6-Row Ball Circuit

Six ball rows versus three in the standard series — approximately doubles dynamic and static load ratings without increasing bore size or shaft diameter.

Combined Motion

Enables simultaneous linear travel along the shaft axis and rotation around the shaft axis — identical capability to the standard ST series but at twice the load capacity.

Nickle-Plated Option

All ST...B models can be supplied with nickel plating for corrosion resistance in humid or mildly aggressive environments.

Defined Maximum Stroke

Each model has a rated maximum stroke listed in the specification table. Motion must be controlled to remain within this limit to prevent ball circuit overrun.

GCr15 Chrome Steel

Through-hardened to HRC 58–64. Both linear and rotary bearing surfaces precision-ground. Phosphate coating standard; nickel plating on request.

13 Bore Sizes

Available from 6 mm to 100 mm bore for heavy-duty combined-motion applications across the full industrial shaft diameter range.

Heavy-Duty Cam Mechanisms

High-force cam followers and eccentric drives requiring combined linear and rotary motion use the ST...B series when the standard ST load rating is insufficient for the target life at the application load level.

Industrial Pick-and-Place

Heavy-payload robotic pick-and-place heads requiring simultaneous vertical linear travel and part rotation use the ST...B series for its increased moment-load resistance.

Hydraulic Rotary-Linear Actuators

Hydraulic actuators that combine linear extension with rotary output require high load capacity in the linear bearing element — the ST...B 6-row configuration meets this requirement.

Precision Machine Tools

Combined linear-rotary axes in grinding machine dressing heads and honing tools use ST...B bearings for the load capacity needed to maintain geometric accuracy under cutting forces.

🔎 Shaft Specification

Ground to h6/h7 tolerance, HRC 60+ hardness, Ra 0.4 µm. The six ball rows increase the total shaft contact load — shaft hardness is even more critical than in the standard ST series.

🔧 Stroke Limit Compliance

The ST...B maximum stroke is shorter than the standard ST for the same bore due to the longer ball circuit. Check the specification table for the correct stroke limit before programming motion limits.

📈 Re-Lubrication

NLGI-2 grease. Re-lubricate every 300 km of combined linear travel. The higher load capacity of the ST...B series does not extend re-lubrication intervals — the additional ball rows increase grease consumption proportionally.

⚙ Housing Fit

Housing bore H7 tolerance. The larger outer diameter D of the ST...B (compared with standard ST for the same bore) must be reflected in the housing design. Verify against the specification table before machining.

①

Identify Application Type

Confirm combined linear and rotary motion is required. Verify that the standard ST load rating is insufficient before upgrading to ST...B.

②

Select Bore & Model

Match bore to shaft nominal diameter. Note that ST...B maximum stroke is shorter than standard ST — verify against specification table.

③

Verify Load & Life

Calculate L10 using ST...B load rating C and equivalent load P. The ST...B should comfortably exceed the target life with a safety margin of at least 2×.

④

Contact Us

MOQ 100 units. Contact our team with engineering drawings specifying bore, housing, load case, stroke, and target life.

📞 Ready to Order?

MOQ is 100 units per model. Provide engineering drawings with bore, housing bore tolerance, load case, stroke, speed, and target service life. All catalogue data is for reference only.