D4-Aluminum Blade

$34.95 $51.90

Buy as a Blade ONLY 

*NO Screws Included when purchasing blade ONLY

  • Upgrade a Polymer Composite blade to a stronger more reliable material
  • Lightweight Hardcoat Type III Anodized Handle Great for Every Day Carry.
  • This can be used to replace a D-Series blade.
  • Minimal Guard Pocket Sai removes the Yoku for sleek profile

Compatible with:

UPK-D1, D2, and D4

Blade Material Comparison (Tensile Strength)

  • 440A Stainless Steel 220+ ksi 
  • 7075-T6 Aluminum 74 ksi
  • 50% Glass-filled Nylon 9 ksi


  • Requires Torx T20 Driver to remove screws (Not Included)
  • There are 2 stainless springs located under/inside the Button, maintain pressure on button when loosening the Lock screw,  recommend  opening slowly.
  • Upgrade requires the use of Loctite 243 in all 3 instances of hardware screws and is included

What's Included

Blade Only (existing hardware REQUIRED)

  • Hardcoat Type III Anodized 7075-T6 blade