Project Description

Trusted Oilless Bearings services

Trusted & reliable Bronze Oilless Parts services

Trusted handyman services

A manufacturing consultant and engineer, supplies a broad range of standard bronze oilless parts and self-lubricating bushing, wear plates for for dry applications

Making Small Parts. Making A Big Difference

We can produce virtually any bushing, bearing, or related part to your specification. If you don’t have a drawing, we will work with you to reproduce your part from a sample. We are specialists in cutting lubrication grooves in virtually any pattern. 

Bronze Bushing With Groove
guide bushes

Special Dimension Bearings And Custom Bearings

We offer a broad range of bearing types, from sleeve and flange to plate and thrust, solid and cast bronze bearing. Our bearings can be oil-impregnated, dry, or graphite-filled to meet a broad range of application requirements.

Viiplus can also supply special dimension bearings and custom bearings of all types including those with integral shafts that help reduce the tolerance buildup of mating components. Our engineers have designed custom bearings in a variety of configurations, special geometry, advanced lubrication, and high-tech materials.

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Need Assistance Selecting The Proper Custom Bushings?

There is a growing demand for custom bearings with non-standard specifications. VIIPLUS always works with its customer to find a solution. We can supply plain bearings in a wide variety of materials, sizes, tolerances, and designs.

We offer a broad range of bronze alloy materials beyond our core powdered metal (SAE 841) and cast bronze (CA932 / SAE 660) products. A few of the other bronze alloys offered include high leaded tin bronze (CA 936 and 937), aluminum bronze (CA 614, 630, and 954), and manganese bronze (CA 863).

Our processes include boring (minimum .0937″) to turning (maximum 75″) to finished machined lengths up to 50″. We also provide milling, drilling, tapping, reaming, and centerless grinding, as well as special oils and dry and re-lubrication services.

If you need help in selecting the best products for your particular application, please remember that design engineering and application assistance are available from Viiplus as part of our value-added services designed to make your job easier.

Get a free quote now!
flange graphite plugged bronze bushing
graphite plugged bronzew bushing

Design of non-standard bearings

When the demand for multi-custom bearings is put forward, there is a lack of careful analysis, resulting in problems such as poor bearing performance, many failures, and short service life. To avoid similar situations, refer to the following four-step requirement process:

Two basic performance requirements determine the role that bearings play in practical applications. Therefore, the proposal of bearing requirements must include: providing rotational degrees of freedom within the specified range. Provides position control within a specified range (from basic free motion to high-frequency motion or vibration). Determining the actual limits of these requirements is important because bearing life is a statistical prediction within these limits.

Many application parameters determine product performance. Although only a few parameters may be important in a particular application, careful analysis of all parameters is necessary to ensure that no important parameters are missed.
Performance application parameters can be divided into the following 4 categories:
1. Physical parameters. Including the available space of the bearing or bearing system, The bearing or bearing system can bear the load, the shape, material, dimension, and tolerance control of the shaft and housing is integrated into the bearing to simplify the installation structure
2. The higher the working temperature, the greater the available space and the bearing load of the bearing system, and the higher the precision and reliability. However, the cost of adding additional bearing loads is high, so there is no need to add them unless necessary. The design of the shaft and housing has a large impact on the final bearing performance. The shaft should be a solid cylinder and the material used should be fully compatible with the thermal expansion coefficient of the bearing. The cross-section of the housing should be uniform to provide full circumferential support for the bearing. To ensure precise alignment, the shaft and housing should also feature precision machined shoulders or races.
3. Operating parameters. include:
3.1 Speed ​​determines the number of load cycles that the bearing can withstand, and thus affects the service life of the bearing. Speed ​​is usually expressed in terms of the relevant guide parameter “dN”, which also affects other aspects of bearing operation, including oil flow profile, oil film thickness, centrifugal load on rolling elements, displacement, overheating, and lubrication method.
3.2 Load can be decomposed into three directions radial, axial, and bending moment and the loads in these three directions will correspondingly generate constant load, alternating load, vibration load, or shock load. The combined effects of these loads should be carefully considered to ensure maximum bearing life and optimum performance.
3.3. Environmental parameters, the environment is a fixed factor for the final product, but whether the bearing is to be protected or exposed to a certain environment is an optional design factor. Either ambient temperature or internally generated temperature should be considered as the main consideration. The nature of the surrounding medium (liquid or gas) may place certain requirements on tightness, special anti-corrosion treatments, or relubrication. In addition, any special environment (such as a magnetic field or radiation environment) is also a necessary factor that should be considered in the design.
3.4. In Economic parameters, the total system cost should be carefully weighed, not only the bearing cost but also the total cost of bearing installation and replacement should be considered.
Many parameters are fixed in a specific application, but some are variable and can be modified or controlled if necessary. The designer makes the final choice after weighing these parameters.

If the performance is so significantly reduced that the bearing no longer meets the original requirements, the design life of the bearing in a particular application will be reduced. There are 15 common injury modes:
foreign object wear
Etching Assistant
Insufficient lubrication
Fatigue peeling
Transitional preload or overload
The shaft end clearance is too large
Inaccurate and misaligned seat washer and shoulder
Damage during transportation and installation
Damage to bearing cage or fixings
Raised locations and damage during assembly
Improper mounting of housing or shaft
Brinell indentation damage and impact damage
False Brinell indentation
electrical burn
to calculate the service life. Other factors are empirical factors related to a particular application, such as temperature, lubrication, overloa,ding or contamination, which may reduce service life.

The above factors must be carefully considered before selecting a specific bearing. For more demanding application fields, specific design schemes or control methods can be formulated according to the following contents:
Lubrication type, method, cycle
Use of dust caps or seals
Cage configuration, material, and clearance
Basic tolerances and corrections
Radial clearance or contact angle
material change
Geometry Correction for Contact Areas
Special balls or ball accessories
Complete special design

Request A Custom-Bearing Prototype!

  • Custom-made products – Price and delivery time on request

  • Beside to the big variety of standard products, we offer custom-made rotation- and milled-parts.

  • Get standard products with modifications.

  • Maintenance and lubrication.

Contact Us For A Free Quote
  • Custom Parts – The Online Manufacturer. Bronze oilless flat plates have to be drilled from the backside and countersink on the sliding surface if it´s necessary to drill through a solid-lubricant depot.
  • Providing custom-designed components including cutting, bending, punching, turning, etc. All your custom parts from one source at – The Online Manufacturer. Oilless Bronze Parts Custom Engineering, focused on improving quality parts. Worldwide express shipping, short delivery times, and constantly free capacities. Large material selection. Free quote. Quick offers.
  • We supply high volume international Original Equipment Manufacturers (OEMs) with our customized capabilities.
  • We have worked with these popular materials (other materials available upon request).

    C36000 Free Cutting Brass
    C63000 Nickel-Aluminum Bronze
    C67300 Silicon-Manganese Brass
    C86300 Manganese Bronze
    C92700 Tin Bronze
    C93200 Tin Bronze
    C95400 Aluminum Bronze

We Have Extensive Expertise In Grooving And Offer A Full Range Of Groove Styles

From simple straight and circular grooves to double loops and double-figure eights. Plain or graphite-filled grooves are available in a minimum I.D. of .190″ and a minimum length of .09375″.

Please contact us to learn more about how our bearings can benefit your business.

Precision CNC
High Quality
Factory Price
Fast Delivery
Groove Circular


Groove Straight


Groove Style1 Single Loop

Team training

Groove Style2 Dble Loop

Double Loop

Groove Style3 Strght Single

Straight & Circular

Groove Style4 Fig Eight

Figure 8

Groove Style5 Dble Fig Eight

Double Figure 8

Groove Style11 Half Fig Eight

Style 11

Graphite Loop


Graphite Multi Loop 3to4

Multiple Loop

Graphite Multi Circular

Multiple Circular

Graphite Multi Loop 7to8

Multiple Loop

Custom Bronze Bushing

Custom Bushing Manufacturers – High Degree Of Automation

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Custom-made Bearings – Advanced Precision Machining

We can carry OEM production, either bearing or its components. Viiplus is a supplier of custom bearings with full technical services to support the most extreme environments. Whether it is modifying a standard product or a completely bespoke proposal, Viiplus can rely on decades of proven solutions with access to cutting-edge technology.

VIIPLUS manufactures a variety of bronze bearings, bushings, washers, wear plates, and other parts from a wide range of copper-based alloy castings and extrusions. Our machined bronze parts are used in:

Truck and automotive aftermarket parts, Pumps and compressors, Hydraulic cylinders, Agricultural, and construction equipment, Injecting molding machines, Winches, and hoists, Industrial equipment, and Valves

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slide guide v shaped type
graphite slide plate

Standard Bushing VS custom bearings

Custom bearings let engineers design and use components tailor-made for their specific applications. Such bearings can have longer working lives or better resist corrosion, thanks to bearing material chosen to resist contaminants in an application’s working environment. This reduces replacement and maintenance costs. Custom bearings can be produced with greater load ratings than ‘standard’ selections. They can also be made smaller or lighter to make installation easier. And from a market perspective, they can capture the aftermarket replacement business for the OEM.

We are specialists in cutting lubrication grooves in virtually any pattern.

Common groove patterns available are figure eight, double figure eight, loop, double loop, circular, wick, or straight. Any of these grooves can be contained within the length of the part of breaking out the ends. Call us for assistance in determining which pattern is most appropriate for your application. Additional capabilities include milling, drilling, grinding, honing, broaching, and de-burring.

Send us a drawing or sample. Generally, we’ll have a price back to you within 24 hours.

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Casting Method Of Copper Bushing

1. Sand casting

It has the advantages of wide adaptability and relatively simple production preparation. However, the dimensional accuracy, surface quality, and internal quality of castings produced by this method are far from meeting the requirements of mechanical parts, and the production process is more complicated, and the realization of mechanized and automated production requires huge investment. In the production of some special parts and special technical requirements When casting, the technical and economic indicators are low, therefore, the application of sand casting in foundry production
subject to certain restrictions.

2. Special casting

Extrusion and liquid stamping casting. It is a comprehensive processing method of casting and forging.
Metal mold casting. It is a method of using a metal mold to increase the cooling rate of the casting, achieve one-type multi-casting, and obtain a casting with a dense crystalline structure.
Continuous casting. It is an efficient production method for casting tubes and ingots under the conditions of continuous casting, solidification and cooling through a rapid cooling mold.
Centrifugal cast copper sleeve. It is a method of casting special castings such as rings, tubes, cylinders, and sleeves by changing the filling mold and solidification conditions of liquid alloys and using centrifugal force.
Investment casting. It is a method of casting no-cut or less-cut castings with higher dimensional accuracy and lower surface roughness values using fusible models and high-performance shells (molds).
Die casting. It is a method of obtaining precision castings by changing the filling and crystallization and solidification conditions of the liquid alloy, so that the liquid alloy fills the mold under high pressure and high speed, and is formed and crystallized under high pressure.
Lost foam casting. It is to bond and combines foamed plastic models similar in size and shape to castings into a model family. After brushing a refractory coating and drying, it is buried in quartz sand for vibration modeling, and then liquid metal is poured under certain conditions to vaporize the model. The method of making the molten metal occupy the position of the model, and forming the required casting after the molten metal solidifies and cools.

casting bronze bushes

Choose your Application

China Custom Bushing, Bronze Oilless Bearings for off-highway equipment. No Need for Complex Greasing System.

Finishing Parts Main Base Alloy

& Chemical Compositions
High Brass
Special Brass
Tin Bronze
aluminium bronze
Tin bronze
Cast Iron HT250
Cu% 65 65 85 80 88
Sn% 5 12
Pb% 5
Zn% 25 25 5
Ni% 5
Al% 6 6 10
Fe% 5
Mn% 4 4
g/cm 3
8.0 8.0 8.8 8.3 8.8 7.3
Hardness >210 >180 >70 >150 >80 >160
Tensile Strength >750 >550 >200 >500 >360 >250
Elongation >12 >12 15 >10 >8
Coeicient of
linear expansion
1.9·10 -5 /℃ 1.9·10 -5 /℃ 1.8·10 -5 /℃ 1.6·10 -5 /℃ 1.8·10 -5 /℃ 1.0·10 -5 /℃
Limit Temp. 300~400 300~400 400 400 400 400
Max. Load N/mm 2 100 80 60 50 70 10
Max. Speed m/min 15 15 10 20 10 15
Max. PV N/mm2·m/min 200 200 200 200 200 40
400N/mm2 <0.01 <0.01 <0.05 <0.04 <0.05 <0.015

Friction of coe. Oil 0.03; Dry 0.16

Alloy International Code

Custom Size Options, machining bronze bushings and a supplier of solid bronze oilless bushes and plate delivered on time and on budget.

Oilless Bushing Alloy International Code

Chinese Code
International counterparts Applications
ISO 1338
CuZn25AI6FeMn3 CuZn25AI6FeMn3 H5102
High-load, low speed, general use
CuZn25AI6FeMn3 CuZn25AI6FeMn3 H3102
Super high load, low-speed, high
CuAI10Fe3 CuAI10Fe3 H5114
Medium load, medium-speed,
general use
CuSn5Pb5Zn5 QSn5-5-5 H5111
Medium load, medium-speed
Fe250 ASTM
low-load, low-speed

Material That You Can Choose

  • SAE 841
  • SAE 850
  • SAE 863
  • CA 220
  • CA 954 H.T.
  • CA 836
  • CA 932 (SAE 660)
  • CA 955 (and H.T.)
  • CA 863
  • CA 936 (Modified SAE 64)
  • CA 613
  • CA 903
  • CA 937 (SAE 64)
  • CA 614
  • CA 905
  • CA 464
  • CA 624
  • CA 907
  • CA 510
  • CA 630
  • CA 927
  • CA 544
  • CA 655
  • CA 954

Solid Lubricant

Solid Lubricant Features Typical application
SSL1(PTFE etc + Add) Excellent resistance against chemical attacks
and low friction. Temp limit 400℃
Suite for general machines and under
SL2(PTFE etc + Add2) Lowest in friction and good of water
lubrication,Temp.limit 300℃
Ship, hydraulic turbine, gas turbine etc.