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SDMH-UU Steel Cage Double Cut Edge Linear Bearing

Home · Products · Linear Bearing · SDMH-UU Steel Cage Double Cut Edge Linear Bearing
  • SDMH-UU Steel Cage Double Cut Edge Linear Bearing
SDMH-UU Steel Cage Double Cut Edge Linear Bearing

SDMH-UU Steel Cage Double Cut Edge Linear Bearing

The SDMH-UU series is a high-performance linear bearing featuring a steel cage and a unique rectangular flange (double-cut edge) design. Its H-shaped flange is machined on both sides, creating a compact rectangular mounting surface. This design provides significantly greater resistance to overturning moments and superior mounting stability compared to round flanges (F-type), with almost no increase in overall mounting dimensions. It is an ideal choice for precision applications where space is limited and strict requirements are placed on load posture.

Inquiry
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Technology

The core value of the SDMH-UU steel cage double-cut edge linear bearing lies in achieving a golden balance between "moment resistance rigidity" and "space utilization."

Feature Dimensions SDMH-UU (Steel-reinforced rectangular flange / double-beveled type) SDMF-UU (Steel Round Flange Type) SDMK-UU (Steel Width-Retaining Flange Type) Core Value Proposition
Core Positioning High rigidity, high torque resistance, and the ultimate in compact design. A robust, economical and compact universal solution. The heavy-duty specialist offering ultimate rigidity and exceptional torque resistance. A perfect balance between the compactness of the F-type and the robustness of the K-type.
Flange Design Rectangular (double-beveled) flange. By removing the unnecessary sections of a circular flange, two parallel, wide mounting surfaces are created, with mounting holes positioned on both sides. Full-circle flange with evenly spaced mounting holes. Wide square or rectangular flanges, suitable for four-corner or multi-point mounting. The H-type design provides the maximum effective moment-resisting arm using the minimum amount of material.
Space Efficiency Extremely high. Whilst offering excellent torque resistance, its maximum profile dimensions (particularly in the diagonal direction) are significantly smaller than those of the K-type with equivalent load-bearing capacity, making it easier to integrate into compact structures. High. The circular profile may occupy unnecessary space in certain layouts. Low. Requires a large mounting surface to accommodate the wide flanges. The H-type is the high-rigidity flange solution offering the highest space utilisation.
Resistance to Overturning Moments Strong. The wide faces created by the double-beveled design provide a significantly greater moment-resisting lever arm than round flanges, particularly when resisting torques acting perpendicular to the axis of the wide faces. Medium. Extremely strong. Provides maximum torque resistance in all directions. It provides ample rigidity for most applications involving moderate eccentric moments, without wasting space.
Ease of Installation High. The two parallel mounting surfaces are easy to machine and align, and require less mounting plate material than the K-type. High. High, but requires a larger mounting area. The layout advantages of the H-type are particularly evident in narrow, elongated spaces or modular designs.
Advantages of Steel Construction Fully equipped. The steel retainer ensures high-speed, high-temperature and long-life operational performance. Fully equipped. Fully equipped. Shares the same top-tier core dynamic performance foundation.

Design Analysis: Why is the "double-cut edge" a clever design?
1. Mechanical Optimization: Overturning moments in many applications primarily come from one or two specific directions (such as the load overhang direction). The rectangular flange of the SDMH concentrates material in the direction most effective at resisting these critical moments, maximizing rigidity while minimizing weight.
2. Compatibility and Layout: Its rectangular shape facilitates side-by-side mounting or alignment on T-slots of profiles (such as aluminum profiles), and also allows for the arrangement of multiple bearings on narrow mounting plates, enabling high-density linear guidance designs.

Applications
The SDMH-UU series steel cage double-cut edge linear bearing is an ideal choice for the following precision applications requiring both high space efficiency and rigidity:
Precision Automation Modules: Slider mounting for linear motor modules and precision XY platforms, achieving high rigidity within a limited width.
Industrial Robots: Guidance for the end joints of lightweight six-axis robots, supporting grippers and loads in a compact space.
Semiconductor and Electronic Equipment: Lifting guidance for chip testing probe stations and high-precision dispensing valves, requiring high speed and stable posture.
Optical and Inspection Equipment: Mobile mounting bases for laser scanning heads and industrial cameras, requiring a compact and vibration-resistant fixing solution.

The SDMH-UU series steel cage double-cut edge linear bearing embodies the integration of Design for Manufacturing and Assembly (DFMA) principles and precise mechanical design. It doesn't pursue extreme parameters in every aspect, but instead cleverly "subtracts"—cutting away unnecessary parts and reinforcing key structures. This makes it a highly cost-effective, high-rigidity component: here, "cost-effectiveness" refers not only to price, but also to achieving improved rigidity that better meets practical needs with less space and weight.

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 SDMH 6-UU 21 6 0 -9 12 0 -13 28 19 ±300
8 SDMH 8-UU 33 8 0 -9 15 0 -13 32 24 ±300
10 SDMH 10-UU 64 10 0 -9 19 0 -16 40 29 ±300
12 SDMH 12-UU 68 12 0 -9 21 0 -16 42 30 ±300
13 SDMH 13-UU 81 13 0 -9 23 0 -16 43 32 ±300
16 SDMH 16-UU 112 16 0 -9 28 0 -16 48 37 ±300
20 SDMH 20-UU 167 20 0 -10 32 0 -19 54 42 ±300
25 SDMH 25-UU 325 25 0 -10 40 0 -19 62 59 ±300
30 SDMH 30-UU 388 30 0 -10 45 0 -19 74 64 ±300

Part No. Major dimenslons and tolerance Eccentricity(μm) Squareness(μm) Basic load rating NomInal shaft
diameter
(mm)
Steel Flange dynamic
(C N)		 static
(Co N)
SDMH.. W
mm		 t
mm		 A
mm		 F
mm		 X
mm		 Y
mm		 Z
mm
SDMH 6-UU 18 5 20 - 3.5 6 3.1 12 12 206 265 6
SDMH 8-UU 21 5 24 - 3.5 6 3.1 12 12 274 392 8
SDMH 10-UU 25 6 29 - 4.5 7.5 4.1 12 12 372 549 10
SDMH 12-UU 27 6 32 - 4.5 7.5 4.1 12 12 510 784 12
SDMH 13-UU 29 6 33 - 4.5 7.5 4.1 12 12 510 784 13
SDMH 16-UU 34 6 31 22 4.5 7.5 4.1 12 12 774 1180 16
SDMH 20-UU 38 8 36 24 5.5 9 5.1 15 15 882 1370 20
SDMH 25-UU 46 8 40 32 5.5 9 5.1 15 15 980 1570 25
SDMH 30-UU 51 10 49 35 6.6 11 6.1 15 15 1570 2740 30

Drawings

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