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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 6–60 mm shaft diameters in one product family, with GCr15 chrome steel outer rings hardened to HRC 60–64 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.

980 NDynamic load (LM16UU)

6–60 mmShaft diameter range

HRC 60–64Outer ring hardness

JIS B 1185Dimensional standard

Complete 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	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 60–64
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.

6–60 mm Range

GCr15 Chrome Steel, HRC 60–64

Outer ring and balls are both GCr15 (52100 equivalent), induction-hardened to HRC 60–64. The retainer is PA66-GF glass-fiber nylon, which maintains ball spacing under thermal cycling without warping.

GCr15 / HRC 60–64

UU 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 & OP

JIS 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 Standard

Enterprise Strength

Xiamen Dongfeng Bearing Mechanical & Electrical Co., Ltd. - established 2014, 10+ years in linear motion bearing manufacturing. Our 5,000 m² 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 60–64) -> 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 (±2 µm), 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 (LM6–LM30 range most common), lead time is 7–15 business days. Larger or less common sizes (LM40–LM60) are typically 20–30 days. Sample quantities of 10–20 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 LM6–LM16, 25 pieces for LM20–LM30, 10 pieces for LM40–LM60). 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

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