Self Locking Knife Holders are precision components designed for shear slitting systems, rewinders, slitter rewinders, slitting machines, and inspection equipment. They are used to securely mount dished knives on the upper knife shaft and maintain stable cutting pressure during operation.
Manufactured from high-strength special steel with a black oxide finish, the holders provide improved corrosion resistance and wear resistance for demanding industrial applications.
The holder features a self-locking ball mechanism that engages automatically when the machine starts, helping maintain secure knife positioning even when the shaft locking mechanism has not been fully engaged. This design provides an additional level of operational safety and reliable knife retention.
Each holder is supplied with a spring and snap ring. Spring specifications can be selected according to the material being processed and the required cutting pressure.
Self-locking ball mechanism for secure knife positioning
Automatic locking engagement during machine operation
High-strength special steel construction
Black oxide finish for improved corrosion and wear resistance
Supplied with spring and snap ring
Designed for dished knives and shear slitting systems
Standard sizes available
Custom designs manufactured according to drawings or machine specifications
Replacement locking components and springs available
The key feature of this knife holder is its self-locking ball mechanism.
When the machine starts operating, the locking mechanism automatically engages to help secure the knife holder on the shaft. This provides reliable knife positioning and helps reduce the risk of unintended holder movement during operation.
The self-locking design is particularly useful for slitting systems where stable knife positioning and operational safety are important.
The locking and unlocking directions should be correctly followed according to the specific holder and machine configuration.

Spring Configuration & Cutting Pressure
The Self Locking Knife Holder is supplied with a spring and snap ring. The spring controls the cutting pressure applied between the upper dished knife and the bottom knife.
Spring selection can be adjusted according to:
● Spring length
● Wire diameter
● Operating characteristics
● Material type
● Material thickness
● Required cutting pressure
Correct spring selection helps maintain stable contact between the dished knife and bottom knife and supports consistent shear cutting performance.
Dished Knife & Shear Slitting Compatibility
Self Locking Knife Holders are designed to support dished knives as part of a complete shear slitting unit.
The upper knife holder and dished knife work against the bottom knife mounted on the bottom shaft. Controlled cutting pressure between the upper and bottom knives produces precise and stable shear cutting.
The system is suitable for processing:
● Paper and paperboard
● Aluminum foil
● Plastic films
● Metal films
● Flexible laminates
● Adhesive materials
● Labels
● Nonwoven materials
The appropriate dished knife geometry and steel grade should be selected according to the material and cutting conditions.
As a custom knife holder manufacturer, WINGCHONG KNIFE can manufacture Self Locking Knife Holders according to customer drawings, samples, machine specifications, and application requirements.
Customization options include:
| Outer Diameter | Inner Diameter | Thickness |
| 62 | 25 | 40 |
| 75 | 30/40 | 40/50 |
| 100 | 45/60 | 65/70/75 |
| 105 | 45/60 | 65/70/75 |
| 130 | 60/80 | 100 |
| 150 | 100 | 120 |
| Material: chrome-alloyed (1.5 % Cr) | ||
● Holder dimensions
● Shaft mounting dimensions
● Knife mounting configuration
● Ball-locking mechanism
● Spring specifications
● Snap-ring configuration
● Material and surface treatment
● Dimensional tolerances
Custom manufacturing is suitable for OEM replacement parts, machine builders, distributors, and industrial slitting users.
WINGCHONG KNIFE supplies replacement components for Self Locking Knife Holders, helping customers maintain reliable slitting performance.
Available replacement parts include:
● Springs
● Seeger rings
● Locking balls
● Eccentric rings
● Other locking mechanism components
Regular inspection of the locking mechanism, knife seating area, spring, and retaining components is recommended. Excessive wear in the knife seating area may affect knife positioning and cutting consistency.

Complete Shear Slitting Unit
WINGCHONG KNIFE manufactures the main components of a complete shear slitting unit, including:
● Self Locking Knife Holders
● Dished Knives
● Bottom Knives
● Springs
● Seeger Rings
● Locking Components
● Related shaft components
Supplying matching components from one manufacturer helps ensure dimensional compatibility, reliable installation, and consistent system performance.
Applications
Self Locking Knife Holders are commonly used in:
● Slitter rewinders
● Rewinding machines
● Slitting machines
● Shear slitting systems
● Inspection tables
● Paper converting
● Flexible packaging
● Film and foil processing
● Label converting
● Nonwoven converting
Custom Manufacturer: Manufactured according to drawings, samples, or machine specifications.
Self-Locking Design: Automatic ball-locking engagement helps maintain secure knife positioning during operation.
High-Strength Construction: Special steel construction with black oxide treatment provides improved wear and corrosion resistance.
Flexible Spring Options: Spring specifications can be selected according to material and required cutting pressure.
Replacement Parts Support: Springs, locking balls, Seeger rings, eccentric rings, and other components are available.
Complete Component Capability: Dished knives, bottom knives, and knife holders can be manufactured as a matched shear slitting system.
Abrasive Cutting Knives are industrial cutting tools specifically designed for cutting abrasive rolls such as sandpaper and abrasive cloth.
Dished knives are circular cutting tools used for shear-type slitting. Unlike completely flat “flat knives,” their blades feature a concave geometric shape (resembling a plate or dish), a design that enables them to generate specific lateral cutting forces during rotational shearing.
Adhesive materials: Self-adhesive labels, adhesive tape, various composite films (die-cutting can create a temporary seal along the cut edges).
Elastic/soft materials: Rubber, non-woven fabric (NWF), textiles, tissue paper.
Abrasive/hard materials: Materials such as sandpaper that can quickly wear down standard sharp blades.