Rolled Ball Screws Shaft Dia.8 Lead 2 Accuracy Grade C7
Brand :
MISUMI
Caution
Product Description
- Rolled Ball Screws Shaft Dia.8 Lead 2 Accuracy Grade C7 from MISUMI.
- The Rolled Ball Screws have a shaft diameter of 8 mm and lead size is 2mm.
- The accuracy grade option for this product is C7.
- The overall length of the shaft screw can be customized to fit a range of configurations, from 100mm to 400mm, in 1mm increments.
- The lead twisting direction for this product is right-handed.
- The screw shaft is made of S55C while the nut is made of SCM420.
Economy Rolled Ball Screw
Precision Customizable Durable
- High precision C7 grade for accurate positioning
- Customizable shaft length within a specified range
- Durable S55C/SCM420 material
- Ideal for feeding mechanisms and multi-point positioning
- Cost-effective without compromising quality
MISUMI Standard
Cheaper Price
Product Variety
3D CAD Support
Product Overview
Product Comparison
| Model No./Specification Example | |||||
| Model No. | Accuracy | Shaft Dia. | Lead | Total Length | |
| MISUMI Conventional Standard Product | BSST0802-300 | C7 | 8 | 2 | 300 |
| MISUMI Conventional C-Value Product | C-BSST0802-300 | ||||
| Economy Series* | C-TBSE0802-300 | ||||
■ Lead Accuracy
■ Cumulative Lead Error Tolerance
(4) Lead error tolerance value for an arbitrary datum length of 300mm within the effective thread length of the screw shaft
*Lead accuracy is reference for accuracy class C7.
Mounting part accuracy differs from MISUMI conventional products
See ■ Mounting Part Accuracy below
| Accuracy Class | C7 | C10 |
| Cumulative Lead Error (4) | 52 | 210 |
*Lead accuracy is reference for accuracy class C7.
Mounting part accuracy differs from MISUMI conventional products
See ■ Mounting Part Accuracy below
■ Mounting Part Accuracy
Rolled Ball Screw
Unit: mm
*Varies by lead
| Model | Lead | Screw Length | (1) (2) Runout Tolerance (Max.) | (3) Runout Tolerance (Max.) | (4) (5) Perpendicularity Tolerance (Max.) | Axial Clearance | ||||||
| Type | Screw Shaft Outer Dia. | Min. | Max. | Conventional Product (BSST) | Economy Series | Conventional Product (BSST) | Economy Series | Conventional Product (BSST) | Economy Series | Conventional Product (BSST) | Economy Series | |
| C-TBSE | 8 | 2 | 100 | 400 | 0.014 | 0.027 | 0.014 | 0.027 | 0.007 | 0.009 | 0.03 or less | 0.05 or less |
| 10 | 2/4 | 150 | 600 | |||||||||
| C-TBSE C-TBSB | 12 | 4/5/10 | 150 | 800 | 0.1 or less | |||||||
| 15 | 5/10/16/20 | 150 | 1200 | |||||||||
| 20 | 5/10/20 | 200 | 2000 | 0.05 or less* | 0.15 or less | |||||||
| 25 | 5/10/25 | 200 | 2000 | 0.02 | 0.04 | 0.02 | 0.04 | 0.07 or less* | 0.2 or less | |||
| 32 | 5/10/32 | 300 | 2000 | 0.008 | ー | |||||||
| (1)・(2) | Radial run-out of bearing mouting surface related to the centerline of screw groove. This measurement item is affected by Total Run-out (8) of the Screw Shaft, and so it must be corrected. |
| (3) | Radial run-out of drive component interface surface in relation to screw shaft support axis. |
| (4)・(5) | Perpendicularity of shaft's bearing shoulders in relation to screw shaft support axis. |
Product Features
■Short Lead Time
・Eliminate drawing processing and save design time; ships as fast as 6 days after ordering
■Quality Assurance
・Even for MISUMI Economy series, pre-shipment quality inspections are conducted just like MISUMI Standard products to provide items that meet catalog specifications
・Eliminate drawing processing and save design time; ships as fast as 6 days after ordering
■Quality Assurance
・Even for MISUMI Economy series, pre-shipment quality inspections are conducted just like MISUMI Standard products to provide items that meet catalog specifications
Example of Use
Related Products
| Economy Series Support Units - Standard Square Type | Economy Series Support Units - Round Type | ||
| Fixed Side Model | Supported Side Model | Fixed Side Model | Supported Side Model |
 |  |  |  |
Precautions
■Precautions for Selection and Use
●Rotating the nut by hand may not feel smooth, but does not affect the positioning accuracy, so this product is suitable for multi-point positioning feeding mechanism. Please feel free to use.
●If low runout is required during operation (e.g., machining equipment), please use MISUMI Standard products.
●During operation, if excessive noise or sharp, piercing sounds occur, please be sure to confirm the installation accuracy of the screw and whether the specifications of peripheral components such as motors and couplings are appropriate. MISUMI does not guarantee the noise level after the screw is assembled.
●Although lithium soap-based grease is applied at the factory, new grease should be injected every 2 to 3 months after receipt as a standard, otherwise performance will be affected.
●Do not allow the nut to exceed the ball screw nut travel range or screw it off the screw shaft, as this will cause balls to fall out and damage ball circulation parts.
●Please note that placing the ball screw and nut at an incline may cause them to fall due to their own weight.
●This product is a machined type, so there will be knife patterns and color difference in its appearance. Small scratches or color changes without affecting the use and main function are of a normal phenomenon. Please feel free to use.
■Precautions for Design and Assembly of Ball Screws and Peripheral Parts
A ball screw is a component that only bears axial loads. If it is subjected to radial loads or moment loads, it may lead to poor sliding, vibration, and abnormal noise, thereby shortening the service life.
The causes of radial and moment loads on ball screws are axial deviation and parallelism errors of surrounding components. Therefore, to prevent errors, peripheral parts of the ball screw must be correctly designed and assembled.
●Axial misalignment between the ball screw and the support unit assembly (Fig. 1)
-Axial deviation refers to the deviation between the axis of the ball screw fixed by the fixed-side support unit and the axis of the bearing in the supported-side support unit.
-Allowable axial deviation value: 20μ or less (reference value)
●Parallelism between the ball screw and the linear guide (Fig. 2)
-Parallelism error refers to the vertical or horizontal tilt of the ball screw relative to a reference such as a linear guide.
-Allowable tilt value: 1/2000 or less (Fig. 3)
●Precautions during Assembly
If abnormal noise is detected during ball screw operation or if sticking occurs during movement after assembly, please loosen the connections of each component to adjust, and reassemble after smooth movement is achieved.
-Error in the horizontal direction of the support unit (Fig. 1)
-Parallelism error between the linear guide and the ball screw (Fig. 2)
-Fixing of the worktable and the nut bracket
-Fixing of the ball screw nut and the nut bracket
●Rotating the nut by hand may not feel smooth, but does not affect the positioning accuracy, so this product is suitable for multi-point positioning feeding mechanism. Please feel free to use.
●If low runout is required during operation (e.g., machining equipment), please use MISUMI Standard products.
●During operation, if excessive noise or sharp, piercing sounds occur, please be sure to confirm the installation accuracy of the screw and whether the specifications of peripheral components such as motors and couplings are appropriate. MISUMI does not guarantee the noise level after the screw is assembled.
●Although lithium soap-based grease is applied at the factory, new grease should be injected every 2 to 3 months after receipt as a standard, otherwise performance will be affected.
●Do not allow the nut to exceed the ball screw nut travel range or screw it off the screw shaft, as this will cause balls to fall out and damage ball circulation parts.
●Please note that placing the ball screw and nut at an incline may cause them to fall due to their own weight.
●This product is a machined type, so there will be knife patterns and color difference in its appearance. Small scratches or color changes without affecting the use and main function are of a normal phenomenon. Please feel free to use.
■Precautions for Design and Assembly of Ball Screws and Peripheral Parts
A ball screw is a component that only bears axial loads. If it is subjected to radial loads or moment loads, it may lead to poor sliding, vibration, and abnormal noise, thereby shortening the service life.
The causes of radial and moment loads on ball screws are axial deviation and parallelism errors of surrounding components. Therefore, to prevent errors, peripheral parts of the ball screw must be correctly designed and assembled.
●Axial misalignment between the ball screw and the support unit assembly (Fig. 1)
-Axial deviation refers to the deviation between the axis of the ball screw fixed by the fixed-side support unit and the axis of the bearing in the supported-side support unit.
-Allowable axial deviation value: 20μ or less (reference value)
●Parallelism between the ball screw and the linear guide (Fig. 2)
-Parallelism error refers to the vertical or horizontal tilt of the ball screw relative to a reference such as a linear guide.
-Allowable tilt value: 1/2000 or less (Fig. 3)
●Precautions during Assembly
If abnormal noise is detected during ball screw operation or if sticking occurs during movement after assembly, please loosen the connections of each component to adjust, and reassemble after smooth movement is achieved.
-Error in the horizontal direction of the support unit (Fig. 1)
-Parallelism error between the linear guide and the ball screw (Fig. 2)
-Fixing of the worktable and the nut bracket
-Fixing of the ball screw nut and the nut bracket
