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SDMF-UU/SDMK-UU Steel Cage Flange Linear Bearing

Home · Products · Linear Bearing · SDMF-UU/SDMK-UU Steel Cage Flange Linear Bearing
  • SDMF-UU/SDMK-UU Steel Cage Flange Linear Bearing
SDMF-UU/SDMK-UU Steel Cage Flange Linear Bearing

SDMF-UU/SDMK-UU Steel Cage Flange Linear Bearing

The SDMF/SDMK series are high-performance linear bearings that combine a steel cage, flange mounting, and standard/wide flange options. While providing excellent high-speed, temperature resistance, and long lifespan performance, the flange design enables extremely stable and convenient installation. It is an ideal choice for automation applications requiring medium to high speeds, heavy loads, or high installation rigidity.

Inquiry
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Technology

Core Sub-series Comparison and Selection Guide
The SDMF-UU/SDMK-UU steel cage flange linear bearings offer two different high-rigidity mounting solutions through variations in flange shape.

Product Features SDMF-UU (Steel Retaining Ring Flange Type) SDMK-UU (Steel Square/Rectangular Flange Type) Key Selection Criteria
Core Positioning The expert in secure mounting in confined spaces. The specialist for handling extremely high overturning and torsional loads. Choose the F-type for compact spaces where radial stability is required; choose the K-type for complex loads where torque resistance is the primary consideration.
Flange Design Circular flange. The flange diameter is typically slightly larger than the bearing outer diameter, with mounting holes evenly distributed around the circumference. Square or rectangular flanges. The flange area is significantly larger than the bearing outer diameter, with mounting holes provided at the four corners or at multiple positions. The flange shape determines the force distribution across the mounting surface and the torque resistance capacity.
Key Advantages 1. Secure and convenient installation: Easier to position and secure than standard sleeves.
2. Saves axial space: No additional bearing housing required.
3. The steel retainer provides high-speed and high-temperature resistance.		 1. Exceptional resistance to overturning moments: The wide flanges provide an extremely long lever arm, offering top-class resistance to overturning and torsional loads.
2. Exceptional mounting rigidity: Multi-point, wide-span fixation ensures virtually no deformation.
3. Steel shims ensure high-speed and high-temperature resistance.		 The F-type addresses the question of ‘how to secure it conveniently’, whilst the K-type addresses ‘how to secure it absolutely securely’.
Space Requirements Radial dimensions are slightly larger (due to the circular flange), but the structure is extremely compact and integrated, resulting in a small overall volume. Large radial dimensions (flange width) require a larger mounting surface, but the thickness (axial) may be reduced. The K-type requires a larger ‘footprint’, but provides ‘rock-solid’ stability.

Technical Focus
1. Core Advantages of Steel Retainers:
High-speed performance: Adaptable to higher linear speeds and accelerations.
Temperature resistance: Stable operation in higher ambient temperatures or in the presence of thermal radiation.
Long lifespan and high reliability: Metal cages resist wear and aging, and provide excellent grease retention.
2. Practical Significance of Flange Mounting:
Simplified design: Eliminates the tedious steps of designing, machining, and installing separate bearing housings.
Improved accuracy: The bearing's flange surface and axis perpendicularity are guaranteed at the factory, ensuring good alignment and no cumulative errors after installation.
Easy maintenance: Single component, simple disassembly and inspection.

Applications
SDMF-UU linear bearing (round flange): Suitable for high-speed automation scenarios with limited space, medium loads, and requiring reliable fixation, such as SMT equipment in the electronics industry and guiding systems for small high-speed stamping machines.
SDMK-UU linear bearing (square flange): Suitable for heavy-duty precision applications with heavy loads, long cantilevers, and where motion posture must be absolutely stable, such as the Z-axis spindle head of large coordinate measuring machines, the lifting mechanism of heavy-duty dispensing valves, and heavy modules in semiconductor equipment.

The SDMF/SDMK-UU series steel cage flange linear bearings perfectly combine core motion performance (steel cage) with the "art of installation."
Choosing the SDMF series means choosing an efficient, compact, and high-performance standardized mounting unit that makes integration elegant and simple.
Choosing the SDMK series means choosing the ultimate weapon to meet complex mechanical challenges; its wide flange itself is a promise—a promise of unwavering stability under extreme loads.

Parameters

NomInal shaft
diameter
(mm)		 Part No. Weight
(g)		 Major dimenslons and tolerance
Steel dr D Df L
SDF(K) mm Tolerance(μm) mm Tolerance(μm) mm mm Tolerance(μm)
6 SDMF 6-UU 24 6 0-9 12 0-13 28 19 ±300
SDMK 6-UU 18
8 SDMF 8S-UU 32 8 0-9 15 0-13 32 17 ±300
SDMK 8S-UU 24
8 SDMF 8-UU 37 8 0-9 15 0-13 32 24 ±300
SDMK 8-UU 29
10 SDMF 10-UU 72 10 0-9 19 0-16 40 29 ±300
SDMK 10-UU 52
12 SDMF 12-UU 76 12 0-9 21 0-16 42 30 ±300
SDMK 12-UU 57
13 SDMF 13-UU 88 13 0-9 23 0-16 43 32 ±300
SDMK 13-UU 72
16 SDMF 16-UU 120 16 0-9 28 0-16 48 37 ±300
SDMK 16-UU 104
20 SDMF 20-UU 180 20 0-10 32 0-19 54 42 ±300
SDMK 20-UU 145
25 SDMF 25-UU 340 25 0-10 40 0-19 62 59 ±300
SDMK 25-UU 300
30 SDMF 30-UU 470 30 0-10 45 0-19 74 64 ±300
SDMK 30-UU 375
35 SDMF 35-UU 650 35 0-12 52 0-22 82 70 ±300
SDMK 35-UU 560
40 SDMF 40-UU 1060 40 0-12 60 0-22 96 80 ±300
SDMK 40-UU 880
50 SDMF 50-UU 2200 50 0-12 80 0-22 116 100 ±300
SDMK 50-UU 2000
60 SDMF 60-UU 3000 60 0-15 90 0-25 134 110 ±300
SDMK 60-UU 2560
80 SDMF 80-UU 5800 80 0-15 120 0-25 164 140 ±300
SDMK 80-UU 5300
100 SDMF 100-UU 10600 100 0-20 150 0-29 200 175 ±300
SDMK 100-UU 9900

Part No. Major dimenslons and tolerance Eccentricity(μm) Squareness(μm) Basic load rating Nomlnal shaft
diameter
(mm)
Steel Flange dynamic
(C N)		 static
(Co N)
SDF(K) K
mm		 t
mm		 Dp
mm		 X
mm		 Y
mm		 Z
mm
SDMF 6-UU 22 5 20 3.5 6 3.1 12 12 206 265 6
SDMK 6-UU
SDMF 8S-UU 25 5 24 3.5 6 3.1 12 12 176 216 8
SDMK 8S-UU
SDMF 8-UU 25 5 24 3.5 6 3.1 12 12 274 392 8
SDMK 8-UU
SDMF 10-UU 30 6 29 4.5 7.5 4.1 12 12 372 549 10
SDMK 10-UU
SDMF 12-UU 32 6 32 4.5 7.5 4.1 12 12 510 784 12
SDMK 12-UU
SDMF 13-UU 34 6 33 4.5 7.5 4.1 12 12 510 784 13
SDMK 13-UU
SDMF 16-UU 37 6 38 4.5 7.5 4.1 12 12 774 1180 16
SDMK 16-UU
SDMF 20-UU 42 8 43 5.5 9 5.1 15 15 882 1370 20
SDMK 20-UU
SDMF 25-UU 50 8 51 5.5 9 5.1 15 15 980 1570 25
SDMK 25-UU
SDMF 30-UU 58 10 60 6.6 11 6.1 15 15 1570 2740 30
SDMK 30-UU
SDMF 35-UU 64 10 67 6.6 11 6.1 20 20 1670 3140 35
SDMK 35-UU
SDMF 40-UU 75 13 78 9 14 8.1 20 20 2160 4020 40
SDMK 40-UU
SDMF 50-UU 92 13 98 9 14 8.1 20 20 3820 7940 50
SDMK 50-UU
SDMF 60-UU 106 18 112 11 17 11.1 25 25 4700 10000 60
SDMK 60-UU
SDMF 80-UU 136 18 142 11 17 11.1 25 25 7350 16000 80
SDMK 80-UU
SDMF 100-UU 170 20 175 14 20 13.1 30 30 14100 34800 100
SDMK 100-UU

Drawings

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