NSK70BA10XTYDBLP4ABall Screw Support Bearing Set 70x110x18 mm, DB Back-to-Back, Light Preload, P4A Class, Phenolic Cage

Product Description

What this part is

NSK 70BA10XTYDBLP4A ball screw support bearing set. Brand: NSK. Designation: 70BA10X-TY-DBL-P4A. Series: BA, ball screw support. Bore: 70 mm. Outside Diameter: 110 mm. Overall Width: 18 mm per bearing. Design Units: Metric. Cage Material: Phenolic (synthetic resin). Mounting Arrangement: DB, back-to-back. Preload: Light. Precision Class: P4A, in the P4 (ABEC 7) band. Unit Quantity: 2 Pcs.

Decoding the designation

70: bore in millimetres — NSK numbers the BA series by actual bore rather than by ISO bore code. BA: ball screw support series. 10X: series and variant code within the BA range. TY: phenolic cage. DBL: DB back-to-back mounting with L light preload, supplied as a matched pair. P4A: NSK precision class in the P4 (ABEC 7) band. The primary part number is the DBL form; DUL is retained as a search term.

What these specs mean in practice

The BA range is a dedicated ball screw support series, built for high axial load and high axial stiffness in a shallow section rather than for a balance of radial and axial capacity. The thrust reaction of the screw passes through these bearings, and axial deflection in them appears as lost motion at the machine’s tool point, so axial stiffness governs the positioning accuracy of the whole axis. Back-to-back mounting gives the widest effective bearing spread and the best resistance to the moment loads a long screw imposes. Light preload keeps friction, heat and drive torque low, which suits a screw that reverses frequently and an axis whose accuracy is sensitive to thermal growth. The phenolic cage is self-lubricating and oil-absorbing, and is gentler on the balls than pressed steel during momentary lubricant starvation.

Quantity and configuration

Unit Quantity: 2 Pcs. The sale unit is one matched back-to-back pair, ground as a set with the light preload built into the ring faces.

Interchange guidance

Match within the BA series on bore size, preload grade and precision class. Dedicated ball-screw support bearings from other makers include FAG’s 7602 series 60° designs, matched on contact angle and axial stiffness rather than on envelope. Listing search forms: 70BA10XTYDBLP4A, 70BA10X-TY-DBL-P4A, 70BA10XTYDULP4A, 70BA10X.