Tenable Fenrir T1034F9 Blue Coated 14C28N Blade Jade G10 Handle Button Lock Folding Knife

The Tenable Fenrir T1034F9 is a precision-engineered EDC folding knife crafted by Greg Schob, a master metalworker dedicated to creating functional everyday carry solutions. Featuring a blue-coated Sandvik 14C28N harpoon-style blade with a generous belly, this knife excels at slicing, piercing, and detailed cutting tasks while maintaining a striking visual presence. The Jade G10 handle offers superior ergonomics with chamfered edges and exceptional grip texture, ensuring comfort and control during extended use. The innovative Button Lock mechanism delivers smooth, satisfying deployment with a fidget-friendly action, while multiple deployment options including thumb studs provide flexibility in how you engage the blade. The perfectly balanced bolster design places weight directly in your hand for enhanced control and security. A reversible deep carry pocket clip accommodates both left and right-handed users, keeping your knife discreetly accessible whenever needed. Whether you're tackling practical cutting tasks or simply enjoying the tactile experience, the Fenrir seamlessly blends functionality with pure enjoyment, making it an indispensable addition to any serious EDC collection.

SPECIFICATIONS

Overall Length	7.93''/201.3mm
Blade Length	3.45''/87.6mm
Blade Thickness	0.138‘‘/3.5mm
Blade Material	Blue Coated 14C28N
Blade Style	harpoon blade
Blade Grind	Flat Grind
Blade Finish	Blue Coated
Handle Material	Jade G10 with Purple Undead Print
Color	Purple
Lock Type	Button Lock
Weight	4.23oz/120g
Model Name	Fenrir
Model Number	T1034F9
Designer	Sparrow Knife

Tenable Fenrir T1034F9 - 14C28N Harpoon Button Lock Folder

The Tenable Fenrir T1034F9 is the big one in the family: a 3.45 in harpoon blade in a 7.93 in frame, designed by Greg Schob of Sparrow Knife Co. The Nitro-V stainless wears a blue coating over a flat grind, and the blade opens on a button lock instead of a liner - press the button and it closes freely under gravity, with your fingers never crossing the blade path and no handedness penalty. The Jade G10 handle carries a purple undead print that is dyed into the laminate rather than printed on it, so it cannot peel or rub off. At 4.23 oz it is a knife you feel in your hand, which is exactly what a 3.45 in blade should feel like. Browse Tenable knives and Fenrir folders.

14C28N Behind a Blue Harpoon Blade

14C28N at 59-61 HRC is the right steel for a long harpoon point. Its edge stability means the thin, fine tip resists chipping under the lateral loads that a longer blade experiences, and its corrosion resistance means you are not chasing rust spots after a day in damp weather. The blue coating over the top is decorative and mildly protective - it hides the scratches of daily carry and makes the knife unmistakable on a bench or in a bag, while the steel underneath behaves exactly like uncoated 14C28N. Sharpen it like any 14C28N blade: a 1000-grit stone, light pressure, then a loaded strop. Compare it against Nitro-V, CPM-S35VN and D2 tool steel in the steel table below.

Why the Fenrir Belongs in Your Pocket

• 3.45 in (87.6 mm) coated 14C28N harpoon blade at 59-61 HRC.
• Button lock: one-handed closing, ambidextrous, fingers out of the blade path.
• 4.23 oz (120 g) and 7.93 in (201.3 mm) open - a genuinely full-size folder.
• Jade G10 handle with a dyed purple undead print; the pattern is structural, not printed.
• Flat grind on 0.137 in (3.5 mm) stock for a stable, hard-working apex.
• Caged ceramic ball bearing pivot with a fast, fluid open.
• Designed by Greg Schob of Sparrow Knife Co.
• Backed by EDCMALL: authentic stock, tracked worldwide shipping, simple returns.

Best Uses for the Fenrir

• Everyday carry for people who want real blade length - 3.45 in in a 4.23 oz package.
• Tactical and defensive carry: the button lock releases one-handed without putting a finger in the blade path.
• Camping, hiking and backpacking where a bigger blade earns its weight.
• Workshop and garage tasks, cutting hose, tarp, straps and packaging.
• Collector display - the purple undead Jade G10 over a blue blade is a statement no plain folder matches.

Frequently Asked Questions

Who designed the Tenable Fenrir?
Greg Schob of Sparrow Knife Co, the metalworker behind the whole Fenrir line at Tenable. The Fenrir is his EDC flagship pattern.

How does a button lock work?
A spring-loaded button in the scale pushes a crossbar into a notch on the blade tang. Press the button and the blade closes freely under gravity. It is fully ambidextrous, keeps your fingers out of the blade path, and doubles as a fidget lock.

Is the blue blade a coating or a heat treatment?
It is a coating over 14C28N stainless. It is decorative and mildly protective rather than a hardness treatment, so the edge underneath behaves exactly like uncoated 14C28N.

What is Jade G10 with an undead print?
A layered G10 composite, milled and dyed so the surface shows a purple undead pattern with green eye motifs. It is structural, not a print, so it cannot peel or rub off.

Is 4.23 oz too heavy for EDC?
It is on the heavy side for a folder of this size, but the weight comes from a 3.45 in blade and a full-width handle that fills the palm. If you want a knife you feel in your hand rather than forget, this is the trade.

Sandvik 14C28N vs. Common Pocket Knife Steels

Steel	Typical HRC	Edge Retention	Corrosion Resistance	Toughness	Sharpening Ease
14C28N (this knife)	59-61	Good	Excellent	Good	Very Easy
Nitro-V	59-61	Good	Very Good	Better	Easy
CPM-S35VN	58-60	Very Good	Very Good	Better	Moderate
D2 Tool Steel	58-61	Very Good	Fair	Good	Moderate
8Cr13MoV	57-59	Fair	Good	Good	Very Easy
AUS-8	57-59	Fair	Good	Good	Very Easy

Sandvik 14C28N is a nitrogen-alloyed martensitic stainless that reaches 59-61 HRC in production heat treats. It gives up some raw edge retention to CPM-S35VN and D2 in exchange for excellent corrosion resistance and edge stability that is almost impossible to chip. HRC figures are typical mill ranges, not a guarantee for any single blade.

Glossary of Key Terms

Sandvik 14C28N
A nitrogen-alloyed martensitic stainless from Sandvik, hardened to 59-61 HRC in production knives. Excellent stain resistance, a fine stable edge and very easy sharpening - the best all-round budget-to-mid EDC stainless.

Harpoon Blade
A profile with a swage notch cut behind the tip. It reduces drag on the pierce, adds a thumb index point and gives the blade an aggressive silhouette.

Liner Lock
A spring steel bar inside the handle that snaps behind the blade tang on opening; press it sideways with your thumb to fold the knife closed.

Ceramic Ball Bearing
Pivot bearings made of ceramic that stay glassy smooth, cannot corrode and keep the flipper action consistent in humid pockets.

Flat Grind
An edge whose flats taper in a straight line from the spine to the apex - a strong all-round geometry that slices well and resists chipping.

Compound Grind
A blade that carries two grind angles, usually a thinner primary bevel near the edge and a thicker one toward the tip, balancing slicing and tip strength.

Stonewash Finish
A tumbling process that bead-blasts the steel into a uniform matte grey, hiding carry scratches and killing glare.

Who Should Buy the Fenrir

• You want a big-blade folder that still rides in a trouser pocket.
• You prefer a button lock over a liner or frame lock for one-hand closing.
• You like loud, characterful materials - purple undead G10 with a blue blade is unmistakable.
• You want 14C28N toughness behind a long harpoon profile.
• You are left-handed and want zero compromise on lock or clip.

Who Should Skip It

• You want a featherweight knife. At 120 g it is at the top of the EDC range for a folder.
• You need a low-profile knife for office or dress carry.
• You want a blacked-out, fully subdued look - this blade is bright blue.
• You plan to abuse the tip. A long harpoon point is thinner than a drop point of the same stock.
• You need a sub-3-inch blade for legal reasons.

Care & Maintenance

• Wipe the blade dry after every use; 14C28N is strongly stainless but pocket sweat still speckles bare steel over weeks.
• One drop of quality knife oil at the pivot monthly, then cycle the action so it spreads through the ceramic bearings.
• Blow pocket lint out of the handle channel and lock track with compressed air before oiling so grit never grinds inside the pivot.
• Sharpen on a 1000-grit water stone or diamond plate; 14C28N grinds fast and takes a keen edge in a handful of passes.
• Finish on a loaded leather strop with light pressure - heavy passes round the apex and undo the edge you just set.
• Rinse with warm water and mild dish soap when it gets grimy, then dry thoroughly before it goes back in the pocket.
• Never pry, twist or use the tip as a screwdriver; side loads snap tips far faster than cutting ever will.
• Check the pocket clip screws every month or two with the correct Torx driver so the knife never rides loose.
• Store the knife closed and dry, never in a damp leather pouch that holds moisture against the steel.