Description

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SCS-UU and SCS-LUU are closed linear bearing blocks that combine an LM linear ball bearing with a compact aluminum housing. The shaft passes completely through the enclosed bearing bore, creating a convenient mounting unit for moving plates, positioning fixtures and machine mechanisms.

SCS-UU uses a standard-length housing, while SCS-LUU provides a longer bearing unit for installations requiring a larger mounting footprint. The complete series covers shaft diameters from 6 to 60 mm, with corresponding dimensional, load-rating and bearing data provided below.

The block can be ordered separately or supplied with a matching round shaft. More shaft sizes and configurations are available in the DLY linear shaft range.

Closed Linear Bearing Block

The SCS housing surrounds the complete circumference of the linear bearing. This closed structure is intended for a round shaft that can pass through the entire block. It should not be installed on a continuously supported rail because the lower part of the housing does not have an opening to clear the rail support.

Integrated Housing

The LM linear bearing is installed inside a rectangular aluminum housing, eliminating the need to machine a separate bearing seat.

Top Mounting Holes

Four threaded holes on the upper surface allow a moving plate or machine component to be fixed directly to the block.

Replaceable Size Matching

Each SCS housing corresponds to an LM bearing with the same nominal shaft diameter, simplifying model identification.

UU and LUU

SCS…UU

Standard-length slide unit for compact mounting plates. Models are available for 6, 8, 10, 12, 13, 16, 20, 25, 30, 35, 40, 50 and 60 mm shafts.

SCS…LUU

Extended slide unit with a longer L dimension. Models are available for 8, 10, 12, 13, 16, 20, 25, 30, 35, 40, 50 and 60 mm shafts.

UU and LUU identify the block length, not the shaft diameter. For example, SCS20UU and SCS20LUU both fit a 20 mm shaft, but the LUU block is longer and uses a different longitudinal mounting-hole pitch.

Dimensions

The drawing identifies the housing dimensions, shaft centre position and mounting-hole arrangement. C and B have a tolerance of ±0.2 mm, while E and h have a tolerance of ±0.02 mm. The marks 4-S1 and 4-S2 indicate four mounting positions.

SCS UU and SCS LUU Parameters

SCS-UU Specifications

Dimensions are stated in millimetres. C is the basic dynamic load rating and C0 is the basic static load rating. Weight is the approximate weight of one complete slide unit.

Model	Shaft Ø	T	h	E	W	L	F	G	B	C	K	S1	S2	L1	Bearing	C (N)	C0 (N)
SCS6UU	6	6	9	15	30	25	18	15	20	15	5	M4	3.4	8	LM6UU	206	265
SCS8UU	8	6	11	17	34	30	22	18	24	18	5	M4	3.4	8	LM8UU	274	392
SCS10UU	10	8	13	20	40	35	26	21	28	21	6	M5	4.3	12	LM10UU	372	549
SCS12UU	12	8	15	21	42	36	28	24	30.5	26	5.75	M5	4.3	12	LM12UU	510	784
SCS13UU	13	8	15	22	44	39	30	24.5	33	26	5.5	M5	4.3	12	LM13UU	510	784
SCS16UU	16	9	19	25	50	44	38.5	32.5	36	34	7	M5	4.3	12	LM16UU	774	1180
SCS20UU	20	11	21	27	54	50	41	35	40	40	7	M6	5.2	12	LM20UU	882	1370
SCS25UU	25	12	26	38	76	67	51.5	42	54	50	11	M8	7	18	LM25UU	980	1570
SCS30UU	30	15	30	39	78	72	59.5	49	58	58	10	M8	7	18	LM30UU	1570	2740
SCS35UU	35	18	34	45	90	80	68	54	70	60	10	M8	7	18	LM35UU	1670	3140
SCS40UU	40	20	40	51	102	90	78	62	80	60	11	M10	8.7	25	LM40UU	2160	4020
SCS50UU	50	25	52	61	122	110	102	80	100	80	11	M10	8.7	25	LM50UU	3820	7940
SCS60UU	60	30	58	66	132	122	114	94	108	90	12	M12	10.7	25	LM60UU	4700	10000

SCS-LUU Specifications

Model	Shaft Ø	T	h	E	W	L	F	G	B	C	K	S1	S2	L1	Bearing	C (N)	C0 (N)
SCS8LUU	8	6	11	17	34	58	22	18	24	42	5	M4	3.4	8	LM8LUU	274	392
SCS10LUU	10	8	13	20	40	68	26	21	28	45	6	M5	4.3	12	LM10LUU	372	549
SCS12LUU	12	8	15	21	42	70	28	24	30.5	50	5.75	M5	4.3	12	LM12LUU	510	784
SCS13LUU	13	8	15	22	44	75	30	24.5	33	50	5.5	M5	4.3	12	LM13LUU	510	784
SCS16LUU	16	9	19	25	50	85	38.5	32.5	36	60	7	M5	4.3	12	LM16LUU	774	1180
SCS20LUU	20	11	21	27	54	96	41	35	40	70	7	M6	5.2	12	LM20LUU	882	1370
SCS25LUU	25	12	26	38	76	130	51.5	42	54	100	11	M8	7	18	LM25LUU	980	1570
SCS30LUU	30	15	30	39	78	140	59.5	49	58	110	10	M8	7	18	LM30LUU	1570	2740
SCS35LUU	35	18	34	45	90	155	68	54	70	120	10	M8	7	18	LM35LUU	1670	3140
SCS40LUU	40	20	40	51	102	175	78	62	80	140	11	M10	8.7	25	LM40LUU	2160	4020
SCS50LUU	50	25	52	61	122	215	102	80	100	160	11	M10	8.7	25	LM50LUU	3820	7940
SCS60LUU	60	30	58	66	132	240	114	94	108	180	12	M12	10.7	25	LM60LUU	4700	10000

Selecting the Correct Block

Begin with the nominal shaft diameter, then check the available mounting envelope and load conditions. Selecting only by the bore diameter can result in incorrect mounting-hole positions or insufficient support for an offset load.

Shaft diameter: the number in the SCS model must match the nominal shaft diameter.
Mounting length: check L and C before changing between UU and LUU.
Installation height: confirm h, F and the moving-plate position within the machine assembly.
Applied moment: consider the distance between the load centre and the shaft, not only the vertical force.
Block spacing: greater spacing between two blocks generally improves moment resistance but increases the required platform length.

Shaft and Installation Requirements

The shaft should be straight, clean and compatible with a recirculating linear ball bearing. Shaft deflection must be considered when the shaft is supported only at its ends, especially when the travel span or applied load increases.

Remove burrs from the shaft end and use a suitable chamfer to prevent damage to the bearing seals and ball retainer.
Insert the shaft in line with the bearing bore. Do not force the block onto a misaligned shaft.
Install the shaft supports without twisting the shaft or creating parallelism error between two shafts.
Attach the moving plate using the specified S1 mounting thread and tighten the screws evenly.
Move the assembly through its complete stroke and check for local resistance before operating under power.

Lubrication and Maintenance

A suitable lubricant should be applied to the internal ball circuit before operation and replenished according to travel distance, speed and environmental conditions. The shaft surface should remain free from chips, abrasive dust and dried contamination.

If movement becomes uneven, inspect shaft alignment, lubrication condition, surface damage and contamination before replacing the bearing. Increasing screw torque will not correct a misaligned two-shaft assembly.

Applications

Small positioning tables

Packaging machine adjustments

Inspection fixtures

Printing and labeling equipment

Laboratory motion mechanisms

General automation assemblies

FAQ

Q: Can an SCS block run on a supported round rail?

A: A standard SCS block has a closed housing and cannot pass over a continuous rail support. It is normally used with a round shaft whose support structure remains outside the block travel path.

Q: Can SCS20UU be replaced with SCS20LUU?

A: Both models fit a 20 mm shaft, but the L dimension changes from 50 to 96 mm and the C mounting-hole pitch changes from 40 to 70 mm. The moving plate must therefore have sufficient space and the correct hole layout.

Q: Does the SCS model include the internal LM bearing?

A: The listed SCS slide unit is configured with the corresponding LM linear bearing shown in the specification table. Confirm whether a complete assembled unit or housing-only supply is required when ordering.

Q: What do S1 and S2 represent?

A: S1 identifies the four threaded mounting holes on the top of the block. S2 identifies the four lower mounting-hole positions shown in the dimensional drawing.

Q: What information is needed for model confirmation?

A: Provide the shaft diameter, required UU or LUU version, block quantity, shaft length, support spacing, moving load and available mounting dimensions. A drawing is recommended for two-shaft or multiple-block assemblies.