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)
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.

⚙ 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 |

🔭 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.

🔧 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.

❓ Frequently Asked Questions
📞 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.





