Square Flange Linear Bearing LMKP20UU – 20mm Shaft Flange Linear Bearing
The LMKP20UU is a 20mm square linear bearing engineered for compact, high-rigidity linear motion mounting. As a double sided square ball bushing, it features a square flange machined on the bearing housing, allowing bolt-through mounting from either face - ideal for vertical, horizontal, or space-constrained installations where a standard cylindrical housing isn't practical.
Product Overview
The LMKP20UU square flange linear bearing pairs a precision ball bushing core with an integrated square mounting flange, combining the low-friction rolling motion of a standard linear bearing with the mounting stability of a flanged housing. The square flange design distributes clamping load evenly across four bolt points, giving this 20mm shaft flange linear bearing higher mounting rigidity than round-flange alternatives of the same bore size.
Manufactured by Zhejiang Siqiang Bearing Co., Ltd. (brand "SQ"), the LMKP20UU is part of the LMKP series of square flange linear bearings, produced on CNC turning and grinding lines with in-house ball assembly, sealing, and testing.
LMKP20UU Specifications (20mm Bore)
| Parameter | Specification |
|---|---|
| Model | LMKP20UU |
| Type | Square Flange Linear Bearing / Double Sided Square Ball Bushing |
| Bore Diameter (Dr) | 20 mm |
| Outer Diameter (D) | 32 mm |
| Overall Length (L) | 42 mm ±0.3 |
| Flange Width (K) | 42 mm |
| Flange Thickness (H) | 8 mm |
| Bolt Hole PCD | 43 mm |
| Mounting Hole (D1×d2×h) | 5.5 × 9 × 5.1 mm |
| Ball Circuits | 5 |
| Bore Tolerance | 0 / -10 μm |
| OD Tolerance | 0 / -19 μm |
| Eccentricity | 15 μm |
| Basic Dynamic Load Rating (Cn) | 882 N |
| Basic Static Load Rating (Co) | 1370 N |
| Weight | 180 g |
| Material | Bearing steel GCR15, precision-ground raceway |
| Sealing | Double-lip rubber seals (dust/debris protection) |
Other bore sizes in the same square flange series (LMKP6UU–LMKP60UU) available on request.
Key Features of the LMKP20UU Square Flange Linear Bearing
Square flange, double-sided mounting
bolt holes on all four corners allow this double sided square ball bushing to be mounted from either the front or rear face, giving installers flexibility without redesigning the mount.
01
20mm shaft compatibility
matched bore tolerance (0/-10 μm) for smooth, low-play travel on standard 20mm precision shafting.
02
High mounting rigidity from the square flange
spreads clamping force more evenly across four points than a round flange, reducing deflection under side-load conditions.
03
Sealed for contamination resistance
double-lip seals keep dust and debris out of the ball circuit, extending service life in workshop and factory environments.
04
Interchangeable dimensions
housing and bolt pattern follow common industry standards, so the LMKP20UU can drop into existing 20mm square flange linear bearing mounts.
05
Applications
Vertical-axis mounting
the square flange's four-point bolt pattern holds the 20mm shaft flange linear bearing rigidly in vertical orientations where a round flange would allow rotation under load.
Space-constrained automation axes
double-sided mounting on the square flange lets the LMKP20UU be installed from either side of a thin mounting plate, useful where access is limited to one face.
High-cycle linear slides
square flange bolt-through mounting resists the repeated side-loading seen in packaging and textile equipment better than press-fit or round-flange housings.
Why Source the LMKP20UU from SQ / Siqiang Bearing
Zhejiang Siqiang Bearing Manufacturing Co., Ltd. was established on June 19, 2007, in Lishui City, Zhejiang Province, and has been manufacturing linear bearings, linear guides, and related components for close to two decades under the "SQ" brand.
Every LMKP20UU is produced with documented process traceability and tested for load rating and eccentricity before shipment, backed by a 1-year warranty.
| Company Profile | Detail |
|---|---|
| Established | June 19, 2007 |
| Location | No. 97, Xianxia Road, Liandu District, Lishui, Zhejiang, China |
| Facility Area | 30+ mu (approx. 19,800 m²) |
| Employees | 141, incl. 16 technical staff |
| Quality Certification | ISO 9001 (certified 2020/9/18) |
| Environmental Compliance | ROHS (2021/6/16), REACH (2024/11/1) |
| Export Markets | Southeast Asia, Africa, Europe, South America |
| Product Range | Linear bearings, square/round flange linear bearings, linear guides, ball screws, rod ends, needle roller followers |
Frequently Asked Questions
Q: What does "square flange" mean on the LMKP20UU?
A: It refers to the four-corner square-shaped mounting flange machined onto the bearing housing, as opposed to a round flange - it gives four evenly spaced bolt points for a more rigid mount.
Q: Is the LMKP20UU a double sided square ball bushing?
A: Yes - the square flange allows the bearing to be bolted from either side of a mounting plate, making it a double-sided mounting design.
Q: What shaft size does the LMKP20UU fit?
A: It is designed for a 20mm precision shaft (h6 tolerance recommended for optimal fit).
Q: What's the difference between LMKP20UU and LMFP20UU?
A: Both are 20mm bore linear bearings from the same series, but LMKP20UU uses a square flange for four-point bolt mounting, while LMFP20UU uses a round flange - the square design offers greater resistance to rotation under side load.
Request a Quote for LMKP20UU Square Flange Linear Bearing
Get pricing, MOQ, and lead time for the 20mm square linear bearing LMKP20UU, or request a custom flange linear bearing quote for your project.
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