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by UPKnife

D4-SS Hardened 440A Stainless Blade

$69.95 $72.90
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available as an UPGRADE KIT

This can be used to UPGRADE or replace a D-Series Blade, notably converting a Red Polymer or Black Al Blade on any Hybrid to the Toughest Blade Available.

Compatible with:

UPK-D1, D2, and D4

Handle Material Comparison (Tensile Strength)

  • 440A Stainless Steel 220+ ksi 
  • Black 7075-T6 Aluminum 70 ksi
  • Red 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

Handle (Only) Kit (uses existing Red Button and Hardware)

  • Hardened 440A Stainless Steel Blade
  • Loctite 243 0.5ml

SS Button Kit (Max Duty)

  • Hardened 450 Stainless Steel Button and is the strongest Button
  • Hardened 440A Stainless Steel Blade
  • Custom Hardened Stainless Steel lock screw
  • Custom Hardened Stainless Steel Shoulder bolts x2
  • Loctite 243 0.5ml

Dash Dispatch

All orders placed before 1pm PST Monday to Friday are typically dispatched same day.

In-Stock orders ship within 1 business day

Back-order items ship in 6 weeks and usually under. Please contact if you have delivery circumtances.

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Satisfaction Guarantee!

You have 30 days from receiving your order to return or exchange it FREE OF CHARGE.

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