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by UPKnife

UPK-D1 Pocket Sai Polished

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Defense Series 

Pocket Sai

Designed from the ground up as an implementation of the Okinawan Sai, a defensive melee weapon that would be practical to carry and sheath itself.  The Handle slides to eclipse the blade's  edges and point, and makes an integrated sheath.  It's one-button locking mechanism is designed to engage at either open or closed position, and must me pressed to unlock it from either end.

 The UPK-D1 Pocket Sai is made in HARDENED STAINLESS STEEL


  • 154CM Stainless steel Blade milled in-house from US sourced material
  • 450 H900 stainless Steel Handle
  • Custom made 450 H900 Stainless steel Hardware(Button and screws)
  • 301 Stainless Steel Springs


Polished Finish - the raw milled heat treated stainless blade and handle are tumbled for radius and comfort and then polished for 48 hours or more as required to achieve a clear luster. This finish requires the most attention but achieves a unique and highly polished surface.

Traditional - The original Okinawan Sai is a defensive melee weapon optimized for non-lethal techniques used by Okinawan police to control and subdue, noting that the saki(point) or yoku(prongs) offer pointed tips that would be used when a more lethal need arose.  I chose to shape the monouchi(main blade) of the Pocket Sai with beveled edges that draw to a point at its end giving it a more ominous look and a more effective tip for its compact size. The bevels enhance a more focused contact pressure on soft targets and provide improved piercing with the saki.  In respect to the traditional Sai, the Pocket Sai is pointed without live edges, this provides better resilience to weapon on weapon impact in melee control techniques.  

Billet Milledfabrication process, from SOLID bar/plate material.  The Blade and handle are milled from a solid piece of Martensitic Stainless Steel, this is the strongest way my designs could be made.


  • Blade Milled from US Sourced 154CM Stainless Steel
    • Heat Treated w/ Cryo HRC 61+/-1HRC
  • Handle made in 450 Stainless Steel 
    • Heat Treated by Age Hardening to the H900 condition HRC 45
  • Custom Hardware(Button and screws) made in 450 Stainless steel
    • Heat Treated by Age Hardening to the H900 condition HRC 45
  • 301 Stainless Steel Springs
    • Cold work Hardened to a Spring Temper


  • Extended length: 11.7 inches (297 mm)
  • Collapsed length: 7.3 inches (186 mm)
  • Weight: 0.5 lb (8 oz.)

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