RexrothR162321420Ball Runner Block Size 25, Slimline Long SLS Carriage 107.9 x 48 x 36 mm, Preload Class C1

Product Description

What this part is

Bosch Rexroth R162321420 ball runner block, catalogued as KWD-025-SLS-C1-N-1. A runner block is the moving carriage of a profiled rail linear guide: recirculating ball tracks inside the block roll on the ground raceways of a hardened steel ball guide rail. Manufacturer: Rexroth. Part Number: R162321420. Designation: KWD-025-SLS-C1-N-1. Size: 25. Block Form: SLS, slimline, long, standard height. Material: carbon steel. Preload Class: C1, preload 2% C. Accuracy Class: N, normal. Product Family: Rexroth Ball Rail System, SNS and SNO rails.

Decoding the designation

KWD — Rexroth’s code for a ball runner block, the carriage half of a ball rail system.

025 — size 25, the nominal size that fixes which ball guide rail profile the block runs on.

SLS — slimline, long, standard height. A narrow body with a lengthened block, tapped from the top face rather than flanged.

C1 — preload class C1, a preload of 2% of the dynamic load rating C.

N — normal accuracy class.

1 — standard seal execution.

R162321420 — the Bosch Rexroth nine-digit material number. R-162-321-420 and the 1623-214-20 short form are the same number.

What these specs mean in practice

Block Form: SLS. The slimline body keeps the block narrow across the rail, which is what makes it fit an axis with restricted transverse space, and the long body puts more balls under load than a normal-length block, so it carries very high loads and holds the same load rating in all four main directions. An optimised entry-zone geometry and the higher ball count minimise variation in elastic deflection as the block travels, which shows up as steadier position under changing load. Preload Class: C1. A 2% preload takes the free play out of the carriage and raises stiffness while keeping running friction moderate. Accuracy Class: N. Normal accuracy is the standard-tolerance grade for general machine building and factory automation.

Mounting data

Overall Length: 107.9 mm. Block Width: 48 mm. Block Height: 36 mm. Mounting Hole Spacing, transverse: 35 mm. Mounting Hole Spacing, longitudinal: 50 mm. An end-face fastening thread takes the standard range of block attachments, and the block carries integrated all-round sealing. Size: 25 — the block seats on Rexroth SNS and SNO ball guide rails of size 25.

Quantity and configuration

Unit Quantity: 1 Pc. One runner block per listing.

Interchange guidance

R162321420, R162 321 420, R-162-321-420 and the short form 1623-214-20 are the same part, and Bosch Rexroth catalogues it as KWD-025-SLS-C1-N-1. A drawing, parts list or maintenance BOM quoting any of those strings resolves to this runner block.