JINGLIN × BOWEN | M390 Precision Curved Trimming Knife
Master the Curve. Elevate the Detail.
The BOWEN M390 Curved Trimming Knife is engineered for artisans who demand surgical precision in tight radii, hollow areas, and intricate cutwork. Unlike standard utility knives, this specialized blade is purpose-built to navigate small-radius curves and internal cutouts that straight knives simply cannot reach.
Why Professionals Choose This Blade
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Pre-Heat Treated Böhler M390 Powder Steel Most leather knives are heat-treated after machining, which can lead to structural inconsistency. We start with factory-hardened Böhler M390 steel. This ensures a uniform molecular structure from day one, delivering world-class wear resistance and a stable edge that outperforms batch-treated alternatives.
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Cryogenic Hardening (HRC 60–62) Through a deep cryogenic process, the steel achieves a hardness of HRC 60–62. This provides the perfect "sweet spot": extreme edge retention for continuous work, while remaining tough enough to resist chipping during delicate hand-guided maneuvers.
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Precision Single-Bevel V-Grind The hand-ground single-bevel V edge is specifically tuned for controlled trimming. This geometry allows the blade to "hug" the cutting line, making it significantly easier to follow complex patterns and achieve clean, vertical edges on curved leather pieces.
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Industrial-Grade Materials Equipped with a High-Density Purple Sandalwood handle and a solid H62 Brass Ferrule, this knife offers a balanced, weighted feel. The materials are selected for their natural resistance to moisture and their ability to withstand the rigors of a daily-use workshop environment.
Who It’s For
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Leathercrafters who cut small curves, inside curves, and detailed shapes
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Makers who want a knife with better edge retention and corrosion resistance
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Users looking for a fine trimming knife for detail work rather than a general-purpose cutter
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Anyone who wants a more specialized blade for work that standard straight knives do not handle as neatly
Why This Steel Matters
A lot of leather knives on the market are cut first from softer steel and heat-treated later. In practice, that can lead to uneven results depending on the heat treatment process and batch size. This knife takes a different route by using already heat-treated hard steel as the starting material, helping preserve the performance potential of the steel itself. For a tool like this, the steel and heat treatment are a big part of what makes the edge feel reliable over time.
Blade steel: Böhler M390 Powder Steel
Ferrule / guard material: H62 brass
Hardness: HRC 60–62
Overall length: 140 mm
Blade width: 11 mm
Blade edge length: 28 mm
Blade thickness: 1.2 mm
Shipping Policy
We Offer Worldwide Shipping.
Once Your Payment Is Confirmed, We Will Begin Processing Your Order. For Custom Products, Production Time May Vary Depending on the Complexity of Your Order. Shipping Times Will Also Depend on Your Location and the Selected Shipping Method. Once Your Order Has Been Shipped, A Tracking Number Will Be Provided via Email.
Please Ensure Your Shipping Information Is Accurate to Avoid Delays or Delivery Issues.
Return Policy
Thank You for Choosing Jinglin! We Are Committed to Providing High-Quality Products. Please Ensure You Are Confident in Your Product Choice Before Purchasing. Below Is Our Return Policy:
Custom Product Returns
Our Custom Brass Molds and Hot Stamping Machines Are Made to Order Based on Specific Customer Requirements. As Such, We Do Not Accept Returns Without Reason. If Your Custom Product Has Quality Issues or Does Not Match Your Order, Please Contact Us Immediately—we're Here to Help.
Quality Issues or Defects
If You Receive a Product with a Manufacturing Defect or Damage, Please Contact Us Within 7 Business Days of Receiving Your Goods. Don’t Worry—we Will Provide a Solution Based on the Specific Situation.
Important Notice
Please Note That Once Production of Custom Products Has Begun, We Do Not Accept Returns Without Reason. Ensure All Product Specifications and Requirements Are Confirmed Before Placing Your Order.
Thank You for Your Understanding and Support!
If You Have Any Questions or Concerns, Please Don’t Hesitate to Reach out to Us At:
Lucy@jinglinmachine.com
Your Satisfaction Is of the Utmost Importance to Us!
