CuSn8 Bronze Bearings with Grease Reservoirs and Lubrication Indents

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

CuSn8 bronze bearings are solid-strip tin bronze bushes available with grease reservoirs or lubrication indents, designed for grease-lubricated plain bearings operating under relatively high loads and low speeds.

Meta description: CuSn8 bronze plain bearings with grease reservoirs and lubrication indents — load ratings, temperature range, sliding speed, shaft recommendations and industrial applications.

What Is a CuSn8 Bronze Bearing?

CuSn8 is a tin bronze (phosphor bronze family) rolled strip material with a nominal 8% tin content. Bearings made from this material are formed from solid bronze strip and are supplied in two lubrication-oriented designs:

• With grease reservoirs — perforated strip that holds grease in larger reservoirs. Longer relubrication intervals are possible because dirt and debris are swept into the perforations instead of remaining at the sliding interface.
• With lubrication indents — strip with pressed indents that retain lubricant on the sliding surface. This version is suited to rough operating conditions and accepts oil or grease lubrication.

Grade equivalence (indicative): CuSn8 corresponds broadly to EN CW453K and UNS C52100 (wrought phosphor bronze, 8% Sn). Verify the exact temper and standard with VIIPLUS’s test certificate.

Bearing Properties

Operating Performance by Lubrication

Counter-Surface Recommendations

• Shaft surface roughness Ra ≤ 0.8 µm.
• Shaft surface hardness > 200 HB (normal duty); > 350 HB is recommended where a longer service life is required.

Applications

Industrial machine elements where grease-lubricated plain bearings run under relatively high loads and low speeds:

• Mechanical handling and lifting equipment
• Hydraulic cylinders
• Pneumatic equipment
• Medical equipment
• Textile machinery
• Agricultural equipment

Forms and Customization

• Grease reservoir type: cylindrical bushes with non-standard dimensions and customized bearing designs made to order.
• Lubrication indent type: standard cylindrical bushes; made-to-order cylindrical bushes with non-standard dimensions, flanged bushes, sliding plates and customized designs.

FAQ

Can CuSn8 bearings run dry?

No. These designs are intended for grease or oil lubrication; dry operation performance is rated poor. For maintenance-free dry running, select a graphite-plugged self-lubricating bronze instead.

What is the difference between grease reservoirs and lubrication indents?

Reservoir types hold larger grease volumes and sweep debris into perforations, extending relubrication intervals; indent types distribute lubricant across the sliding surface and also accept oil lubrication.

What shaft hardness is required?

Above 200 HB for normal duty and above 350 HB where longer service life is targeted, with shaft roughness Ra ≤ 0.8 µm.

CuAl10Ni5Fe4 Aluminum Bronze Bushings: Composition, Properties, Applications

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

CuAl10Ni5Fe4 (C63000 / 2.0966) is a nickel-aluminum bronze used for bushings, bearings and wear components where high strength, abrasion resistance and seawater corrosion resistance are required.

Meta description: CuAl10Ni5Fe4 aluminum bronze bushing guide — chemical composition, mechanical and physical properties, grade equivalents, applications and available shapes.

Chemical Composition

Nearest International Specifications

Mechanical and Physical Properties

Why Use CuAl10Ni5Fe4 for Bushings?

Nickel raises the strength of the aluminum bronze without reducing ductility, toughness or corrosion resistance. The alloy naturally forms a protective alumina surface film that resists corrosion and stress corrosion cracking. These properties make the material suited to heavy loads, abrasive wear, friction and corrosive media such as seawater, and it retains mechanical properties at elevated temperatures.

Applications

Industrial

• Hydraulic bushings for earth-moving equipment
• Bushings and bearings in industrial machinery
• Heat exchanger flanges, headers and tanks
• Valve components: balls, seats, guides, plunger tips
• Structural members, pump shafts, aircraft parts
• Welded piping systems, gears, cams, pump parts

Marine

• Pump parts, bolts, nuts, propellers and ship propellers

Plumbing

• Faucets and plumbing fixtures

Shapes and Sizes of Oilless Aluminum Bronze Bushes

• Straight / sleeve bushes — for linear sliding motion with low friction.
• Flanged bushes — flange locates the bush and limits axial movement.
• Thrust washers — for axial load carrying.
• Slide plates — low-friction surfaces for sliding motion.

Available in standard and custom dimensions, metric and imperial. Typical production specialties include large-size centrifugal bushes, centrifugal rings and centrifugal bushing sleeves.

Related Nickel-Aluminum Bronze Alloys for Oilless Bushes

FAQ

Is CuAl10Ni5Fe4 the same as C63000?

CuAl10Ni5Fe4 is the DIN/EN designation; C63000 is the corresponding UNS designation used in North America. Composition ranges are similar but not identical — check the governing standard for the application.

Can it run without external lubrication?

As a plain material it requires lubrication; however, oilless variants with graphite plugs use the same base alloy and operate without external oil or grease.

Why is it used for propellers?

Its combination of strength, seawater corrosion resistance and erosion resistance suits propeller and pump components in marine service.

CuZn25Al5 Turned Bronze Sliding Bearings (DIN 1850 / ISO 4379)

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

CuZn25Al5 turned bronze sliding bearings are maintenance-requiring plain bearings engineered for high static loads, shock loads, contaminated environments and low-to-moderate sliding speeds.

Meta description: CuZn25Al5 turned bronze sliding bearings — load capacity, sliding speed, friction, temperature range, tolerances, mounting instructions and alloy comparison.

Material and Design

CuZn25Al5 (DIN 2.0598.03) is a high-strength copper-zinc-aluminum alloy turned into cylindrical bushes, flanged bushes, thrust washers and strips. Bearings are produced to order without exception; all special dimensions are available. The design is a maintenance-requiring sliding bearing suited to contaminated environments, with good corrosion resistance and low sensitivity to shock loads. Oil or grease lubrication is required; additional lubrication grooves or holes reduce relubrication intervals and improve lubricant distribution.

Bearing Properties

Tolerance Specifications

Tolerance values are as printed in the source data sheet (indicative). Confirm the intended meaning of s6/r6 (press-fit or shaft fit) with VIIPLUS before design release.

Shaft Material

• Hardness difference between shaft and bearing should be at least 100 HB where possible.
• Prefer hardened and ground shafts, surface roughness ≤ Rz 6.3.

Mounting Instructions

• Housing bore: installation chamfer approx. 1.5 mm × 15–45°.
• Shaft: installation chamfer 5 mm × 15°, edges rounded.
• Fitting mandrel: use an adequate fitting mandrel; grease lubrication of the outer surface may be necessary when mounting.

Comparison of Standard Bronze Alloys (Indicative, Cast Grades)

Preferred Use

Bearing arrangements with low speeds, pivoting or axial movements, shock loads and dirt loads; general-purpose arrangements in agricultural machinery, construction machinery and vehicle construction; applications requiring a simple design and low price; high- or low-temperature service; long-term applications where liquid-film (hydrodynamic) lubrication is maintained, such as water and steam turbines, generators, centrifugal pumps and heavy ship shaft bearings.

Service Life Factors

Specific bearing load, sliding speed, p·v value, material and surface roughness of the sliding partners, load zone allocation, duty cycle, temperature, lubrication, and operating conditions such as dirt ingress.

FAQ

Is CuZn25Al5 maintenance-free?

No. The standard alloy requires oil or grease lubrication. The data sheet lists lower load values for a maintenance-free design variant — confirm the variant with VIIPLUS.

What temperature range can it withstand?

−40 °C to +300 °C for the turned CuZn25Al5 bearing.

How are these bearings delivered?

Ready-to-install as standard; post-machining specifications are possible for certain bearing types — confirm with VIIPLUS.

CuSn5Zn5Pb5-C (CC491K) Gunmetal Bearing Alloy: Data and Applications

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

CuSn5Zn5Pb5-C (CC491K, EN 1982) is a leaded gunmetal casting alloy combining good machinability, self-lubricating character and corrosion resistance for general plain bearing service up to 200 °C.

Meta description: CC491K gunmetal bearing alloy — chemical composition, mechanical properties, grade equivalents (C83600, SAE 40, LG2), characteristics and working temperature limit.

Chemical Composition (%)

Mechanical Properties (Minimum Values)

Requirements apply to sizes up to and including 300 mm external diameter. For larger continuous castings, mechanical property requirements should be agreed between VIIPLUS and the purchaser.

Equivalent Specifications

Technical Characteristics

• Good machining properties.
• Good self-lubricating properties.
• Corrosion resistant.
• Working temperature should not exceed 200 °C / 392 °F.

Optional heat treatment at customer request: stress relieve.

Typical Plain Bearing Applications (Indicative)

• General cylindrical and flanged bushes in industrial machinery
• Pump and valve components
• Marine deck hardware and fittings
• Thrust washers and wear plates where moderate loads and lubrication are present

FAQ

Is CC491K the same as C83600?

CC491K (EN 1982) and C83600 (ASTM B505, SAE 40) are closely equivalent leaded gunmetal / red brass compositions; always verify the governing standard for the application.

Can gunmetal bearings run without lubrication?

The alloy has good self-lubricating character but is not a maintenance-free material; for dry-running service select a graphite-plugged variant.

What is the maximum operating temperature?

200 °C / 392 °F per the source data sheet.

CuAl10Fe5Ni5-C (CC333G) Nickel Aluminum Bronze for Marine and Heavy-Duty Bearings

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

CuAl10Fe5Ni5-C (CC333G, EN 1982) is a cast nickel-aluminum bronze combining good wear resistance, seawater corrosion resistance, erosion and cavitation resistance, and oxidation resistance up to 300 °C.

Meta description: CC333G nickel aluminum bronze — chemical composition, mechanical properties, grade equivalents (C95500, CAC703), characteristics for marine and heavy-duty bearing applications.

Chemical Composition (%)

Mechanical Properties (Minimum Values)

Requirements apply to parts with external diameter ≤ 300 mm; for larger sizes, values to be agreed at order placement.

Closest International Standards

Technical Characteristics

• Difficult machining properties (hard material; plan for carbide tooling).
• Good wear resistance.
• High corrosion resistance, especially to seawater.
• Oxidation resistance at high temperature.
• Resistant to temperatures up to 300 °C.
• Resistant to erosion and cavitation.

Optional heat treatments at customer request: stabilized (stress-relief) and dealuminization treatments.

Typical Applications (Indicative)

• Marine bearings and bushes: rudder stock bushes, propeller shaft bearings, deck equipment
• Heavy-duty industrial bushes under high loads, low speeds and abrasive conditions
• Pumps and valves in seawater service
• Self-lubricating graphite-plugged slide bearings for hydraulic steelwork and offshore equipment
• Erosion- and cavitation-prone components (impellers, wear rings)

FAQ

Is CC333G the same as C95500?

CC333G (EN 1982) and C95500 (ASTM B505) are closely equivalent nickel-aluminum bronze grades; verify the governing standard for the application.

Why use nickel aluminum bronze in seawater?

The protective alumina film plus nickel provides high corrosion resistance, especially to seawater, together with erosion and cavitation resistance.

Can it be supplied with graphite plugs?

Yes — the alloy is commonly used as the base material for self-lubricating slide bearings with graphite plugs for hydraulic and offshore applications.

CuZn34Mn3Al2Fe1 (CC764S) Manganese Brass Bearings for High-Load, Low-Speed Service

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

CuZn34Mn3Al2Fe1 (CC764S, EN 1982) is a high-strength manganese brass recommended for bearings under high loads and low speeds with good lubrication and hard contact surfaces.

Meta description: CC764S manganese brass bearing — chemical composition, mechanical properties, grade equivalents (C86200, SAE 430A), wear resistance and seawater performance.

Chemical Composition (%)

Mechanical Properties (Minimum Values)

Closest International Standards

Technical Characteristics

• Difficult machining properties (hard material; plan tooling accordingly).
• Good wear-resistant material.
• Recommended for high loads, low speeds, good lubrication and hard contact surfaces.
• Resistant to seawater.
• Resistant to atmospheric corrosion up to 300 °C.
• Low welding tendency on contact surfaces (low galling tendency under boundary conditions).

Optional heat treatment at customer request: stress relieve.

Typical Applications (Indicative)

• Heavy-duty bushes and bearings running at low sliding speeds with reliable lubrication
• Marine bearings exposed to seawater (propeller shaft bushes, rudder bearings)
• Wear components where a hard, wear-resistant bearing material is required
• High-strength cast components such as valve stems and pump parts

FAQ

What is CC764S used for?

High-load, low-speed bearing arrangements with good lubrication and hard contact surfaces, including seawater-exposed marine components.

Is CC764S the same as C86200?

CC764S (EN 1982) and C86200 (ASTM B505, SAE 430A) are closely equivalent high-strength manganese brass grades; verify the governing standard for the application.

Can it run dry?

The data sheet recommends good lubrication; for dry-running service select a graphite-plugged self-lubricating variant.

Self-Lubricating Graphite Bronze Slide Bearings for Heavy-Duty Equipment

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

Graphite-lubricated bronze and brass slide bearings operate without external oil or grease, using macro-distributed solid lubricant plugs to maintain a low-friction transfer film under heavy loads, dust and temperature fluctuations.

Meta description: Self-lubricating graphite bronze slide bearings for heavy-duty agriculture, mining and construction equipment — material options, lubrication mechanism and selection guidance.

Why Heavy-Duty Machines Use Self-Lubricating Slide Bearings

Agricultural, mining and construction machinery operate in dusty, hot and complex environments. Lubrication points are difficult to reach, and lubricant loss contaminates soil and water. Self-lubricating, maintenance-free material systems reduce or eliminate the release of oil and grease, and lower maintenance and disposal costs, while keeping the bearing functional in conditions where conventional lubrication is unreliable.

Graphite slide bearings are used across the heavy-duty sector in applications including agriculture, mining, construction sites, materials handling and transshipment cranes.

Lubrication Mechanism

The bearings are made from wear-resistant copper and brass alloys. Sliding surfaces are uniformly equipped with macro-distributed solid lubricant deposits (plugs). Two plug types are used:

• Graphite-based plugs — for high-temperature and dry-running service.
• PTFE-based plugs — for very low friction where temperature permits.

With graphite-lubricated bearings the material itself acts as the lubricant: from the first movements, solid lubricant is released through micro-abrasion and forms a firm, adherent film on the sliding partner. The lubricant stays in the contact zone even under high loads, keeps the sliding surfaces separated, and maintains a consistently low coefficient of friction with minimal wear. In technical dry operation, graphite-bearing slides carry a 10–20 µm running-in film that supports solid-lubricant transfer.

The high density of the bronze base material provides load-bearing capacity while dirt particles are embedded into the lubricant depots, which supports material longevity in dusty environments.

Material Options and Selection

Key Features of the Material System

• Load-bearing capacity from high-density bronze and brass bases.
• Solid lubricant retained in the contact zone even under high loads.
• Extensive separation of sliding surfaces — consistently low coefficient of friction.
• Minimized wear and dirt embedding in lubricant depots.
• No external lubrication circuit, no oil or grease discharge.

FAQ

Are graphite slide bearings truly maintenance-free?

In the functional sense yes — the graphite/PTFE solid lubricant replaces external oil and grease lubrication. Periodic inspection of wear and clearance is still recommended.

Can they run in dust and dirt?

Yes. The dense bronze base embeds dirt particles into the lubricant depots, which reduces abrasive wear of the sliding surface.

Which application is CuSn7ZnPb7 used for?

Hydroelectric turbines, hydraulic steelwork and environments involving seawater contact, where a leaded corrosion-resistant bronze with solid lubricants is required.

Nickel Aluminum Bronze (NAB) Bearings: Alloy Guide and Graphite-Plug Types

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

Nickel aluminum bronze (NAB) bearings combine the strength and seawater corrosion resistance of NAB alloys with, in graphite-plugged versions, maintenance-free self-lubricating operation.

Meta description: Nickel aluminum bronze bearing guide — NAB alloy composition and properties, graphite-plug self-lubricating mechanism, applications and selection considerations.

What Is Nickel Aluminum Bronze (NAB)?

Nickel aluminum bronze is a copper-based alloy strengthened by aluminum, nickel and iron. Combining aluminum and nickel with bronze gives a balance of strength, ductility, toughness and corrosion resistance that is well suited to aggressive environments such as seawater.

Properties of NAB Alloys

• High strength — comparable to low-alloy steels.
• High corrosion resistance, particularly in marine and industrial environments.
• Good wear resistance for heavy-load applications.
• Thermal stability — retains properties at elevated temperatures.
• Abrasion resistance in environments with abrasive media.
• Ductility and toughness without loss of strength.

Self-Lubricating Bearings Plugged with Graphite

Graphite plugs are solid lubricant inserts embedded in the bearing surface. As the shaft moves, minute amounts of graphite are transferred to the counter-surface and form a lubricating film. This eliminates external lubrication and its associated maintenance.

• Mechanism: graphite plug transfer film separates the sliding surfaces.
• Friction: reduced operating resistance between moving parts.
• Service life: minimized wear supports longer component life.
• Environment: no oil or grease discharge reduces contamination risk.
• Performance: stable operation across varying temperatures and loads.

Applications

Selection Considerations

• Cost: initial investment is higher than standard bearing materials.
• Design: the bearing must be engineered to match application requirements (load, speed, temperature, counter-surface).
• Installation: correct installation is required for rated performance.
• Environment: NAB handles harsh conditions well, but extreme environments can still affect longevity — verify limits with VIIPLUS.

FAQ

Why add nickel to aluminum bronze?

Nickel increases strength without reducing ductility or corrosion resistance, and improves toughness and resistance to stress corrosion.

Can NAB bearings run without lubrication?

Plain NAB bearings require lubrication; graphite-plugged NAB bearings operate maintenance-free in the self-lubricating sense.

Where are NAB bearings most commonly used?

Marine components (propeller shafts, rudder bearings), heavy machinery, industrial pumps and valves, and transportation systems.

Bronze Alloys for Marine Bearings: Self-Lubricating Graphite Solutions

VIIPLUS · Copper-Alloy Plain Bearings, Bushes & Self-Lubricating Slide Bearings

Marine bearings face corrosive saltwater, variable loads and limited maintenance access. Self-lubricating bronze alloy bearings with embedded graphite provide corrosion resistance, high load capacity and reduced maintenance in harsh marine conditions.

Meta description: Bronze alloys for marine bearings — copper-nickel, aluminum bronze, tin bronze and lead bronze; graphite self-lubricating bearings for propeller shafts, rudders and deck equipment.

Self-Lubricating Bronze Graphite Bearings

Graphite is a solid lubricant that performs at various temperatures and resists corrosion — qualities suited to marine applications. In bronze alloy bearings, graphite is embedded as plugs or distributed particles within the metal matrix, providing consistent lubrication throughout the bearing’s service life without regular oiling or greasing. The bronze base often contains tin, aluminum or nickel to enhance strength and corrosion resistance.

Benefits

• Corrosion resistance: bronze inherently resists saltwater corrosion; graphite keeps surfaces lubricated, reducing wear.
• Reduced maintenance: self-lubrication minimizes external lubrication, cutting maintenance time and cost in hard-to-reach marine locations.
• High load capacity: handles high static and dynamic loads for rudder bearings, propeller shaft bearings and similar.
• Environmental: no grease or oil discharge into the marine environment.
• Durability: reduced wear and resistance to harsh conditions support longer component life.

Bronze Alloy Groups for Marine Service

Typical Mechanical Properties of Marine Bronzes (Indicative)

Nickel aluminum bronze (NAB) proof strength ranges from 280 to 680 N/mm² and tensile strength from 600 to 850 N/mm² across conditions, making it a common choice for heavy marine loads.

Marine Applications

• Propeller shafts and rudders: high load and continuous movement with self-lubricating smooth operation.
• Deck equipment: winches, pulleys and deck machinery benefit from low maintenance and corrosion resistance.
• Stabilizers and steering gears: reliability with minimal maintenance for critical navigation components.
• Shaft bearings: copper-nickel and aluminum bronze for robustness in saltwater.
• Propeller bushings: aluminum bronze for corrosion resistance and strength.
• Deck fittings and valve components: tin bronze for a balance of corrosion resistance and physical strength.

Manufacturing and Handling

Bronze alloys can be manufactured by extrusion, forging, rolling, drawing, hot stamping and cold forming, and by casting methods including sand casting, mold casting, continuous and centrifugal casting. Manufacturing method affects material properties and suitability for specific marine applications. Regular inspection and cleaning help prevent biofouling and maintain bearing surface integrity.

FAQ

Which bronze is used for propeller shaft bearings?

Nickel aluminum bronze (NAB, e.g. CC333G / C95800) and aluminum bronze are preferred for their strength and seawater corrosion resistance.

Do marine bronze bearings need grease?

Plain bronze bearings require lubrication; graphite-plugged self-lubricating versions operate without external oil or grease, which also avoids discharge into the marine environment.

What is the difference between aluminum bronze and tin bronze for marine use?

Aluminum bronze offers higher strength and erosion resistance (propellers, underwater fastenings); tin bronze provides good seawater corrosion resistance for bushings and bearings.