Description/Basics
Maintenance-free plain bearing bushings are suitable for linear and rotary motion. Movement is ensured by gliding. Thus, no rolling components are necessary, as with a rolling bearing.
Plain bearings can be selected in various shapes, materials and sizes . Bearing bushings are also already available integrated into the housing to make assembly easy and convenient.
Maintenance-free plain bearings have the benefit of not requiring maintenance or only little maintenance due to their integrated lubrication properties. This means that an external lubrication system can be omitted, which would not only require extra installation space, but is often very costly.
In contrast to rolling bearings, gliding bearings can generally accommodate high load-bearing capacities due to the larger contact area and require reduced installation space. The service life of the plain bearing bushings must be calculated depending on the application, since various influencing variables, such as roughness, stroke or rotational speed, have an influence on the service life.

High-Performance Maintenance-Free Plain Bearing Bushings: Precision Engineered for Demanding Applications

Uncompromising Reliability in Motion Control

Our maintenance-free plain bearing bushes represent the pinnacle of engineered solutions for linear and rotary motion systems. Unlike rolling bearings that depend on complex rotating elements, these bushings operate on a precision gliding principle, eliminating the need for additional mechanical components. Engineered for durability and performance, they deliver exceptional load capacity within minimal installation space while operating completely maintenance-free— Engineering Advantages

Material Science Excellence

• Self-Lubricating Composites:
  Sintered bronze and copper alloys embedded with solid graphite lubricants ensure continuous dry operation.
• Advanced Polymers:
  POM (polyacetal) and PTFE (polytetrafluoroethylene) variants offer chemical resistance and ultra-low friction coefficients.
• Hybrid Solutions:
  Composite steel, aluminum with fluoroplastic coatings, and cast iron variants balance strength and lubricity for extreme conditions.

Precision Geometry & Configurations

• Design Flexibility:
  Straight, collared, flanged, and block-housing designs (integ separable) for seamless assembly.
• ISO Tolerance Matching:
  Manufactured to E7, G6, H7, h7, m6, r6 tolerances for perfect shaft compatibility.
• Surface Enhancements:
  Nickel or chrome-plated housings boost corrosion resistance in harsh environments.

Performance Parameters

| Dimension | Range (mm) | Max. Speed | |-----------------|------------|------------| | Inner Diameter (d) | 3 – 100 | | | Outer Diameter (D) | 4.6 – 120 | | | Length (L) | 3 – 188 | 3.33 m/s |

Why Choose Maintenance-Free Bushings?

• Zero Lubrication Systems:
  Integrated solid lubricants eliminate external oil/grease systems, reducing footprint and operational costs by up to 40%.
• Superior Load Distribution:
  300% larger contact area vs. rolling bearings enables higher static/dynamic loading without compromising compactness.
• Lifecycle Engineering:
  Service life is calculable based on stroke frequency, surface roughness (Ra ≤ 0.4 µm recommended), and RPM—enabling predictive maintenance.

Technical Specification Highlights (SHBZ/SHBR Series)

| Part No. | d (mm) | L (mm) | Housing Dia. | Stopper Screw | H7 Tolerance (mm) | |----------|--------|--------|--------------|---------------|-------------------| | SHBZ | 5 | 8-15 | 9 | M4×8 | +0.015/+0.006 | | | 10 | 10-25 | 12 | – | +0.018/+0.007 | | SHBR | 15 | 15-40 | 19 | – | +0.021/+0.008 | | | 25 | 25-50 | 33 | M5×8 | +0.025/+0.009 |

Notes: Housing dimensions and stopper screws are recommended values. SHBZ series requires rotation stopper screws for optimal stability.

• Heavy Machinery: Excavator joints, hydraulic cylinders
• Precision Automation: Robotics articulation, CNC guideways
• Transportation: Chassis linkages, marine equipment

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TKD Metadata

• Title: Maintenance-Free Plain Bearing Bushes | Bronze Alloy | Custom Tolerances
• Keywords:
• ISO-tolerance plain bushings
• Self-lubricating sintered bronze bearings
• H7/m6 tolerance bearing bushes
• Flanged collar bushings
• Maintenance-free gliding bearings
• Description:
  High-capacity maintenance-free plain bearing bushes with selectable E7/G6/H7 tolerances. Available in bronze, POM, and PTFE composites for 3–100mm shafts. Optimized for zero-lubrication operation.