Linear Guides for Heavy Load - Dust Resistant - With Double Seals / Metal Scrapers, Normal Clearance
Caution
- If you wish to use the "Parallel Use of 2 Rails" alteration, please order in even numbers (2, 4, etc.).
Product Description
Dust Resistant Heavy Load Linear Guides usable in areas with noticeable dust and machining chips. Manufactured by SURUGA Production Platform, Co., Ltd. SURUGA Production Platform has developed its business based around accurate processing technology capable of micron level accuracy.
SURUGA's accurate mechanical parts are also used in fields employing cutting edge technologies such as the aerospace and automobile industries.
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 | SXRD | SXRK | Blank: None -MX: Provided | 24 28 33 | Blank: Standard G: Grease G L: Grease L Y: Grease Y H: Grease H |
| 2 | SX2RD | SX2RK | ||||||
| 1 mm increments (Dimension Configurable) | 1 | SXRDL | SXRKL | |||||
| 2 | SX2RDL | SX2RKL | ||||||
| Wide Block Through Hole | Standard length (Selectable) | 1 | SXWD | SXWK | ||||
| 2 | SX2WD | SX2WK | ||||||
| 1 mm increments (Dimension Configurable) | 1 | SXWDL | SXWKL | |||||
| 2 | SX2WDL | SX2WKL | ||||||
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 | |||||||
SXRD | 24 | ー | 640 | （SXRD24-640） | |||||
SX2RDL-MX | 24 | ー | 661 | ー | TMS | （SX2RDL-MX24-661-TMS） | |||
SXWDL | 24 | G | ー | 700 | ー | B4 | （SXWDL24G-701-B4） |
Drawing
| Type | Standard Accuracy | Assembly Height (H) | Accuracy (µm) | |
|---|---|---|---|---|
| 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 | ||
| 33 | 30 | |||
| Dimension Range | Tolerance (mm) | |
|---|---|---|
| Over | or Less | |
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 |
[ NG ]Blocks and rails cannot be purchased separately.
Specification Table
| Block Type | H | L 4 | Block Dimensions | Rail Dimensions | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| W | L15 | B | C | S × ℓ | L2 | K | T | Cb | Grease Fitting | H1 | W1 | W2 | Ca | Counterbored Hole | F | G 6 | |||||||
| Standard | MX | Tapped Hole | Through Hole | Mounting Hole | E | T1 | d1 × d2 × h | ||||||||||||||||
| Standard Block | 24 | 160 to 1480 (220) | 34 | 62 (62.2) | 71.6 (71.8) | 26 | 26 | M4 × 7 | — | 41 | 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 | 73.4 (72.6) | 83 (82.2) | 32 | 32 | M5 × 8 | — | 47.6 | 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 (280) | 48 | 90 (89.4) | 99.6 (99) | 35 | 35 | M6 × 9 | — | 61 | 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 (220) | 52 | 62 (62.2) | 71.6 (71.8) | 41 | 26 | — | 4.5 (Through) | 41 | 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 | 73.4 (72.6) | 83 (82.2) | 49 | 32 | — | 5.5 (Through) | 47.6 | 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 (280) | 73 | 90 (89.4) | 99.6 (99) | 60 | 35 | — | 7 (Through) | 61 | 26.5 | 10 | 1.0 | M6 × P0.75 | 13 | 6.8 | 18 | 23 | 25 | 0.8 | 7 × 11 × 9 | 60 | 20 | |
4For L, dimensions in ( ) are the minimum lengths for 2 Block Type.
5L1 Dimension: Dimensions in ( ) are for Metal Scraper Type.
6For 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 |
! The dimensions in ( ) are not available for the standard 2-block type.
Basic Load Rating, Allowable Static Moment, Mass, Friction Resistance (Required Thrust), Sliding Resistance (Seal Resistance)
kgf = N × 0.101972
| Height (H) | Basic Load Rating 7 | Allowable Static Moment | Mass | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C (Dynamic) kN | Co (Static) kN | Block 1 pc. | Block 2 pcs. in close contact 8 | Block kg | Guide Rail kg/m | ||||||||
| MA N⋅m | MB N⋅m | MC N⋅m | MA N⋅m | MB N⋅m | MC N⋅m | Double-Sealed | With Metal Scrapers | ||||||
| Standard | Wide | Standard | Wide | ||||||||||
| 24 | 8.6 | 14.2 | 69.0 | 69.0 | 98.0 | 184.5 | 184.5 | 196.0 | 0.21 | 0.26 | 0.21 | 0.26 | 1.5 |
| 28 | 12.5 | 21.3 | 155.0 | 155.0 | 232.0 | 390.2 | 390.2 | 464.0 | 0.32 | 0.37 | 0.32 | 0.37 | 2.4 |
| 33 | 20.2 | 34.5 | 275.0 | 275.0 | 393.0 | 873.5 | 873.5 | 786.0 | 0.48 | 0.63 | 0.49 | 0.64 | 3.4 |
7The 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.
8The 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) ≤ (MA, MB, MC)/fs
fs: Static Safety Factor Co: Basic Static Load Rating
MA, MB, MC: Allowable Static Moment (N⋅m)
![[Figure]Allowable Static Moment](http://content.misumi-ec.com/image/upload/t_msmwm_wyg/v1/p/jp/product/wysiwyg/wysiwygcommon/pic_glossary_10.png)
・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
μ: Dynamic Friction Coefficient
w: Load (N)
f: Sliding Resistance (Seal Resistance)
| Type | Dynamic Friction Coefficient (μ) |
| Miniature Linear Guide | 0.004 to 0.006 |
| Linear Guides for Medium Load | 0.002 to 0.003 |
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)
■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.
● Advantages of Lubrication Unit MX: Provides long term maintenance-free operation. Reduces maintenance cost. Most suitable where the design does not allow lubrication. |
● 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. |
● 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.
| !The overall length will be shortened by the amount of cutting. Example: The L dimension of SXRD24-880-LLC is 870 mm. !Applicable only to Selectable Type (standard rail length). | ||||||||
| WC | 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. (× SX2RD24-880-B4) |
| H | B3 (3-block) | B4 (4 blocks) |
| 24 | 340 | 400 |
| 28 | 400 | 460 |
| 33 | 400 | 520 |
More Information
[ ! ]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.