Material

• Hard Steel with resin (plastic) ball retainer.

Options

• Available with seals subject to minimum order quantities.
• Precision short miniature linear bearings available; ØB Tolerance: +0 -0.5μm, ØD Tolerance: +0 -0.7μm. Max Eccentricity: 2μm.

Other Info.

No. of Ball Races: 4.
As the external cylinder is thin, use epoxy type adhesive agent for fixing to the housing hole, instead of press-fitting.
Recommended Fit: Shaft (58-64 HRC) = -6 μm to -14 μm. Housing = +12 μm to -0 μm.Precision Fit (POA): Shaft (58-64 HRC) = -4 μm to -9 μm. Housing = +8 μm to - 0 μm.
Recommended Surface Hardness: 58-64 HRC, Surface Roughness: 0.2 μmRa or lower (0.8 μmRy or lower), Effective Hardening Depth: 0.8 mm or higher.
Compatible with Z-A and Z-B type shafting (all over h6 tolerance - polishing down may be required to achieve running tolerance).

Notes:
Dimension tolerances are μm
Linear bearing units support only linear and not rotational motion.
When performing rotational motion and linear motion of short stroke length, the use of Stroke Rotary Bushing (ST-UU) is recommended.
When inserting a shaft to the external cylinder, be careful not to let the shaft pried open as it may cause dropping of balls or deformation of the retainer.
The load rating varies according to the loading direction and position of ball raceway. The dimension table describes two types of values shown in Fig. 1.1 and Fig. 1.2 according to the loading direction and position of ball raceway.
Fig. 1.1 shows the case where the loading direction and ball raceway position coincides with each other, representing the loading direction A in the dimension table. Generally, this is applied when the ball raceway position cannot be specified to indeterminate direction load or loading direction.
Fig. 1.2 shows the case where the loading direction is positioned between ball raceways, representing the loading direction B in the dimension table. Generally, this can be subjected to load bigger than loading direction A.