Dongfeng Bearing
LM Series Linear Ball Bearing Bush
Chrome steel linear ball bearing bush covering shaft diameters 6–60 mm, available in open and closed types. Recirculating ball retainer design delivers smooth, low-friction linear travel for CNC, automation, and general machinery.
Key Features
- Shaft diameter range 6–60 mm covered under one LM series ordering system
- Outer ring and balls in GCr15 chrome steel, hardened to HRC 60–64
- Closed type (UU) with rubber end seals and open type (OP) share identical outer dimensions
- PA66-GF glass-fiber nylon retainer maintains ball pitch under thermal cycling
- Dimensionally interchangeable with JIS B 1185 and ISO 10285 counterparts
- MOQ 100 pcs per size; H5 precision grade available on request for LM8–LM40
- Individual plastic bag packaging; bulk export carton packing for volume orders
- Used in CNC routers, 3D printer carriages, pick-and-place gantries, and automation slides
Common Sourcing Problems & How We Solve Them
Buyer Pain Points
- Inconsistent dimensional tolerances across batches cause machine downtime and re-work costs
- Suppliers unable to provide material certs, inspection reports or CE documentation for customs clearance
- Long lead times and high MOQ requirements make sample evaluation and first orders difficult
Dongfeng Solution
- ISO 9001:2015 process controls with CMM dimensional inspection on every production batch
- Full documentation package: material cert, SGS test report, CE declaration, packing list on request
- Flexible MOQ from 1 piece for samples; bulk order lead time 15–20 working days
Performance Data
- 10+ years of linear motion component manufacturing — 50+ export markets served
- Hardness tested to HRC 58–62; dimensional tolerance held to JIS / ISO / DIN standard grade
- CE & SGS certified; ISO 9001:2015 quality management system in production
Utility record
| Shaft Diameter Range | 6 mm – 60 mm |
|---|---|
| Outer Ring Material | Chrome Steel GCr15 (52100) |
| Ball Material | Chrome Steel GCr15 |
| Retainer Material | PA66-GF (Glass-Fiber Nylon) |
| Precision Grade | Normal / H5 |
| Types | Closed (UU), Open (OP) |
| Dynamic Load Rating (LM16UU) | 980 N |
| Hardness (Outer Ring) | HRC 60–64 |
| Standard Reference | JIS B 1185 / ISO 10285 |
Application fit notes
LM Series Linear Ball Bearing Bush
The LM series covers shaft diameters from 6 mm up to 60 mm in a single product family, using a chrome steel (GCr15 / 52100) outer ring with a polymer-caged recirculating ball retainer. Closed type (LM..UU) suits dusty or lightly wet environments; open type (LM..OP) fits into split or adjustable housings where angular compensation is needed. Both types share the same envelope dimensions, making them interchangeable with JIS B 1185 and ISO counterparts from other sources.
Specifications
| Parameter | Value |
|---|---|
| Shaft Diameter Range | 6 mm – 60 mm |
| Outer Ring Material | Chrome Steel GCr15 (52100 equiv.) |
| Ball Material | Chrome Steel GCr15 |
| Retainer Material | Glass-Fiber Reinforced Nylon (PA66-GF) |
| Precision Grade | Normal / H5 (selectable) |
| Types Available | Closed (UU), Open (OP) |
| Dynamic Load Rating (LM16UU) | 980 N |
Key Features
Wide Diameter Coverage
One ordering system spans 6–60 mm shaft sizes. Buyers can source the full range from a single supplier, simplifying procurement and reducing approved-vendor overhead.
6–60 mmChrome Steel Construction
GCr15 outer ring hardened to HRC 60–64; balls also GCr15. This combination gives consistent surface hardness and load-bearing performance across the full diameter range.
GCr15 / HRC 60-64Open and Closed Types
Closed (UU) carries a rubber seal on each end; open (OP) has a longitudinal clearance slot. Both share identical outer dimensions, so switching type does not require a new housing.
UU & OP; OPVolume Production Ready
MOQ starts at 100 pcs per size. Packaging in individual plastic bags inside outer cartons; bulk export packing available for high-volume shipments.
MOQ 100 pcsTypical Applications
LM series bushings are found in CNC router Z-axis slides, 3D printer carriage rails, pick-and-place gantries, semiconductor wafer handlers, and general industrial automation wherever a smooth shaft-and-bush linear guide is needed at cost. The 6 mm size suits small-form-factor equipment; the 60 mm suits heavier press or forming machine slides.
FAQ
What is the MOQ and typical lead time?
Standard MOQ is 100 pcs per shaft diameter and type. For sizes in stock (LM6–LM30 range most common), lead time is 7–15 business days. Larger or less common sizes (LM40–LM60) are typically 20–30 days. Full details available upon request.
Are these compatible with standard linear shafts and housings?
Yes. LM series dimensions follow JIS B 1185 / ISO 10285, so they are dimensionally interchangeable with THK, IKO, and Misumi equivalents. Verify shaft tolerance h6 for correct clearance fit.
Can H5 precision grade be supplied for high-accuracy applications?
H5 grade is available on request for shaft diameters LM8 through LM40. Price and lead time differ from normal grade; please inquire with your target size and quantity.
Request Pricing or a Sample
Send your shaft diameter, quantity, and required type (UU or OP) — we will reply within 1 business day with FOB Xiamen pricing and availability.
Request a QuoteWhy Buyers Choose Dongfeng Bearing
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. — direct factory, 10+ years precision linear motion manufacturing
ISO 9001:2015, CE Declaration of Conformity, SGS test reports. Documentation available for EU and North American import requirements.
12 precision grinding and CNC machining lines; monthly output 500,000+ pieces across linear bearing and guideway series.
Germany, USA, Japan, South Korea, India, Southeast Asia and 40+ other countries. FOB Xiamen with DHL / FedEx / sea freight options.
Technical selection support before order. Dimensional drawing, material cert and inspection report with shipment. 12-month warranty on manufacturing defects.
Manufacturing Process & Quality Assurance
Precision Machining
CNC grinding centers hold ball raceway geometry to ±0.003 mm. Induction hardening targets contact zones to HRC 58–62 without embrittling the full body.
CMM Dimensional Inspection
Every batch passes coordinate measuring machine (CMM) verification. Key dimensions — bore, OD, length, raceway radius — are logged against JIS / ISO tolerance bands.
Certification & QC
ISO 9001:2015 controls govern raw material intake, in-process check, and final inspection. SGS and CE documentation issued on request for each shipment.
Trade Shows & Partnerships
Regular exhibitor at Canton Fair and Hannover Messe. Established supply partnerships with automation integrators and machine tool OEMs across Europe and Asia.
Customer Application Cases
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