We can now guarantee that the thickness tolerance of ± 0.0005mm. For a certain inner circle, the tolerance can reach H3. All high-precision products are tested in a constant temperature room.
With the continuous improvement of machining precision of sheet metal, we have developed ultra high precision cutting tools, whose accuracy has so far been matched by precision milling tools. ± 0.001mm thickness tolerance, and Ra 0.1μ surface roughness are our routine standards. Using our know-how, we also meet our customers' higher tolerances for thickness, parallelism, flatness, outer and inner rings.
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Thickness Tolerance
± 0.0005 mm
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Surface Roughness
Ra 0.1 μ
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Inner Circle Tolerance
H3
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Quality Testing
Constant Temp. Room
Rubber Sleeve & Blade Bushing Specifications
We can also attach a rubber sleeve to the outer diameter according to the customer's request, so that it can be exported smoothly with the knife to prevent scratches. The rubber sleeve is made of natural primary rubber such as green amine and acrylonitrile butadiene rubber.
| Material / Component |
Specification / Standard |
| Acrylonitrile Butadiene Rubber |
IRHD: 78 ~ 75 |
| Polyurethane Isolation Ring |
IRHD: 80 ~ 85 |
| Blade Sleeve Material Common
|
S45C, S50C, 65Mn (S45C most common) |
| Blade Sleeve Thickness Range |
0.9 mm ~ 100 mm |
| Blade Sleeve Hardness |
47 ± 2 HRC |
| Blade Sleeve Thickness Tolerance |
Within ± 0.003 mm/mt |
| Aluminum Spacer Material |
AL7075 |
| Aluminum Spacer Thickness Tolerance |
Within ± 0.003 mm/mt |
The purpose of the blade bushing is to maintain a certain width between the dividing round knife, the upper knife and the lower knife, and to allow horizontal gap adjustment. The blade sleeve undergoes forging, machining, heat treatment, and leveling grinding processes. To reduce overall weight, we can also produce aluminum spacers using AL7075.
Frequently Asked Questions
What is the maximum thickness tolerance your high-precision products can achieve?
Our high-precision products can achieve a thickness tolerance of ± 0.0005mm. For specific inner circle dimensions, we can reach a tolerance grade of H3. All such precision products are tested and verified in a controlled constant temperature room.
What is the surface roughness standard for your cutting tools?
Our routine standard for surface roughness is Ra 0.1μ, combined with a thickness tolerance of ± 0.001mm. We can also accommodate customers' higher requirements for parallelism, flatness, and both outer and inner ring tolerances upon request.
Can you add a rubber sleeve to the outer diameter of the blade to prevent scratches?
Yes. We offer rubber sleeves attached to the outer diameter of the blade upon customer request. These sleeves are made from natural primary rubber materials, including green amine and acrylonitrile butadiene rubber (IRHD: 78~75), as well as polyurethane isolation rings (IRHD: 80~85), which effectively protect the blade during export and handling.
What materials are used for blade bushings and what is their hardness?
Blade bushings are commonly made from S45C, S50C, and 65Mn, with S45C being the most widely used material. After forging, machining, heat treatment, and leveling grinding, the hardness reaches 47 ± 2 HRC. The thickness tolerance of the blade bushing is controlled within ± 0.003mm/mt.
What is the available thickness range for blade sleeves?
Blade sleeve thickness is available from 0.9mm to 100mm. The sleeve is used to set precise widths between the dividing round knife, upper knife, and lower knife, and to facilitate horizontal gap adjustment during slitting operations.
Do you offer lightweight aluminum spacer alternatives to blade sleeves?
Yes. To reduce overall tool weight, we offer aluminum spacers manufactured using AL7075 material. These aluminum spacers maintain the same high precision standard, with thickness tolerance also controlled within ± 0.003mm/mt.
