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Wholesale SF-2 DX Boundary Lubricating Bushing, Steel Backed POM Composite Split Sliding Bearing

SF-2 DX Boundary Lubricating Bushing, Steel Backed POM Composite Split Sliding Bearing

Product Description:

SF-1T is composed of a specially designed surface layer of PTFE formulations and is specifically applied for the high PV bushes of gear oil pumps. It is to be used in hydrodynamic or boundary lubricating conditions of medium or high-pressure gear oil pumps such as P=16-25 Mpa, V=3.5-5m/s. it shows the benefits of low friction coefficient, wear resistance, and anti-impact properties. At hydrodynamic lubrication, the PV limit reaches 120N/mm'.m/s.It is the best choice for the bushes of various kinds of gear pumps as well as plunger pumps, vane pumps, and so on.

SF-2 DX Steel Backed POM Composite Split Type

SF-2 DX Boundary Lubricating Bushing, Steel Backed POM Composite Split Sliding Bearing

Supply Positioning Project based supply for OEM assembly lines. Bushings are produced to drawing with controlled wall thickness, split gap, and lining adhesion. Prototype batches and volume orders are both accepted.
140 Dynamic Load N/mm²
2.5 PV Limit N/mm²·m/s
130 Max Temp °C
Product Overview

The SF-2 DX bushing is a steel backed composite sliding bearing with a POM based boundary lubricating layer, supplied in a split configuration so it can be mounted onto a shaft without removing adjacent components. The structure combines a steel backing, a sintered bronze interlayer, and a POM sliding layer containing lubricant pockets that retain grease and release it under load. Rated dynamic load is 140 N/mm² with a maximum PV of 2.5 N/mm²·m/s, and the friction coefficient typically falls between 0.08 and 0.20. The split design is intended for gearbox shafts, linkage pins, and hydraulic cylinder joints where shaft removal is not practical. Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, split gap, chamfer, and plating.

L1 POM Boundary Layer POM based sliding layer with lubricant pockets. Retains grease and releases lubricant under load in boundary lubrication conditions.
L2 Sintered Bronze Interlayer Porous bronze structure bonds the POM layer to the steel backing and conducts frictional heat away from the sliding surface.
L3 Steel Backing Cold rolled steel base delivers structural rigidity, press fit stability, and high static load capacity in thin wall sections.
L4 Split Configuration Axial split allows installation onto an existing shaft. Split gap, edge break, and spring behavior are controlled to drawing.
Core Advantages
Split design enables installation without shaft disassembly POM boundary layer retains grease and reduces relubrication frequency Steel backing provides rigidity and press fit stability in thin wall housings Controlled deformation under high static load Compatible with grease lubrication and marginal lubrication conditions Consistent batch geometry supports automated press fit assembly
Product Characteristics
Structure: steel backing plus sintered bronze plus POM lining Friction coefficient: 0.08 to 0.20 under boundary lubrication Static load capacity: up to 250 N/mm² Dynamic load capacity: up to 140 N/mm² Maximum sliding speed: 2 m/s with grease lubrication Operating temperature: -40°C to 130°C
Application Scenarios Split configuration is selected where the shaft cannot be removed during service
Gearbox shaft bushings Hydraulic cylinder pivot joints Automotive steering linkages Agricultural machinery pivot points Construction equipment joints Industrial pump shaft bearings Conveyor system pivot bushings Custom split bearing assemblies
Supply and Customization Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, split gap, chamfer configuration, and surface treatment. Production batches are supported with dimensional inspection records covering bore tolerance, wall thickness variation, split gap consistency, and lining adhesion. Packaging and labeling can be aligned with customer production line requirements.
ID: 10-300mm Wall: 1-5mm Split Gap: To Drawing Documentation: On Request
Frequently Asked Questions

SF-2 DX uses a POM boundary lubricating layer designed for grease lubricated or marginally lubricated conditions, while SF-1 DU uses a PTFE lining designed for dry running. SF-2 DX is generally preferred where grease supply is available and higher load capacity is required.

The split bushing is opened slightly and positioned over the shaft, then seated into the housing bore. The split gap closes under housing constraint. Where access permits, the bushing is first installed into the housing and the shaft is then inserted.

Lithium based greases with NLGI grade 2 are commonly used. For applications running near the 130°C limit, select greases rated above 130°C. Replenishment intervals depend on load, speed, and operating temperature.

Recommended shaft hardness is 200 to 600 HV with surface roughness Ra 0.2 to 0.4 micrometers. Hardened and ground steel or hard chrome plated shafts provide the longest lining service life and the most stable friction behavior.

Replace when the POM lining is worn through and the bronze interlayer becomes visible, when radial clearance exceeds the assembly limit, or when friction and operating noise increase noticeably. Replacement intervals can be defined during prototype validation.

Max. load Static   250N/mm²
Very low speed   140N/mm²
Rotating oscillating   60N/mm²
Max.PV(dry running) Short-term operation   60N/mm²•m/s
Continuous operation   4.3N/mm²•m/s
Temp. limit   -195℃~+280℃
Friction coefficient   0.05~0.20μ
Max. speed Dry running   2m/s
Hydrodynamic operation   >2m/s
Thermal conductivity   42 W(m•k)-1
Coefficient of thermal expansion   11×10-⁶•K-1

Features
1. Material: PTFE surface layer
2. Performance: Low friction, wear - resistant, anti - impact
3. PV Limit: 120N/mm²M/S at hydrodynamic lubrication
 
Applications
1. Lubrication: Hydrodynamic or boundary
2. Pump Type: Medium/high - pressure gear oil pumps (P = 16 - 25 Mpa, V = 3.5 - 5m/S)
3. Scope: Gear, plunger, vane pumps etc.

Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China SF-2 DX Boundary Lubricating Bushing, Steel Backed POM Composite Split Sliding Bearing Suppliers and Wholesale SF-2 DX Boundary Lubricating Bushing, Steel Backed POM Composite Split Sliding Bearing Company, we are a manufacturer specializing in producing various self-lubricating copper alloy products using centrifugal casting, continuous casting, metal mold casting, and other processes. Its main products include brass, aluminum bronze, tin bronze, and others produced according to national standard grades. It processes and produces various solid inlaid self-lubricating bearing products on this basis . At the same time, it uses sintering technology to produce bimetallic products and many other types of products. Since its establishment nearly 10 years ago, the company has focused on the research development, and production of various new self-lubricating bearings.

In the process of product production, our company has always insisted on independent casting production of raw materials to ensure the quality of products from the source; during the casting process, the whole process is monitored, and the finished product is tested by spectrometer three times before, in and after the furnace to confirm the material composition of the product. The national testing agency is regularly commissioned to test the material composition and mechanical properties of the product, and authoritative test reports can be provided to customers in need; the company implements integrated production from material to finished product processing and has more than 80 sets of advanced CNC machine tools, CNC lathes, machining centers, and other major equipment. The strong production capacity ensures that the material production is organized for customers for the first time, shortening the production cycle.
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    Establishment

    Founded in 2014, Shuangnuo has 10 years of experience in the industry.

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    Advanced Equipment

    Strong production capacity ensures that we can organize material production for customers as soon as possible and shorten the production cycle.

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    Happy Clients

    There are more than 5,000 cooperative customers around the world.

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