RexrothR167122310Wide Ball Runner Block – Size 25/70, Four Ball Rows, C2 Medium Preload, H Accuracy, Carbon Steel

Product Description

What this part is

Bosch Rexroth ball runner block KWC-025-BNS-C2-H-2, material number R167122310, from the wide ball rail system range. Product Type: ball runner block, carbon steel. Size: 25/70. Design: BNS, wide flange, normal length, standard height. Ball Rows: four, in an O-arrangement. Preload Class: C2, medium. Accuracy Class: H, high precision. Sealing: integrated all-round sealing, standard SS seals. Bearing Material: carbon steel.

Decoding the designation

KWC — Rexroth’s ball runner block designation for the wide-flange block, carbon steel, without ball chain.

025 — size 25, running on the 70 mm wide rail of the wide series.

BNS — wide, normal length, standard height.

C2 — medium preload.

H — high-precision accuracy class.

2 — the seal and lubrication execution within the size.

What these specs mean in practice

Ball Rows: four, in an O-arrangement. That geometry takes load from every transverse direction and moments about all three axes with the same block, so a single carriage can carry an overhung tool head without a second guide to react the moment.

Preload Class: C2, medium. Preload removes clearance from the ball tracks, so the carriage deflects less under a reversing load and holds position better than a clearance-set block. Medium preload is the usual choice where rigidity matters more than the lowest possible friction.

Accuracy Class: H, high precision. That tightens the height and lateral tolerances of the block over the rail, which is what a machine tool or measuring axis is bought on.

Sealing: integrated all-round sealing keeps swarf, coolant and grit out of the ball tracks, which is the failure mode that ends a runner block’s life in a machining environment.

Mounting data

Block Width: 120 mm. Block Length: 105 mm. System Height: 35 mm. Block Height: 29.75 mm. Rail Width: 80 mm. Mounting Hole Pattern: 107 mm by 60 mm. Mounting Thread: M8. Mounting Hole Diameter: 7 mm. End Face Thread: M3. Lubrication Nipple: DIN 71412-A M6 x 8, connectable from any side.

Quantity and configuration

Unit Quantity: 1 Pc. One ball runner block, supplied on its own.

Interchange guidance

Material number R167122310 and type code KWC-025-BNS-C2-H-2 identify the same block. Searchable variants of the number: R-167-122-310, R 167 122 310, R167 122 310, KWC-025-BNS-C2-H-2, KWC 025 BNS C2 H 2, KWC025BNSC2H2.

R167122320 is the same 25/70 wide geometry in the KWD execution at C2 preload and H accuracy, and R167131310 is the KWC block with the ball chain fitted — same rail, different block execution.