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Radial-biased LM Guide carriage block for 34 mm wide size-35 rail, 48 mm assembly height, 70 mm block width. Dynamic load 60.4 kN, static 81.8 kN. Block only — no rail supplied.
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| MFR / Brand | THK |
|---|---|
| MPN | SR35W1SS |
| Model | SR 35 W1 SS GK / SR-35V/W |
| Condition | New |
|---|---|
| Type | Linear Bearing |
| Preload | SR35 is offered in Normal, C1 (light preload) and C0 (medium preload). Grade of this specific item not marked in the source data. |
| Base Number | SR35W |
| Industry Terms | LM guide block, linear carriage, linear bearing block, linear guide runner block, LM block, profile rail carriage, SR block, radial linear guide |
| Application Types | Heavy vertically-loaded axes - machining centre saddles and tables, press slides, heavy transfer tables, large gantry beams, and any position where load is predominantly downward |
| Total Width | 111 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 = 50 x 50 mm, 4 x M8 taps 12 mm deep |
| Housing Style | W block type - bolts mounted from above. THK does not designate SR-W as a 'wide type'; the companion type is SR35V. |
| Mpn Variants | SR35W1SS, SR35W1SS(GK), SR35W1SSGK, SR-35W1-SS, SR 35 W1 SS, SR35W1UU, SR35W, SR-35W, SR-35V/W |
| Manufacturer Status | THK active catalogue series; GK interchangeable line current |
| Compatible With Replaces | Runs on THK SR35 LM rail, 34 mm wide, 80 mm hole pitch. As a GK-series block it may be freely combined with any SR35W 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 SR35W GK rail of matching accuracy and preload grade. |
| Precision Class | SR35 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 79 mm. Mating rail: width W1 34 mm (0/-0.05), height M1 27.5 mm, mounting hole pitch F 80 mm, hole d1 x d2 x h 9 x 14 x 12 mm, maximum rail length 3000 mm. Static permissible moments: MA 0.785 kN-m one block / 4.27 kN-m two blocks; MB 0.482 kN-m one block / 2.65 kN-m two blocks; MC 1.08 kN-m one block. Note MA does not equal MB - the 90 deg contact angle makes this block asymmetric, unlike the 45 deg HSR series. IMPORTANT: 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. DO NOT CROSS-READ THE SR35V: it shares the catalogue table line but has C 40.9 kN, C0 46.7 kN, L 77.6 mm, mass 0.8 kg - a different block. Source: THK published LM Guide catalogue table A1-216/217. |
| Dynamic Load Rating | 60.4 kN (basic dynamic load rating C, radial) |
| Static Load Rating | 81.8 kN (basic static load rating C0) |
| Bearing Type | Linear motion guide carriage block, radial-biased, full-complement ball |
| Item Weight | Block 1.2 kg. Mating rail 6.4 kg/m. |
| Number Of Rows | 4 rows of raceways |
| Contact Angle | 90° |
| Design Units | Metric |
| Part Number | SR35W1SS(GK) |
| Cross Reference 1 | SR35V (companion block type, same size - LOWER ratings, not equivalent) |
|---|---|
| Cross Reference 2 | SR30W (smaller size) |
| Cross Reference 3 | SR35TB |
This is a THK LM Guide carriage block, model SR35W — a four-row linear bearing block running on a 34 mm wide SR size-35 LM rail. The SR series differs from THK’s HSR series in one respect: the raceway geometry is arranged for a 90° contact angle rather than 45°.
In the SR series the ball contact lines are set at 90°, which biases the block’s capacity strongly toward radial load — downward load, in a normal horizontal installation.
The published moment figures for this block are MA 0.785 kN·m and MB 0.482 kN·m. In the HSR series those two are equal, because 45° geometry is symmetrical. The SR series is built for applications where the load is predominantly downward and radial capacity per millimetre of block height is the priority. At 60.4 kN dynamic from a 48 mm tall block, the SR35W is considerably stronger radially than an HSR of comparable height.
Suited loads are mostly vertical and downward: a heavy table, a vertical machining centre saddle, a press slide. Wall-mounted, inverted or multi-direction loading is served by the HSR series, whose upward and lateral capacity is higher.
This is the block alone, with no LM rail. THK serial-number-matches standard blocks to their rails 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 precisely so blocks and rails can be bought separately — the GK line “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 SR35W GK rail of matching accuracy and preload grade makes a correct assembly.
SR: THK’s radial-biased LM Guide series, 90° contact angle.
35: size, corresponding to a 34 mm wide rail.
W: block type, bolts mounted from above. THK does not describe SR-W as a “wide type” despite the letter; the companion type is SR35V.
1: THK’s coding field for the number of 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: 48 mm.
Block width W: 70 mm.
Block length L, with UU or SS seals: 111 mm. Block body L1: 79 mm.
Block mounting hole pattern B x C: 50 x 50 mm; taps 4 x M8 x 12 mm deep.
Mating rail width W1: 34 mm (0 / −0.05). Rail height M1: 27.5 mm.
Rail hole pitch F: 80 mm; hole d1 x d2 x h: 9 x 14 x 12 mm.
Basic dynamic load rating C: 60.4 kN (radial).
Basic static load rating C0: 81.8 kN.
Static permissible moment MA: 0.785 kN·m (one block) / 4.27 kN·m (two blocks).
Static permissible moment MB: 0.482 kN·m (one block) / 2.65 kN·m (two blocks).
Static permissible moment MC: 1.08 kN·m (one block).
Rolling elements: four rows of raceways, 90° contact angle, full complement with retainer plates.
Block mass: 1.2 kg. Rail mass: 6.4 kg/m. Maximum rail length: 3000 mm.
Accuracy grades: Normal, H, P, SP, UP. Preload grades: Normal, C1, C0.
The SR35V shares a table line with the SR35W in THK’s catalogue and its figures are C 40.9 kN, C0 46.7 kN, block length 77.6 mm, mass 0.8 kg. Every figure published above is the W-type column.
Cross-references: SR35W1SS, SR35W1SS(GK), SR-35W1-SS, SR-35V/W, SR35W, SR 35 W, SR35W1UU, SR35W1SSGK. Companion block type in the same size: SR35V. Adjacent sizes: SR30W, SR35TB. The moment values are quoted for one block and two blocks, and the two-block figure is roughly five times the one-block figure rather than double, because two blocks react a moment as a couple across their spacing.
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