LionSteel Jack M390 G10 Black 77 mm Folding Knife

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LionSteel Jack M390 Folding Pocket Knife — Italian quality in a compact design

The LionSteel Jack M390 Black is a classic folding knife with a modern twist. Its precision craftsmanship and high-quality materials make it a reliable choice for everyday carry.

M390 Steel Blade—Durability and Sharpness

The blade is made of M390 steel with a hardness of 59–60 HRC. This steel is known for its excellent resistance to corrosion and wear.

Blade length: 77 mm
Blade thickness: 2.5 mm
Total length when open: 175 mm

G10 handle—a secure grip in all conditions

The G10 grip provides a secure hold even with wet hands. The material is lightweight, durable, and does not absorb moisture.

Color: black
Weight: only 53 grams

Slipjoint Mechanism—A Classic with Practicality

The Slipjoint system holds the blade in the open position using a spring mechanism. Closing the blade requires moderate force, which prevents it from accidentally folding while in use.

Specifications	Value
Brand	LionSteel
Model	Jack M390 Black
Type	Folding knife
Steel on the blade	M390
Hardness	59–60 HRC
Blade Length	77 mm
Blade Thickness	2.5 mm
Total length	175 mm
Handle Material	G10
Locking mechanism	Slipjoint
Weight	53 grams
Color	Black

Frequently Asked Questions

What are the advantages of M390 steel in folding knives?

M390 steel is a high-quality stainless steel with a hardness of 59–60 HRC. It contains chromium, molybdenum, vanadium, and carbon in balanced proportions. The blade retains its sharpness significantly longer than ordinary steels. Its corrosion resistance makes it suitable for use in wet conditions. The combination of hardness and flexibility reduces the risk of breakage or deformation during intensive use.

Why is a G10 handle suitable for a pocket knife?

G10 is a composite material made of glass fibers pressed under pressure with resin. It is lightweight, durable, and does not absorb moisture. The material does not warp with temperature changes and provides a reliable grip even with wet hands. G10 retains its appearance and structure even after years of use. These properties make it the material of choice for high-end knives.

How does the Slipjoint mechanism work, and is it reliable?

The slipjoint is a classic spring-loaded system used in traditional pocket knives. The blade is held in the open position by spring tension. Closing the knife requires moderate force, which prevents accidental folding during use. The mechanism is simple and has no complex parts, which reduces the risk of failure. It has been proven through years of use and ensures reliable performance when used correctly.

Is the LionSteel Jack M390 suitable for everyday carry?

Yes, this model is designed specifically for everyday carry. Weighing just 53 grams, it’s almost unnoticeable in your pocket. The 77-mm blade length is convenient for standard tasks—opening packages, cutting rope, or preparing food. Its compact size allows for discreet carrying in any setting. The classic design is suitable for both everyday use and more specific outdoor activities.

How do I maintain an M390 steel blade?

After use, it is recommended to wipe the blade with a dry cloth. For more intensive use, it can be cleaned with a mild soapy solution and dried thoroughly. Diamond or ceramic sharpeners are suitable for sharpening. The recommended sharpening angle is between 15 and 20 degrees. Avoid using the knife as a lever to preserve the integrity of the blade.

What is the total length of the LionSteel Jack M390 when extended?

When open, the knife has a total length of 175 mm. The blade is 77 mm long and 2.5 mm thick. These dimensions provide a good balance between compactness and functionality. The knife is comfortable to handle and isn’t cumbersome to use. Its size makes it suitable for carrying in a pocket without hindering movement.

Why should I choose LionSteel over other brands of folding knives?

LionSteel is an Italian brand with a long tradition of manufacturing high-end knives. Each model is crafted in accordance with strict quality standards. The company uses only premium materials such as M390 steel and G10 handles. The design combines classic aesthetics with modern functionality. The brand’s knives are prized by collectors and users alike who are looking for a durable and reliable product.