RexrothR162121420Ball Runner Block – Size 25, Slimline Normal Length High Body, 86.2 x 48 x 33.9 mm, C1 Light Preload, Accuracy Class N

Product Description

What this part is:

Bosch Rexroth R162121420, designation KWD-025-SNH-C1-N-1, is a size 25 ball runner block for the Rexroth Ball Rail System, a profiled-rail linear guide. Size: 25. Design: SNH, slimline width, normal length, high body. Preload Class: C1, light preload. Accuracy Class: N, Normal. Body Material: Carbon steel. Rolling Elements: Recirculating steel balls, four ball circuits. Ball Chain: none, balls retained by the block’s plastic retainers. Seals: SS standard. Self-Alignment: none, a rigid block. Lubrication: pre-lubricated with Rexroth Dynalub 510 bearing grease plus a preservative. A straight lube connection is supplied loose with the block. Unit Quantity: 1 Pc.

Decoding the designation:

R162121420 — the Rexroth material number (MNR) printed on the carton label. R1621 is the runner block family prefix; the companion ball guide rails begin R1605.

KWD — ball runner block, Rexroth Ball Rail System.

025 — size 25, the number that matches the rail.

SNH — body geometry in the order width, length, height: S = slimline width, N = normal length, H = high body.

C1 — preload class C1, the light preload class.

N — accuracy class Normal.

1 — ball-retention option without a ball chain.

CS — carbon steel body, as printed on the carton (KUGELWAGEN CS / B.RUNNER BLOCK CS).

Specifications:

Size: 25. Overall Length of Runner Block: 86.2 mm. Width of Runner Block: 48 mm. Height of Runner Block: 33.9 mm. Dynamic Load Capacity C: 28,600 N. Static Load Rating C0: 35,900 N. Dynamic Torsional Moment Capacity Mt: 410 Nm. Dynamic Longitudinal Moment Capacity ML: 290 Nm. Static Torsional Moment Capacity Mt0: 510 Nm. Static Longitudinal Moment Capacity ML0: 360 Nm. Maximum Acceleration a max: 500 m/s². Coefficient of Friction: 0.002 to 0.003. Permissible Ambient Temperature: −10 °C to +80 °C. Dynamic load capacity C and the moment capacities Mt and ML are calculated on a 100,000 m stroke life per DIN ISO 14728-1. All figures are Bosch Rexroth configurator data for material number R162121420.

Dimensions and mounting:

Height of Runner Block with Guide Rail: 40 mm. Guide Rail Hole Pitch T: 60 mm. Slimline blocks are through-bolted from above rather than flange-mounted. The carton holds one block in its poly bag, the Rexroth instruction leaflet R320103184 (2015-02 revision) and one loose straight grease nipple; the carton label reads 1 Stück/Pcs.

Compatibility and replacement:

Mating Rail: Bosch Rexroth size 25 profiled ball guide rail, R1605 family, accuracy class N. Rexroth states that runner blocks and guide rails combine as desired within each accuracy class. Material number R162121420 and designation KWD-025-SNH-C1-N-1 identify the same part.

Frequently asked questions:

What does KWD-025-SNH-C1-N-1 mean?

KWD is the Rexroth ball runner block, 025 is size 25, SNH is slimline width, normal length, high body, C1 is light preload, N is accuracy class Normal and 1 is the version without a ball chain.

What are the load ratings of the R162121420?

Dynamic load capacity C is 28,600 N and static load rating C0 is 35,900 N, per Rexroth configurator data.

Which guide rail does the R162121420 run on?

A Bosch Rexroth size 25 ball guide rail from the R1605 family, accuracy class N, with 60 mm hole pitch.