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Spyderco® YoJumbo™ Large-Format Tactical Folding Knife – 3.98" CPM® SPY27® Hollow-Ground Wharncliffe Blade – Cobalt Blue Peel-Ply Textured G-10 Handles – Compression Lock® – Made in USA – C253GPCBL
Product Description
The Spyderco® YoJumbo™ Large-Format Tactical Folding Knife (C253GPCBL) represents an elite mechanical and material masterclass in personal security hardware and heavy-duty utility deployment, masterfully engineered in Golden, Colorado to satisfy the strict requirements of self-defense professionals and tactical operators worldwide. Designed by legendary close-quarters personal defense expert Michael Janich, this formidable folding knife builds upon the iconic legacy of the trendsetting Yojimbo™ 2, scaling up the entire frame architecture by more than 20% to accommodate larger hand sizes, extend reach, and amplify structural chopping leverage. While standard everyday carry folders compromise on tactical utility by utilizing swept-belly blade configurations that lose cutting power at the tip and slip under high impact velocities, the YoJumbo embraces an uncompromising, mathematically refined Wharncliffe profile. This professional-grade cutlery asset (716104018581) acts as an indispensable, zero-fail primary cutting tool for intensive defensive preparedness, law enforcement back-up staging, and demanding utility field tracking loops.
The structural and cutting foundation of this high-efficiency tactical folder relies on a premium, deeply hollow-ground blade crafted from CPM® SPY27® stainless steel, a state-of-the-art particle metallurgy alloy developed exclusively by Crucible Industries for Spyderco’s elite knife roster. This specialized steel matrix introduces a custom, cobalt-enriched chemical formula that masterfully multiplies the hardening effects of vanadium, niobium, molybdenum, and nitrogen. The resulting microstructure achieves an incredible hardness range of 59-61 HRC, yielding an unmatched technical equilibrium of extreme toughness, razor-sharp edge retention, and superb structural corrosion resistance. Because the Wharncliffe blade profile relies on a completely straight edge that slopes downward to an aggressively acute point, it transfers uniform, maximum separating force across the entire length of the cutting surface from base to tip, preventing slicing materials from skating free during sudden field applications.
The mechanical superiority and handling dynamics of this American-built tactical masterwork center around Spyderco's patented Compression Lock® mechanism nested securely within open-backed skeletonized stainless steel handle liners. Unlike standard liner locks or frame locks that force your support hand to cross into the closing path of the razor blade during manipulation, the compression lock is actuated on the spine of the handle, ensuring maximum user safety while providing immense structural shear strength under heavy torque loads. The sub-frame is enveloped by coarse, peel-ply textured Cobalt Blue G-10 scales that provide an unyielding, non-slip purchase even under wet, icy, or high-stress environments. Outfitted with an expansive, fully accessible Trademark Round Hole™ for rapid, ambidextrous one-handed manual deployment and a heavy-duty four-position pocket clip, this 5.30-ounce folding juggernaut delivers absolute mechanical authority, adapting flawlessly to tip-up or tip-down carry arrays on either side of your tactical gear layout.
Includes: (1) Spyderco YoJumbo Folding Knife (CPM SPY27 Stainless Steel Satin Blade, Cobalt Blue Peel-Ply Textured G-10 Scales, 4-Position Pocket Clip), and Spyderco Original Edge-U-Cation Branded Retail Product Staging Box with Factory Technical Spec Sheet.
*Safety & Blade Maintenance Guidance: The Spyderco YoJumbo relies on a highly acute Wharncliffe point and a razor-thin hollow-ground edge optimized for clean precision slicing; avoid applying violent lateral prying force to the tip, as excessive structural twisting can induce micro-fractures in high-hardness particle metallurgy matrices. The proprietary Compression Lock mechanism utilizes tight mechanical tolerances and should be kept clear of fine pocket lint, sand, or heavy carbon debris; periodically blowing out the open-backed channel with compressed air and applying a single micro-drop of high-viscosity synthetic lubricant to the pivot washers will ensure lightning-fast, drop-shut deployment speed over countless operational cycles.
Key Features
- Exclusive CPM® SPY27® Super Steel: Cobalt-enriched particle metallurgy core provides magnificent toughness and edge resilience, tailored exclusively for Spyderco’s elite American-made lineup.
- Patented High-Strength Compression Lock®: Top-mounted locking geometry delivers immense structural shear resistance while keeping the operator's fingers entirely clear of the blade closure path.
- Enlarged Michael Janich Ergonomics: Reworked frame scales up the legendary Yojimbo 2 profile by over 20%, optimizing pocket handling control and reach parameters for full-sized hands.
- Aggressive Straight-Edged Wharncliffe Profile: Straight hollow-ground plane guarantees a uniform transfer of raw cutting energy to maximize penetration and slicing mechanics simultaneously.
- Coarse Peel-Ply Cobalt Blue G-10: Textured synthetic fiberglass scales provide an unyielding grip texture that is impervious to thermal shifts, hand acids, or aquatic moisture degradation.
- Fully Ambidextrous 4-Position Pocket Clip: Accommodates individual tactical deployment layouts with configurable tip-up or tip-down, left or right-side pocket carry options.
Product Specifications
- Brand: Spyderco® Knives (Golden, Colorado, USA / Earth)
- Product Line: Signature Elite USA-Made Folding Cutlery Matrix
- Model Series Designation: Spyderco YoJumbo Compression Lock Cobalt Blue G-10 CPM SPY27
- SKU / MPN: C253GPCBL (Alternative Factory Identifiers: C253GPCBL-Spyderco / SP253GPCBL)
- Blade Edge Geometry Style: PlainEdge™ Deeply Hollow-Ground Wharncliffe Profile
- Blade Material Composition: Crucible Industries CPM® SPY27® Cobalt-Enriched Particle Metallurgy Stainless Steel
- Blade Finish / Coating: Classic Non-Reflective Satin Brushed Performance Texture
- Blade Hardness Rating: 59 - 61 HRC on the Rockwell C Scale
- Locking Mechanism Class: Patented Spyderco Compression Lock® Interface
- Handle Scale Composition: Peel-Ply Coarse Textured Cobalt Blue Injection-Molded G-10
- Sub-Frame Liner Architecture: Open-Backed Skeletonized High-Tensile Stainless Steel Liners
- Deployment Interface System: Ambidextrous 0.55" Signature Trademark Round Hole™
- Pocket Clip Interface Array: 4-Position Reversible Hourglass Tactical Pocket Clip (Left/Right, Tip-Up/Tip-Down)
- Blade Length Metric Profile: 3.98 Inches (101.00 mm) Extended Performance Edge
- Blade Thickness Spec Corridor: 0.145 Inches (3.70 mm) Heavy-Duty Spine Width
- Closed / Folded Length Profile: 5.37 Inches (136.00 mm) Pocket Footprint
- Overall Deployment Length: 9.29 Inches (236.00 mm) Absolute Reach Matrix
- Product Net Component Weight: ~5.30 oz (~0.33 lbs / 150.00 g) - Optimized Large Tactical Folder
- Total Packaging Shipping Mass: ~0.75 lbs (Enclosed Inside Protective Padded Retail Staging Box)
- UPC Barcode: 716104018581
