Name: China LMFC20LUU Manufacturers Suppliers Factory - Customized LMFC20LUU - SIQIANG Bearing
Brand: SIQIANG
SKU: 306921225

Middle Flange Linear Bearing – LMFC/LMKC Series

Metric Flanged Linear Motion Bearing for Precision Linear Motion Systems

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.

Overview

The LMFC/LMKC series is a metric flanged linear motion bearing engineered for stable, low-friction linear travel along a round shaft. As a middle flange linear bearing, the mounting flange is centered along the bearing body rather than at either end, allowing installation from either side of a mounting plate - a design advantage that simplifies integration into automated equipment, CNC machinery, 3D printers, packaging lines, and robotic actuators.

Available as a long round middle flanged bushing in circuit configurations from 4 to 6 rows of steel balls, the series covers bore diameters from 6 mm to 60 mm, giving engineers a wide selection of load capacities within a single, standardized product family. For applications needing extra shaft-engagement length and reduced angular play, the extended round flange linear bearing variants (LMFC13, LMFC16 and larger) provide a longer body length while keeping the same flange-mount interface as the standard series.

Key Technical Features

Ball circuit design

4, 5, or 6 recirculating ball circuits depending on bore size, for consistent load distribution and smooth linear travel

Shaft bore range

Dr 6 mm – 60 mm, covering light-duty positioning stages through heavy industrial linear axes

Middle flange mounting (D1 x D2 x H)

centered flange geometry allows flexible orientation and easier alignment during assembly

Tolerance control

Dr and outer diameter (D) tolerances held to tight micron-level bands (0/-10 μm to 0/-25 μm depending on size) for repeatable fit in precision motion systems

Basic load ratings

dynamic (C) and static (Co) load ratings published for every bore size, from 323 N / 529 N at the smallest bore up to 7550 N / 20000 N at the 60 mm bore, supporting straightforward bearing selection for a given load case

Eccentricity control

held within 15–30 μm across the range, important where shaft-to-flange concentricity affects positioning accuracy

PCD (pitch circle diameter) and bolt-hole pattern:

standardized D1xD2xH hole dimensions per size, for direct interchange with common metric flanged linear bearing housings already in use on existing equipment

Full Dimension & Load Rating Table

Seal Type	Ball Circuit	Dr (mm)	D (mm)	L (mm)	I (mm)	D1 (mm)	K (mm)	H (mm)	PCD (mm)	C (N)	Co (N)
LMFC6LUU / LMKC6LUU	4	6	12	35	15	28	22	5	20	323	529
LMFC8LUU / LMKC8LUU	4	8	15	45	20	32	25	5	24	431	784
LMFC10LUU / LMKC10LUU	4	10	19	55	24.5	40	30	6	29	588	1100
LMFC12LUU / LMKC12LUU	4	12	21	57	25.5	42	32	6	32	813	1570
LMFC13LUU / LMKC13LUU	4	13	23	61	27.5	43	34	6	33	813	1570
LMFC16LUU / LMKC16LUU	5	16	28	70	32	48	37	6	38	1230	2350
LMFC20LUU / LMKC20LUU	5	20	32	80	36	54	42	8	43	1400	2740
LMFC25LUU / LMKC25LUU	6	25	40	112	52	62	50	8	51	1560	3140
LMFC30LUU / LMKC30LUU	6	30	45	123	56.5	74	58	10	60	2490	5490
LMFC35LUU / LMKC35LUU	6	35	52	135	62.5	82	64	10	67	2650	6270
LMFC40LUU / LMKC40LUU	6	40	60	151	69	96	75	13	78	3430	8040
LMFC50LUU / LMKC50LUU	6	50	80	192	89.5	116	92	13	98	6080	15900
LMFC60LUU / LMKC60LUU	6	60	90	209	95.5	134	106	18	112	7550	20000

Full spec sheet with tolerance data and D1xD2xH bolt patterns available on request - our engineering team can also confirm interchangeability with your current housing dimensions.

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Applications

This middle flange linear bearing series is widely applied in:

CNC routers, engraving machines and machining centers

Automated packaging and labeling equipment

3D printers and additive manufacturing gantries

Textile and printing machinery

Semiconductor handling and inspection equipment

Robotics and pick-and-place linear axes

Medical device positioning stages

Whether the requirement is a compact long round middle flanged bushing for a light-load XY stage or a heavier-duty extended round flange linear bearing for an industrial gantry axis, the LMFC/LMKC family is sized to match load, speed, and mounting-envelope requirements without custom tooling.

Why Source This Metric Flanged Linear Motion Bearing From Us

20Years of experience

ZHEJIANG SIQIANG BEARING MANUFACTURE CO., LTD ("SQ" Brand) has manufactured linear bearings, linear guides and blocks, ball screws, joint bearings, and cam followers since our founding on June 19, 2007, at our own-property facility in Lishui City, Zhejiang Province, China - a private enterprise serving as vice-chairman unit of the Lishui Rolling Functional Components Association.

Real Manufacturing Scale, Not A Trading Company

In-House Quality Testing

Certified Quality Systems

Consistent, Growing Export Business

Trusted by recognized industrial buyers

Customization support

Installation support

After-sales assurance

Frequently Asked Questions

Q: What is the difference between a middle flange linear bearing and an end-flange (open) linear bearing?

A: A middle flange linear bearing has its mounting flange centered along the length of the bearing body, rather than at one end. This lets the unit be bolted from either side of a mounting plate and is preferred in equipment where flange access or orientation needs to stay flexible during assembly or maintenance.

Q: Are LMFC and LMKC interchangeable with other brands' metric flanged linear motion bearings?

A: Yes. The LMFC/LMKC series follows standard metric D1xD2xH flange and PCD bolt patterns used across the industry, so in most cases it can directly replace an existing flanged linear bearing without modifying the housing, provided the bore diameter (Dr) and outer diameter (D) match.

Q: What load rating should I choose for my application?

A: Select a bore size where the static load rating (Co) comfortably exceeds your maximum static load, and the dynamic load rating (C) supports your expected travel life at operating speed. Send us your shaft diameter, expected load, and travel cycle, and our engineers can confirm the correct part number.

Q: Can you supply a long round middle flanged bushing in non-standard lengths?

A: Yes. Beyond the standard L dimensions listed in our table, we can produce extended-length middle flange bearings and extended round flange linear bearing variants to drawing for applications needing additional shaft engagement or reduced angular play.

Q: Do you provide samples before a bulk order?

A: Yes. We offer sample inspection service so you can verify tolerance, load rating, and finish quality before committing to a production order.

Q: What is the minimum order quantity (MOQ) and lead time?

A: MOQ and lead time depend on bore size and whether the flange/length is standard or custom. Standard sizes (6–60 mm) are typically available for faster turnaround; contact our sales team with your required quantity for a firm quote.

Q: Do you offer OEM/private-label packaging?

A: Yes. We can produce custom seals, poly bags, boxes, and cartons, including your company logo and branded packaging design, at no design cost to you.

Q: What warranty and after-sales support is included?

A: All LMFC/LMKC bearings carry a 1-year warranty. If a component is damaged under normal use within the warranty period, we provide a free replacement. We also supply installation videos and assembly guidance to support your maintenance team.

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