Spyderco Endura 4 Lightweight – 3.80" Plain-Edge K390 Tool Steel, Stonewashed Blade, FRN Lightweight Chassis with 4-Position Clip (C10FPK390)

Model: C10FPK390 • UPC: 716104013746 • Blade: 3.80" K390 Microclean® tool steel, plain edge, stonewashed • Handle: Lightweight FRN with Bi-Directional Texturing™ • Lock: Back Lock • Opening: Ambidextrous Round Hole™ • Carry: 4-position pocket clip

Meet the big, featherweight slicer built for relentless daily use: the Spyderco Endura 4 Lightweight K390 (C10FPK390). It pairs a long, efficient 3.80-inch plain-edge blade in high-performance Böhler K390 tool steel with Spyderco’s proven FRN (fiberglass-reinforced nylon) handle. The result is a pocket-friendly workhorse that chews through cardboard, rope, and tough media while shrugging off long shifts and hard miles. The stonewashed finish tames glare and hides wear, while the Back Lock, Round Hole™ opener, and four-position clip make the Endura 4 fully ambidextrous and ready for any pocket, any task.

Why Choose K390 on the Endura 4 Platform

• Top-tier edge retention: K390 Microclean® is a vanadium- and tungsten-rich particle metallurgy steel prized for exceptional wear resistance—it stays sharp noticeably longer than common stainless steels.

• Aggressive slicing power: The Endura’s lean blade geometry and full-length plain edge provide low-drag cuts through dense, fibrous materials.

• Stonewashed utility: The finish minimizes reflections and helps mask scratches from real-world use.

• Lightweight strength: FRN scales over skeletonized stainless liners hit the sweet spot of rigidity and ultra-low pocket weight.

• Locked-in traction: Bi-Directional Texturing™ grips forward and backward to reduce slip during power cuts and wet conditions.

• True ambidexterity: One-hand Round Hole™ opening, a strong Back Lock, and a 4-position clip (tip-up/tip-down, left/right) fit your carry style.

• Field-serviceable: Open-backed construction (with backspacer) and phosphor-bronze washers (model dependent) simplify cleaning and maintenance.

Note on K390: This high-carbon tool steel delivers elite edge life. It is not fully stainless—wipe dry after use and apply a light oil to discourage patina/corrosion.

Key Features at a Glance

• Blade Length: 3.80" (plain edge), stonewashed K390 tool steel

• Cutting Geometry: Thin, high-efficiency profile for deep, controlled slicing

• Handle: FRN, Bi-Directional Texturing™, stainless liners, lanyard hole

• Locking Mechanism: Back Lock with secure mid-spine engagement

• Carry: Four-position hourglass clip for left/right and tip-up/tip-down carry

• Opening Method: Ambidextrous Round Hole™

• Model / UPC: C10FPK390 / 716104013746

• Country of Origin: Seki-City, Japan

What It’s Great For

• High-volume cutting: Warehousing, shipping, trades, and outdoor tasks where edge life matters.

• EDC & work knife: Big reach, light in pocket, and confidence-inspiring traction in all conditions.

• Food & camp chores: Thin grind and long edge make quick work of prep, cordage, and tent duty (wipe blade after acidic foods).

Care & Maintenance

• Edge upkeep: K390 loves fine ceramics or diamond stones; strop lightly to keep the apex screaming sharp.

• Corrosion care: Wipe dry after use; a thin coat of oil or corrosion inhibitor protects the tool steel.

• Hardware check: Periodically tighten clip and handle screws; add a dab of blue threadlocker if needed.

Specifications (Summary)

• Brand/Series: Spyderco Endura 4 Lightweight

• Model: C10FPK390

• Blade Steel: Böhler K390 Microclean® tool steel

• Blade Length: 3.80", plain edge, stonewashed finish

• Handle: FRN with Bi-Directional Texturing™

• Lock: Back Lock

• Opening: Round Hole™ (one-hand, ambidextrous)

• Pocket Clip: 4-position stainless hourglass

• Origin: Seki-City, Japan

• UPC: 716104013746

SEO Highlights (What Shoppers Search)

• Spyderco Endura 4 K390 stonewashed

• C10FPK390 716104013746 plain-edge 3.80"

• Endura 4 Lightweight FRN Bi-Directional Texturing

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• Back Lock Round Hole four-position clip

Meta Title (SEO)

Spyderco Endura 4 Lightweight – 3.80" Plain K390, Stonewashed Blade, FRN, 4-Position Clip | C10FPK390 | 716104013746

Meta Description (SEO)

Cut longer with the Spyderco Endura 4 Lightweight K390: 3.80" plain-edge stonewashed K390 tool steel, FRN with Bi-Directional Texturing, Back Lock, Round Hole opener, and 4-position clip. Made in Seki-City, Japan. Model C10FPK390.

Structured Data (JSON-LD)

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**Longer edge life, lighter carry, bigger capability—**the Spyderco Endura 4 Lightweight K390 (C10FPK390) is the hard-use cutter that keeps cutting when others tap out. The End