LMF LMK LMH Linear Bearing LUU Series — Standard Flanged Extended Length Ball Bushing

LMF/LMK/LMH…LUU flanged recirculating linear ball bearing series — ISO Extended Flanged (JIS B 1192). 13 bore sizes. Dynamic load 323–7550 N. GCr15 HRC 58–64, dual lip seals, flanged housing mount.

MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.


Linear Bearings › Flanged Series › ISO Extended Flanged (JIS B 1192)

LMF LMK LMH Linear Bearing LUU Series — Standard Flanged Extended Length Ball Bushing

13 bore sizes • Dynamic load 323–7550 N • ISO Extended Flanged (JIS B 1192)

ISO Extended Flanged (JIS B 1192)
GCr15 HRC 58–64
Flanged Mount
Dual Lip Seal

🆕 Series Overview

The LMF/LMK/LMH...LUU series extends the standard flanged ball bushing with a longer body accommodating more simultaneous ball-to-shaft contacts, raising dynamic and static load ratings significantly. Flange dimensions — diameter, PCD, bolt-hole pattern, and thickness — are identical to the UU series, so housing tooling is shared across both body lengths.

The LUU extended body is preferred wherever the guidance system must resist moment loads, long stroke lengths, or cantilevered tooling plates. The additional body length improves stiffness against pitching and yawing moments without requiring a larger bore or a second bearing on a parallel shaft.

LMF/LMK/LMH...LUU flanged linear bearing product view

⚙ Key Design Features

📺

Flanged Axial Location

The precision-ground flange face registers directly against the housing shoulder, providing positive axial location without snap rings or adhesive retention.

●

GCr15 Chrome Steel

Through-hardened to HRC 58–64. Ball tracks ground to Ra 0.2 µm for full-film lubrication at the ball-race contact under rated load conditions.

📈

Dynamic Load 323–7550 N

Covering 13 bore sizes for applications from lightweight instrument stages to heavy industrial press guides.

🔒

NBR Dual Lip Seals

Retain factory-applied NLGI-2 grease while excluding dust and contamination. Rated −20°C to +80°C continuous service.

🛠

PA66-GF30 Retainer

Glass-filled nylon cage maintains precise ball spacing across the full 360° circuit, preventing ball-to-ball contact and associated noise.

✅

ISO/DIN Interchangeable

All dimensions conform to ISO Extended Flanged (JIS B 1192) standards for direct replacement compatibility with equivalent housings.

📋 Complete Specification Table

ⓘ Dynamic load rating C based on 50 km nominal life (L10). For 100 km design life, divide C by 1.26. Shaft h6/h7. Housing H7. All dimensions in mm, load ratings in N, weight in g.

LMF Model LMK Model LMH Model Bore dr OD D Length L H mm PCD mm Ball Cir. Dyn C (N) Sta Co (N) Wt (g)
LMF6LUU LMK6LUU LMH6LUU 6 12 35 22 20 4 323 529 31
LMF8LUU LMK8LUU LMH8LUU 8 15 45 28 24 4 431 784 51
LMF10LUU LMK10LUU LMH10LUU 10 19 55 32 29 4 588 1100 98
LMF12LUU LMK12LUU LMH12LUU 12 21 57 32 32 4 813 1570 110
LMF13LUU LMK13LUU LMH13LUU 13 23 61 33 33 4 813 1570 130
LMF16LUU LMK16LUU LMH16LUU 16 28 70 37 38 5 1230 2350 190
LMF20LUU LMK20LUU LMH20LUU 20 32 80 42 42 5 1400 2740 260
LMF25LUU LMK25LUU LMH25LUU 25 40 112 51 51 6 1560 3140 540
LMF30LUU LMK30LUU LMH30LUU 30 45 123 58 60 6 2490 5490 680
LMF35LUU LMK35LUU LMH35LUU 35 52 135 64 67 6 2650 6270 1020
LMF40LUU LMK40LUU — 40 60 151 75 75 6 3430 8040 1570
LMF50LUU LMK50LUU — 50 80 192 92 92 6 6080 15900 3600
LMF60LUU LMK60LUU — 60 90 209 106 106 6 7550 20000 4500
LMF/LMK/LMH...LUU dimensional specification drawing

🔭 Materials & Construction

Construction is identical to LMF/LMK/LMH...UU: GCr15 chrome steel (AISI 52100), HRC 58–64, ball tracks Ra 0.2 µm. Flange face runout 0.02 mm maintained regardless of body length. The larger internal volume holds a greater grease charge, marginally extending re-lubrication intervals.

The ball retainer is injection-moulded from glass-fibre-reinforced nylon (PA66-GF30), maintaining precise ball spacing around the full 360° circuit to prevent ball-to-ball contact noise at higher traverse speeds. Dual NBR lip seals on both end faces retain factory-applied NLGI-2 lithium-complex grease while excluding dust, swarf, and splash contamination. Operating temperature range is −20°C to +80°C with standard seals and grease.

🏭 Typical Applications

⚙

Laser Cutting & Engraving

Flanged ball bushings in CO₂ and fibre laser gantry systems resist the moment loads generated by the beam-delivery head offset, while the flange provides a clean mounting interface that simplifies replacement during scheduled maintenance.

📈

Food & Beverage Processing

Flanged bearings in filling-nozzle platforms and portioning conveyors allow rapid cartridge replacement during product changeovers; the flange retains the bearing against the housing face without tools, reducing changeover time.

LMF/LMK/LMH...LUU linear bearing in industrial application

🔧 Installation & Maintenance

🔎 Flange Face Seating

Ensure the housing counterbore depth matches the bearing flange thickness. An under-depth counterbore leaves the flange proud of the housing face, creating a gap at the bolt interface that allows the bearing to rock under load and introduces harmonic error motion.

🔧 Bolt Torque Sequence

Tighten flange mounting bolts in a cross pattern to 30–50% of final torque, then complete to specification. Sequential tightening distorts the flange and shifts the bore axis by up to 0.05 mm, degrading shaft alignment.

📈 Shaft Specification

Use a hardened shaft (HRC 60+) ground to h6 or h7 tolerance with surface roughness Ra 0.4 µm or better. An undersized or soft shaft accelerates ball-track wear and reduces rated service life significantly.

⚙ Lubrication

Apply NLGI-2 lithium-complex grease to the shaft before insertion. Re-lubricate every 500 km of travel or 6 months under normal duty. In washdown environments, shorten the re-lubrication interval and use a water-resistant grease formulation.

🔎 Selection Guide

Select LUU when the ISO 10285 life calculation using the UU dynamic load rating produces a service life below target, or when moment loads are identified. Verify that housing counterbore depth accommodates the longer LUU body before machining.

①

Confirm Bore & Standard

Match bore diameter to shaft. Confirm ISO Extended Flanged (JIS B 1192) housing dimensions — mixing ISO and DIN outer diameters requires housing re-machining.

②

Select Flange Style

Round flange for maximum moment resistance; diamond flange for compact bolt clearance; square flange for torsional resistance.

③

Calculate Load & Life

Compute radial load P. Target L10 = (C/P)³ × 50 km. If life is marginal, specify the LUU extended variant to raise C without changing bore.

④

Contact Us

MOQ 100 units per model. Contact our team with engineering drawings confirming shaft diameter, housing bore depth, bolt PCD, load case, and target life.

LMF/LMK/LMH...LUU linear bearing assembly and housing

❓ Frequently Asked Questions

▶ What does the LUU suffix indicate?

LUU denotes the extended-length body. The longer race accommodates more simultaneous ball contacts, raising both the dynamic load rating C and static rating Co compared with the standard-length UU equivalent of the same bore diameter and flange style.

▶ Are LMF...LUU and LMF...UU flanges the same size?

Yes. The flange diameter, PCD, bolt-hole pattern, and flange thickness are identical between the UU and LUU variants for the same bore size. Only the body length L and the resulting load ratings differ. This means the same housing tooling accepts both standard and extended versions.

▶ When should I specify LUU instead of UU?

Choose LUU when the application involves moment loads (carriage offset from bearing centreline), long unsupported stroke lengths, or when a single bearing must resist tilting forces without a second bearing on a parallel shaft. The extended body provides additional stiffness against all these load cases.

▶ Can two LUU bearings be used on a single shaft?

Yes — and this is the standard configuration for guided carriages. With two bearings separated by a span of 1.5–2× the carriage length, the system resists pitch, yaw, and roll moments. Ensure both housing bores are aligned within 0.02 mm per 100 mm to avoid preloading the ball tracks.

▶ How does the extended length affect lubrication intervals?

The larger internal volume of the LUU body holds more grease, extending the re-lubrication interval slightly compared with the UU variant under identical duty conditions. As a starting point, use the same 500 km or 6-month interval and adjust based on observed grease condition at the first inspection.

📞 Ready to Order?

MOQ is 100 units per model. Provide engineering drawings with shaft diameter, housing bore depth, flange PCD, load case, stroke, speed, and target life. All catalogue data is for reference only — verify critical dimensions against current revision drawings before committing to tooling.

LMF/LMK/LMH…LUU flanged recirculating linear ball bearing series — ISO Extended Flanged (JIS B 1192). 13 bore sizes. Dynamic load 323–7550 N. GCr15 HRC 58–64, dual lip seals, flanged housing mount.

MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.

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