Dongfeng Bearing
LM Series Linear Ball Bearing Bush
Chrome steel linear ball bearing bush covering shaft diameters 6β60 mm, available in open and closed types. Recirculating ball retainer design delivers smooth, low-friction linear travel for CNC, automation, and general machinery.
Highlights
- Shaft diameter range 6β60 mm covered under one LM series ordering system
- Outer ring and balls in GCr15 chrome steel, hardened to HRC 60β64
- 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 LM8βLM40
- 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
| Shaft Diameter Range | 6 mm β 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 60β64 |
| Standard Reference | JIS B 1185 / ISO 10285 |
User Pain Point + Solution + Data
CNC router builders and automation integrators sourcing linear bearings face a common trade-off: specialty suppliers carry narrow size ranges, forcing multi-vendor procurement for a single machine that uses 6 mm shafts on a 3D printer axis and 40 mm shafts on a heavy-duty slide. The LM series covers 6β60 mm shaft diameters in one product family, with GCr15 chrome steel outer rings hardened to HRC 60β64 and PA66-GF retainers that hold ball pitch under thermal cycling. The LM16UU delivers 980 N dynamic load at a fraction of the cost of profile-rail carriages. Both closed (UU) and open (OP) types share identical envelope dimensions per JIS B 1185, so a housing bored for one type accepts the other without modification.
Complete Specifications
| Parameter | Value |
|---|---|
| Shaft Diameter Range | 6 mm β 60 mm |
| Outer Ring Material | Chrome Steel GCr15 (52100 equiv.) |
| Ball Material | Chrome Steel GCr15 |
| Retainer Material | PA66-GF Glass-Fiber Nylon |
| Precision Grade | Normal / H5 (selectable) |
| Types Available | Closed (UU), Open (OP) |
| Dynamic Load Rating (LM16UU) | 980 N |
| Hardness (Outer Ring) | HRC 60β64 |
| Standard Reference | JIS B 1185 / ISO 10285 |
Product Advantages
Single-Supplier Size Coverage
One LM series spans 6 mm through 60 mm. A machine builder using LM8 on a 3D printer Z-axis and LM40 on a press slide can source both from the same production line, with consistent material spec and QC baseline.
6β60 mm RangeGCr15 Chrome Steel, HRC 60β64
Outer ring and balls are both GCr15 (52100 equivalent), induction-hardened to HRC 60β64. The retainer is PA66-GF glass-fiber nylon, which maintains ball spacing under thermal cycling without warping.
GCr15 / HRC 60β64UU and OP Share Envelope
Closed type (UU) carries double rubber seals for dust resistance; open type (OP) has a longitudinal slot for split-housing installation and angular compensation. Both use the same outer dimensions-no housing redesign when switching types.
UU & OPJIS B 1185 Interchangeable
Dimensions follow JIS B 1185 / ISO 10285. Drop-in replacement for THK, IKO, and MISUMI LM bearings of the same size. Verify shaft tolerance h6 for correct running clearance.
JIS StandardEnterprise Strength
Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. - established 2014, 10+ years in linear motion bearing manufacturing. Our 5,000 mΒ² Xiamen facility operates 12 production lines with 200+ employees. The linear bearing cell produces LM/LME/LMF/LMK series at 150,000+ pieces per month.
Certifications: ISO 9001:2015, CE conformity, SGS factory audit. Export markets: 50+ countries including Germany, Italy, USA, Japan, South Korea, and Brazil.
Pre-sales: Application load-life calculation and bearing size selection. After-sales: 18-month warranty, technical travel-life estimation service.
Manufacturing, Exhibition & Quality Control
Production Process & Quality Assurance
Process: GCr15 raw tube -> CNC turning (outer ring, raceway groove) -> induction hardening (HRC 60β64) -> precision grinding (raceway) -> ball circuit assembly with PA66-GF retainer -> seal installation (UU type) -> 100% running smoothness test -> packaging.
Quality testing: Bore and outer diameter verified on air gauges (Β±2 Β΅m), dynamic load validated on endurance rig, seal effectiveness tested with dust ingress simulation. Exhibitions: Regularly exhibited at PTC Asia (Shanghai), CIMT (Beijing), and Maker Faire Shenzhen.
FAQ
What is the MOQ and typical lead time?
Standard MOQ is 100 pcs per shaft diameter and type. For sizes in stock (LM6βLM30 range most common), lead time is 7β15 business days. Larger or less common sizes (LM40βLM60) are typically 20β30 days. Sample quantities of 10β20 pieces available for qualified buyers.
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.
How are LM bearings packaged for export?
Individual anti-corrosion oiled wrapping in plastic bags, then packed in partitioned cartons (50 pieces per carton for LM6βLM16, 25 pieces for LM20βLM30, 10 pieces for LM40βLM60). Wooden pallet packing available for bulk export orders.
What payment methods do you accept?
T/T (30% deposit, 70% before shipment). L/C at sight for orders above USD 15,000. PayPal for sample orders under USD 2,000. Western Union for small orders on request.
Do you offer OEM branding and custom packaging?
Custom logo engraving on outer ring available for 200+ piece orders. OEM branded packaging with buyer design available for 500+ piece orders. Custom seal colors and retainer materials can be discussed for high-volume orders.
Request a Quote for LM Series Bearings
Send your shaft diameter, type (UU or OP), quantity, and any OEM requirements - we reply within one business day with FOB Xiamen pricing and availability.
Request a Quote
