The NSK W2803SA-2Z-C5Z5 is a tubular recirculating ball screw with a diameter of 28 mm, a lead of 5 mm, and a total length of approximately 500 mm. It features a right-hand thread design, adopts a C5 precision grade, and possesses high precision, low backlash, and high-efficiency transmission characteristics.
The NSK SA type ball screw is a precision-ground standard ball screw. Its core feature is that the shaft end has been precision-machined, which can be directly installed with NSK standard support units without the need for secondary machining of the shaft end by the user, greatly shortening the assembly cycle.
Features of W2803SA-2Z-C5Z5 Preloaded Ball Screw:
High-Precision Transmission: Utilizes C5 precision grade, achieving high repeatability and suitable for precision machining equipment.
High-Efficiency Design: Low ball circulation friction results in significantly higher transmission efficiency than traditional sliding screws, reducing drive energy consumption.
High-Rigidity Structure: The SA type structure provides excellent axial rigidity, capable of withstanding high loads and improving equipment machining stability.
Low-Noise Operation: Optimized ball circulation method ensures smoother and quieter operation.
Standardized Installation: A-Series standardized shaft end design facilitates installation with support units and servo systems.
Common Applications of W2803SA-2Z-C5Z5 Precision Ball Screws
CNC Machine Tools
Industrial Robots
Precision Conveying Machinery
Electronic Manufacturing Equipment
Item |
Specification |
Model No. |
W2803SA-2Z-C5Z5 |
Series |
Shaft End Finished Product |
Type |
SA |
Screw Shaft Diameter [mm] |
28 |
Lead [mm] |
5 |
Accuracy Grade |
C5 |
Ball Diameter [mm] |
3.175 |
Valid Number of Laps |
2.5×2 |
Nut Length [mm] |
86 |
Maximum travel [mm] |
278 |
Screw Length (Lt) [mm] |
370 |
Screw Length (La) [mm] |
400 |
Screw Length (L) [mm] |
499 |
Weight [kg] |
3.2 |
Rated Dynamic Load [N] |
20600 |
Rated Static Load [N] |
48700 |
Maximum Speed [Fixed-Free] (min-1) |
2500 |
Drive Side Support Unit |
WBK20-01(Square) WBK20-11(Round) |
Reverse Drive Side |
WBK20S-01(Square) |

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