LM25UU / LBD25UU / LM25UU-OP Linear Motion Ball Bearing / Linear Bushing 25*40*59mm

LM25UU, LBD25UU and LM25UU-OP are standard 25mm bore metric linear ball bearings with three different structural types to satisfy diverse installation and clearance demands. All series adopt multiple groups of circulating steel ball groups inside the outer shell, delivering smooth low-friction linear reciprocating movement and only bear radial load.

• LM25UU: Standard closed integral outer shell, double ends rubber dust seals, universal for ordinary linear sliding platforms with fixed clearance;
• LBD25UU: Flanged integrated closed linear bushing, mounting flanges on both sides for direct surface installation without extra positioning sleeves;
• LM25UU-OP: Open slotted adjustable gap structure, the gap can be reduced by tightening the housing clamp to eliminate play, ideal for high-precision positioning equipment.

Outer shell adopts high-strength cold-drawn steel, nylon retainer evenly separates chrome steel balls, pre-filled long-life lithium grease inside. Double NBR dust seals block dust, cutting fluid and debris, widely used for CNC equipment, electronic automation assembly lines, testing jigs, packaging machinery and precision sliding transmission platforms with 25mm guide shafts.

Matching Shaft Diameter d: 25 mm

Standard Radial Clearance: CN normal clearance

Ball Material: GCr15 bearing steel

Retainer Material: Wear-resistant PA66 nylon

Seal: Double-sided NBR dust-proof rubber seal

Max Linear Speed: 1.5 m/s

Working Temperature: -20℃ ~ 80℃

Shaft Surface Requirement: HRC60~64 mirror superfinishing

Outer Diameter D: 40 mm

Total Length L: 59 mm

Dynamic Load Cr: 5.8 kN

Static Load C0r: 8.3 kN

Net Weight: 0.145 kg

Outer Flange Width W: 64 mm

Flange Thickness T: 7 mm

Outer Diameter D: 40 mm

Total Length L: 59 mm

Dynamic Load Cr: 5.8 kN

Static Load C0r: 8.3 kN

Net Weight: 0.182 kg

Outer Diameter D: 40 mm

Total Length L: 59 mm

Slotted open structure for clearance adjustment

Dynamic Load Cr: 5.4 kN

Static Load C0r: 7.8 kN

Net Weight: 0.138 kg

Complete dimensional drawings and load parameter tables of three models are available upon customer request.

1. Three structural versions (closed straight / flanged / open adjustable gap) cover all mainstream automation installation requirements, one-stop purchase for different equipment design schemes
2. Circulating multi-row steel ball layout provides uniform radial bearing capacity, ultra-low friction coefficient, smooth silent reciprocating sliding without jamming
3. Double-sided integrated NBR dust seals isolate workshop dust and coolant, lock internal lubricating grease and extend maintenance cycle
4. High toughness cold-drawn steel outer shell with stable dimensional tolerance, good rigidity and deformation resistance under long-term continuous operation
5. PA66 nylon ball retainer evenly limits steel balls, avoids collision noise and prevents ball falling during disassembly
6. Customizable options: stainless steel anti-rust shell, food-grade lubricant, special enlarged C3 clearance, OEM laser marking and high-temperature resistant FKM seals

Effectively improve equipment linear positioning precision and reduce spare part stocking varieties for automated production lines

This LM25UU / LBD25UU / LM25UU-OP three-type linear ball bearing set is widely matched for the following precision automation equipment:

• CNC engraving machines, small milling machine feed axis linear sliding assemblies
• 3C electronic automatic assembly equipment, handling gantry and precision testing jigs
• Printing machinery, food packaging equipment high-speed linear transmission mechanisms
• Medical inspection equipment, laboratory precision sliding platforms and detection fixtures
• Woodworking cutting equipment, injection molding auxiliary linear moving components
• Aftermarket replacement spare parts for 25mm diameter linear guide shaft sliding equipment

Ideal multi-structure linear bushing solution for diverse installation and high-precision clearance adjustment industrial automation scenes

• 25 years of professional standard linear ball bearing manufacturing experience
• Three models fully interchangeable with international standard LM/LBD series linear bushings, consistent dimensional tolerance and sliding smoothness
• Complete OEM & ODM customized service supporting stainless steel shell, special lubricant and clearance customization
• Full-process strict inspection: raw material hardness, inner hole superfinishing precision, sealing tightness and reciprocating sliding cycle testing before delivery
• Professional linear motion engineering team provides shaft & housing tolerance matching guidance within 24 hours
• Stable mass production capacity with preferential bulk wholesale price for long-term automation equipment manufacturers

We focus on stable low-noise sliding performance, durable sealing and long-term win-win cooperation with global industrial buyers

• Raw material chemical composition and surface hardness inspection of cold drawn steel and GCr15 chrome steel balls
• Precision turning and inner hole mirror superfinishing processing for linear bearing outer shell
• Standardized stress relief heat treatment process to stabilize shell deformation resistance
• Comprehensive performance testing: radial clearance uniformity, sliding noise, dust-proof durability, dynamic and static load capacity
• Uniform grease filling volume inspection for double sealed linear bushings
• Final dimensional, appearance and marking re-inspection before anti-rust packaging and shipment

Every batch of linear bearings passes full sampling reciprocating cycle durability test to guarantee stable long-time smooth sliding performance

If you need high-quality 25mm closed, flanged and open adjustable gap linear ball bearings for CNC and electronic automation equipment, send your inquiry to us directly.

You will receive full professional supporting services after submitting inquiry:

• Fast official factory quotation reply within 24 hours
• One-on-one shaft & housing tolerance matching technical support by linear motion professional engineers
• Customized bearing solution suggestions including stainless steel shell and high-temperature resistant sealing variants
• Competitive direct factory bulk wholesale price for mixed three-model combined bulk orders

Send your required quantity of each model and equipment working environment to obtain detailed formal offer

Q1: What is the difference between LM25UU and LM25UU-OP?
A1: LM25UU is fully closed fixed clearance type; LM25UU-OP has open slotted structure, which can clamp housing to reduce clearance and eliminate play for high-precision equipment.

Q2: What is the feature of LBD25UU flanged linear bushing?
A2: Integral mounting flange on both ends, can be fixed directly on the equipment surface without additional positioning sleeves, convenient for thin plate installation.

Q3: What hardness does the matching linear guide shaft need to reach?
A3: The shaft surface needs HRC 60–64 quenching hardness with mirror superfinishing to extend linear bushing service life.