25mm Shaft for Linear Bearings

What "25 mm" means at the bearing contact

A nominal diameter identifies the shaft size, but the tolerance determines the permitted finished diameter. Guangyuan's catalogue lists a g6 deviation of −7 to −20 μm for the 25 mm model. This corresponds to a shaft diameter between 24.980 and 24.993 mm, rather than an unrestricted 25 mm bar.

That controlled diameter matters because the bearing balls run directly on the shaft. Variation in the running surface changes the bearing fit as it travels. The shaft tolerance must work with the selected bearing's specification; g6 alone does not establish the clearance or preload of the complete assembly.

The 25mm Shaft for Linear Bearings is listed under WC25 and WCS25. The catalogue identifies the S version as chrome plated. The following values relate to the 25 mm size and the GCr15 specification shown on the sheet.

Hardness below the surface

The hardened layer is important because repeated ball contact loads the shaft surface locally. The catalogue specifies an effective hardened depth of at least 1.5 mm for this diameter. This describes the depth of the hardened steel region, not the thickness of the chrome coating.

Chrome plating and heat treatment therefore serve different roles in the specification. The plated version has an additional surface finish, while the hardness and hardened-depth values describe the treated steel. A polished appearance cannot demonstrate either property, and neither should be inferred from the product photograph alone.

The sheet also limits roundness to 0.003 mm. Roundness concerns the shape of a shaft cross-section; it is separate from diameter tolerance and does not describe how straight the entire shaft is. These distinctions matter when a long bearing travel must maintain a consistent fit.

The 25mm Shaft for Linear Bearings remains a separate component from its supports and bearing housings. In an end-supported arrangement, the unsupported span affects bending under load even when the shaft diameter and surface specification are correct. Increasing travel length without reconsidering support spacing can therefore change the behaviour of the same shaft size.

End threads, tapped holes or reduced sections provide mounting connections, but they belong outside the bearing's working path. The cylindrical running section must remain suitable for continuous bearing contact throughout the intended stroke.

About Us

Lishui Guangyuan Industry & Trade Co., Ltd. produces linear shafts, bearings, shaft supports and related motion components.

We supply shafts cut to the required length and offer drawing-based machining, including external threads, axial and radial tapped holes, reduced ends, flats, keyways and retaining-ring grooves. OEM/ODM production is available, with a minimum order quantity of 10 shafts. Bearings and supports can be quoted separately when required.

Hot Tags: 25mm Shaft for Linear Bearings, China25mm Shaft for Linear Bearings suppliers, manufacturers, factory, 8mm Linear Shaft, Chrome Linear Shaft, Hollow Linear Shaft, Linear Guide Shaft, Linear Motion Ball Bearing Slide Bushing, Linear Shaft 10mm