LM Guide Type HRW – Wide Rail, Four-Way Equal-Load Type End plate End seal Grease nipple LM block Ball Retainer plate Side seal LM rail HRW17~60 HRW12·14 Cross section Fig. 1 Construction of Model HRW Construction and Features Balls roll in four rows of precision-ground raceway on an LM rail and an LM block. The end plate attached to the LM block causes the trains of balls to circulate. As the balls are held in place by the retainer plate, they do not fall off if the LM block is removed from the rail (except for types HRW 12 and 14LR). The four trains of balls are arranged so that the contact angle is 45°, allowing each train of balls to bear an equal load rating in all four directions: radial, reverse-radial, and the two lateral directions. This type can therefore be used in any installation direction. Moreover, type HRW permits the application of a well-balanced preload, making it possible to increase rigidity in the four directions while keeping the friction coefficient low. The overall height is designed to be as low as possible. The LM block is made as thick as possible and is designed to be solidly fastened with six bolts (excluding types HRW12, 14LR, 17, and 21CR). Type HRW can be used with only one rail where space-saving is a necessity, moments act on the system, and high rigidity is required. A-296 A-IV Compact and high load-carrying capability Low noise Because a large number of balls is effective in carrying The turning corners of ball trains are provided with heavy loads, type HRW maintains excellent rigidity in synthetic-resin end plates, to ensure that the balls all directions. The great rail width allows all moments circulate smoothly. This results in low noise and stable involved to be properly borne by a single rail. linear motion. The rail cross section provides a large geometrical Type HRW27 has achieved 50 dB at a running speed of moment of inertia, ensuring high rigidity in the lateral 50 m/min. direction and thereby eliminating the need for a brace or similar reinforcement. Types and Features Type HRW-CA Miniature type HRW-LR Low-profile, wide, and radial-load-resistant. LM blocks are to be mounted using the tapped holes provided on their top surfaces. Low-profile, wide, four-way equal-load type. LM- block mounting holes are tapped, and the flange bottom surface is spot-faced. An LM block can therefore be mounted from either above or below. Type HRW-CR Low-profile, wide, four-way equal-load type. LM blocks are to be mounted using the tapped holes provided on their top surfaces. A-297 Load Rating and Permissible Moment in Various Directions Load rating Equivalent load The equivalent load for types HRW17 through 60 when loads are applied in all four directions to their LM blocks simultaneously can be obtained using the following equation: P = P (P )+P E R L T where P : equivalent load (N) E - In the radial direction - In the reverse-radial direction - In the lateral direction Fig. 2 P : radial load (N) R P : reverse-radial load (N) L Type HRW can bear loads applied in all four directions: P : lateral load (N) T radial, reverse-radial, and the two lateral directions. An equivalent load for types HRW 12, 14 when reverse- The basic load ratings of types HRW17 through 60 in radial and lateral loads are exerted on its LM block all four directions (radial, reverse-radial and the two simultaneously can be obtained using the following lateral directions) are equivalent to one another. The equation: values are given in the corresponding dimension tables. P = XP + YP E L T where The basic load ratings of types HRW12 and 14 are P : equivalent load (N) E those for the radial direction in the diagram. The - In the reverse-radial direction values are given in the corresponding dimension - In the lateral directions tables. Values for the reverse-radial and lateral P : reverse-radial load (N) L directions can be obtained from Table 1. P : lateral load (N) T X and Y : equivalent factor (see Table 2) Table 1 Type HRW12, 14 Basic Load Ratings in Various Directions Table 2 Type-HRW12, 14 Equivalent Factor Basic dynamic-load Basic static-load Direction rating rating P XY E Equivalent load in Radial direction C C O 1 2 the reverse-radial direction Reverse-radial Equivalent load in C = 0.78C COL = 0.71C direction L O 0.5 1 the lateral directions Lateral C = 0.48C COT = 0.35C T O directions A-298 A-IV In type HRW, a single LM block can bear moments in Permissible moment all directions. Table 3 gives the permissible moments in directions M , M , and M for a single LM block. A B C Table 1 Type HRW Static Permissible Moment Unit : kNm Model No. M M M A B c HRW 12 0.022 0.010 0.034 HRW 14 0.030 0.020 0.077 HRW 17 0.03 0.03 0.13 HRW 21 0.06 0.06 0.21 HRW 27 0.14 0.14 0.42 HRW 35 0.46 0.46 1.58 HRW 50 1.09 1.09 3.65 HRW 60 1.54 1.54 6.10 Fig. 3 Accuracy standards The accurancy of type HRW is divided into five grades, normal, high, precision, super-precision. Fig. 4 Normal grade LM-Rail length (mm) Fig. 5 Relationship Between LM-Rail Length and Running Parallelism A-299 Table 4 Type HRW Accuracy Standard Unit : mm Super- Ultra-precision Accuracy standard Normal High Precision Model precision No. Item No symbol H P SP UP _____ Tolerance for height M ±0.08 ±0.04 ±0.02 ±0.01 Tolerance for the height M _____ 0.015 0.007 0.005 0.003 difference among LM blocks Tolerance for rail-to-block _____ ±0.05 ±0.025 ±0.015 ±0.010 lateral distance W2 Tolerance for rail-to-block lateral HRW 12 _____ 0.02 0.01 0.007 0.005 distance W2 difference among LM blocks HRW 14 Running Parallelism of LM block C (as per Fig. 5) surface C with surface A Running parallelism of LM block D (as per Fig. 5) surface D with surface B 0 0 0 Tolerance for height M ±0.1 ±0.03 -0.03 -0.015 -0.008 Tolerance for the height M 0.02 0.01 0.006 0.004 0.003 difference among LM blocks Tolerance for rail-to-block 0 0 0 ±0.1 ±0.03 lateral distance W2 -0.03 -0.015 -0.008 Tolerance for rail-to-block lateral 0.02 0.01 0.006 0.004 0.003 distance W2 difference among LM blocks HRW 17 HRW 21 Running Parallelism of LM block C (as per Fig. 5) surface C with surface A Running parallelism of LM block D (as per Fig. 5) surface D with surface B 0 0 0 ±0.1 ±0.04 Tolerance for height M -0.04 -0.02 -0.01 Tolerance for the height M 0.02 0.015 0.007 0.005 0.003 difference among LM blocks Tolerance for rail-to-block 0 0 0 ±0.1 ±0.04 lateral distance W2 -0.04 -0.02 -0.01 Tolerance for rail-to-block lateral 0.03 0.015 0.007 0.005 0.003 distance W2 difference among LM blocks HRW 27 HRW 35 Running Parallelism of LM block C (as per Fig. 5) surface C with surface A Running parallelism of LM block D (as per Fig. 5) surface D with surface B 0 0 0 ±0.1 ±0.05 Tolerance for height M -0.05 -0.03 -0.02 Tolerance for the height M 0.03 0.015 0.007 0.005 0.003 difference among LM blocks Tolerance for rail-to-block 0 0 0 ±0.1 ±0.05 lateral distance W2 -0.05 -0.03 -0.02 Tolerance for rail-to-block lateral 0.03 0.02 0.01 0.007 0.005 distance W2 difference among LM blocks HRW 50 HRW 60 Running Parallelism of LM block C (as per Fig. 5) surface C with surface A Running parallelism of LM block D (as per Fig. 5) surface D with surface B A-300 A-IV Model-number coding HRW35 CA 2 UU C1 M + 1000L P M LM-rail material (stainless steel in this example) Accuracy grade LM-rail length (in mm) LM-block material (stainless steel in this example) Radial clearance Provision of end seals (end seal + side seal, this becomes “SS”) No. of LM blocks combined on a single axis Classification of the LM block Model No. Radial clearance Contamination Protection From our wide variety of products for type HRW, you Table 5 presents the radial clearances of types HRW. can select the best one for your situation. (For details on seals, see “Contamination Protection” for type HSR Table 5 Type-HRW Radial Clearances on page A-249.) Unit : µm Clearance Under a Medium Nomal light preload preload Seal resistance value symbol For the maximum value of seal resistance of Seals Model No. No symbol C1 C0 Type HRW...UU per LM block in which grease is ____ ± HRW 12 1.5 – 4 ~ – 1 applied, see Table 6. ____ ± HRW 14 2 – 5 ~ – 1 ____ HRW 17 – 3 ~ + 2 – 7 ~ – 3 Table 6 Type HRW Seal resistance ____ HRW 21 – 4 ~ + 2 – 8 ~ – 4 Unit: N ____ Model No. Resistance HRW 27 – 5 ~ + 2 – 11 ~ – 5 HRW 35 – 8 ~ + 4 – 18 ~ – 8 – 28 ~ – 18 HRW 12 0.2 HRW 50 – 10 ~ + 5 – 24 ~ – 10 – 38 ~ – 24 HRW 14 0.3 HRW 60 – 12 ~ + 5 – 27 ~ – 12 – 42 ~ – 27 HRW 17 2.9 HRW 21 4.9 HRW 27 4.9 9.8 HRW 35 HRW 50 14.7 HRW 60 19.6 A-301 Side seal for type HRW Scraper for type HRW Prevents contaminants from entering an LM block Removes spatters and similar large foreign matter from below End seal Scraper Side seal Fig. 6 Fig. 7 Not all LM Guide models accept all contamination-protection accessories. Please check Table 7. If your choice is applicable to your system, please note that in some models, attaching a contamination-protection accessory to an LM block changes the block’s overall length. To dimension L, add the increment given in the corresponding dimension table. Table 4 Type HRW: LM Block Overall Length with a Contamination- protection Accessory Attached Unit: mm No symbol UU SS DD ZZ KK Model. No. HRW12LRM Ο 36.1 Ο 37 Ο 37 × - × - × - HRW14LRM Ο 44.6 Ο 45.5 Ο 45.5 × - × - × - HRW17CA/CAM Ο 49.2 Ο 51 × - Δ 54 Δ 53.6 Δ 58.6 HRW17CR/CRM HRW21CA/CAM Ο 57.2 Ο 59 × - Δ 64.2 Δ 62.8 Δ 69 HRW21CR/CRM HRW27CA/CAM Ο 66.8 Ο 73 Ο 73 Ο 79 Ο 75.6 Ο 81.8 HRW27CR/CRM HRW35CA/CAM Ο 100.1 Ο 107.5 Ο 107.5 Ο 114.3 Ο 112.5 Ο 119.7 HRW35CR/CRM HRW50CA Ο 134.1 Ο 141.5 Ο 141.5 Ο 148.2 Ο 143.8 Ο 151 HRW50CR HRW60CA Ο 149.5 Ο 159 Ο 159 Ο 169.7 Ο 165.1 Ο 175.9 Note: Ο = Applicable × = Not applicable Δ = Applicable, but does not allow a side seal to be attached A-302 A-IV Dedicated Bellows JHRW for Type HRW Shown below are the dimensions of dedicated bellows JHRW for type HRW. When ordering the bellows, specify the relevant model number shown in the table below. Unit : mm A Boundary dimensions Applicable Model No. Lmax LM-Guide Mounting bolt WH H P b t b t ab model 1 1 1 2 2 ( ) S Lmin × × JHRW 17 68 22 23 15 43 3 18 6 *M3 0.5 6l 8 4 5 HRW 17 × × JHRW 21 75 25 26 17 48 3 22 7 M3 0.5 6l 8 3.5 6 HRW 21 33.5 × × JHRW 27 85 33.5 20 48 3 20 10 M3 0.5 6l 10 2.5 7 HRW 27 × × JHRW 35 120 35 35 20 75 3.5 40 13 M3 0.5 6l 6 - 7 HRW 35 42 × × JHRW 50 164 42 20 100 9 50 16 M4 0.7 8l - 1 7 HRW 50 × × JHRW 60 180 51 51 25 120 8 60 24 M5 0.8 10l - - 9 HRW 60 Note 1: Mounting bolts marked with a “**” for type JHRW17 should be used for LM rails only. Use tapping screws of designation 2.5x8 for LM blocks. Note 2: The expansion ratios in installation directions other than horizontal, e.g., vertical and wall-hung, differ from those specified in this table (guidelines: A – 1.5). When ordering bellows, please specify your installation direction. Note 3: If bellows are attached to both ends of an LM block, a grease nipple cannot be installed there. In such a case, contact us. Model-number coding Note: A bellows length can be calculated as shown below. JHRW21 - 60/360 S Lmin = S: stroke length in (mm) A 1 length when compressed Bellows dimensions ( ) length when expanded × Lmax= Lmin A A: expansion ratio Model No. (bellows for type HRW21 in this example) A-303 Stopper Precautions on Use In types HRW 12 and 14, removing the LM block from the rail causes the balls to fall off. To prevent this, the Mounting-Surface Height and Corner LM block is delivered with stoppers installed. If the Profile LM Guide is used without the stoppers, be careful not Normally, mounting surfaces for LM blocks and rails to allow the LM block to overrun. have lateral reference surfaces to aid in positioning rails and blocks with a high degree of accuracy. For the reference-surface shoulder height, see Table 8. Furthermore, provide enough space to the corner profile of a mounting surface so that the corner does not interfere with chamfers made on the LM blocks or rails, or provide the corner with a radius smaller than corner radius r specified in Table 8. Model No. A B C HRW 12 22 7 10.5 HRW 14 28.6 7.6 11.2 Fig. 8 Table 8 Mounting Surface Shoulder Height and Corner Radius Unit : mm LM rail LM block Corner shoulder shoulder Model No. radius r height max. height (max.) H H 2 E 1 HRW 12 0.5 1.5 4 2 HRW 14 0.5 1.5 5 2 HRW 17 0.4 2 4 2.5 HRW 21 0.4 2.5 5 3 HRW 27 0.4 2.5 5 3 HRW 35 0.8 3.5 5 4 HRW 50 0.8 3 6 3.4 HRW 60 1.0 5 8 6.5 A-304 A-IV LM-Rail Standard and Maximum Lengths Table 9 presents the standard and maximum lengths of G tends to reduce stability at the rail ends, which may LM rails for type HRW. If your maximum length is not degrade accuracy. within the range of this table, we offer special LM rails intended for connected use. For connected use, we offer LM rails that ensure the elimination of level differences at joints. Therefore, For dimension G when a special length is specified, we when placing an order, please specify the overall recommend those listed in Table 9. A large dimension length of the LM rails you require. Table 9 Type HRW LM rail Standard and Maximum Lengths Unit: mm Model No. HRW 12 HRW 14 HRW 17 HRW 21 HRW 27 HRW 35 HRW 50 HRW 60 70 70 110 130 160 280 280 570 110 110 190 230 280 440 440 885 150 150 310 380 340 760 760 1200 190 190 470 480 460 1000 1000 1620 LM-rail standard 230 230 550 580 640 1240 1240 2040 length 270 270 780 820 1560 1640 2460 310 310 2040 (L0) 390 390 470 470 550 670 Standard pitch F 40 40 40 50 60 80 80 105 G 15 15 15 15 20 20 20 22.5 1900 1900 3000 Max. length (1000) (1430) 3000 3000 3000 (800) (1000) (1200) Note 1: In special cases in which connected use is impossible but one of the maximum lengths specified here is required, contact us. Note 2: Numbers in parentheses indicate the maximum lengths of stainless steel types. A-305 HRW-CA Type HRW-CAM Type Standard type Stainless-steel type External LM block dimensions dimensions Model No. Height Width Length M W LB C S H h L TK N E 1 1 HRW 17 CA 17 60 51 53 26 M4 3.3 3.2 33.6 6 14.5 4 2 HRW 17 CAM HRW 21 CA 4.5 21 68 59 60 29 M5 4.4 3.7 40 8 18 12 HRW 21 CAM HRW 27 CA 27 80 73 70 40 M6 5.3 6 51.8 10 24 6 12 HRW 27 CAM HRW 35 CA 35 120 107.5 107 60 M8 6.8 8 77.6 14 31 8 12 HRW 35 CAM HRW 50 CA 50 162 141.5 144 80 M10 8.6 14. 18 14 16 103.5 46.6 HRW 60 CA 60 200 159 180 80 M12 10.5 15.5 117.5 25 53.5 15 16 Notes:  An “M” in a model number indicates that the corresponding LM blocks, rails, and balls are made of stainless steel and are therefore corrosion- and environment-resistant.  For permissible static moments M , M , and M , see page A-299. A B C A-306 A-IV pilot hole H (E) Unit : mm Basic load rating Mass LM-rail dimensions Grease Width nipple Height Pitch C C LM block LM rail 0 W 1 × × W W M Fd d h kN kN kg kg/m ±0.05 2 3 1 1 2 × × PB107 33 13.5 18 9 40 4.5 7.5 5.3 4.31 8.14 0.15 2.1 × × B-M6F 37 15.5 22 11 50 4.5 7.5 5.3 6.18 11.5 0.25 2.9 × × B-M6F 11.5 20.4 42 19 24 15 60 4.5 7.5 5.3 0.5 4.3 × × B-M6F 69 25.5 40 19 80 7 11 9 27.2 45.9 1.4 9.9 × × B-PT1/8 90 36 60 24 80 9 14 12 50.2 81.5 4.0 14.6 × × B-PT1/8 120 40 80 31 105 11 17.5 14 63.8 102 5.7 27.8  For standard LM-rail lengths, see page A-305.  For model-number coding, see page A-301. A-307 HRW-CR Type HRW-CRM Type Standard type HRW-LRMType Stainless-steel type External LM-block dimensions dimensions Model No. Height Width Length M W LB C S × l (l)L n TK N E 1 HRW 12 LRM × × 12 30 37 21 12 M3 0.5 3.5 (-) 4 27 4 10 2.8 - × × HRW 14 LRM 14 40 28 15 M3 0.5 4 (-) 4 32.9 5 12 3.3 - 45.5 HRW 17 CR × × 17 50 29 15 M4 0.7 5 (-) 4 33.6 6 14.5 4 2 51 HRW 17 CRM HRW 21 CR × × 21 54 59 31 19 M5 0.8 6 (-) 4 40 8 18 4.5 12 HRW 21 CRM HRW 27 CR × 27 62 73 46 32 M6 6 (6) 6 51.8 10 24 6 12 HRW 27 CRM HRW 35 CR × 35 100 76 50 M8 8 (8) 6 77.6 14 31 8 12 107.5 HRW 35 CRM × HRW 50 CR 50 130 141.5 100 65 M10 15 (15) 6 103.5 18 46.6 14 16 Notes:  An “M” in a model number indicates that the corresponding LM blocks, rails, and balls are made of stainless steel and are therefore corrosion- and environment-resistant.  For permissible static moments M , M , and M , see page A-299. A B C A-308 A-IV HRW12,14 (E) HRW17~50 Unit : mm LM rail dimensions Basic load rating Mass Grease Width nipple LM rail Height Pitch C C LM block 0 W 1 × × W W M Fd d h kN kN kg/m kg ±0.05 2 3 1 1 2 Oil hole Ø2.2 × × 18 - 6.5 40 4.5 8 4.5 3.29 7.16 6 0.045 0.79 drilled hole Oil hole Ø2.2 × × 24 8 - 7.2 40 4.5 7.5 5.3 5.38 11.4 0.080 1.20 drilled hole PB107 × × 33 8.5 18 9 40 4.5 7.5 5.3 4.31 8.14 0.12 2.1 × × B-M6F 37 8.5 22 11 50 4.5 7.5 5.3 6.18 11.5 2.9 0.19 × × B-M6F 42 24 15 60 4.5 7.5 5.3 11.5 20.4 10 0.37 4.3 × × B-M6F 69 15.5 40 19 80 7 11 9 27.2 45.9 1.2 9.9 × × B-PT1/8 90 20 60 24 80 9 14 12 50.2 81.5 3.2 14.6  For standard LM-rail lengths, see page A-305.  For model-number coding, see page A-301. A-309 A-310