Sanrenmu Partner PT721 Folding EDC Knife — Minimalist Design and Practicality

The Sanrenmu PT721 is a compact folding knife in the EDC (everyday carry) category. It is made entirely of stainless steel and features a slim, elegant profile. The handle is only 8 mm thick—perfect for a pocket or backpack.

The design is minimalist and stylish. It even goes well with business attire.

Sandvik 12C27N steel blade

The blade is made of Sandvik 12C27N steel—a martensitic stainless steel optimized for sharpness, stability, and corrosion resistance. Sanrenmu uses cryogenic treatment to achieve a hardness of 58–60 HRC.

The result is a blade that retains its edge for a long time and is easy to sharpen.

Slip Joint Mechanism—Traditional and Reliable

The knife uses a slip joint mechanism—a spring that holds the blade in the open or closed position without a fixed lock. It is opened using a thumb stud or a pin on the blade.

The blade is held open by spring tension
Use with caution—the blade may close if pressure is applied incorrectly
A typical mechanism for traditional pocket knives
Close it carefully, using your fingers to control the motion

Built-in scissors—an added feature

The PT721 model is equipped with scissors that are 75 mm long—significantly longer than the standard length for knives in this class. The combination of a blade and scissors makes it a truly multifunctional knife.

Technical Specifications

Specifications	Value
Brand	Sanrenmu
Model	Partner PT721-SB
Type	Folding knife
Category	Multifunctional Knives / EDC
Total length	168 mm
Blade Length	74 mm
Blade Thickness	2.5 mm
Steel on the blade	Sandvik 12C27N
Hardness	58–59 HRC
Handle Length	92 mm
Handle Thickness	8 mm
Handle Material	3Cr13 Stainless Steel
Weight	76 years
Locking mechanism	Slip Joint
Additional Tools	75 mm Scissors
Country of Origin	China

Frequently Asked Questions

What is an EDC knife, and what is it used for?

EDC stands for Every Day Carry. These are compact knives designed for everyday use—opening packages, cutting string, and small household tasks. The Sanrenmu PT721 is exactly that kind of knife—lightweight, slim, and comfortable to carry in your pocket or backpack at all times. Its thickness of just 8 mm makes it almost unnoticeable.

What is Sandvik 12C27N steel, and why is it a good choice?

Sandvik 12C27N is a martensitic stainless steel from the Swedish manufacturer Sandvik. It has been specially optimized for knives that require high sharpness, edge retention, and corrosion resistance. For the PT721, the steel undergoes additional cryogenic treatment by Sanrenmu to achieve a hardness of 58–60 HRC. This is a well-balanced steel—neither too brittle nor too soft.

What is the Slip Joint mechanism?

A slip joint is a simple mechanism without a fixed lock. A spring holds the blade open or closed through tension. The blade is opened with a thumb stud or a pin by overcoming the spring’s resistance. If pressure is applied in the wrong direction, the blade may close, so caution is required. This is precisely why many traditional pocket knives with this mechanism also feature a half-lock for added safety.

What are the thickness and weight of the Sanrenmu PT721?

The PT721's handle is only 8 mm thick, making it exceptionally slim for a knife in this category. It weighs 76 grams—light enough for everyday carry without weighing down your pocket. The total length is 168 mm, and the handle length is 92 mm.

Are there scissors included in the set, and how long are they?

Yes, the Sanrenmu PT721 features built-in scissors that are 75 mm long. This is significantly larger than the scissors typically found on knives in this class. They make the PT721 more versatile than a standard EDC knife and turn it into a practical tool for everyday tasks.

What material is the PT721 handle made of?

The handle is made of 3Cr13 stainless steel. This gives the knife a uniform, all-metal look. The material is corrosion-resistant and gives the PT721 a stylish and minimalist look, suitable even for more formal settings.

Is the Sanrenmu PT721 suitable for everyday wear in an urban setting?

Yes, the PT721 is designed specifically for everyday use in an urban environment. Its slim 8-mm profile and minimalist design make it unobtrusive and comfortable. It even goes well with business attire. The combination of a blade and scissors makes it a versatile tool for the office, travel, or everyday tasks.

Weight

0,076 kg

Dimensions

0,8000 cm