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3 in stock
LM Guide carriage block for 23 mm wide size-25 rail, 36 mm assembly height, 70 mm block width, four rows of balls at 45° contact angle. Dynamic load 27.6 kN, static 36.4 kN. Block only — no rail supplied.
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| MFR / Brand | THK |
|---|---|
| MPN | HSR25CA1SS |
| Model | HSR25CA1SS (GK) |
| Condition | New |
|---|---|
| Type | Linear Bearing |
| Relubrication | Grease nipple B-M6F fitted |
| Preload | HSR25 is offered in Normal, C1 (light preload) and C0 (medium preload). Grade of this specific item not marked in the source data. |
| Base Number | HSR25CA |
| Industry Terms | LM guide block, linear carriage, linear bearing block, linear guide runner block, LM block, profile rail carriage, HSR block |
| Application Types | Machine tool axes, CNC routers and mills, gantry and pick-and-place automation, semiconductor and electronics assembly, packaging machinery, measuring and inspection stages |
| Total Width | 83.1 mm (block length L with SS or UU seals) |
| Overall Width | 70 mm (block width W) |
| Bolt Center To Center Length | Block mounting hole pattern B x C = 57 x 45 mm, 6 x M8 taps |
| Housing Style | CA block type - flanged with tapped mounting holes, mountable from the top or the bottom |
| Mpn Variants | HSR25CA1SS, HSR25CA1SS(GK), HSR25CA1SSGK, HSR-25-CA1-SS, HSR 25 CA1 SS, HSR25CA1UU, HSR25CA, HSR-25 CA, HSR25-CA1-SS-GK |
| Manufacturer Status | THK active catalogue series; GK interchangeable line current |
| Compatible With Replaces | Runs on THK HSR25 LM rail, 23 mm wide, 60 mm hole pitch. As a GK-series block it may be freely combined with any HSR25 GK rail of the same accuracy and preload grade. |
| Arrangement Configuration | Block only. No LM rail supplied. The GK designation means this block is interchangeable with any HSR25 GK rail of matching accuracy and preload grade. |
| Precision Class | HSR25 is offered in Normal, H, P, SP and UP accuracy grades. Grade of this specific item not marked in the source data. |
| Additional Attributes | Block body length L1 59.5 mm. Mating rail: width W1 23 mm (+/-0.05), height M1 22 mm, mounting hole pitch F 60 mm, hole d1 x d2 x h 7 x 11 x 9 mm, maximum rail length 3000 mm. Static permissible moments: MA 0.324 kN-m one block / 1.8 kN-m two blocks; MB 0.324 kN-m one block / 1.8 kN-m two blocks; MC 0.366 kN-m one block. The two-block moment figure is about five times the one-block figure, not double, because two blocks react a moment as a couple across their spacing. Source: THK published LM Guide catalogue tables A1-200/201 and A1-182. |
| Dynamic Load Rating | 27.6 kN (basic dynamic load rating C) |
| Static Load Rating | 36.4 kN (basic static load rating C0) |
| Bearing Type | Linear motion guide carriage block, four-way equal load, full-complement ball |
| Item Weight | Block 0.59 kg. Mating rail 3.3 kg/m. |
| Number Of Rows | 4 rows of balls |
| Contact Angle | 45° |
| Design Units | Metric |
| Part Number | HSR25CA1SS(GK) |
| Cross Reference 1 | HSR25A |
|---|---|
| Cross Reference 2 | HSR25B |
| Cross Reference 3 | HSR25C |
| Cross Reference 4 | HSR25R (narrow block type) |
| Cross Reference 6 | HSR30CA (larger size) |
This is a THK LM Guide carriage block, model HSR25CA — a four-way equal-load linear bearing block running on a 23 mm wide HSR size-25 LM rail. HSR is THK’s flagship full-ball linear guide series: four rows of balls at a 45° contact angle, giving equal load capacity downward, upward and to both sides.
This is the block on its own, with no LM rail. THK marks standard LM Guide blocks and rails with matching serial numbers and states that “an LM rail and LM blocks used in combination must have the same serial number,” because preload and running parallelism are set as a pair.
This part carries the (GK) designation. THK’s GK series exists specifically so blocks and rails can be bought separately — in THK’s words, the GK series “features a lineup of interchangeable LM blocks and LM rails that can be combined freely as long as they have the same model number.” Any HSR25 GK rail of matching accuracy and preload grade makes a correct assembly.
HSR: four-way equal-load full-ball LM Guide series.
25: size, corresponding to a 23 mm wide rail.
CA: block type, flanged, tapped mounting holes, mountable from top or bottom.
1: THK’s coding field for the number of LM blocks used on the same rail, not a pack quantity.
SS: end seal plus side seal. DD is double seal, UU is end seals only.
GK: the interchangeable block-only / rail-only series.
Assembly height M: 36 mm.
Block width W: 70 mm.
Block length L, with UU or SS seals: 83.1 mm. Block body L1: 59.5 mm.
Block mounting hole pattern B x C: 57 x 45 mm; taps 6 x M8.
Mating rail width W1: 23 mm (±0.05). Rail height M1: 22 mm.
Rail hole pitch F: 60 mm; hole d1 x d2 x h: 7 x 11 x 9 mm.
Basic dynamic load rating C: 27.6 kN.
Basic static load rating C0: 36.4 kN.
Static permissible moment MA: 0.324 kN·m (one block) / 1.8 kN·m (two blocks).
Static permissible moment MB: 0.324 kN·m (one block) / 1.8 kN·m (two blocks).
Static permissible moment MC: 0.366 kN·m (one block).
Rolling elements: four rows of balls, 45° contact angle, full complement with retainer plates.
Block mass: 0.59 kg. Rail mass: 3.3 kg/m.
Grease nipple: B-M6F. Maximum rail length: 3000 mm.
Accuracy grades available: Normal, H, P, SP, UP. Preload grades: Normal, C1, C0.
The four-row 45° geometry is the reason to choose HSR over a two-row guide. With the contact lines at 45°, capacity is identical in all four radial directions and moment stiffness is symmetrical, so wall, inverted and vertical rail mounting carry no derating, and a single block resists roll, pitch and yaw.
The trade is friction and speed. A full-complement ball guide has balls contacting each other in the circulation path, which runs warmer and noisier at high speed than a caged-ball design. Caged-ball series are smoother for fast light duty; HSR is the family for heavy, shock-loaded, orientation-agnostic duty.
MA and MB are quoted for one block and for two blocks on the same rail, and the two-block value is roughly five times the single-block value rather than double. Two blocks spaced along a rail react a moment as a couple between them, so capacity scales with their spacing. A single-block axis is sized on the one-block column.
Cross-references: HSR25CA1SS, HSR25CA1SS(GK), HSR-25-CA1-SS, HSR25CA1UU, HSR25CA, HSR 25 CA, HSR25-CA1-SS-GK. Related block types in the same size: HSR25A, HSR25B, HSR25C, HSR25R. Adjacent sizes: HSR20CA, HSR30CA.
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