Large straight bronze graphite plugged bushings with extra hardness are mechanical components designed for heavy-duty applications requiring durability and low friction. These bushings are typically made from a bronze alloy, which offers excellent strength and wear resistance. The inner lining is impregnated with graphite, a natural lubricant that significantly reduces friction between the bushing and the mating shaft or rod.
The "inch size" refers to the dimensions of the bushing being measured in inches, rather than metric units. The "large" designation generally indicates that the bushings have a relatively large outer diameter, making them suitable for applications with larger shafts or requiring higher load-bearing capacity.
The "extra hardness" feature of these bushings is achieved through special heat treatment or alloy composition, which provides enhanced wear resistance and durability. This is particularly useful in applications involving high loads, high speeds, or both, where traditional bushings may experience premature wear or failure.
Straight bushings refer to the configuration of the bushing, where the bore is straight through the entire length of the component. This allows for smooth and continuous movement of the shaft or rod along the entire length of the bushing.
When selecting inch size large straight bronze graphite plugged bushings with extra hardness, it is important to consult with the manufacturer or supplier to ensure that the dimensions, material specifications, and hardness level are compatible with your specific application requirements. This will help ensure optimal performance and durability of the bushings in your system.

Straight Bushings Extra hard large size Graphite Plugged Bronze Bushings & Bearings | Self-Lubricating Bearings CHINA technology

Graphite Plugged Bronze Bushings are all self-lubricating and maintenance free. These bushings are machined out of continuous cast bronze and plugged with solid lubricant plugs. A bushing and it's mating surface should always be seperated by a film of lubricant. With Graphite Plugged Bronze Bushings no form of supplementary lubrication is required.
We provide all kinds of self-lubricating slippers, guide sleeve, wedge, and other products for packaging machinery, power transmission, mold, injection mold, stamping mold, and other application fields.
Oil Free Bushings -Copper Alloy Straight Standard: Thin Wall I.D.F7 O.D.m6 Type

Graphite Plugged Bronze Bushings / Bearings made in china

Graphite Plugged Bushings are a complete line of Self-Lubricating Bushings that excel whenever standard lubrication is impractical, including heavy load, high-temperature applications.
They are manufactured from a variety of Bronze Alloys, including C86300 Manganese Bronze, C95400 Aluminum Bronze, and C93200 Bearing Bronze.

VIIPLUS has been developed for high load, low speed cast high-strength bronze using a specially formed graphite plug as a lubricant. Our oilless bearings are graphite loaded and can withstand temperatures of up to 400°C ...

The self-lubricating bearings & oil-bearing drilling fluid is worth wide application in drilling medium-radius horizontal wells in the area.
The drilling rig for oil drilling is a set of combined units. The drilling rig is composed of the winch, traveling car, hook, turntable, drilling pump, power unit, linkage unit, complete drilling equipment, and auxiliary equipment such as well control, solid control equipment, generator set, hydraulic and aerodynamic.​

Graphite Plugged Sleeve Bushing is a material suitable for heavy loads at low sliding speed, the solid lubricant is provided by Graphite with additive, which is inserted into the bronze structure of the bearings.
The base material is CuZn25Al5.

The available items in this material are the cylindrical and flanged bush, washers, strips, and special parts on customer requests.

Self Lubricating Graphite Plugged Bronze Sleeve Bushing
Plug Graphite Sleeve Bushing

Driller & punching machine drilling grinding machine bushings
Self Lubricated for Higher Temperatures and Heavier Loads

Solid self-lubricating bearing with graphite plug insert | Graphite copper sleeve bushings

Inch Sized Bushings

Metric Sized Bushings

Material

Bronze CuZn25Al5 with/without graphite
Bronze sleeve bearings flanged bronze bushings for sale

Applications

The future will be widely used in self-lubricating bearings & bronze bushings oil and gas drilling tools and equipment, and the use of energy or tidal stream turbine power generation equipment which.

Performance

Graphite Plugged Cast Bronze Bushings can be utilized where heavy loads must be supported at low to medium speeds

The Plug Graphite Cast Bronze Bushing is able to withstand high temperatures up to 570 F
The self-lubricating feature allows bearings to be used where oiling is difficult, expensive to implement, and where grease/oil cannot be used. Excellent lubrication is achieved even under high loads at low speeds.
Self-lubrication with specially embedded solid lubricants reduces friction. Coefficient of Friction: 0.04 to 0.2

Beyond Grease: A Deep Dive into Oilless Bushings & Why Viiplus Leads the Way

Friction is the enemy of efficiency. In countless machines, from massive industrial equipment to intricate automotive components, the constant battle against wear and tear dictates performance, longevity, and maintenance costs. Traditionally, grease and oil have been the go-to solutions, but they come with their own set of challenges: frequent re-lubrication, potential contamination, environmental concerns, and limitations in extreme conditions.

Enter the world of oilless bushings, also known as self-lubricating bearings or sliding bearings. These innovative components offer a smarter way to manage friction, delivering reliable movement without the need for external lubrication.

At Viiplus (www.viiplus.com), we don't just supply these components; we engineer solutions. Leveraging deep expertise in metallurgy and tribology (the science of friction, wear, and lubrication), we've become a leading name in sliding bearing technology. But what exactly are oilless bushings, and why should they be on your radar? Let's dive deeper.

What Exactly Are Oilless Bushings? The Science of Self-Lubrication

Unlike traditional ball or roller bearings that rely on rolling elements and require constant lubrication films, oilless bushings operate on the principle of sliding motion. Their "magic" lies in their material composition and structure, designed to provide their own lubrication at the bearing surface. This can be achieved through several key technologies:

1. Solid Lubricants Embedded: Materials like graphite, MoS₂, or PTFE are embedded directly into the metallic matrix (often bronze) of the bushing. As the shaft rotates or slides, a minuscule amount of this solid lubricant is transferred to the mating surface, creating a low-friction film.

2. Porous Metal Structures: Sintered bronze or iron materials are created with microscopic pores. These pores are vacuum-impregnated with oil during manufacturing. In operation, slight heating causes the oil to expand and seep onto the bearing surface, providing lubrication. When it cools, the capillary action draws the oil back in, creating a closed-loop system.

3. Layered Composites: These often feature a strong backing (like steel), an intermediate sintered layer (like bronze), and a low-friction overlay (often PTFE-based). The PTFE layer provides the primary sliding surface, offering extremely low friction.

Contrasting Logic: Oilless vs. Traditionally Lubricated Bearings

The Tangible Benefits: Why Make the Switch?

Choosing oilless bushings isn't just about eliminating grease guns. It's about unlocking significant operational advantages:

• Drastically Reduced Maintenance: This is the most obvious benefit. No re-greasing means less labor, less scheduled downtime, and simplified maintenance protocols. Imagine the savings across a factory floor!

• Enhanced Reliability: Lubricant starvation is a major cause of bearing failure. Self-lubricating bearings ensure consistent lubrication, leading to predictable performance and longer service life, especially in hard-to-reach locations.

• Superior Performance in Harsh Conditions: Oilless bushings excel where traditional lubricants fail:

  • High Temperatures: Certain types can operate at temperatures far exceeding the limits of conventional greases.

  • Low Temperatures: No grease means no stiffening or freezing issues.

  • Contaminated Environments: The absence of sticky grease reduces the ingress of dirt, dust, and debris.

  • Vacuum or Underwater: Ideal for applications where liquid lubricants are impractical or impossible.

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• Cost Savings (Total Cost of Ownership): While the initial purchase price might sometimes be higher, the TCO is often significantly lower due to savings on lubricants, labor, downtime, and potential component failure replacement.

• Environmental Friendliness: Eliminating oil and grease leakage prevents contamination of products, machinery, and the environment. Crucial for industries like food processing, pharmaceuticals, and textiles.

• Compact & Simplified Designs: Without the need for lubrication systems (nipples, lines, reservoirs), machine designs can be more compact and streamlined.

Exploring Viiplus's Portfolio: Finding Your Solution

Viiplus offers a comprehensive range of self-lubricating bearings designed to meet diverse application needs. Understanding the different series helps in selection:

• JDB Series (Graphite Plugged Bronze): Excellent for high-load, low-speed applications, intermittent motion, and high temperatures. The graphite plugs provide continuous solid lubrication. Ideal for heavy machinery, molds, and hydraulic components.

• SF Series (PTFE-Based Composite): Typically metal-backed (SF-1: steel, SF-2: steel/bronze) with a PTFE-based lining. Offers very low friction, good wear resistance, and suitability for dry running or marginal lubrication. Common in automotive, office equipment, and hydraulics.

• JF Series (Bimetal Bushings): Combines a steel backing with a sintered bronze or lead-bronze lining. Good load capacity and fatigue strength. Often used with grease or oil but can operate marginally lubricated. Found in engines, chassis parts, and agricultural machinery.

• FB Series (Wrapped Bronze): Often made from bronze strip, sometimes with lubrication pockets or through-holes. A cost-effective solution for medium loads and speeds, typically requiring initial greasing but offering extended re-lubrication intervals.

Quick Comparison Chart (General Guide):

(Note: This is a simplified guide. Always consult specific product data sheets or Viiplus experts for precise application requirements.)

Uncertain which material or type suits your project? Our Bushing Material Selection Guide is designed to help, or Contact Us for a Free Quote and Expert Advice.

Why Partner with Viiplus? Expertise Meets Quality

Choosing the right supplier is as critical as choosing the right bushing. Here’s why companies worldwide trust Viiplus:

• Deep Expertise: Our foundation in metallurgy and tribology, coupled with a talented R&D team, means we understand the science behind reliable movement. We don't just sell; we solve friction challenges.

• Uncompromising Quality: We employ advanced manufacturing techniques (including sand casting, centrifugal casting, metal casting, investment casting) and a rigorous quality management system, ensuring every bushing meets the highest standards.

• Comprehensive Range: From standard metric sizes in JDB, SF, JF, and FB series to custom solutions including cylindrical, flange, double flange bushings, wear plates, and guide rails – we have the portfolio to match your needs.

• Global Reach, Seamless Logistics: Based in China, we ship sliding bearings worldwide. Our professional team handles customs clearance efficiently, ensuring smooth, timely delivery with all necessary documentation.

• Customer-Centric Approach: We believe in ethical practices and building trust. We offer flexible production (single units to large series), competitive pricing, and  online support.