Product overview
The LMH20UU is a single oval flange ball bushing (H-type) designed for 20 mm shafts, offering a compact bolt-mount oval flange that simplifies housing integration and reduces assembly time compared to standard cylindrical bearings. The hardened GCr15 bearing steel body (HRC 58–62) combined with a resin cage and dual rubber seals delivers smooth, low-friction linear motion under continuous industrial cycles.
With a dynamic load rating of 860 N and a static rating of 1,370 N, the LMH20UU makes it a reliable CNC automation linear guide bearing for mid-range automation, packaging machinery, medical devices, textile equipment, and CNC axis systems where mounting rigidity and positional accuracy matter. Operating temperature range is −15 °C to +80 °C. For corrosive or washdown environments, the nickel-plated and stainless steel variants are available.
Full dimensional specification
★What is an Oval Flange Ball Bushing?
The LMH20UU belongs to the single oval flange ball bushing family (H-type flange), distinguished from round/square flange types by its compact oval mounting profile - ideal where housing space is limited but bolt-mount rigidity is still required, such as in CNC automation linear guide bearing applications.
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| MATERIAL:SS304 |
| type | Major dimensions and tolerance | Eccentricity |
Squareness |
Radial (max) μm |
load rating |
||||||||||||||||
| flange type :H type Weight | dr | D | L | D1 | H | PCD | K | W | A | F | d1×d2×h | ||||||||||
| Oval | Weight (g) |
No.of ball rows |
mm | tolearnace (μm) | mm | tolearnace (μm) | mm | tolearnace (μm) | mm | CN |
CON |
||||||||||
| μm | μm | ||||||||||||||||||||
| LMH6UU-SS | 18 | 4 | 6 | 0 -9 |
12 | 0 -11 |
19 | ±0.3 | 28 | 5 | 20 | 22 | 18 | 20 | 3.5×6×3.1 | 200 | 260 | ||||
| LMH8UU-SS | 29 | 4 | 8 | 0 -9 |
15 | 0 -11 |
24 | ±0.3 | 32 | 5 | 24 | 25 | 21 | 24 | 3.5×6×3.1 | 12 |
12 |
-5 | 260 | 400 | |
| LMH10UU-SS | 51 | 4 | 10 | 0 -9 |
19 | 0 -13 |
29 | ±0.3 | 40 | 6 | 29 | 30 | 25 | 29 | 4.5×7.5×4.1 | 370 | 540 | ||||
| LMH12UU-SS | 56 | 4 | 12 | 0 -10 |
21 | 0 -13 |
30 | ±0.3 | 42 | 6 | 32 | 32 | 27 | 32 | 4.5×7.5×4.1 | 410 | 590 | ||||
| LMH13UU-SS | 78 | 4 | 13 | 0 -10 |
23 | 0 -13 |
32 | ±0.3 | 43 | 6 | 33 | 34 | 29 | 33 | 4.5×7.5×4.1 | 500 | 770 | ||||
| LMH16UU-SS | 107 | 5 | 16 | 0 -10 |
28 | 0 -16 |
37 | ±0.3 | 48 | 6 | 38 | 37 | 34 | 31 | 22 | 4.5×7.5×4.1 | -7 | 770 | 1170 | ||
| LMH20UU-SS | 139 | 5 | 20 | 0 -10 |
32 | 0 -16 |
42 | ±0.3 | 54 | 8 | 43 | 42 | 38 | 36 | 24 | 5.5×9×5.1 | 15 | 15 | 860 | 1370 | |
| LMH25UU-SS | 279 | 6 | 25 | 0 -10 |
40 | 0 -16 |
59 | ±0.3 | 62 | 8 | 51 | 50 | 46 | 40 | 32 | 5.5×9×5.1 | -9 | 980 | 1560 | ||
| LMH30UU-SS | 353 | 6 | 30 | 0 -10 |
45 | 0 -19 |
64 | ±0.3 | 74 | 10 | 60 | 58 | 51 | 49 | 35 | 6.6×11×6.1 | 1560 | 2740 | |||
| 1N=0.102kgf |
Typical applications
Industrial automation
Pick-and-place axes, actuator guide rails, gantry systems requiring repeatable linear positioning.
Packaging machinery
High-cycle filling, sealing, and conveying mechanisms where low friction and long service life reduce downtime.
Medical equipment
Diagnostic and imaging device carriages requiring smooth, quiet motion with consistent positional accuracy.
CNC & Machine Tools (CNC Automation Linear Guide Bearing Use Cases
Auxiliary axes, tool-changer slides, and sub-spindle guides needing rigid flange-mount retention.
Textile & printing
Warp-beam carriages, printing-head guides, and tensioning systems with continuous bidirectional cycles.
Electronics assembly
SMT placement heads, test-probe stages, and wafer-handling units where micro-level precision is critical.
Products Description
Surface treatment
Standard GCr15, nickel plating (corrosion-resistant), or full stainless steel for food, medical, or washdown environments.
Packaging & branding
Neutral poly bag, custom printed carton, or OEM-branded box with your logo - all customizable per order.
Label & marking
SQ or SIQIANG branding standard; white-label or custom laser marking available for distributor/OEM customers.
Compliance documents
RoHS & REACH certificates, material reports, and product datasheets provided with every order on request.
Recommended reading
1.Installation Methods and Precautions for Linear Bearing
Covers workspace preparation, anti-rust oil removal, component inspection, alignment sequence, torque guidance, and post-installation testing - everything needed to get a linear bearing like the LMH20UU running correctly from day one. Read the full guide →
2.Round vs. Square vs. Oval Flange Linear Bearings: How to Choose the Right One
Explains when oval flange geometry outperforms round or square flanges on mounting height, moment load capacity, and field serviceability - useful context before specifying the LMH20UU for space-constrained or overhung-load applications. Read the full guide →
Why source from SQ
SQ is a Vice President unit of the Lishui Rolling Functional Components Association, a recognized Lishui Trustworthy Enterprise, and holds independent export authority. Supply partners include MISUMI, YHB, and Aiant. Compliance certificates (RoHS, REACH) are downloadable from our compliance page.
17+
Years manufacturing
120+
CNC & grinding machines
4+
Export continents
ISO 9001
Quality system certified
12 months
Product warranty
≤ 12 h
Inquiry response time
FAQ
Q: What shaft diameter does the LMH20UU fit?
A: The LMH20UU is designed for a 20 mm precision shaft (inner diameter tolerance 0/−0.010 mm). It pairs with SQ linear shafts or equivalent h6/g6 tolerance ground steel shafts. Refer to our shaft-fit guide for housing bore tolerance recommendations.
Q: Is a stainless steel or nickel-plated version available?
A: Yes. The LMH20UU Nickel Plating variant offers improved corrosion resistance for moderately humid or lightly corrosive environments. For full stainless-steel construction, please contact us - suitable for food-grade, medical, or washdown applications.
Q: What is the minimum order quantity and lead time?
A: Standard-stock LMH20UU is available for orders of various quantities - contact us with your target volume for a specific quote. Sample orders are accepted and prototyping support is available before committing to bulk. Lead times vary by order size; please inquire directly for confirmed delivery windows.
Q: Do you provide installation support?
A: Yes. We provide assembly instructional videos, written installation guides, and technical drawings with every order. For first-time buyers, our team can advise on housing bore fit, preload adjustment, and lubrication. See also our installation guide article below.
Q: What lubrication is recommended?
A: Apply a light coat of anti-rust / machine oil before installation and periodically during use. This extends service life and prevents surface corrosion on the shaft. For sealed units (UU suffix), the dual rubber seals retain initial grease but periodic re-lubrication of the shaft is still recommended in high-cycle applications.
Q: What type of bearing is the LMH20UU - round flange or oval flange?
A: The LMH20UU is a single oval flange ball bushing (H-type), featuring a compact oval-shaped bolt-mount flange rather than a round or square flange. This design is common in CNC automation linear guide bearing setups where mounting footprint needs to be minimized without sacrificing rigidity.
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