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Diameter Micro Ball Screw
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Product: Views:287Diameter Micro Ball Screw 
Unit price: Negotiable
Delivery date: Since the payment date Days delivery
Valid until: Long-term effective
Last updated: 2019-07-15 00:00

Combination of Shaft nominal dia.& lead unit:mm

Shaft dia.























● Accuracy Grade & Axial play

Accuracy grade of SG series (Standardized Precision Ball Screws) are based on JIS C3 and JIS C5. According to accuracy grade, Axial play 0(Preload: C3) and 0.005mm or less (C5) are in stock.

● Material & Surface hardness

SG series (Standardized Precision Ball Screws) consists of Shaft and Nut materials SCM415

(Carburizing and quenching) and Surface hardness is HRC58~62.

● Lubrication

SG series(Standardized Precision Ball Screws) without end-journal machining will be applied with anti-rust oil for rust prevention.

Anti-rust oil does not have lubricating function so that please apply Grease or lubrication oil when using the Ball Screws.

If there is no specific instruction, KSS would recommend our original Grease (MSG No.2) as standard lubricant.

Please feel free to contact us.

Product parameters

SG0300.5 Shaft dia. φ3 Lead 0.5mm

Ball size:φ0.4

Number of thread:1

Thread direction:Right

Shaft root dia.:φ2.6

Number of circuit:2.7*1

Shaft, Nut material:SCM415H

Surface hardness:HRC58~62(Thread area)

Anti-rust treatment:Anti-rust oil


Lead accuracy:±0.008



Supported-side end-journal profile:Can be customized

Factory information:

Ball screw factory is located in beautiful ningbo dongqian lake yuyuan road, there are more than 30 processing specially with master, sales staff more than 10. The factory covers an area of more than 1,000 square meters, the use area of more than 2,000 square meters. With three axis wire rolling machine, lathe, external thread grinder, cylindrical grinder, straightening table, laser cutting machine, fine carving machine, processing center, bending machine, sandblasting machine and other equipment.

Production range: cold rolling ball screw, screw diameter 12mm-50mm. Production model reference template: TBI/HIWIN. Main product series: SFU/SFS/DFU. Product accuracy C7. Support custom drawing.

Cooperative brands: KSS, KGG. As partners, we sell the company's products as agents. Includes miniature ball screw. Mini screw screw diameter of 3 mm / 4 mm / 5 mm / 6 mm / 8 mm / 10 mm. Main products series is SG/MRB series. Product accuracy C3/C5/C7. Support custom drawing.

Industry knowledge:

Ball screw is an ideal product for converting rotary motion into linear motion or linear motion into rotary motion. Ball screw consists of screw, nut and ball. Its function is to convert the rotating motion into linear motion, which is the further extension and development of the ball screw. The significance of this development is to change the bearing from rolling motion to sliding motion. Due to its low friction resistance, ball screw is widely used in various industrial equipment and precision instruments. Ball screw is the most commonly used driving element in tool machine and precision machine. Its main function is to convert rotary motion into linear motion or torque into axial repeated force. Meanwhile, it has the characteristics of high precision, reversibility and high efficiency.

Processing process:

1. Raw screw rod shall be blanked by cutting machine and annealed by tempering machine (namely high-frequency heating equipment) according to processing requirements of screw shaft end.

2. After annealing and cooling, the straight machine can roughly adjust the lead screw to ensure that the lead screw runout is controlled within the required range.

3, After straightening the lathe coarse car, according to the actual situation to leave a certain precision margin.

4, After the coarse car fine calibration, ensure that the screw beat control in a more accurate range.

5, Fine calibration, lead screw center drilling, and then fine turning to the drawing requirements or external grinder grinding processing to the drawing requirements.


1. Can the screw be customized?

Screw can be customized, nut model, shaft end processing, screw length, screw brand can be customized.

2. Screw processing technology?

Cold rolling and grinding. According to customer requirements, meet customer requirements for production

3. Moq?

1 the root up the order

4. Are free samples provided?

Samples are not provided free of charge

5. Mode of transportation?

We can choose any mode of transportation by sea, air or rail, only with your permission.

6. Terms of payment?

You can choose any payment method you like. If we don't have that kind of payment account, we'll sign up and open it.

7. What should I do if I receive defective products?

You will not receive inferior goods. There are three inspection procedures for our products. If you have a 1 in 10,000 chance of receiving an inferior product, congratulations, we will give you free qualified products.


1. Our products are guaranteed for one year without any artificial damage

2. Before you purchase, you can provide us with processing drawings. If you do not know how to make drawings, we will make and process drawings for you free of charge and confirm the drawings with you for processing.

3. After you receive the product, you can conduct testing. If problems are found, we will be responsible for you.

4. If you need to add your Logo, we are willing to serve you as long as the product quantity is enough.

5. Delivery time: 20 working days

6. Price: our quotation is ex-factory price, and you need to bear the freight by yourself.