metal Drill Bits
  • Product Type / Function: Fractional self-starting step drill bit
  • Nominal Size: #5
  • Hole Size Range: 1/4 inch to 1-3/8 inches
  • Step Increment: 1/8 inch
  • Number of Hole Sizes: 10
  • Hole Sizes: 1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1-1/8 inches, 1-1/4 inches, 1-3/8 inches
  • Material: High speed steel
  • Finish: Bright
  • Number of Flutes: 1
  • Tip Type: SpeedPoint
  • Shank Type: Hex
  • Hex Shank Size: 7/16 inch
  • Maximum Material Thickness: 1/8 inch
  • Applicable Materials: Mild steel, stainless steel, copper, brass, aluminum, plastic, laminates, plexiglass, wood
  • Variants Available: Titanium nitride coated versions are available in the Unibit product line
  • System Compatibility / Application: Designed for drilling multiple hole sizes in thin materials using a drill or drill press that can accept a 7/16 inch hex shank
• The Unibit High Speed Steel Fractional Self-Starting Step Drill Bit #5 can also be referred to as a step drill bit, a fractional step bit, a high speed steel step drill, a self-starting step drill bit, and a 7/16 inch hex shank step bit.

Irwin designs and supplies hand tools and drilling accessories for professional trades and industrial maintenance. The brand is known for jobsite-focused cutting, drilling, gripping, and fastening tool categories distributed through industrial and hardware channels.

Q: What hole sizes does Irwin 10235 drill?
A: It drills 10 hole sizes from 1/4 inch to 1-3/8 inches in 1/8 inch increments: 1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch, 1 inch, 1-1/8 inches, 1-1/4 inches, and 1-3/8 inches.

Q: What drill setup is this step drill bit designed to fit?
A: It uses a 7/16 inch hex shank and is intended for drills or drill presses that can accept the hex shank in the chuck or with a compatible hex adapter.

Q: What materials is it intended for?
A: It is listed for drilling thin materials such as mild steel, stainless steel, copper, brass, aluminum, plastic, laminates, plexiglass, and wood.

Q: Is there a maximum recommended material thickness?
A: Listings for this model specify a maximum material thickness of 1/8 inch for best performance in thin material applications.