Linear Guides for Medium Load - Dust Resistant - With Double Seals / Metal Scrapers, Normal Clearance

Brand :

MISUMI

Caution

Delivery times for some of our products may be delayed as national government authorities have imposed limit of capacity at our production sites.

Product Description

Linear Guides for Medium Load - Dust Resistant - With Double Seals / Metal Scrapers, Normal Clearance
These linear guides or linear slides are factory automation components. They offer a wide variety of sizes to choose from.
[Feature]
● Rail Length Minimum/Maximum (mm.): 160 and 1960
● Assembly Height (mm.): 24, 28, and 33
● Block Type : Standard and Wide Block
● Material: Carbon Steel 58HRC
[Application]
It is used in a variety of machines such as CNC machines, 3D printers, measuring instruments, and so on.

Type (Part Number)

Dimensional Drawing

Specification / Dimensions Table

Basic Load Rating, etc.

Alterations (Optional)

Type (Part Number)

Material (Hardness)	Block Type	Rail Length Type 1	Number of Blocks 2	Preload/Accuracy A		Lubrication Unit (MX) Equipped / Not EquippedB	Height (H) C	Grease D 3
				Normal Clearance
				Standard Grade
				Double-Sealed	With Metal Scrapers
Carbon Steel [Alloy Steel including SCM] (58HRC or more)	Standard Block	Standard length (Selectable)	1	SVRD	SVRK	Blank: None -MX: Provided	24 28 33	Blank: Standard G: Grease G L: Grease L Y: Grease Y H: Grease H
		Standard length (Selectable)	2	SV2RD	SV2RK
		1 mm increments (Dimension Configurable)	1	SVRDL	SVRKL
		1 mm increments (Dimension Configurable)	2	SV2RDL	SV2RKL
	Wide Block Through Hole	Standard length (Selectable)	1	SVWD	SVWK
		Standard length (Selectable)	2	SV2WD	SV2WK
		1 mm increments (Dimension Configurable)	1	SVWDL	SVWKL
		1 mm increments (Dimension Configurable)	2	SV2WDL	SV2WKL

1If the desired rail length is not available in the standard length (selectable), please specify the length in 1 mm increments (dimension configurable).

2If a 3- to 4-block product is desired, please select a part number for a 1-block product and specify "B3 (3 blocks)" or "B4 (4 blocks)" for alterations.

3*Only standard grease is available for the MX (with lubrication unit) type.

!Heat resistance temperature is -20 to 80°C.

[ NG ]Blocks and rails cannot be purchased separately.

Part Number Configuration

Example: [Rail Length Type] 1 mm increments, [Number of Blocks] 2, [Type] Standard Block, Double-Sealed, [MX] Provided, [Height] 24, [Grease] Standard Grease

Type	Height H	Grease	ー	Rail Length L	ー	Alterations
A B	C	D
SVRD	24		ー	640			（SVRD24-640）
SV2RDL-MX	24		ー	661	ー	TMS	（SV2RDL-MX24-661-TMS）
SVWDL	24	G	ー	700	ー	B4	（SVWDL24G-701-B4）

Drawing

Linear Guide for Medium Load - Dust Resistant, With Double Seals / Metal Scrapers, Normal Clearance: Related Image

■Dimension Diagram of Blocks with MX (Lubrication Units) Standard Block Wide Block

[ ! ]For L Dimension Configurable Type, G dimensions differ from those shown in the table below.

■H・W₂ Dimensional Accuracy

Type		Standard Accuracy	Assembly Height (H)	Accuracy (µm)
Type		Standard Accuracy	Assembly Height (H)	Standard Grade
Linear Guides for Medium Load/ Heavy Load	Normal Clearance	Height H Dimension Tolerance	24 to 33	±100
		Pair Variation of Height H		20
		Width W₂ Dimension Tolerance		±100
		Pair Variation of Width W₂	24・28	20
		Pair Variation of Width W₂	33	30

■Dimension Tolerances of Other Symbols

Dimension Range		Tolerance (mm)
Over	or Less	Tolerance (mm)
0.5	3	±0.1
3	6	±0.1
6	30	±0.2
30	120	±0.3
120	400	±0.5
400	1000	±0.8
1000	2000	±1.2

Compliant with JIS B 0405-1991 Class m (Medium Class)

[ NG ]Blocks and rails cannot be purchased separately.

Specification Table

Block Type	H	L	Block Dimensions													Rail Dimensions
			W	L₁4		B	S × ℓ	L₂	K	T	Cb	Grease Fitting			H₁	W₁	W₂	Ca	Counterbored Hole	F	G 5
			W	Standard	MX	B	S × ℓ	L₂	K	T	Cb	Mounting Hole	E	T₁	H₁	W₁	W₂	Ca	d₁ × d₂ × h	F	G 5
Standard Block	24	160 to 1480	34	46 (46.2)	55.6 (55.8)	26	M4 × 7	25	20	7	0.85	M5 × P0.8	6	5	12.5	15	9.5	0.5	3.5 × 6 × 4.5	60	20
	28	220 to 1960	42	53.4 (52.6)	63 (62.2)	32	M5 × 8	27.6	22.5	7.5	1.0	M6 × P0.75	13	6	15.5	20	11	0.6	6 × 9.5 × 8.5	60	20
	33	220 to 1960	48	66 (65.4)	75.6 (75)	35	M6 × 9	37	26.5	8	1.0	M6 × P0.75	13	6.8	18	23	12.5	0.8	7 × 11 × 9	60	20
Wide Block	24	160 to 1480	52	46 (46.2)	55.6 (55.8)	41	4.5	25	20	7	0.5	M5 × P0.8	6	5	12.5	15	18.5	0.5	3.5 × 6 × 4.5	60	20
	28	220 to 1960	59	53.4 (52.6)	63 (62.2)	49	5.5	27.6	22.5	9	1.0	M6 × P0.75	13	6	15.5	20	19.5	0.6	6 × 9.5 × 8.5	60	20
	33	220 to 1960	73	66 (65.4)	75.6 (75)	60	7	37	26.5	10	1.0	M6 × P0.75	13	6.8	18	23	25	0.8	7 × 11 × 9	60	20

4Dimensions in ( ) are for Metal Scraper Type.

5For L Dimension Configurable Types, both ends of the rail are evenly cut. G dim. resulting from this cutting process will differ from those indicated on the above table.

!Grease Fitting: Straight type for H24 and Angled Type for H28 and above.

!Grease fittings are screw-in types, and thus, can be repositioned.

!Correctly match the datum planes (the side with the straight grooves) of both the rail and block. For details, see "Mounting and Handling" below.

Standard Rail Length (Selectable) List

The table below lists the standard rail lengths for each size. Please select the rail length from here.
Lengths not listed in the table below can be custom specified in 1 mm increments.

Height (H)	Rail Length (L)
24	160	220	280	340	400	460	520	580	640	700	760	820	880	940	1000	1120	1240	1360	1480
28	220	280	340	400	460	520	580	640	700	760	820	880	940	1000	1120	1240	1360	1480	1600	1720	1840	1960
33	220	280	340	400	460	520	580	640	700	760	820	880	940	1000	1120	1240	1360	1480	1600	1720	1840	1960

Basic Load Rating, Allowable Static Moment, Mass, Friction Resistance (Required Thrust), Sliding Resistance (Seal Resistance)

kgf = N × 0.101972

Height (H)	Basic Load Rating 6		Allowable Static Moment						Mass
	C (Dynamic) kN	Co (Static) kN	Block 1 pc.			Block 2 pcs. in close contact 7			Block kg				Guide Rail kg/m
			M_A N⋅m	M_B N⋅m	M_C N⋅m	M_A N⋅m	M_B N⋅m	M_C N⋅m	Double-Sealed		With Metal Scrapers
			M_A N⋅m	M_B N⋅m	M_C N⋅m	M_A N⋅m	M_B N⋅m	M_C N⋅m	Standard	Wide	Standard	Wide
24	5.0	8.23	33.0	33.0	57.0	124.3	124.3	114.0	0.16	0.21	0.16	0.21	1.5
28	7.2	12.1	58.0	58.0	135.0	254.0	254.0	270.0	0.22	0.27	0.22	0.27	2.4
33	11.7	19.6	109.0	109.0	225.0	582.3	582.3	450.0	0.33	0.43	0.34	0.44	3.4

6The basic load rating is the same for all four directions (radial, reverse-radial, and lateral directions) relating to blocks. Can be used in any orientation.

7The allowable static moment when two blocks are in close contact is not a guaranteed value but a reference value.

The guideline for the allowable load and allowable moment of the linear guide is the value obtained by dividing each value (above table) by the static safety factor fs (below table).
Example: Allowable load (kN) for H24 under normal driving conditions: 8.23/2 = 4.12 (Approx. 420 kg)
The frictional resistance (required thrust) when actually using a linear guide varies depending on factors such as the applied load.

Static Safety Factor (Lower Limits of fs)

Condition of Use	Lower Limits of fs
For normal operating condition	1 to 2
When smooth running performance is required	2 to 4
When there is vibration or impact	3 to 5

Allowable Load (N) ≤ Co/fs
Allowable Moment (N⋅m) ≤ (M_A, M_B, M_C)/fs

fs: Static Safety Factor Co: Basic Static Load Rating
M_A, M_B, M_C: Allowable Static Moment (N⋅m)

Friction Resistance (Required Thrust Force)

・In linear guides, the rolling elements perform rolling motion, resulting in lower frictional resistance compared to sliding guides.
However, this can vary depending on the applied load, speed, and the characteristics of the lubricant.
Especially when a moment load is applied or preload is applied, friction resistance increases. Although seal resistance varies depending on the seal lip press-fit allowance
and the condition of the lubricant, it is not proportional to load and always shows a constant value.

F＝μ・w＋f

F: Friction Resistance (N)
μ: Dynamic Friction Coefficient
w: Load (N)
f: Sliding Resistance (Seal Resistance)

Dynamic Friction Coefficient

Type	Dynamic Friction Coefficient (μ)
Miniature Linear Guide	0.004 to 0.006
Linear Guides for Medium Load	0.002 to 0.003

Calculation Example

Condition: Miniature linear guide (standard rail) assembly height (H): 10: Sliding resistance (seal resistance): 0.5 (N)
Dynamic Friction Coefficient (μ): 0.005
Load: 150 (N)

F (Friction Resistance)＝0.005×150+0.5＝1.25(N)

Mounting and Handling

■Datum Plane and Mounting Direction

Datum plane has the Datum Plane Mark (groove) on the block and rail (Fig. A). Be sure to match the datum planes for use.
The mounting direction shown in Fig. B is acceptable. All the basic load ratings are same.

Fig. A

Fig. B

■ Precautions for Use

Although the retainer (wire) prevents the balls from derailing, care must be taken when attaching and removing the block.
Radial clearances and accuracies are not guaranteed if the blocks and rails are interchanged from the original set combinations.
Rails cannot be connected end to end.
The accuracy of Linear Guides is guaranteed after mounting the rail (after fastening screws on the rail and pushing it onto the datum plane).
Minor bending of the rail will be adjusted by being secured and will not affect the performance.

■About Grease

Filled with a standard grease: lithium soap based grease (Alvania Grease S2 by Showa Shell Sekiyu K.K) before shipment.
The standard grease when selecting the lubrication unit MX is (ENEOS Corporation Tufflix MP2).
Greasing with a different brand of grease is not recommended. Please use the same brand of grease.
Grease Fitting: Straight Type for H24 and Angled Type for H28 and H33.
Grease fittings are screw-in types, and thus, can be repositioned.

■Standard Grease Fitting Position

When the datum plane is in front, the grease fitting is attached in the direction shown in the diagram below.

■Lubrication Unit

● Advantages of Lubrication Unit MX:
　Provides long term maintenance-free operation.
　Reduces maintenance cost.
　Most suitable where the design does not allow
　lubrication.

■Double-Sealed

● The double-seal scheme with two layers of side
　seals enhances the sealing effect and prevents
　intrusion of foreign substances into the block.
● Can be used where dust and machining chips exist.

[ ! ] Sliding resistance of Double-Sealed Type is higher than that of Standard Type.

■With Metal Scrapers

● Larger foreign substances adhered to the rail can
　be removed by attaching metal scrapers on the
　external side of the side seals.
● Can be used in areas with high temperature dusts
　such as weld spatter.

Alterations

Code

Alterations

Specifications

Notes

TMS
TMC

TMS: Tapped Hole Machining + Stopper Plate
TMC: Tapped Hole Machining Only

·Adds tapped holes on both rail ends to prevent blocks from falling off.

·M3 × P0.5 Depth 5 Tapped Holes
·2 block stopper plates are included.

LLC
RLC

LLC: Left End Cut
RLC: Right End Cut

·Cuts rail ends.
·Rails are cut with the engraved side as front (datum plane as back).
(as shown in the image on the left)
·Please refer to the table below for the length of the rail to be cut.

Dimension H	L Cut	N
24	10	10
28
33

!The overall length will be shortened by the amount of cutting.
Example: The L dimension of SVRD24-880-LLC is 870 mm.
!Applicable only to Selectable Type (standard rail length).

Parallel Use of 2 Rails

·Please specify in parallel use of 2 rails.
·Pair variation of Height H between 2 rails is set within 20 µm.
·Rails are shipped in pairs.

!Please order in even numbers. (Number of pairs cannot be specified)
!Not applicable to High Grade Type.

B3
B4

B3: Additional Block (Total 3 pcs.)
B4: Additional Block (Total 4 pcs.)

3-Block Specifications

4-Block Specifications

·It will be shipped with 3 (4) blocks installed.
·There is a minimum length limit for the L dimension (rail length).
Please refer to the table below "Shortest Selectable Rail Lengths for B3/B4."

!Not applicable to High Grade Type.
!Please specify the part number for one block.
(× SV2RD24-880-B4)

■Shortest Selectable Rail Lengths for B3/B4

H	B3 (3-block)	B4 (4 blocks)
24	280	340
28	340	400
33	340	400

More Information

Standard Block

Wide Block

■Precautions for Use
[ ! ]Blocks are equipped with retainers to prevent balls from derailing. Refer to >>P.501
[ ! ]Radial clearances and accuracies are not guaranteed if the blocks and rails are interchanged from the original set combinations.
[ ! ]Straight grooves are provided on datum planes. Be sure to match the datum lines when using.
[ ! ]Rails cannot be connected to be extended.
[ ! ]Running parallelism is the value measured after the rail is mounted.
■Others
- For G dimensions of L Dimension Configurable Type, refer to >>P.507
- Filled with Lithium soap based grease (Alvania Grease S2 by Showa Shell Sekiyu K.K).
Grease Fittings: Straight type for H24 and angled type for H28 and H33.