Project Description

Graphite Plugged Bronze Bushing

Graphite plugged bushing is one of the self-lubricating bearings, that can replace the traditional oil lubrication, commonly used in the harsh working environment or can not use on oil lubrication occasions.

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What Is Graphite Plugged Bushing?

Graphite plugged bushing is in the metal substrate by a certain arrangement of pre-processed holes or grooves, the graphite embedded in it, in the process of friction the metal substrate bears the majority of the load; due to friction heat or the role of the ambient temperature, graphite material in the sliding surface slightly convex, in the metal substrate and the counterpart surface to form a well-lubricated, firmly attached and uniformly covered solid transfer film. Significantly reduce the friction wear; with the entry of friction, the embedded solid lubricating material is constantly provided on the friction surface to ensure long-term operation of the friction vice good lubrication.

Currently, the commonly used substrate materials are ZQSn6-6-3, HT250, Cr15, and CuZn25Al6Mn4, etc., which can meet the performance requirements under different working conditions. Metal matrix available solid material casting molding or powder metallurgy formation method.
Solid lubrication material embedding solid embedding, direct injection, casting method, etc. Can be selected according to the different working environments.

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Application Of Graphite Plugged Bushing Bearings

Graphite plugged bronze bushings are especially suitable for oil-free, high temperature, high load, low speed, anti-fouling, anti-corrosion, anti-radiation, as well as in water or vacuum solution wetting and simply can not add lubricating oil film under special working conditions.

graphite bronze bushing is widely used in metallurgical rolling equipment, filling equipment, water turbines, gas turbines, instruments and mining machinery, marine machinery, textile machinery, shipbuilding industry, aerospace navigation, etc. At the same time, Graphite plugged bushings are also more and more widely used in other industrial and agricultural machinery.

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hardened steel bushing

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self lubricating bushes, graphite plugged bronze bushings

Why Use Graphite As A Solid Lubricant?

Graphite is a crystalline form of carbon, with hexagonal lattice, the atoms are arranged in layers, the distance between carbon atoms in the same layer is 0.142nm, which are covalently bonded to each other; the distance between layers is 0.34nm, which are molecularly bonded to each other. The layer-to-layer force is very small, so it is easy for relative sliding to occur between the layers. Because of these structural characteristics, its strength and hardness are very low, and its plasticity is also very poor, but it can play a good role in reducing wear, and is a good solid lubricant.
Graphite is often used as a lubricant in the machinery industry. Lubricating oil often can not be used in high speed, high temperature, high pressure conditions, while graphite wear-resistant materials can be in a 200 ℃ a 2000 ℃ temperature and at a very high sliding speed (loom / S) without lubricant work.

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The Material Of Graphite Plugged Bushings

There are different types of bronze materials used in the manufacture of graphite plugged bushings, including :

SAE 841 Bronze: SAE 841 is a powdered metal bronze material that is often used to make self-lubricating bearings and bushings. It is a porous material that is impregnated with oil, which provides excellent lubrication and reduces friction.

C86300 Manganese Bronze: C86300 is a high-strength manganese bronze material that is often used in heavy-duty applications where high load capacity and wear resistance are required.

C93200 Bronze: C93200 is a high-strength bearing bronze material that is often used in applications where high wear resistance is required. It has excellent machining properties and can be easily machined into complex shapes.

C95400 Aluminum Bronze: C95400 is a high-strength aluminum bronze material that is often used in applications where high strength and corrosion resistance are required. It is commonly used in marine applications due to its excellent resistance to saltwater corrosion.

The choice of bronze material depends on the specific application requirements such as load capacity, speed, temperature, and environment. It is important to select the appropriate bronze material to ensure optimal performance and long service life.

graphite plugged bronze bushings wear plates, C83600 bearing bronze wear plate

graphite plugged bronze bushings

Metallurgical machinery and equipment in harsh working conditions Graphite Plugged bronze bushing, need to have: (1) excellent wear resistance to adapt to metallurgical machinery and equipment periodic overhaul bearing service capacity; (2) high strength to adapt to the heavy load and impact resistance of metallurgical machinery and equipment bearings; (3) adequate lubrication function to adapt to high temperature, dusty, corrosive media and continuous operation of harsh working conditions; (4) wide temperature fluctuation range to adapt to the continuous operation of metallurgical machinery and equipment wider temperature environment.

slide bearing plate with graphite

These bearings are easy to start, have low friction, are easy to maintain, and have a wide temperature range. Bearing in motion due to the thermal effect and friction, so that solid lubricating materials continue to seepage transfer, while the substrate wear, solid lubricating materials are gradually exposed, so inlaid into the composite solid lubricating materials have their own transfer and repair capacity, and thus long service life.

Bronze Base Material

ZCuSn10Pb1: corrosion resistant, especially to dilute sulfuric acid, hydrochloric acid, and fatty acids. Structural material, corrosion-resistant, acid-resistant fittings as well as crusher bushings, and shaft tiles.
ZCuSn10Pb5: lubricating function, good function and corrosion resistance, suitable for use as the bimetallic casting material. Bearings for vehicles, bimetallic shaft tiles for internal combustion engines with peak loads up to 100Mpa, as well as piston pin bushings, friction plates, etc.
ZCuPb10Sn10: high hardness, good performance, not easy to seize the appearance, good casting and cutting function, excellent corrosion resistance in the atmosphere, and fresh water. Can be used for high load (below 20Mpa) and high sliding speed (8m/s) under the operation of parts, such as connecting rods, bushings, shaft tiles, gears, worm gears, etc.
ZCuPb15Sn8: In the absence of lubricant and water lubricant conditions, graphite bushings’ sliding and self-lubricating functions are good, easy to cut, casting function is poor, and corrosion resistance to dilute sulfuric acid function is good. High external pressure and side pressure bearings, can be used to make copper cooling tubes for cold rolling mills, impact load resistant parts up to 50Mpa, bimetallic shaft tiles for internal combustion engines, piston pin bushings used primarily for larger loads up to 70Mpa, acid resistant accessories.

oilless thrust washer

Metallurgical equipment is in long-term high temperature, heavy load, impacted impact, dust, iron powder and water, lubricating oil and grease often fail. lubricating oil and grease often fail. But graphite plugged bronze bushing play a particularly good The performance of inlay bearings is particularly good. Since no oil is used, a series of auxiliary equipment for the oil pump tank is eliminated.
Since no oil is used, a series of auxiliary equipment for the oil pump tank is eliminated, which saves energy and reduces investment.


One of the main advantages of graphite-plugged bronze bushings is their self-lubricating property. The graphite plugs within the bushing continuously release lubricant, eliminating the need for external lubrication and reducing maintenance requirements.

Low Friction

The presence of graphite plugs ensures low friction between the bushing and the moving parts, improving the overall efficiency of the machinery and reducing energy consumption.

High Load Capacity

The combination of bronze and graphite provides a high load-carrying capacity, allowing these bushings to support heavy loads and operate under harsh conditions.

Corrosion Resistance

Bronze alloys exhibit excellent corrosion resistance, making them suitable for applications in harsh environments or where exposure to corrosive agents is a concern.

Long Service Life

The self-lubricating and wear-resistant properties of graphite-plugged bronze bushings contribute to their extended service life, reducing the frequency of replacement and associated downtime.

Plug Graphite Bearing – Factory Price

Graphite plugged bushings are an excellent option for applications where low maintenance, extended service life, and high load-carrying capacity are required. They offer excellent resistance to wear, corrosion, and chemical attack, and can operate in a wide range of temperatures. If you are looking for a reliable, low-maintenance bearing solution for your equipment, Send email to us.