Oilless Bearing

Oilless Flanged Bushing

Oilless Flanged Bushing

Self-lubricating bronze bearings are engineered for applications where external lubrication is impractical. Solid lubricants are compressed and molded directly into the bearing to guarantee a maintenance-free product. No additional lubrication is necessary.

Oilless Flanged Bushings (Graphite-Plugged Bronze)

Oilless flanged bushings run without external lubrication. Graphite plugs pressed into the bronze body leave a thin solid-film layer on the sliding surface, which renews itself over the whole service life. This page collects the material compositions and size ranges. For choosing between dry-running technologies, use the self-lubricated flanged bushing selection guide.

How the Oilless Design Works

The bronze or brass body carries the load; the graphite plugs (arranged typically at 30 to 45 degrees to the sliding direction) cover 25 to 35 percent of the bearing surface. During the first rotations, graphite transfers onto the counter-surface, after which the pair runs on a solid film with a low, stable friction coefficient.

Because there is no oil to age, wash away or contaminate the product, these bushings suit food-adjacent machinery, hard-to-access positions and high temperature zones where grease would dry out.

Oilless flanged bushing, flanged gunmetal bronze, lubrication-free

+SL2 Material Compositions

The +SL2 suffix marks graphite-plugged variants of our standard bronze and brass alloys. The table lists the chemical composition of each base material.

Table 1 — Chemical composition of +SL2 graphite-plugged materials
Bronze material CuZn25Al6Fe3Mn3 +SL2 CuSn5Pb5Zn5 +SL2 CuAl10Fe5Ni5 +SL2 CuSn12 +SL2
Cu% Rest 85 80 88
Sn% — 5 — 12
Pb% — 5 — —
Zn% 25 5 — —
Al% 6 — 10 —
Ni% — — 5 —
Fe% 3 — 5 —
Mn% 3 — — —
Density 8.2 g/cm3 8.8 g/cm3 8.5 g/cm3 8.8 g/cm3
Hardness >HB210 >HB70 >HB150 >HB80
Max. Load Pressure 100 N/mm 2 40 N/mm 2 50 N/mm 2 45 N/mm 2
Max. Linear Speed 0.5 m/s(dry) 0.4 m/s(dry) 0.25 m/s(dry) 0.5 m/s(dry)
Max. PV 1.65 N/mm 2 * m/s 1.00 N/mm 2 * m/s 1.25 N/mm 2 * m/s 1.20 N/mm 2 * m/s
Tensile Strength >750 N/mm 2 >200 N/mm 2 >500 N/mm 2 >360 N/mm 2
Elongation >12 % >15 % >10 % >8 %
Temperature Limit -40 ~ +300 o C -40 ~ +250 o C -40 ~ +400 o C -40 ~ +300 o C

Solid Lubricant Options

Besides standard graphite, other solid lubricant inserts are available for chemical, high-load or high-temperature service.

Oil-free flange bushing, bronze with solid lubricant inserts
Table 2 — Solid lubricant codes and applications
Code Material Features Application
SL2 Graphite composite Low friction Chemical resistant Low cost Temperature limit 400 o C Widely used for machinery
SL4 PTFE+MoS2 composite water Water contacting lubricating Longer life Temperature limit 300 o C (Sea) Water lubricating

Standard Size Ranges

Standard bores, ODs and flange diameters cover the common metric range; other sizes are machined to drawing.

Center-cut flanged oilless bearing, graphite-plugged bronze
Table 3 — Standard d1 / d2 / flange size ranges
d₁ 25 30 40 50 60 65 65 80 80 100 100
d₂ 35 40 55 65 75 80 80 100 100 120 120
d3 45 50 65 75 85 90 90 110 110 130 130
r 10 20 20 20 20 20 20 20 20 20 20
r1 1 1 2 2 2 2 2 2 2 2 2
r2 2 2 2 2 2 2 2 2 2 3 3
l3 7 10 10 10 10 10 10 10 10 10 10
l2 33 40 60 70 70 70 110 90 130 90 130
l1 40 50 70 80 80 80 120 100 140 100 140

When to Choose Oilless over Greased

Choose oilless when relubrication is impractical, when lubricant could contaminate the process, or at temperatures above the grease limit. Stay with a greased bronze bushing when speeds are high, loads are light, and a reliable lubrication circuit already exists.

See also the flanged bronze bushings overview for the full size tables, and the graphite-plugged half bushing page for split variants.

Bronze bushing with counter-sunk holes for graphite inserts

Oilless flanged bushings are versatile components used in a wide range of industries, including:

  • Automotive Industry

In the automotive sector, oilless flanged bushings are employed in suspension systems, steering columns, and gearboxes, enhancing vehicle performance and safety.

  • Aerospace Industry

The aerospace industry relies on oilless flanged bushings for their lightweight and high-performance characteristics. They are used in aircraft landing gear, control systems, and engine components.

  • Manufacturing Sector

Manufacturing machinery, such as conveyor belts, injection molding machines, and robotics, benefit from the precision and reliability of oilless flanged bushings.

Oilless flanged bushing designed for lubrication-free performance
Self-lubricating oilless flanged bushing with precision fit

Advantages of Using Oilless Flanged Bushings

  • Maintenance-Free: Oilless flanged bushings require no external lubrication, reducing maintenance costs and downtime.
  • Self-lubricating: The built-in lubrication layer ensures consistent performance and extends the lifespan of the bushing.
  • Noise Reduction: Oilless flanged bushings operate quietly, making them suitable for noise-sensitive environments.
  • High Load Capacity: Certain types of oilless flanged bushings can withstand heavy loads, making them ideal for industrial applications.
  • Resistance to Corrosion: Bronze and graphite bushings are resistant to corrosion, ensuring longevity even in harsh conditions.

Exploring the World of Oilless Flanged Sleeve Bearings

Oilless Bushing Flanged Bearing – Elevate Your Productivity

When you choose our Oilless Flanged Bushing, you’re not just buying a product; you’re investing in your business’s success. Experience increased productivity and efficiency, leading to higher profits. Don’t let friction hold you back; choose excellence today.

Bronze oilless flanged bushing with built-in solid lubricants

Flange Bronze Bushing Characteristics

Exceptional Performance under High Load, Low-Speed Operation

Oilless Flanged Bushings excel in applications where heavy loads and low speeds are prevalent. What sets them apart is their ability to perform admirably even without the need for external lubrication. This makes them a cost-effective solution for industries seeking reliable, low-maintenance bearings.

  • Excellent Wear Resistance

In scenarios where traditional lubrication methods struggle to create an oil film due to reciprocating, oscillating motions, or frequent intermittent operations, bronze Flanged Bushings shine. Their impressive wear resistance ensures longevity and reliability even in challenging conditions.

  • Remarkable Corrosion and Chemical Resistance

These bushings exhibit remarkable resistance to corrosion and chemical attacks. They can withstand exposure to water and caustic chemicals without compromising their performance, making them ideal for diverse environments.

  • Maintenance-Free and Cost-Efficient

Composition Of Oilless Flanged Bushing

Outer Sleeve: This is the outermost layer of the bushing, which provides structural support and stability when the bushing is installed. It often includes a flange for easy mounting.

Lubrication Layer: Beneath the outer sleeve lies a specially formulated lubrication layer. This layer can be made of various materials, including bronze, graphite, or plastic, depending on the specific requirements of the application.

Inner Shaft: The inner shaft, also known as the journal, is the part of the bushing that comes into direct contact with the rotating or sliding shaft of the machinery. It is precisely machined to minimize friction and wear.

Durable oilless flanged bushing used in industrial applications
Maintenance-free oilless flanged bushing with extended service life

Types of Oil-free Flanged Bushings

Oilless flanged bushings come in various types to suit different applications. The three most common types are:

  1. Bronze bushings are known for their excellent load-bearing capacity and resistance to corrosion. They are often used in heavy-duty applications where high strength and durability are essential.
  2. Flange Graphite bronze bushings are valued for their self-lubricating properties and ability to operate in high-temperature environments. They are commonly found in industrial ovens, kilns, and conveyor systems.
  3. Plastic bushings are lightweight, cost-effective, and suitable for applications where low friction is required. They find use in the automotive industry and household appliances.

Request Sizes & Pricing

Email your drawings or list the bore, OD, flange diameter and length you need. Standard items ship from stock; custom casting and machining are quoted per drawing.

Email us: una@viiplus.com

Oil-free Flanged Bearings size

Custom Bronze Bushing Solutions Tailored self lubricating Designs

Can’t find the right fit? We provide custom-engineered self lubricating bushing and replaced bearing solutions based on your technical drawings. From material selection to groove geometry, we solve your unique bearing challenges.