LMF LMK LMH Linear Bearing UU Series — Standard Flanged Sealed Ball Bushing

LMF/LMK/LMH…UU flanged recirculating linear ball bearing series — ISO Standard Flanged (JIS B 1192). 13 bore sizes. Dynamic load 206–4700 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 Standard Flanged (JIS B 1192)

LMF LMK LMH Linear Bearing UU Series — Standard Flanged Sealed Ball Bushing

13 bore sizes • Dynamic load 206–4700 N • ISO Standard Flanged (JIS B 1192)

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

🆕 Series Overview

The LMF/LMK/LMH...UU series comprises three flange configurations — round (LMF), diamond (LMK), and square (LMH) — each sharing identical bore, outer diameter, and body length with the standard LM...UU cylindrical bearing. The flanged design adds a precision-ground face that registers directly against the housing shoulder, providing positive axial location without snap rings, end caps, or adhesive. All configurations conform to ISO/JIS B 1192 dimensional standards.

Round-flange (LMF) variants offer the most uniform bolt-load distribution and are preferred where maximum moment resistance is required. Diamond-flange (LMK) variants reduce the radial envelope of the bolt pattern, allowing closer bearing spacing. Square-flange (LMH) variants provide four bolt points at 90° intervals and resist bearing rotation under torsional loads.

LMF/LMK/LMH...UU 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 206–4700 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 Standard 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)
LMF6UU LMK6UU LMH6UU 6 12 19 22 20 4 206 265 24
LMF8UU LMK8UU LMH8UU 8 15 24 28 24 4 274 392 37
LMF10UU LMK10UU LMH10UU 10 19 29 32 29 4 372 549 72
LMF12UU LMK12UU LMH12UU 12 21 30 32 32 4 510 784 76
LMF13UU LMK13UU LMH13UU 13 23 32 33 33 4 510 784 88
LMF16UU LMK16UU LMH16UU 16 28 37 37 38 5 774 1180 120
LMF20UU LMK20UU LMH20UU 20 32 42 42 42 5 882 1370 180
LMF25UU LMK25UU LMH25UU 25 40 59 59 51 6 980 1570 340
LMF30UU LMK30UU LMH30UU 30 45 64 64 60 6 1570 2740 470
LMF35UU LMK35UU LMH35UU 35 52 70 70 67 6 1670 3140 650
LMF40UU LMK40UU — 40 60 80 80 75 6 2160 4020 1060
LMF50UU LMK50UU — 50 80 100 100 92 6 3820 7940 2200
LMF60UU LMK60UU — 60 90 110 110 106 6 4700 10000 3000
LMF/LMK/LMH...UU dimensional specification drawing

🔭 Materials & Construction

All LMF/LMK/LMH bearings use GCr15 chrome-bearing steel (AISI 52100 / DIN 100Cr6), through-hardened to HRC 58–64 and precision-ground on all functional surfaces. Ball tracks are finish-ground to Ra 0.2 µm. The flange face is ground perpendicular to the bore axis to a runout tolerance of 0.02 mm for bore sizes up to 30 mm.

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

⚙

CNC Machining Centres

Flanged linear bearings provide a positive axial stop against the housing shoulder, eliminating the need for snap rings in high-speed spindle carriage and tool-change axis applications where axial retention under reversal loads is critical.

📈

Packaging & Labelling Machinery

High-cycle pick-and-place heads and label applicators use flanged linear bearings to achieve rapid, repeatable shaft insertion from one direction — the flange face acts as a hard stop that sets the bearing depth without measurement tools.

LMF/LMK/LMH...UU 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.

⚙ Housing Bore Tolerance

Machine the housing bore to H7 tolerance. For square-flange (LMH/LMHP) variants, also verify the flange seating face is square to the bore within 0.02 mm to prevent cocking the bearing on assembly.

🔎 Selection Guide

First confirm the housing flange style and PCD from the specification table. Verify that outer diameter D and body length L match the housing bore and counterbore depth. If moment loads are present, calculate the equivalent bearing load using ISO 10285 before comparing with the dynamic load rating C.

①

Confirm Bore & Standard

Match bore diameter to shaft. Confirm ISO Standard 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...UU linear bearing assembly and housing

❓ Frequently Asked Questions

▶ What is the difference between LMF, LMK, and LMH flange styles?

LMF (round flange) has a circular flange with evenly spaced bolt holes — compact and easy to clock in any orientation. LMK (diamond/oval flange) has two bolt holes on opposite sides, reducing the radial footprint where adjacent components limit space. LMH (square flange) provides four bolt points at 90° intervals, giving the highest moment resistance and preventing bearing rotation under torsional loads.

▶ Can the LMF/LMK/LMH series replace standard LM...UU bearings in existing housings?

No. Flanged variants require a counterbored housing face to accept the flange. If your housing is machined for a plain LM...UU bearing without a counterbore, you must either re-machine the housing or use a flanged adapter plate. Outer diameter D is identical to the equivalent LM...UU, so the bore fit is unchanged.

▶ What bolt size should I use for the flange mounting holes?

Refer to the PCD and mounting-hole dimensions in the specification table for the selected bore size. Standard metric bolts (M3 to M10 depending on size) with spring washers are recommended. Use stainless fasteners in corrosive environments.

▶ Is the flange face perpendicular to the bore axis?

Yes. The flange face is ground perpendicular to the bore axis to a runout tolerance of 0.02 mm for bore sizes up to 30 mm and 0.03 mm for larger sizes. This ensures the shaft axis is perpendicular to the mounting face without additional shimming.

▶ What is the maximum axial load the flange can withstand?

The flange is designed to locate the bearing axially, not to carry sustained thrust loads. For intermittent axial retention (preventing bearing walk-out under reversal), the bolt preload through the flange is adequate. For sustained axial thrust, add a thrust washer or angular-contact element in series with the bearing.

📞 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…UU flanged recirculating linear ball bearing series — ISO Standard Flanged (JIS B 1192). 13 bore sizes. Dynamic load 206–4700 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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