CuSn8 Wrapped Bronze Bushing –  092 & 090 Series Thin-wall bronze bush

In the realm of mechanical engineering, Wrapped Bronze Bushings stand as a testament to innovative design, offering superior performance in challenging environments. These thin-wall bronze bushes, cold-formed from high-density bronze strip material, are engineered to provide robust, self-lubricating solutions for heavy-duty, low-speed applications where space is often at a premium. Specifically, the 090 and 092 series represent a pinnacle in this technology, each tailored with distinct lubrication features to optimize operational efficiency and extend service life.

Precision Wrapped Bronze Bushings – Durable & Self-Lubricating

CuSn8 Bronze Bearings

At the heart of both the 090 and 092 series lies CuSn8 bronze, a high-performance copper-tin alloy. This material, composed primarily of 91.3% copper, 8.5% tin, and 0.2% phosphorus, is renowned for its exceptional mechanical strength, wear resistance, and corrosion resistance . The addition of tin significantly enhances its hardness and elasticity, while phosphorus contributes to improved wear properties and castability. The high density of CuSn8 (approximately 8.8 g/cm³) ensures that even with a thin-wall design, these bushings maintain remarkable load-bearing capabilities, making them a cost-effective and space-efficient alternative to traditional cast bronze bearings.

092 wrapped bronze bushing
090 wrapped bronze bushing thin wall bushing

Shop precision-engineered wrapped bronze bushings for heavy-duty applications. Long-lasting performance and low maintenance guaranteed.

Thin-wall bronze bush

Wrapped Bronze Bushing Solutions for Heavy Machinery

092 Series Wrapped Bronze Bushing: The Perforated Advantage

The 092 wrapped bronze bushing is characterized by its unique through-hole (perforated) design. These evenly distributed holes serve as substantial reservoirs for lubricant, facilitating excellent grease storage and distribution across the bearing surface. This design is particularly advantageous in applications requiring extended lubrication intervals or operating in environments prone to contamination, as the perforations effectively trap debris and ensure continuous lubrication. The 092 series is engineered for maximum load capacity and extended service life under arduous conditions.
Key Technical Parameters for 092 Series:
  • Material: CuSn8P0.3 or CuSn6.5P0.1 (Tin Bronze)
  • Max Load (Dynamic): 40 N/mm²
  • Max Sliding Speed: Up to 2.5 m/s
  • Hardness: 90-120 HB
  • Friction Coefficient: 0.08-0.25 (with lubrication)
092 Series Wrapped Bronze Bushing
090 Series Wrapped Bronze Bushing

090 Series Wrapped Bronze Bushing: The Diamond Pocket Innovation

In contrast, the 090 wrapped bronze bushing features a surface with meticulously rolled diamond-shaped (or round) lubrication pockets. These indents are designed to rapidly establish a lubricating film between the bushing and the shaft, providing excellent initial lubrication and maintaining it throughout operation. The diamond pocket design is highly effective in applications with frequent starts and stops or oscillating movements, where consistent lubricant delivery is crucial. The 090 series offers a balanced performance of high load capacity and effective self-lubrication.
Key Technical Parameters for 090 Series:
  • Material: CuSn8 (Tin Bronze, approx. 91.3% Cu, 8.5% Sn, 0.2% P)
  • Max Load (Dynamic): 40 N/mm²
  • Max Sliding Speed: Up to 2.0 m/s
  • Hardness: 90-120 HB
  • Tensile Strength: ~470 N/mm²
  • Thermal Conductivity: ~60 W/m·K

The Distinctive Features: 092 vs. 090 Wrapped Bronze Bushing

While both series leverage the strength of CuSn8, their primary differentiation lies in their lubrication reservoir designs, which dictate their suitability for various operational contexts.
Parameter
092 Series Wrapped Bronze Bushing
090 Series Wrapped Bronze Bushing
Material
CuSn8P0.3 / CuSn6.5P0.1
CuSn8
Lubrication Design
Through-holes (Perforations)
Diamond-shaped Pockets
Max Static Load
120 N/mm²
120 N/mm²
Max Dynamic Load
40 N/mm²
40 N/mm²
Max Sliding Speed
2.5 m/s
2.0 m/s
Hardness
90-120 HB
90-120 HB
Temperature Range
-100°C to +200°C
-100°C to +200°C
Max PV Value (Dry)
2.8 N/mm²·m/s
2.8 N/mm²·m/s
Max PV Value (Oil/Grease)
Up to 16 N/mm²·m/s
Up to 16 N/mm²·m/s
Friction Coefficient
0.08-0.25
0.08-0.25
Standard Compliance
DIN 1494 / ISO 3547
DIN 1494 / ISO 3547

090 Series Wrapped Bronze Bushing Size Chart

090 Series Wrapped bronze bushing size

D1 D0 B 0 -0.40
10 15 20 25 30 35 40 50 60 70 80 90 100
10 12 090 Series 1010 090 Series 1015 090 Series 1020
12 14 090 Series 1210 090 Series 1215 090 Series 1220
14 16 090 Series 1410 090 Series 1415 090 Series 1420 090 Series 1425
15 17 090 Series 1510 090 Series 1515 090 Series 1520 090 Series 1525
16 18 090 Series 1610 090 Series 1615 090 Series 1620 090 Series 1625
18 20 090 Series 1810 090 Series 1815 090 Series 1820 090 Series 1825
20 23 090 Series 2010 090 Series 2015 090 Series 2020 090 Series 2025
22 25 090 Series 2210 090 Series 2215 090 Series 2220 090 Series 2225 090 Series 2230
24 27 090 Series 2415 090 Series 2420 090 Series 2425 090 Series 2430
25 28 090 Series 2515 090 Series 2520 090 Series 2525 090 Series 2530
28 31 090 Series 2815 090 Series 2820 090 Series 2825 090 Series 2830
30 34 090 Series 3015 090 Series 3020 090 Series 3025 090 Series 3030 090 Series 3035 090 Series 3040
32 36 090 Series 3215 090 Series 3220 090 Series 3225 090 Series 3230 090 Series 3235 090 Series 3240
35 39 090 Series 3515 090 Series 3520 090 Series 3525 090 Series 3530 090 Series 3535 090 Series 3540
40 44 090 Series 4020 090 Series 4025 090 Series 4030 090 Series 4035 090 Series 4040 090 Series 4050
45 50 090 Series 4520 090 Series 4525 090 Series 4530 090 Series 4535 090 Series 4540 090 Series 4550
50 55 090 Series 5020 090 Series 5025 090 Series 5030 090 Series 5035 090 Series 5040 090 Series 5050 090 Series 5060
55 60 090 Series 5520 090 Series 5525 090 Series 5530 090 Series 5535 090 Series 5540 090 Series 5550 090 Series 5560
60 65 090 Series 6025 090 Series 6030 090 Series 6035 090 Series 6040 090 Series 6050 090 Series 6060 090 Series 6070
65 70 090 Series 6530 090 Series 6535 090 Series 6540 090 Series 6550 090 Series 6560 090 Series 6570
70 75 090 Series 7030 090 Series 7035 090 Series 7040 090 Series 7050 090 Series 7060 090 Series 7070 090 Series 7080
75 80 090 Series 7530 090 Series 7535 090 Series 7540 090 Series 7550 090 Series 7560 090 Series 7570 090 Series 7580
80 85 090 Series 8030 090 Series 8035 090 Series 8040 090 Series 8050 090 Series 8060 090 Series 8070 090 Series 8080
85 90 090 Series 8530 090 Series 8535 090 Series 8540 090 Series 8550 090 Series 8560 090 Series 8570 090 Series 8580 090 Series 8590
90 95 090 Series 9030 090 Series 9035 090 Series 9040 090 Series 9050 090 Series 9060 090 Series 9070 090 Series 9080 090 Series 9090
95 100 090 Series 9540 090 Series 9550 090 Series 9560 090 Series 9570 090 Series 9580 090 Series 9590 090 Series 95100

 

092 Series Wrapped Bronze Bushing Size Chart

092 Series Wrapped Bronze Bushing Size

 

D1 D0 B 0 -0.40
10 15 20 25 30 35 40 50 60 70 80 90 100
10 12 092 series 1010 092 series 1015 092 series 1020
12 14 092 series 1210 092 series 1215 092 series 1220
14 16 092 series 1410 092 series 1415 092 series 1420 092 series 1425
15 17 092 series 1510 092 series 1515 092 series 1520 092 series 1525
16 18 092 series 1610 092 series 1615 092 series 1620 092 series 1625
18 20 092 series 1810 092 series 1815 092 series 1820 092 series 1825
20 23 092 series 2010 092 series 2015 092 series 2020 092 series 2025
22 25 092 series 2210 092 series 2215 092 series 2220 092 series 2225 092 series 2230
24 27 092 series 2415 092 series 2420 092 series 2425 092 series 2430
25 28 092 series 2515 092 series 2520 092 series 2525 092 series 2530
28 31 092 series 2815 092 series 2820 092 series 2825 092 series 2830
30 34 092 series 3015 092 series 3020 092 series 3025 092 series 3030 092 series 3035 092 series 3040
32 36 092 series 3215 092 series 3220 092 series 3225 092 series 3230 092 series 3235 092 series 3240
35 39 092 series 3515 092 series 3520 092 series 3525 092 series 3530 092 series 3535 092 series 3540
40 44 092 series 4020 092 series 4025 092 series 4030 092 series 4035 092 series 4040 092 series 4050
45 50 092 series 4520 092 series 4525 092 series 4530 092 series 4535 092 series 4540 092 series 4550
50 55 092 series 5020 092 series 5025 092 series 5030 092 series 5035 092 series 5040 092 series 5050 092 series 5060
55 60 092 series 5520 092 series 5525 092 series 5530 092 series 5535 092 series 5540 092 series 5550 092 series 5560
60 65 092 series 6025 092 series 6030 092 series 6035 092 series 6040 092 series 6050 092 series 6060 092 series 6070
65 70 092 series 6530 092 series 6535 092 series 6540 092 series 6550 092 series 6560 092 series 6570
70 75 092 series 7030 092 series 7035 092 series 7040 092 series 7050 092 series 7060 092 series 7070 092 series 7080
75 80 092 series 7530 092 series 7535 092 series 7540 092 series 7550 092 series 7560 092 series 7570 092 series 7580
80 85 092 series 8030 092 series 8035 092 series 8040 092 series 8050 092 series 8060 092 series 8070 092 series 8080
85 90 092 series 8530 092 series 8535 092 series 8540 092 series 8550 092 series 8560 092 series 8570 092 series 8580 092 series 8590
90 95 092 series 9030 092 series 9035 092 series 9040 092 series 9050 092 series 9060 092 series 9070 092 series 9080 092 series 9090
95 100 092 series 9540 092 series 9550 092 series 9560 092 series 9570 092 series 9580 092 series 9590 092 series 95100

Wrapped Bronze Bushing Manufacturer | 090 & 092 Series (CuSn8) | BronzeOilless.com

Please get in touch with una@viiplus.com to receive a professional and fast quotation

Lubrication Reservoir Architectures

The effectiveness of a wrapped bronze bushing in “difficult” environments—those characterized by high dust, water exposure, or irregular maintenance—is largely due to the geometry of its lubrication reservoirs.

  1. Diamond Indents (Grease Pockets): These are the most common surface features. The diamond shape is optimized for grease retention. As the shaft rotates, it creates a pumping action that draws grease out of the pockets and across the sliding surface. This is particularly effective in oscillating movements where a full hydrodynamic film cannot be maintained by rotation alone.

  2. Spherical Indents: Similar to diamond pockets, these are hemispherical depressions. They are often used when a different lubricant release rate is desired or based on specific customer engineering requirements.

  3. Through-Hole Perforations: Some bushings feature holes punched entirely through the wall. These are designed for applications where a massive amount of lubricant is required or where the bushing is submerged in an oil bath. The through-holes act as a “sump,” allowing for longer intervals between maintenance and providing a path for contaminants to be flushed away from the shaft.

  4. Solid Lubricant Inlays: In some specialized variants, the diamond pockets are filled with solid graphite or MoS₂. This configuration allows for dry-running or boundary lubrication in high-temperature or vacuum environments where traditional oils and greases would evaporate or oxidize.

Lubrication Pattern Recommended Lubricant Ideal Application Conditions
Diamond Pockets Grease (Lithium-based)

High loads, slow speeds, oscillating motion.
Spherical Pockets Grease or Heavy Oil

General industrial use with periodic maintenance.
Through-Holes Oil or Grease

Extremely dirty environments; oil-bath systems.
Graphite Filled None (Self-lubricating)

High temperatures, inaccessible locations, dry-running.

Lubrication Reservoir Architectures

The effectiveness of a wrapped bronze bushing in “difficult” environments—those characterized by high dust, water exposure, or irregular maintenance—is largely due to the geometry of its lubrication reservoirs.

  1. Diamond Indents (Grease Pockets): These are the most common surface features. The diamond shape is optimized for grease retention. As the shaft rotates, it creates a pumping action that draws grease out of the pockets and across the sliding surface. This is particularly effective in oscillating movements where a full hydrodynamic film cannot be maintained by rotation alone.

  2. Spherical Indents: Similar to diamond pockets, these are hemispherical depressions. They are often used when a different lubricant release rate is desired or based on specific customer engineering requirements.

  3. Through-Hole Perforations: Some bushings feature holes punched entirely through the wall. These are designed for applications where a massive amount of lubricant is required or where the bushing is submerged in an oil bath. The through-holes act as a “sump,” allowing for longer intervals between maintenance and providing a path for contaminants to be flushed away from the shaft.

  4. Solid Lubricant Inlays: In some specialized variants, the diamond pockets are filled with solid graphite or MoS₂. This configuration allows for dry-running or boundary lubrication in high-temperature or vacuum environments where traditional oils and greases would evaporate or oxidize.

Common Materials for Wrapped Bushings

The strip has to roll and form without cracking, which limits the choice compared with cast alloys. Three families cover most wrapped production.

CuSn8 tin bronze

The standard wrapped bushing material. CuSn8 (CW453K) combines good strength with the formability the process needs, and it work-hardens during forming, which raises the finished hardness. It wears well against steel and is the default choice for general industrial duty. Because it is a tin bronze, wrapped CuSn8 bushings are normally grease- or oil-lubricated, with a grooved bore.

Because CuSn8 work-hardens during forming, the finished bushing is harder than the strip it came from. That is useful — it raises wear resistance — but it also means a wrapped bushing should not be heavily deformed after forming, so where a part needs significant post-forming work the material and the sequence are planned together.

 

CuSn6 tin bronze

With slightly less tin, CuSn6 (CW452K) is more ductile and forms more readily, which suits deeper draws and more demanding shapes. It is a little lower in strength and hardness than CuSn8. Where a wrapped part has an awkward geometry, or where the forming is severe, CuSn6 is often the smoother route.

CuZn brasses

Brass strip is used where the duty is lighter and cost is the deciding factor. It forms easily and machines cleanly, but carries lower load and wears faster than tin bronze. It appears in light-duty consumer and light industrial applications rather than in heavily loaded joints.

Bimetal strip

A steel backing with a bronze layer bonded to it can also be rolled into a wrapped bushing. That is a material structure question rather than a forming one, so we cover it on the composite bushings page — the forming route is the same, the material decision is different.

Selecting a material. Start with the duty. CuSn8 covers the majority of wrapped applications; move to CuSn6 where forming is difficult, to brass where the load is light and the cost target is tight, and to a bimetal or a solid-lubricated construction where the joint cannot be relubricated. Our bronze bushing material guide sets out the comparison in more detail.

Wrapped vs. Centrifugally Cast vs. Machined from Solid

Three routes produce a bronze bushing, and the right one depends more on size and quantity than on anything else. The table compares them on the factors that usually decide it.

Table 1 — Wrapped, centrifugal cast and solid bar compared
Factor Wrapped Centrifugal cast Machined from solid bar
Typical size range Small to medium; commonly up to about 100 mm bore Medium to large, including several hundred mm Any size, economic at the small end
Wall thickness Thin, typically 0.75–3 mm Heavy, 5 mm and upwards Set by the design
Material utilisation High — no swarf Moderate Lower — most of the blank is cut away
Piece cost at volume Low Moderate Higher
Cost for one or two pieces Higher — tooling to amortise Moderate Lowest — no tooling needed
Load capacity Moderate; limited by thin wall High High
Heat dissipation Good — thin wall into housing Good Good
Lead time, first part Depends on tooling Moderate Short
Geometry Cylindrical, flanged, grooved Cylindrical, flanged, complex sections Unrestricted
Typical application General duty at volume; light to moderate load Heavy load, large diameters Prototypes, oversize, non-standard

Reading the trade-off. Wrapped wins on cost per piece once the quantity justifies the tooling, and on compactness where the housing bore is fixed. Centrifugal casting takes over as the diameter and the load grow, and gives a heavier section that can be re-machined. Machining from solid is the flexible route: no tooling, any geometry, and it is normally what we use for a prototype or a one-off replacement, even when the production part will eventually be wrapped or cast.

Where each route becomes economical

The tooling for a wrapped bushing is a fixed cost, so the piece price falls as quantity rises. Below a certain quantity — it varies with size and complexity — machining from solid is cheaper even though the material costs more, because there is no tooling to recover. Centrifugal casting sits between the two and becomes the natural choice as diameter grows, since the material saved outweighs the extra processing.

In practice: one or two parts, or a prototype, usually means machining. A few hundred identical parts in a standard size usually means wrapped. A large diameter, a heavy section, or a complex shape usually means cast. Where the answer is not obvious, we will quote two routes and let the numbers decide.

If your part falls between these — too large to wrap, too small to justify a casting — we will say so and recommend the route. Where the quantity justifies it, we also machine wrapped blanks: see CNC machining bronze for the secondary operations.

Metric Sizes

The table below shows representative metric sizes from our standard range. It replaces and consolidates the size information previously published on our cast bronze metric sleeves page — if you arrived from that page, the specifications are here.

Wrapped bushings are supplied in a range of wall thicknesses for a given bore. The wall you choose sets the outside diameter, so the housing bore has to be designed around it: a 20 mm bore bushing might be 23 mm outside diameter with a 1.5 mm wall, or 24 mm with a 2 mm wall.

Table 2 — Representative metric sizes (mm)
d (bore) Wall D (OD) L range Notes
6 1.0 8 6–10 Smallest standard sizes
8 1.0 10 8–12 —
10 1.0 12 10–15 —
12 1.0 14 12–20 —
14 1.5 17 15–20 —
15 1.5 18 15–25 —
16 1.5 19 16–25 —
18 1.5 21 18–25 —
20 1.5 23 20–30 2.0 wall gives D = 24
22 1.5 25 22–30 —
25 1.5 28 25–35 2.0 wall gives D = 29
28 2.0 32 28–40 —
30 2.0 34 30–40 —
32 2.0 36 32–40 —
35 2.0 39 35–45 —
40 2.0 44 40–50 2.5 wall gives D = 45
45 2.5 50 45–55 —
50 2.5 55 50–60 —
60 2.5 65 60–70 —
70 2.5 75 70–80 Upper end of standard wrapped range
80 2.5 85 80–90 Larger sizes on request

Sizes outside this table are produced to drawing, including non-standard walls, intermediate bores, and lengths beyond the ranges shown. If you previously used our cast bronze metric sleeves page, the same size range is available here alongside the wrapped options.

Choosing wall thickness and length

Two decisions follow the bore size. Wall thickness sets the outside diameter, so it is fixed by the housing bore: with an existing housing that decides it, while on a new design a thinner wall saves space and weight and a thicker one leaves more material for wear and for re-machining. Length sets the bearing area — longer reduces the bearing pressure and improves guidance, but demands better alignment, since a long bush in a misaligned housing will edge-load at its ends.

These sizes follow the same series as ISO 3547 for wrapped bushes, so a bushing chosen from the table interchanges with parts made to that standard. Where your equipment follows a different series, or the housing is already machined, send the housing dimension and we will match to it.

Inch Sizes

The inch range below is the imperial equivalent of the metric table. It consolidates the specifications previously published on our cast bronze inch sleeves page. Inch sizes remain in steady demand for North American equipment and for maintenance of machinery built to imperial drawings, so both ranges are held.

Table 3 — Representative inch sizes
d (bore) Wall D (OD) L range Notes
1/4″ 1/16″ 3/8″ 1/4–1/2″ —
5/16″ 1/16″ 7/16″ 5/16–1/2″ —
3/8″ 1/16″ 1/2″ 3/8–3/4″ —
1/2″ 1/16″ 5/8″ 1/2–1″ Also available 3/32″ wall
5/8″ 1/16″ 3/4″ 5/8–1″ —
3/4″ 1/16″ 7/8″ 3/4–1-1/4″ Also available 3/32″ wall
7/8″ 1/16″ 1″ 7/8–1-1/4″ —
1″ 1/16″ 1-1/8″ 1–1-1/2″ Also available 3/32″ wall
1-1/8″ 1/16″ 1-1/4″ 1-1/8–1-1/2″ —
1-1/4″ 1/16″ 1-3/8″ 1-1/4–1-3/4″ Also available 3/32″ wall
1-1/2″ 1/16″ 1-5/8″ 1-1/2–2″ Also available 3/32″ wall
1-3/4″ 1/16″ 1-7/8″ 1-3/4–2″ —
2″ 1/16″ 2-1/8″ 2–2-1/2″ Also available 3/32″ wall
2-1/2″ 3/32″ 2-11/16″ 2-1/2–3″ —
3″ 3/32″ 3-3/16″ 3–3-1/2″ Larger sizes on request

Metric and inch bushings are not usually interchangeable even where the nominal conversion looks close, because the wall thickness and the housing bore follow different standard series. If you are converting an imperial drawing to metric, or the other way round, send both and we will confirm what actually fits rather than converting on paper.

Notes on the inch range

Inch-sized wrapped bushings are held for two reasons: new equipment built to imperial drawings, and the larger installed base of North American machinery that predates metrication. In the second case the drawing often specifies the bushing by outside diameter and length rather than by a standard number, so we work from the housing dimension.

The wall thicknesses listed are the common ones. A 1/2″ bore bushing with a 1/16″ wall measures 5/8″ outside; the same bore with a 3/32″ wall measures 11/16″. That difference is small on paper and significant once the housing is bored, so confirm which you need. Where the housing bore is known but the bushing is not, send the bore dimension and the shaft size and we will work back to the bushing.

On both tables. Dimensions are representative of standard production and show typical proportions. Final sizes are confirmed before manufacture, and sizes outside the tables are made to drawing. If you need a size not listed, send the bore, outside diameter, length and quantity.

Oil Grooves and Oil Holes

A wrapped bushing intended to run greased or oil-lubricated needs a way to get the lubricant to the sliding surface and to distribute it along the bore. That is what the groove pattern does. The pattern is chosen according to how the shaft moves and where the load sits.

Table 4 — Groove patterns and where they suit
Pattern Motion Characteristics
Figure-eight Rotating or oscillating Distributes lubricant well across the bore; a common general-purpose choice
Diamond Rotating Wide coverage, good for continuous rotation at moderate speed
Circular (annular) Rotating Feeds the whole circumference; often combined with an axial feed groove
Straight axial Linear or slow oscillation Runs along the length; suits linear guides and slow oscillating joints
Spiral (helical) Rotating, one direction Drives lubricant along the bore; direction-sensitive

Two rules apply whatever the pattern. The groove should not run through the loaded zone, because a groove there interrupts the oil film exactly where the load is concentrated. And the groove needs a feed — an oil hole through the wall, positioned so the housing can supply it. Where the housing feeds from one point, we drill the hole to match and, if necessary, add a distribution groove so the lubricant reaches the whole bore from that single entry.

When a groove is not needed

Not every bushing needs one. A bushing running submerged in oil, or fed by a bath or a circulating system, often runs better on a plain bore, since any groove interrupts the oil film. Solid-lubricated graphite-plugged bushings likewise do not rely on a groove, and adding one reduces the bearing area without improving lubrication. If the lubrication method is already decided, tell us and we will advise whether a groove helps.

Grooves are rolled or cut before the bore is finished, so they are part of the design rather than an afterthought. Solid-lubricated graphite-plugged bushings are a different case: the graphite itself provides the lubrication, so grooves are optional — see bush groove patterns for a fuller treatment of pattern selection.

Tolerances, Press Fit and Housing Bore

A wrapped bushing is thin-walled, which makes the fitting more sensitive than it would be for a heavy-walled cast part. Two points govern it: the housing bore must be round, and the bore will close when the bushing is pressed in.

Table 5 — Recommended fits
Feature Recommendation Note
Housing bore H7 Roundness matters more here than for a solid bush
Shaft f7 or g6 Finish Ra 0.4–0.8 μm
Interference on OD 0.03–0.08 mm Smaller values at small diameters and thin walls
Bore closure after fitting Typically 60–90% of the interference Thin walls close proportionally more than heavy ones
Housing entry chamfer Required Prevents the seam being sheared on entry

Why roundness matters. A thin-walled wrapped bushing follows its housing. If the bore is oval, the bushing becomes oval, and the clearance on the shaft is lost at two points. This is the single most common cause of a wrapped bushing failing to run freely after fitting, and it is a housing problem rather than a bushing one.

Where the seam sits. On a seamed bushing, the joint is normally positioned away from the loaded zone. If the load direction is known, tell us and the seam can be oriented accordingly; where it is not known, a seamless construction removes the question.

Fitting. Press with a mandrel or a sleeve bearing on the outside diameter, not on the flange. Because the wall is thin, the bushing will not tolerate being driven in at an angle. After fitting, check the bore and ream or burnish to the final clearance if the drawing requires it.

Custom-sized wrapped bronze bushing

High-Quality Wrapped Bronze Bushing (CuSn8) – Technical Specifications & Applications

Explore a wide range of wrapped bronze bushings tailored for custom industrial and mechanical solutions.

Design Versatility: Straight vs. Flanged Wrapped Bushing

Beyond the lubrication patterns, Wrapped Bronze Bushings offer versatility in their structural forms to meet diverse application requirements. The two primary designs are straight (cylindrical) and flanged.
  • Straight Bushings (Cylindrical): These are the standard split-type bushings primarily designed to accommodate radial loads. Their simple, cylindrical form makes them ideal for applications where axial movement is either constrained by other components or not a critical factor.
  • Flanged Wrapped Bushings: Featuring a flange on one side, these bushings are engineered to handle both radial and light axial loads. The flange provides crucial axial positioning and prevents the bushing from creeping out of its housing, making them indispensable in applications where precise axial location and thrust load support are required.
High-performance self-lubricating wrapped bronze bearing
092 Series Wrapped Bronze Bushing

Engineering Advantages of Thin-Wall Bronze Bushings

The thin-wall design of these bronze bushes offers significant engineering and economic benefits:
  • Space Optimization: The reduced wall thickness allows for more compact machinery designs, crucial in modern engineering where miniaturization and efficiency are paramount.
  • Cost-Effectiveness: Compared to traditional cast bronze bushings, the manufacturing process of wrapped bushings from strip material leads to a 30-50% reduction in copper material usage, significantly lowering raw material costs .
  • Enhanced Thermal Management: The thin-wall structure improves heat transfer efficiency, effectively dissipating heat generated during operation and preventing premature wear due to overheating.
  • Simplified Installation: The lightweight nature and precise dimensions of these bushings simplify the installation process, reducing labor costs and assembly time.

Applications of wrapped bronze bushing

Wrapped Bronze Bushings are indispensable across a wide spectrum of industries due to their robust performance and adaptability. Their ability to withstand high loads and operate in demanding conditions makes them a preferred choice in:
  • Construction Equipment: Excavators, loaders, bulldozers, and cranes, where heavy loads and abrasive environments are common.
  • Agricultural Machinery: Tractors, harvesters, and other farm equipment that require reliable performance in dusty and variable conditions.
  • Mining Equipment: Crushers, conveyors, and other heavy machinery operating under extreme pressures and harsh environments.
  • Injection Molding Machines: For mold guiding and ejector mechanisms, ensuring smooth and precise operation.
  • Hydraulic Cylinders: In rod eyes and pivot points, providing durable and low-maintenance bearing surfaces.
Heavy-duty wrapped bronze bushing installation

Frequently Asked Questions (FAQs)

Installation and Maintenance Best Practices

Proper installation and maintenance are crucial for maximizing the lifespan and performance of CuSn8 Bronze Bearings.
1.Preparation: Ensure both the shaft and housing bore are thoroughly cleaned and free from burrs. Verify that dimensions meet the specified tolerances (e.g., housing bore H7, shaft f7/h8, installed inner diameter H9) .
2.Lubrication: Initial assembly requires pre-lubrication, typically with a high-quality lithium-based grease. The unique lubrication designs of the 090 and 092 series significantly extend relubrication intervals, often up to 2000 hours under normal operating conditions.
3.Installation Method: Use specialized pressing tools for installation to ensure even pressure distribution. Avoid direct hammering, which can deform the bushing and compromise its performance.

A: The main distinction lies in their lubrication reservoir designs. The 090 series features diamond-shaped lubrication pockets on its surface, while the 092 series utilizes through-holes (perforations) for lubricant storage and distribution. Both are effective, but the choice depends on specific application requirements, such as relubrication frequency and environmental conditions.

A: No, the thin-wall design does not compromise load capacity. These bushings are manufactured from high-density CuSn8 bronze, and their optimized structural design ensures they maintain high static and dynamic load capabilities (up to 120 N/mm² static and 40 N/mm² dynamic) while offering significant weight and space savings.

A: Yes, manufacturers often provide customization services. Special dimensions, lubrication patterns, and structural modifications can be produced according to customer drawings and specific application needs.

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