Microtech Dirac Delta D/E OTF Knife Natural Clear Aluminum, Stonewashed F/S by Tony Marfione (227-D12NC)

Dirac Delta D/E Natural Clear Aluminum, Stonewashed F/S is a larger OTF automatic knife from the Dirac series. It operates in D/A mode and features an incredibly fast blade-ejection mechanism. The slide button is located on the side of the handle. 100% manufactured and assembled in the USA. Designed by Anthony Marfione, a knife maker and owner of Microtech Knives.

Dirac Delta® is an enlarged version of the first OTF D/A (Double Action) automatic knife in the Microtech® lineup, equipped with a slider located in a recess on the side of the handle. This model features a modern, ergonomic handle with curved lines inspired by the iconic HALO® model. The Dirac Delta® series incorporates Microtech®’s signature premium features—patented screws, an innovative internal mechanism, and a functional glass breaker. With a total length of 9.25 inches, the Dirac Delta® is an excellent choice as an everyday carry (EDC) knife.

M390 Microclean® – a high-performance martensitic chromium steel produced using powder metallurgy. Due to its alloy composition, it features exceptionally high wear resistance and excellent corrosion resistance. Thanks to its high wear resistance, it retains its edge shape well, allowing the blade to stay sharp for a very long time (requiring minimal maintenance). Another advantage is its resistance to “wire” formation during sharpening. High-chromium steel 20.0% (Cr) with an alloying content of 1.9% carbon (C) and 4.0% vanadium (V), hardened to a hardness range of 59–61 HRC. This super steel is comparable to Carpenter’s CPM 20CV or CTS-204P steels. Manufactured by Böhler Edelstahl in Kapfenberg, Austria.

Blade - machine-ground D/E (Double Edge) Dagger style, double-edged, serrated along the entire length on both sides, with a long line of reinforcing grooves on both sides of the blade for added strength. Finished with a Stonewashed treatment to mask scratches caused during use. The blade features a high flat grind, ensuring excellent cutting performance. This allows the knife to maintain high durability while offering outstanding piercing capabilities. The centrally positioned fuller further reinforces the blade. The robust blade extension/retraction mechanism, operated by a knurled Thumb Slide, a stepped thumb slider, requires a specific amount of force to overcome the spring resistance for safety. This opening mechanism ensures smooth operation for both right- and left-handed users.

Handle - precision-machined using 3D technology on CNC mills from polished and brushed 6061-T6 aluminum. The handle’s textured surface prevents the knife from slipping in the hand during use. There are notches (jimping) on the back and bottom of the handle for a more secure grip. A distinctive feature is the placement of the slider in a recess milled into the side of the handle. This allows the hand to rest more naturally when opening and closing the knife. The slim profile and the milled, two-position (right/left) solid deep carry clip allow for discreet carrying of the knife in a pocket in the tip-down position (blade tip pointing down). The clip features the Microtech logo, serial number, and date of manufacture. The handle is finished with a glass breaker—a solid steel triangle into which a tungsten carbide ball has been pressed.

Technical Specifications:

Product Number: 227-D12 NC
Product name: Dirac Delta® D/E Natural Clear Aluminum, Stonewashed F/S Standard

Overall length: 235.0 mm / 9.25“
Blade length: 95.2 mm / 3.75”
Blade thickness: 3.0 mm / 0.12"
Handle length: 140.0 mm / 5.5“
Handle thickness: 12.7 mm / 0.5”
Weight: 129.0 g / 4.55 oz

Blade material: Böhler M390
Blade hardness: N/A
Blade grind: Flat
Blade finish: Stonewashed

Handle material: 6061-T6 Aluminum
Handle finish color: Natural Clear
Backspacer material: 6061-T6 Aluminum
Backspacer color: Natural Clear

Clip: Right / Left, Tip-down
Clip material: Stainless Steel

Pivot mechanism: N/A
Lock: Slide Lock
Opening method: Automatic, push/pull thumb slider
Additional accessories: None

Designer: Anthony Marfione
Brand: Microtech
Manufacturer: Microtech Knives
Country of origin: USA

Prepared by: Sharg®