A split bushing is a plain sleeve bearing manufactured in two precisely matched halves. Unlike a conventional one-piece bushing, it can be installed or replaced around the shaft without removing the shaft from the machine. Once the housing is assembled, the two halves form a complete cylindrical bearing surface that supports radial loads much like a solid sleeve bushing.

For demanding applications, self-lubricating split bushings with embedded graphite can operate without regular external lubrication, making them suitable for locations where maintenance access is limited or grease lubrication is impractical.

Designed for Maintenance-Critical Applications

In industries such as mining, marine, construction, and heavy equipment, the cost of downtime can far exceed the price of the replacement bearing. When a conventional bushing fails at a critical pivot or support point—such as an excavator boom pivot, crane joint, or marine rudder assembly—the repair may require extensive disassembly.

Removing a one-piece bushing can mean dismantling surrounding components, extracting the shaft, and overcoming tight interference fits. Depending on the machine and installation location, this can turn a relatively simple bearing replacement into a lengthy maintenance operation.

Split bushings provide a practical alternative. The two-piece design allows the worn bushing to be removed and a new one installed around the shaft, helping reduce disassembly work and minimize equipment downtime.

At BronzeOilless.com, we manufacture custom split bronze bushings, including self-lubricating designs with embedded solid lubricants, for heavy-duty applications where reliable operation and simplified maintenance are essential.

How a Split Bushing Is Built

A split bushing starts life as the same bronze, brass or steel body as a solid sleeve. The body is then cut into two half-shells along a split line — usually a plain axial cut, sometimes stepped or dowelled so the halves locate positively against each other. Once the housing caps close, the joint faces clamp together and the bore behaves as one continuous bearing surface.

The split line is positioned away from the loaded zone where the housing allows it, so neither joint edge sits under the peak load. Flanged, double-flanged and plain OD variants follow the same conventions as one-piece bushings.

Why Split: The Captive Shaft Problem

The reason split bushings exist is downtime. When a solid bushing fails at the main pivot of an excavator, the rudder stock of a vessel or a line shaft running through a dozen housings, replacing it means pulling the shaft: couplings off, gearboxes opened, interference fits overcome. That is days of work for a bearing that costs a fraction of the lost production.

A split bushing opens around the shaft in place. The shaft, couplings and adjacent machinery stay untouched, and the swap typically takes hours instead of days. That trade — slightly lower stiffness at the joint versus a fraction of the downtime — is what decides the specification.

Types of Split Bushings

• Plain axial split (two half-shells) — the standard form for machine rebuilding and line-shaft support positions
• Double-flange split bushings — carry axial load at both ends; used where the housing has no separate thrust face
• Stepped / dowelled split — the joint is keyed so the halves cannot shift; for reversing or oscillating loads
• Graphite-plugged (self-lubricating) split bushings — solid lubricant plugs embedded in the halves; no grease fittings, see the JZW split bearing series
• Steel split bushings — GCr15 or cast iron bodies with graphite plugs for heavy, dry or oiled duty at lower material cost than bronze

Deep Dive: The Anatomy of a Split Bushing

A Split Bushing (or split bearing) is a sliding bearing that has been manufactured in two distinct halves (180° segments). While the concept seems simple, the engineering behind a high-performance split bushing is precise.

1. Types of Split Designs

• Straight Cut: The most common design where the bushing is cut vertically along the axis. Ideal for standard housings.

• Angled/Slant Cut: The cut is made at an angle to the axis. This is often used to prevent the “grooving” of the shaft or to ensure smoother operation as the shaft rotates over the split line.

• Fracture Split: Used in specific high-precision connecting rods, though less common in large bronze bushings.

• Clinching/Interlocking: Some custom split bushings feature interlocking keys to ensure the two halves remain perfectly aligned during installation.

2. How It Solves the “Captive” Problem

In many machine designs, the bearing is “captive” between flanges, gears, or other immovable components. A solid bushing simply cannot be installed without removing those components. A Split Type Bushing can be placed around the shaft and slid into the housing, bypassing the need to remove the shaft entirely.

Split Bushing Materials

The same alloys used for solid sleeves serve the split designs. The table lists the three grades most often specified, with the duty each one fits.

Steel-body versions (GCr15 bearing steel, HT250 cast iron) sit alongside the bronzes where load is heavy and corrosion exposure is low; their material data is collected on the steel bushing page.

The BronzeOilless Advantage: Solid Lubricant Technology

One of the technical challenges with split bushings is maintaining a hydrodynamic oil film, as the split line can interrupt oil flow. This is why Solid Lubricant Split Bushings are technically superior for many applications.

How Our Technology Works

We drill a precise pattern of holes into the bronze alloy (covering 25-30% of the surface area) and plug them with a proprietary Solid Lubricant mixture (primarily Graphite and PTFE binders).

1. Transfer Film: Upon movement, the solid lubricant smears onto the shaft, creating a low-friction transfer film.

2. Dry Running Capability: Even if external grease supply fails, the bearing will not seize.

3. High Temperature Split Bearings: Standard grease degrades at 150°C. Our graphite-plugged split bushings can operate continuously at temperatures up to 400°C (ideal for steel mills and furnace conveyors).

Manufacturing & Customization Capabilities

Manufacturing a split bushing requires tighter tolerances than a solid one. When a tube is cut in half, internal material stresses can cause it to spring open or warp (“out of round”).

At BronzeOilless.com, we utilize advanced manufacturing processes to ensure precision:

• Stress Relieving: Heat treatment prior to machining to minimize warping after cutting.

• Re-Machining: After splitting, we often re-clamp the two halves and finish-machine the Inner Diameter (ID) and Outer Diameter (OD) to ensure a perfect circle (H7 tolerance).

• Fixing Methods: We can machine custom features to prevent the bushing from rotating in the housing, such as:

  • Flanges with bolt holes.

  • Radial holes for securing pins.

  • Keyways or locator notches.

Typical Applications

• Marine — rudder stock and steering gear supports, deck machinery (see also our bronze bushing catalogue)
• Hydropower and water control — gate hinges and sluice mechanisms where the shaft stays in the civil structure
• Mining and crushing — eccentric and screen shafts rebuilt in place during short shutdowns
• Paper, steel and conveyor lines — long line shafts passing through multiple housings
• Mold and die — large press guide positions converted from greased bronze during overhaul

How to Install a Split Bushing

1. Clean and measure the housing bore. Check for roundness — an out-of-round housing clamps the halves unevenly and closes the clearance on one side.
2. Orient the split line. Place it 45° away from the load direction where the housing permits, so neither joint edge carries the peak load.
3. Fit the lower half into the housing seat; confirm it sits fully home with no rock.
4. Lower or close the shaft onto the lower half, then fit the upper half around it.
5. Close the housing caps to the specified bolt torque, torqueing in stages and diagonally to seat the joint faces evenly.
6. Verify the running clearance with feeler gauges at several positions, and rotate the shaft by hand before start-up.

For graphite-plugged halves, a thin assembly paste on the flange or thrust faces protects them during the first rotations while the solid lubricant film forms on the shaft.

Get Your Custom Split Bushing Quote

Standard catalogs rarely have the exact split bearing you need. That is where we thrive.

Why choose BronzeOilless.com?

• No Minimum Order: Whether you need 1 replacement piece for an emergency repair or 1,000 pieces for OEM production.

• Speed: Fast manufacturing turnaround for breakdown situations.

• Expertise: We machine to your exact drawings and tolerances.

Ready to reduce your maintenance costs?
[Contact Our Engineering Team] – Upload your drawing or describe your requirement, and we will provide a quote within 24 hours.

Related Products

• Split bushing with solid lubricant (bronze series)
• Split bearings — JZW self-lubricating series
• Split steel bushings — graphite-embedded
• Graphite-plugged bronze half bushings
• Bronze bushings — full catalogue
• Bronze wear plates and slide plates