Premium HSS & Carbide Three-Knife Trimmer Sets for Bookbinding
Bookbinding Knives
Matched 3-knife replacement sets (1 Front, 2 Sides) for high-volume print finishing. Bimetallic construction with 18% Tungsten HSS or solid Tungsten Carbide (TC) cutting edges. Direct OEM fit for Müller Martini, Kolbus, and Wohlenberg trimmers.
- ■Material: 18% Tungsten HSS (Duritan eq.) | Tungsten Carbide (TC)
- ■Applications: Perfect Bound Books, Magazines, Hardcover Book Blocks
■ ISO 9001:2015 Certified
■ In-House Heat Treatment
■ Strict Dimensional Tolerances
■ Global Door-to-Door Delivery
[ Engineering Reference ]
Decisive Specifications
| Material | 18% Tungsten HSS (Duritan eq.) | Tungsten Carbide (TC) |
|---|---|
| Construction | Bimetallic Inlay (Hard edge brazed to tough steel body) |
| Surface Finish | Mirror Lapped (Ra ≤0.1 μm) to prevent glue build-up |
| Set Configuration | Matched 3-Piece Set (1 Front Knife, 2 Side Knives) |
| OEM Tolerance | Thickness matched to ±0.01 mm across the full set |
| Applications | Perfect Bound Books, Magazines, Hardcover Book Blocks |
■ All values verified via CMM inspection · ISO 9001:2015
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Need a Specific Size or OEM Replacement?
Don't see your exact specs? Send us a blueprint, a worn sample, or just your machine model. Our team will review the details and provide a tailored quotation.
[ Standard Reference ]
Common Standard Dimensions
| OEM Machine Model | Blade Position | Dimensions (L × W × T) | Mounting Holes / Slots |
|---|---|---|---|
| Müller Martini 301/361 | Front Knife | 540 × 90 × 12 mm | 12 × M10 Threaded |
| Müller Martini 301/361 | Left & Right | 392 × 90 × 12 mm | 8 × M10 Threaded |
| Müller Martini 3671 Merit | Front Knife | 580 × 115 × 12 mm | 12 × M10, 1 Slot |
| Müller Martini 3671 Merit | Left & Right | 450 × 115 × 12 mm | 15 × M10, 2 Slots |
| Kolbus HD 150/153 | Front Knife | 510 × 110 × 10 mm | 10 × M10 Threaded |
| Kolbus HD 150/153 | Left & Right | 400 × 110 × 10 mm | 8 × M10 Threaded |
[ OEM Compatibility ]
Compatible Machine Brands
® Registered trademarks are property of their respective owners. Sureay supplies compatible replacement blades — not OEM-branded parts.
[ Technical Audit ]
Engineering Advantages
Bimetallic Inlay Technology
We braze a premium High-Speed Steel (HSS) or Tungsten Carbide edge onto a tough, flexible alloy steel body. This gives you the extreme wear resistance needed for coated paper, without the risk of the blade snapping under heavy clamping pressure.
Matched 3-Piece Sets
Supplied as a ready-to-install set (1 Front, 1 Left, 1 Right). All three blades are precision surface-ground in the same batch to a ±0.01 mm thickness tolerance, ensuring zero-downtime installation and perfect alignment.
Anti-Glue Mirror Finish
Cutting through book spines exposes the blade to hot, sticky PUR and EVA adhesives. Our blades are lapped to a microscopic mirror finish, preventing glue drag that would otherwise smear across the book’s edge.
[ System Inventory ]
Related Blade Categories
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[ Knowledge Base ]
Product FAQs & Buying Guidance
Technical FAQs
01When should I upgrade from HSS to Tungsten Carbide (TC) trimmer blades?+−
You should upgrade to Tungsten Carbide (TC) when cutting high volumes of recycled paper, gloss-coated art paper, or thick books bound with heavy PUR adhesive. Coated papers contain clay and minerals that dull HSS very quickly. TC blades provide 5 to 10 times the cutting life of HSS, drastically reducing machine downtime for blade changes.
02Why do my trimmer blades keep tearing or chipping the book spine?+−
Spine tearing is usually caused by one of three things: (1) The blade is dull and needs changing; (2) The bevel angle is incorrect for the type of paper/glue being cut; or (3) Adhesive build-up on the back of the blade is causing ‘drag’. Ensure your blades have a mirror-lapped finish to prevent glue adhesion, and consider upgrading to HSS or Carbide for better edge retention.
03Can Tungsten Carbide (TC) trimmer blades be resharpened?+−
Yes, but they must be sharpened using specialized diamond grinding wheels. Using standard aluminum oxide or silicon carbide wheels will destroy the carbide edge and generate micro-cracks. If your local sharpening service does not have the correct diamond wheel equipment, we recommend sending them to a specialized industrial grinder.
04What is the correct installation sequence for a three-knife set?+−
Because the side knives often shear slightly against the cutting stick or front knife path, alignment is critical. Install all three blades loosely first. Set and torque the front knife to establish the head datum, then alternate tightening the side knives. Since our 3-piece sets are ground to an identical thickness tolerance, they prevent the uneven clamping pressure that causes binding.
Why Choose Sureay
01Do your trimmer blades fit Kolbus, Wohlenberg, and Perfecta machines?+−
Yes. We maintain a comprehensive database of exact OEM blueprints for all major European and Japanese bookbinding lines, including Müller Martini, Kolbus, Wohlenberg, Perfecta, and Horizon. The mounting holes, slots, and threaded inserts will be a perfect drop-in fit.
02What is the lead time for a custom Tungsten Carbide trimmer set?+−
Standard HSS sets for popular Müller Martini and Kolbus models are often in stock. Custom Tungsten Carbide (TC) inlaid sets typically require 15–20 working days to manufacture, due to the complex vacuum brazing and diamond grinding processes required for carbide.
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