Recirculating ball linear bearing HRW series

self-aligningball bearingstainless steel

Overview
This LM Guide model features a low center of gravity due to its wide rail and low overall height. It is suitable for single-rail use where a compact layout or high rigidity against applied moments is required.

Highlight tags

• High accuracy
• Self-adjusting capability
• Miniature
• Wide

Available sizes
12, 14, 17, 21, 27, 35, 50, 60

Types / Model groups

• Models HRW-CA / HRW-CAM — Flange type, bolts mounted from above and below. Basic dynamic load rating: 5.53 to 80.3 kN. Basic static load rating: 9.1 to 109 kN. Sizes: 17, 21, 27, 35, 50, 60.
• Models HRW-CR / HRW-CRM — Bolts mounted from above. Basic dynamic load rating: 5.53 to 62.4 kN. Basic static load rating: 9.1 to 86.3 kN. Sizes: 17, 21, 27, 35, 50.
• Model HRW-LRM — Low-height type. Basic dynamic load rating: 3.29 to 5.38 kN. Basic static load rating: 7.16 to 11.4 kN. Sizes: 12, 14.

Structure and features
Balls run in four rows of precision-ground raceways on the LM rail and LM block; end plates in the LM block allow ball circulation. Retainer plates keep balls in place even if the LM block is removed from the rail (except models HRW 12 and 14LR). Each ball row is set at a 45° contact angle, providing uniform load ratings in four directions (radial, reverse-radial, lateral). The LM block can receive a well-balanced preload to increase rigidity in four directions while maintaining low friction. The wide LM rail with low center of gravity and low overall height enables single-axis applications where space is limited or where high rigidity for moment loads is required.

Compact with Large Load Capacity
Due to the large number of load-bearing balls, the model provides high rigidity in all directions. The wide LM rail supports moment loads in single-rail configurations and has a large secondary cross-sectional moment of inertia, delivering high lateral rigidity without side supports.

Self-Adjustment Capability
The front-to-front configuration of circular-arc grooves (DF set) provides self-adjustment capability that absorbs mounting error even under preload, achieving smooth and highly accurate linear motion.

Dimensional summary — Table 1: Standard lengths and maximum lengths (unit: mm)
Header: LM rail standard length (L_O) / Standard pitch F / G, g / Max length
HRW 12: 70 / 110 / 150 / 190 / 230 / 270 / 310 / 390 / 470 ; F = 40 ; G,g = 15 ; Max length: (1,000)
HRW 14: 70 / 110 / 150 / 190 / 230 / 270 / 310 / 390 / 470 / 550 / 670 ; F = 40 ; G,g = 15 ; Max length: (1,430)
HRW 17: 110 / 190 / 310 / 470 / 550 ; F = 40 ; G,g = 15 ; Max length: 1,900 (800)
HRW 21: 130 / 230 / 380 / 480 / 580 / 780 ; F = 50 ; G,g = 15 ; Max length: 3,000 (1,000)
HRW 27: 160 / 280 / 340 / 460 / 640 / 820 ; F = 60 ; G,g = 20 ; Max length: 3,000 (1,200)
HRW 35: 280 / 440 / 760 / 1,000 / 1,240 / 1,560 ; F = 80 ; G,g = 20 ; Max length: 3,000 (2,120)
HRW 50: 280 / 440 / 760 / 1,000 / 1,240 / 1,640 / 2,040 ; F = 80 ; G,g = 20 ; Max length: 3,000
HRW 60: 570 / 885 / 1,200 / 1,620 / 2,040 / 2,460 ; F = 105 ; G,g = 22.5 ; Max length: 3,000

Notes (excerpted)

• Length L shown in dimension tables is the length with contamination protection accessories (codes such as UU or SS); other accessories increase total block length.
• Maximum lengths shown are standard maximum lengths for LM rails; rails longer than these are produced by joining rails.
• The basic load rating is for radial loads; use equivalent-load calculation methods for reverse-radial or lateral loads. Values differ for models 12 and 14.
• Model symbol "M" indicates stainless-steel LM block, rail, and balls for corrosion/environmental resistance.

Technical specifications

• Series: HRW
• Type: Full-ball LM Guide, wide-rail, low overall height
• Model variants: HRW-CA / HRW-CAM, HRW-CR / HRW-CRM, HRW-LRM
• Available sizes (rail width variants): 12, 14, 17, 21, 27, 35, 50, 60
• Balls: Four-row ball circulation with retainer plates; contact angle 45°
• Preload: Can receive well-balanced preload to increase rigidity while maintaining low friction
• Basic dynamic load rating (examples by variant): HRW-CA/CAM 5.53–80.3 kN; HRW-CR/CRM 5.53–62.4 kN; HRW-LRM 3.29–5.38 kN
• Basic static load rating (examples by variant): HRW-CA/CAM 9.1–109 kN; HRW-CR/CRM 9.1–86.3 kN; HRW-LRM 7.16–11.4 kN
• Standard pitch F by size group: see table (40, 50, 60, 80, 105 mm depending on size)
• Tapped-hole LM rail type: available for certain sizes (tap details differ by model)
• Maximum standard rail lengths vary by size (see table); stainless-steel models may have different maximums shown in parentheses
• Grease nipple / grease specifications and LM block/rail mass values included in dimensional tables