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Cold Steel Roach Belly

Cold Steel Roach Belly — knife (steel 4116 (Krupp, Germany))

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SKU: 20RBC

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$29

Features

Weight, g

74.0

Overall Length, mm

216.0

Blade Length, mm

114.0

Handle Length, mm

102.0

Blade Thickness

2.5

Blade Material

*comparison of steel characteristics

Blade Steels

Each material possesses unique chemical and physical properties, and understanding your blade's characteristics can help you make informed choices.

Steel Composition

Steel	Typical Hardness (HRC)	Toughness	Edge Retention	Corrosion Resistance	Ease of Sharpening
M390	60–62	★★★★☆	★★★★★	★★★★☆	★★☆☆☆
S35VN	59–61	★★★★☆	★★★★☆	★★★★☆	★★☆☆☆
140Cr14MoV3Nb	59–61	★★★★☆	★★★★☆	★★★☆☆	★★★☆☆
SRM 140Cr Laminated	61–63 (Core Layer)	★★★★☆	★★★★☆	★★★★☆ (Outer Layers)	★★★☆☆
154CM	58–61	★★★☆☆	★★★★☆	★★★★☆	★★☆☆☆
N690	58–60	★★★★☆	★★★☆☆	★★★★★	★★★☆☆
14C28N	57~59	★★★★★	★★★☆☆	★★★★★	★★★★★
10Cr15CoMoV	58–60	★★★★☆	★★★★☆	★★★★☆	★★★☆☆
D2	59–61	★★☆☆☆	★★★★★	★★☆☆☆	★☆☆☆☆
12C27	56–58	★★★★☆	★★☆☆☆	★★★★★	★★★★★
8Cr13MoV	57–59	★★★☆☆	★★☆☆☆	★★★☆☆	★★★★★

4116

Hardness

Blade Hardness: What Does This показатель Mean?

Blade hardness is one of the most important knife characteristics. It shows how resistant the steel is to wear, deformation, and edge dulling. Hardness is usually measured using the HRC scale (Rockwell Hardness Scale).

Simply put: the higher the HRC value, the longer the knife keeps its sharp cutting edge.

How to Understand Hardness Ratings?

Most modern knives have hardness levels between 54 and 64 HRC.

54–57 HRC — softer steel, easy to sharpen, handles impact well, but loses sharpness faster.
58–60 HRC — the best balance between strength, wear resistance, and ease of sharpening. The most popular choice for EDC and outdoor knives.
61–64 HRC — hard premium steel, keeps its edge for a long time, but is harder to sharpen and may be more brittle under heavy side loads.

How Does Hardness Affect Your Choice?

The right choice depends on how you plan to use the knife:

For everyday carry (EDC), medium hardness is usually the best option — practical and reliable.
For heavy-duty work, bushcraft, or hard use, slightly softer steel can be better because it is less brittle.
For premium, collector, or maximum-performance cutting knives, higher hardness is often preferred.

Important to Remember

Higher hardness does not always mean better.

A blade that is too hard can become brittle, while a blade that is too soft may lose sharpness too quickly.

The ideal knife is a balance between hardness, toughness, and your real-world usage needs.

That is why, when choosing a knife, it is important to look not only at the brand or design, but also at the blade hardness rating.

56–57 HRC

Handle Material

Polypropylene

Decoration

Satin

Sharpening

Sharpening Guide

Generally speaking, when sharpening your SRM blade, we recommend maintaining a constant angle of 15°.

In most cases, the angle of the SRM blade is approximately 15°. We recommend maintaining a constant angle of 15°. However, for some knife models, due to their different purposes, the angle is greater than or less than 15°. When sharpening the knife, please observe carefully and adjust the angle appropriately according to the actual situation.

1. Clean your knife: Wipe it with a soft cloth to ensure that there is no oil, dirt or impurities on the blade.

2. Moisten the whetstone: Moisten the whetstone before use or apply a small amount of oil to the surface of the whetstone.

3. Fix the whetstone: Place the whetstone on a stable surface to ensure that it will not slide. If necessary, put a towel underneath to prevent slipping.

4. Roll the blade for sharpening: Place the blade against the rough side of the whetstone at an angle of 15 degrees, and push evenly from the heel to the tip of the knife, maintaining a consistent force and angle. Repeat 10-20 times, and then turn the knife over to sharpen the other side. Remember not to sharpen the knife vertically, otherwise it will damage the structure of the blade and reduce the durability of the blade.

• Generally speaking, the two sides of the whetstone have different grit numbers. Check the markings on your whetstone or its packaging to determine the grit numbers of the two sides.

5. Polish: Turn the whetstone over to the other side and repeat the first two steps to polish the blade.

The main function of the honing rod is to repair the micro burrs on the blade edge, rather than truly grinding the metal like.

Hollow

Lock Type

Lock Type: What Does It Mean?

The lock type defines the mechanism that secures the blade in the open position. It is responsible for user safety by preventing the blade from accidentally closing during use.

In simple terms: it is the system that keeps the knife locked open under pressure.

Main Types of Folding Knife Locks

There are several common lock mechanisms used in folding knives:

Liner Lock — a metal liner inside the handle locks the blade in place. Lightweight, practical, and very popular for EDC knives.
Frame Lock — part of the handle itself acts as the locking mechanism. Stronger and more robust.
Back Lock — a spine-mounted locking system. Known for its durability and reliability.
Button Lock — the blade is locked and released using a button. Fast and very convenient.
Crossbar Lock (Axis-style lock) — a modern ambidextrous system with smooth operation and high strength.
Slip Joint — does not lock the blade rigidly but provides resistance. Common in traditional or urban knives.

How Lock Type Affects Your Choice

Your choice depends on how you plan to use the knife:

For everyday carry (EDC), Liner Lock and Crossbar Lock are popular due to their balance of safety and convenience.
For heavy-duty tasks, Frame Lock and Back Lock are preferred for their strength.
For fast and intuitive use, Button Lock is ideal.
For traditional or lightweight urban knives, Slip Joint is commonly used.