SOG XR Lock Knives

SOG’s XR Lock is a crossbar mechanism—a steel bar that passes through the blade tang and locks under spring tension. SOG rates the system to withstand 1,500 pounds of spine pressure. The lock is fully ambidextrous, and every XR folder ships with a reversible deep-carry pocket clip.

Crossbar Deployment Methods

The platform supports three distinct opening methods depending on the model. Thumb hole deployment provides direct blade access. Flipper deployment uses a protruding tab on the blade tang. Lock-assisted flick leverages the crossbar spring to accelerate the blade into the open position once the user pushes past the detent. The Ultra XR runs thumb hole only. The Terminus XR provides both flipper and thumb hole access. The Pentagon XR and Seal XR offer all three.

XR Lock Steel Tiers — D2 to CTS XHP

Steel selection scales with the model tier. The Altair XR and SOG-TAC XR run Cryo D2. Mid-tier models like the Terminus XR LTE and Vision XR step up to CPM S35VN. The top of the XR platform—Ultra XR, Seal XR, and One-Zero XR—runs CTS XHP and CPM S35VN. The One-Zero XR is built entirely in the USA on CTS XHP.

Kiku Matsuda & Mikkel Willumsen Collaborations

The Kiku XR and Kiku XR LTE are collaborations with Japanese bladesmith Kiku Matsuda, featuring his signature blade geometry on G-10 and Micarta scales with CTS XHP steel. The Prophen XR is a Mikkel Willumsen design with a cleaver-influenced profile and XR Lock internals.

Handle Materials & Carry Configurations

Handle materials span GRN and G-10 on standard models, carbon fiber on the Terminus XR LTE, linen Micarta on the Kiku XR LTE, and aluminum on the One-Zero XR. The Vision XR LTE runs a tanto blade profile in a titanium and carbon fiber build—one of the few XR models built around a tanto grind.
 
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