UPK-D4 Ringed Hybrid SS-Al

$139.95 $156.00

A minimal guard version of the Pocket Sai. The guards have been reduced to the minimum amount for grip during blade retraction.

 This version of UPK-D4 Bayonet has a Hardened 440A Stainless Steel Blade and a Black Hard-coat 7075-T6 Aluminum Handle 

Hybrid SS-Al (EDC+Thrower) - The combo of a hardened stainless blade with a 7075-T6 Aluminum handle provides a tough throwable Pocket Sai for practice, training, and EDC at a reduced cost. A blade made in 440A high carbon martensitic stainless steel with a hardness of HRC 40-45 makes a tough resilient stainless made for throwing and can take extreme abuse offering bending where harder alloys will break. This combination is a notable upgrade from the SS-Polymer trainer.

Material Specifications:

  • Blade Milled from 440A Stainless Steel
    • Heat Treated to 37-40 HRC
    • 220+ ksi Tensile Strength
  • Handle made in 7075-T6 Aluminum
    • Hard-Coat Anodized Black
    • 70 ksi Tensile Strength
  • Custom Button made in Anodized Aluminum
    • 7075-T6 Aluminum with Black Hardcoat Anodize
  • Custom 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: 12.5 inches (317.3 mm)
  • Collapsed length: 8.1 inches (206.5 mm)
  • Weight: 5.1 oz.