CuSn8

CuSn8

High-Performance Self-Lubricating Bronze Bushing Solutions & Technologies. Minimize downtime, extend service life, and reduce costs for dynamic applications.

CUSN8 bronze bearing component made from CUSN8 material; metric Wrapped Bronze Bush bushes. Bronze plain bearing bushings with lubrication pockets. Manufacturer.

CuSn8 wrapped bronze bushings, Heavy-Load Metallic Sleeve Bearings, Inch Sizes and metric Size, Metallic Sleeve Bearings, High Performance Cusn8 Bronze Bushing, Bronze Bearing: CuSn8 with Grease Reservoirs

Bronze Bushings with Through Holes Materials These bushings, similar to the bronze Series, are crafted from bronze bands comprising 92% copper and 8% tin. They are designed with through holes that are filled with grease, offering significantly higher retention capacity compared to traditional bushings.

Corrosion Resistance The cusn8 series bushings exhibit excellent corrosion resistance due to their robust base material composition, making them well-suited for harsh and dirty environments.

Temperature The operational temperature range of these bushings extends from -100 ºC to 200 ºC, which can vary depending on the type of lubricant applied.

Applications These bushings are ideally used in: ✔ Construction machinery ✔ Agricultural machinery ✔ Trailers ✔ Quarries ✔ Glass industry

CuSn8, also known as Phosphor Bronze Grade II, is a widely used tin bronze alloy primarily composed of copper and tin, with a small addition of phosphorus. The alloy is known for its excellent combination of strength, wear resistance, and corrosion resistance. Here are the detailed specifications and material data for the CuSn8 alloy:

Equivalents WF-WB802 FB092 Straight bushing Low-maintenance Bronze (CuSn8)/Bronze (CuSn8)

Using high-quality grease or oil as a lubricant minimizes friction and wear by separating the bronze bushing from its shaft.

Benefits of wrapped bronze bushings:

  • Tolerant of contaminated environments
  • Resistant to shock loads and vibrations at low speeds
  • Good resistance to corrosion

Applications:

  1. Agricultural machinery
  2. Hoisting equipment
  3. Construction machinery
  4. Forestry machinery

Chemical Composition

  • Copper (Cu): 91.0% – 93.0%
  • Tin (Sn): 7.0% – 9.0%
  • Phosphorus (P): 0.03% – 0.35%

Mechanical Properties

  • Tensile Strength: 370 – 470 MPa
  • Yield Strength (0.5% extension under load): ≥ 250 MPa
  • Elongation (A5, 5.65√So): 20% – 30%
  • Hardness: 90 – 150 (HV)

Physical Properties

  • Density: 8.8 g/cm³
  • Melting Point: 850 – 1000°C
  • Thermal Conductivity: 60 W/(m·K)
  • Electrical Conductivity (at 20°C): 15% IACS

Features

  • Corrosion Resistance: Good resistance to corrosion in seawater, industrial atmospheres, and brines.
  • Machinability: Fair, but it produces a chip that breaks easily.
  • Weldability: Soldering and brazing are excellent; oxyacetylene welding is fair, but electric arc welding is not recommended.
  • Formability: Good in the annealed condition.

Applications

  • Marine Applications: Due to its corrosion resistance in seawater.
  • Electrical Components: Connectors, springs, and contacts due to its good electrical conductivity and fatigue resistance.
  • General Industrial: Bushings, gears, and bearings in medium-load and speed applications.

This alloy is a popular choice for components requiring a combination of strength and resistance to wear and corrosion, particularly in marine environments and wear-sensitive applications.

Lubrication pockets in CuSn8 tin bronze wrapped bronze bushings enhance their service life, making them ideal for situations where heavy contamination necessitates frequent relubrication. The bushings’ sliding surfaces feature diamond-shaped pockets designed to be filled with grease, serving as lubricant reservoirs that gradually dispense lubrication during use. viiplus.com provides a comprehensive selection of both straight and flanged wrapped bronze bushings, with straight bushings produced to ISO 3547-1 standards. The benefits of CuSn8 tin bronze wrapped bronze bushings include their tolerance to dirty environments, their capacity to withstand shock loads and vibrations at low speeds, and their strong resistance to corrosive conditions. These bushings are crafted entirely from CuSn8 bronze, manufactured from bronze strips that are then wrapped and meticulously calibrated. They are especially suited for equipment in highly contaminated areas where shock loads and vibrations are prevalent, such as in agricultural, hoisting, construction, and forestry machinery.

These sleeve bearings made of metallic CuSn8 bronze are well-suited for demanding heavy-load applications that involve reciprocating, oscillating, or intermittent movement. They excel in harsh conditions found in aerospace equipment, oil and gas systems, and automotive powertrains.

Mechanical Properties

Type Tensile Strength (N/mm²) Elongation (%) Yield Strength (N/mm²)
FB090 450 55 250
FB092 300 55 250
FB08G 420 5 230
FB09G 450 10 250

Physical Properties

Type Specific Gravity (g/cm³) Linear Expansion Coefficient (20–300°C) ×10⁻⁶/°C Thermal Conductivity (20°C) W/m·K Electrical Conductivity (20°C) %IACS Elastic Modulus (kN/mm²)
FB090 8.9 18.2 60 6.5 115
FB092 8.9 18.2 60 6.5 115
FB08G 7.8 22 70 7.8 108
FB09G 8.0 18.2 60 6.5 115

Friction Performance

Type Max. Dynamic Load (N/mm²) Max. Sliding Speed (Dry, m/s) Max. Sliding Speed (Oil, m/s) Operating Temperature (°C)
FB090 75 — 2.5 -80 ~ +200
FB092 60 — 2.5 -100 ~ +200
FB08G 65 0.4 4 -100 ~ +260
FB09G 65 0.2 4 -100 ~ +260

Bearing Hardness

Type Category Hardness (HB)
FB090 Standard 90–120
FB092 Special 125–155
FB08G Standard 60–90
FB09G Standard 90–120
FBB090 Standard 70–100

Bearing Material Composition

Type Category Material Grade Chemical Composition (%)
FB090 / FB092 Standard CuSn6.5P Cu: Remainder, Sn: 6–7, P: 0.1–0.25, Others ≤0.1
Special I CuSn8P Cu: Remainder, Sn: 7–9, P: 0.01–0.35, Others ≤0.2
Special II H68 (CuZn31Si) Cu: 66–70, Zn: Remainder, Si ≤0.8, Others ≤0.5
FB08G Standard CuSn10Pb10 + Graphite Cu: Remainder, Sn: 9–11, Pb: 9–11, Others ≤0.5
FB09G Standard CuSn6.5P + Graphite Cu: Remainder, Sn: 6–7, P: 0.1–0.25, Others ≤0.1
Special CuSn8P + Graphite Cu: Remainder, Sn: 7–9, P: 0.01–0.35, Others ≤0.2

Bearing Wall Thickness and Oil Hole Depth

Type Wall Thickness (mm) Oil Hole Depth (mm)
FB090 1.0 0.30–0.40
1.5 0.40–0.50
2.0 0.50–0.60
2.5 0.60–0.70
FB09G / FB08G 0.65 0.15–0.30
1.0 0.30–0.40
1.5 0.40–0.50
2.0 0.40–0.50
2.5 0.40–0.50
straight diamond bronze bearing
Flanged Bronze Bearing made of CuSn8 with Grease Reservoirs Bronze Plain Bearing Wrapped Bronze With Lubrication diamond pattern - low-maintenance
Straight Bronze Bearing made of CuSn8 with Grease Reservoirs

Lubrication, whether with grease or oil, plays a crucial role in minimizing friction and wear by creating a barrier between a bronze bushing and its corresponding shaft, ensuring smooth operation.

When selecting between CuSn8 and CuSn6.5 bronze for plain bearings, wrapped bushings, split flange, or straight designs, it’s important to consider the specific application requirements, such as load, speed, lubrication, and environmental conditions. Here’s a breakdown of the two materials and their typical uses:

CuSn8 (Tin Bronze – 8% Tin)

  • Composition: 8% tin, balance copper.

  • Properties:

    • Higher tin content provides better strength, hardness, and wear resistance compared to CuSn6.5.

    • Excellent corrosion resistance.

    • Good fatigue resistance and load-carrying capacity.

    • Suitable for high-load and low-speed applications.

  • Applications:

    • Heavy-duty plain bearings.

    • High-load industrial machinery.

    • Applications requiring higher wear resistance and durability.

    • Commonly used in wrapped bushings, flange bearings, and straight bushings for demanding environments.

CuSn6.5 (Tin Bronze – 6.5% Tin)

  • Composition: 6.5% tin, balance copper.

  • Properties:

    • Slightly lower tin content compared to CuSn8, resulting in slightly lower hardness and wear resistance.

    • Good machinability and formability.

    • Excellent corrosion resistance and anti-seizure properties.

    • Suitable for moderate loads and speeds.

  • Applications:

    • Medium-duty plain bearings.

    • General-purpose wrapped bushings, flange bearings, and straight bushings.

    • Applications where cost-effectiveness and moderate performance are required.

Comparison

Property CuSn8 CuSn6.5
Tin Content 8% 6.5%
Hardness Higher Slightly lower
Wear Resistance Better Good
Load Capacity Higher Moderate
Cost Higher Lower
Applications Heavy-duty, high-load Medium-duty, general-purpose

Selection Guide

  • Choose CuSn8 if:

    • The application involves high loads, low speeds, or harsh conditions.

    • Superior wear resistance and durability are required.

    • The bearing will operate in demanding environments.

  • Choose CuSn6.5 if:

    • The application involves moderate loads and speeds.

    • Cost-effectiveness is a priority.

    • The bearing will operate in less demanding conditions.

Bearing Types

Both materials can be used in:

  • Wrapped Bushings: Suitable for light to medium loads, easy to install.

  • Plain Bearings: Used in rotating or sliding applications.

  • Split Flange Bearings: Allow for easy installation and removal.

  • Straight Bushings: Used in linear or rotational applications.

Bronze Bearing: CuSn8 with Grease Reservoirs

The choice between CuSn8 and CuSn6.5 depends on the specific requirements of your application. For heavy-duty or high-performance applications, CuSn8 is the better choice. For general-purpose or cost-sensitive applications, CuSn6.5 is often sufficient. Always consider factors like load, speed, lubrication, and environmental conditions when making your selection.

Bronze Bearings & Bushings

With focus on Premium Sleeve Bushings

Bearing Bronze — Extensive Inventory Of Sizes. Our range of CuSn8 bronze bearings (rolled phosphor bronze alloy material) are extremely versatile and well suited for a wide range of applications. Cusn8 wrapped bronze bearings are a type of bearing that combines the properties of bronze and copper for high-performance applications. Buy Direct Bearings & Bushings from viiplus.com and Save. Get A Quick Quote from the Team of Bearing and Bushing Experts Today.

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CuSn8 Bronze Bushing with Joint TypeCuSn8 (also known as phosphor bronze grade II or DIN 2.1030) is a popular tin bronze alloy composed primarily of 92% copper (Cu) and 8% tin (Sn), with trace phosphorus for enhanced strength and corrosion resistance. It’s widely used for manufacturing bushings (sleeve bearings) due to its excellent wear resistance, high load capacity, low friction, and ability to operate in temperatures up to 200–400°C, depending on lubrication. These bushings are self-lubricating when designed with grease reservoirs, indents, or perforations, making them ideal for heavy-duty, low-speed applications like construction machinery, agriculture, mining, and automotive components.The “joint type” in your query likely refers to the split joint design common in CuSn8 wrapped bronze bushings. This is a type of wrapped (or rolled) bushing where a thin strip of CuSn8 bronze sheet is cold-formed into a cylindrical shape, creating a longitudinal seam (joint) along the length. The joint is typically secured by welding, adhesive, or simply left as a butt joint for flexibility. This split construction allows for:

  • Easy installation and removal (press-fit or clip-in).
  • Compensation for thermal expansion.
  • Cost-effective manufacturing compared to fully machined or cast bushings.

Key Features of CuSn8 Bronze Bushings with Split Joint

  • Material Properties: High tensile strength (up to 400 MPa), good fatigue resistance, and corrosion resistance in harsh environments (e.g., dirty or humid conditions).
  • Lubrication Options: Often include diamond-shaped indents, perforations, or grease holes for retaining lubricants, extending maintenance intervals.
  • Dimensions: Standard metric sizes from inner diameter (ID) 10 mm to 300 mm; custom sizes available. Wall thickness is typically thin (0.5–2.5 mm) for lightweight design.
  • Standards: Compliant with DIN 1494 / ISO 3547 for sliding bearings.
  • Variants:
    • Plain Cylindrical: Basic split sleeve for radial loads.
    • Flanged: Adds an integrated flange for axial location and thrust support.
    • Perforated or Grooved: Enhances lubrication retention.

Comparison of Common CuSn8 Bushing Types

Type
Joint/Split Design
Lubrication Features
Best For
Load Capacity
Maintenance Level
Wrapped Split Cylindrical
Yes (longitudinal joint)
Grease indents or holes
General heavy-load, oscillating motion
High
Low (self-lubing)
Flanged Wrapped
Yes (with flange)
Diamond pockets or perforations
Applications needing axial support
Very High
Low
Solid Machined
No (seamless)
Custom grooves
Precision, high-speed uses
Medium-High
Medium
Graphite-Plugged
Yes or No
Embedded solid lubricant
Dry or poorly lubricated environments
High
None

Applications

  • Construction & Mining: Excavators, cranes, and hoists for slow, high-load pivots.
  • Agriculture: Tractor linkages and harvesters.
  • Automotive: Suspension bushings and steering components.
  • Other: Glass industry furnaces, trailers, and machine tools.

Metal Bushing (Lubricated Metal) -Self-Lubricating Bushing Materials

Bushings are specialized, self-lubricating metal components widely utilized across various industries due to their durability and low maintenance requirements. Self-lubricating metal bushings are engineered to function without additional lubrication in numerous applications, thereby minimizing maintenance needs. These bushings are available in various series and configurations, such as flanged bushings and split bearings, to meet specific application requirements.

Metal-Polymer Anti-Friction Plain Bearings

Metal-Polymer Composite Self-lubricating Bushing Material

Steel Back + Porous Bronze Sinter + PTFE

Metal-Polymer Plain Bearings Grease Lubricated
Metal-Polymer Plain Bearings Grease Lubricated
Bronze Bearings made of CuSn8 with Lubrication Indents
Bronze Bearings and Bronze Sleeve Bushings made of CuSn8 with Lubrication Indents
Cast Bronze Bushings with Solid Lubricant Inserts
Cast Bronze Bearings with Solid Lubricant Inserts
Bimetal Plain Bearings
Steel + CuPb10Sn10 with indents
Steel Bronze Bushing
Steel Backing and Bronze Overlay
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lubrication-free Bearing bushing products

Self-lubricating Bushing For High Performance And Low Maintenance