The NSK W2503SA-1P-C5Z4 is a model number of the NSK SA series shaft-end finished flange type ball screw. "25" indicates the screw diameter is 25 mm, and "4" indicates the lead is 4 mm. The W2503SA-1P-C5Z4 ball screw adopts a return tube structure, right-hand thread, and features high precision, low friction, and high rigidity. It is suitable for CNC machine tools, semiconductor equipment, automated positioning platforms, and precision transmission mechanisms.
The NSK W2503SA-1P-C5Z4 SA type pre-finished ball screw features the following characteristics:
It adopts the SA series pre-finished shaft design, with the shaft end pre-machined for direct installation with support units, shortening equipment assembly time;
It uses a tubular circulation structure, resulting in high transmission efficiency, low frictional resistance, smooth operation, and excellent positioning accuracy;
It has a C5 accuracy class, stable repeatability, and is suitable for automated equipment, precision machinery, and CNC systems;
It is equipped with a sealing structure to effectively prevent dust and foreign matter from entering, improving service life and reliability;
It features a standardized product design, short delivery cycle, and easy maintenance and replacement.
Item |
Specification |
Model No. |
W2503SA-1P-C5Z4 |
Series |
Shaft End Finished Product |
Type |
SA |
Screw Shaft Diameter [mm] |
25 |
Lead [mm] |
4 |
Accuracy Grade |
C5 |
Ball Diameter [mm] |
2.381 |
Valid Number of Laps |
2.5×2 |
Nut Length [mm] |
48 |
Maximum travel [mm] |
316 |
Screw Length (Lt) [mm] |
370 |
Screw Length (La) [mm] |
400 |
Screw Length (L) [mm] |
499 |
Weight [kg] |
2.2 |
Rated Dynamic Load [N] |
7110 |
Rated Static Load [N] |
13600 |
Maximum Speed [Fixed-Free] (min-1) |
2800 |
Drive Side Support Unit |
WBK20-01A(Square) WBK20-11(Round) |
Reverse Drive Side |
WBK20S-01(Square) |

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