Why do PTFE layers peel off during operation?

Delamination usually occurs due to poor temperature control during the sintering process at the factory, resulting in a weak mechanical bond between the porous bronze matrix and the PTFE overlay. It can also be caused by operating the bearing beyond its specified PV limit.

What dimensional tolerances should I expect from a reliable factory?

For standard industrial applications, factories should reliably hold ISO standard tolerances, typically H7 for the housing bore and m6 or f7 for the shaft, depending on whether an interference or clearance fit is required. High-precision applications may require tighter CNC controls.

How do manufacturers test the PV limit of a sliding bearing?

Reputable manufacturers use dedicated friction and wear testing rigs that simulate real-world loads and speeds over extended periods. However, many smaller factories rely on theoretical calculations. For critical applications, you should request actual test data or commission third-party testing.

Sliding Bearings

Source high-quality sliding bearings from vetted Chinese manufacturers and suppliers. Designed for importers, wholesalers, and brands seeking reliable OEM production, we connect you with top-tier factories for bulk orders, ensuring competitive pricing and strict quality control for your power transmission needs.

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Air Bearing Casters for Heavy Load Movement

Air bearing casters reduce friction for moving heavy loads. They use a thin layer of air to float objects, allowing near-frictionless movement across smooth surfaces.

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GE60ES Spherical Plain Bearing

This spherical plain bearing is designed for applications requiring high load capacity and accommodation of misalignments. Its spherical design allows for angular movement, reducing stress and wear.

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Wrapped Bronze Sliding Bushing

This wrapped bronze bearing is constructed from CuSn8 tin-bronze with diamond oil sockets on the surface for enhanced lubrication. It excels in heavy load, low running velocity conditions, making it suitable for agricultural, construction, and engineering machinery.

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Powder Metallurgy Oil-Retaining Bearing

This sintered bronze bearing is designed for self-lubricating applications. It is manufactured using powder metallurgy techniques creating a porous structure that retains lubricating oil, providing continuous lubrication and reducing friction.

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Solid Lubricant Inlaid Bushing

This solid lubricant inlaid bushing is designed for maintenance-free operation and reliable performance. The bearing is suitable for high static and dynamic loads, with a low coefficient of friction.

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Lead-Free Marginal Lubricating Bushing

This lead-free bushing offers good load capacity and anti-wear properties. It is designed with a bronze alloy matrix and solid lubricant plugs for wear resistance, low friction, and extended service life.

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Self-Lubricating Bronze Bushing with Solid Lubricant Plugs

This self-lubricating bushing is constructed from a high-strength bronze alloy with embedded solid lubricant plugs. It excels in high-load, low-speed environments, providing continuous lubrication and reducing wear.

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Radial Spherical Plain Bearing

This radial spherical plain bearing is designed for oscillating or rotating movements. The spherical inner ring allows for misalignment compensation, reducing stress and extending service life.

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Radial Spherical Plain Bearing GEH240XT 2RS

The GEH240XT 2RS radial spherical plain bearing is designed for heavy-duty applications requiring high load capacity and misalignment accommodation. It features a steel-on-steel sliding contact surface, providing excellent wear resistance, and includes seals on both sides for contaminant protection and lubricant retention.

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Radial Spherical Plain Bearing GEZ 152ES 95ES 2RS

This radial spherical plain bearing is designed for heavy-duty applications, offering exceptional load-bearing capacity and durability. Featuring a self-aligning design to accommodate misalignment and reduce stress on connected components.

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Metric Radial Spherical Plain Bearing 110mm Bore

This metric radial spherical plain bearing is designed for high load capacity and misalignment compensation. It features a steel-on-steel sliding contact surface and seals for contamination protection.

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Radial Spherical Plain Bearing GEGZ 101 Es 114 Es 2RS

This radial spherical plain bearing is designed for applications requiring oscillating movements and heavy loads. The 2RS designation signifies seals on both sides for enhanced protection against contaminants.

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Bronze Sliding Bushing 85x90x70mm

Bronze bushings are cylindrical components that reduce friction between moving parts. The oilless bearings are made from a bronze alloy, which provides wear resistance and load-bearing capabilities.

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70mm Spherical Plain Bearing

This 70mm spherical plain bearing is designed with steel-on-steel sliding contact surfaces. The bearing is sealed to prevent contamination and retain lubricant, which extends its service life.

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Spherical Plain Bearing 480 x 680 x 340 mm

This spherical plain bearing measures 480 mm (bore) x 680 mm (outer diameter) x 340 mm (width). It is engineered to accommodate misalignment between the housing and shaft, providing reliable operation under heavy loads.

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Bronze Alloy Bushings

These steel-backed bronze alloy bushings feature solid lubricants for high load capacity and high-speed use. The self-lubricating design ensures maintenance-free operation.

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Marginal Lubrication Sliding Bearing

This sliding bearing has a POM layer of 0.03-0.50mm for anti-abrasion and low friction. Its bronze powder layer, 0.2-0.35mm thick, provides high load capacity, anti-abrasion, and good thermal conductivity, strengthening the combination of the POM layer and steel plate.

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Oilless Lubricating Sliding Bearing

These oilless sliding bearings feature a PTFE/Pb composition that creates a lubricating film during operation. A bronze powder layer strengthens the combination of the steel plate and PTFE layer while also transferring heat efficiently.

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Sourcing sliding bearings (often referred to as plain bearings or bushings) at volume requires strict attention to material composition and dimensional tolerances. Whether you are procuring standard self-lubricating bushings for distribution or engineering custom bimetallic bearings for heavy machinery, the core challenge is finding a factory that maintains consistent metallurgical quality and machining precision across large production runs.

Key Material Specifications

The performance of a sliding bearing is dictated by its material structure and its PV limit (the maximum allowable product of pressure and velocity). Buyers must clearly specify the exact alloy compositions and backing materials, as factories often substitute lower-grade metals if specifications are vague.

Material Type	Primary Application	Key Characteristic
PTFE-Lined (DU)	Dry running, high continuous loads	Extremely low friction without external lubrication
POM-Lined (DX)	Marginal lubrication environments	Excellent wear resistance under dirty conditions
Solid Cast Bronze	Heavy load, low speed applications	High structural integrity and corrosion resistance
Bimetallic	High impact and oscillating loads	Low-carbon steel backing sintered with bronze alloy

Manufacturing Red Flags and Quality Control

A supplier's capability is directly tied to their sintering furnaces and CNC machining precision. Inconsistent temperature control during the sintering process leads to poor bonding between the steel backing and the porous bronze layer, resulting in catastrophic delamination in the field.

To prevent this, serious buyers rely on thorough Factory Audits to verify equipment maintenance logs and raw material sourcing records before placing an order.

Critical Pre-Shipment Inspection Points

Dimensional tolerances (specifically inner/outer diameter to ISO H7/m6 standards).
Surface roughness (Ra) of the sliding layer to ensure minimal initial wear.
Adhesion testing of the PTFE or POM layer to the bronze matrix.
Verification of raw material certificates (especially copper and tin percentages in bronze alloys).

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Beware of Material Substitution

In solid bronze and bimetallic bearings, the cost is heavily driven by copper prices. Unverified suppliers may reduce the tin or copper content and increase cheaper elements like zinc or lead, compromising the bearing's load capacity. Always require independent material analysis.

Production Realities: MOQs, Pricing, and Lead Times

China's primary manufacturing hub for sliding bearings is located in Zhejiang province (particularly around Jiashan), which houses hundreds of factories ranging from small workshops to highly automated facilities.

Pricing is highly sensitive to global metal commodities. When sourcing custom dimensions or proprietary alloys through OEM/ODM Services, expect higher tooling costs and minimum order quantities.

3,000 - 5,000

Standard MOQ (Pcs)

For standard catalog sizes.

10,000+

Custom MOQ (Pcs)

For custom dimensions or non-standard alloys.

30 - 45

Lead Time (Days)

Typical production time after sample approval.

Because sliding bearings are dense and heavy, shipping costs can heavily impact your landed unit price. Implementing strict Quality Control & Inspection at the factory is vital; discovering out-of-tolerance parts after they have crossed the ocean is a costly error.

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Frequently Asked Questions

Success in sourcing sliding bearings relies on moving beyond surface-level catalog specifications to verify the actual metallurgical integrity and machining consistency of the supplier. Partnering with experienced professionals ensures you secure reliable components that protect your product's reputation.

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