Spyderco Endura 4 Blue FRN K390 Plain knife (C10FPK390)

Endura 4 FRN K390, Plain experienced people being outdoors prefer knives that do not need sharpening in the field. For discerning users, Spyderco has introduced a version of the Endura with a K390 steel blade. The exquisite E.D.C. with injection-molded liners in the elite blue color reserved for knives with a K390 MICROCLEAN steel blade.

In 1990, Spyderco introduced two models of knives, the Endura and Delica, creating a demand for lightweight one-handed opening folders at an affordable price. These products have become bestsellers. Thanks to their small size and low weight, they are an excellent choice as everyday EDC knives.

K390 MICROCLEAN® - state-of-the-art powdered cold working tool steel. Hardened in the 62-66 HRC range. Advanced alloy composition with high vanadium, tungsten and cobalt content provides strength and excellent sharpness retention. Manufactured in the Austrian smelter Böhler-Uddeholm.

Blade - with Clip Point profile, Plain smooth blade brought out with Full Flat Grind reducing the weight of the knife, improving cutting properties. Round SpyderHole cutout for opening the blade with the thumb. Notched section of the back of the blade, ramp (jimping / crosshatching) positions the thumb, gives solid support and makes it easier to operate the folder. Back-Lock blade lock with an additional Boye Detent cutout, preventing accidental release of the lock when gripping the knife firmly.

Handle - linings in blue color, reserved for knives made of K390 steel. Non-slip Bi-Directional Texturing (Bi-Directional Texturing) and notched handle ridges (Spine Jimping) strengthen the grip even with wet hands. Made of FRN (Fiberglass Reinforced Nylon), a fiberglass-reinforced nylon plastic. Metal hourglass clip with 4-way (up/down, right/left) 4-way clip positions. In the back of the handle a hole (lanyard hole) for a cord.

Skeleton - two steel plates with cut-out holes, to which the facings are attached. This provides high strength and stiffness with low weight of the knife. Reinforced fully demountable structure connected by torx screws. Phosphor bronze washers make it easy to open and close the knife.

Technical data:

Product number: C10FPK390
Product name: Endura 4 Blue FRN, K390 Plain

Overall length: 223.0 mm / 8.78"
Blade length: 97.0 mm / 3.8"
Handle length: 126.0 mm / 4.98"
Blade thickness: 3.0 mm / 0.118"
Handle thickness: n.d.
Weight: 94.0 g / 3.3 oz

Blade material: K390 MICROCLEAN
Blade hardness: n.d.
Blade grind: Full Flat
Blade finish: Satin

Handle material: FRN
Handle finish color: Blue
Backspacer material: Stainless steel
Backspacer color: Silver

Clip: Left/Right, Tip-up/Tip-down
Clip material: Stainless steel

Pivot mechanism: Pads
Locking mechanism: Back Lock
Opening method: Manual, Spyder Hole
Additional accessories: n.d.

Designer: Sal Glesser
Brand: Spyderco
Manufacturer: Spyderco
Country of Origin: USA

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