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Home / Product / SF-1 Oilless Bearing / SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing
Wholesale SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing
SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing
  • SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing

SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing

Product Description:

SF- 1P Reciprocating motion bearings, are based on the structure of the SF-1 material, according to the special conditions a total of reciprocation and design novel formulations, its performance and foreign DD2 similar. Because it does not lead, it is in line with the environmental requirements.

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SF-1P / DD2 Series

SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing

Reciprocating Motion Composite Structure Oilless Plain Bearing Drawing Based Supply
140 Dynamic load N/mm²
3.6 PV limit N/mm²·m/s
280 Max temp °C
Product Overview Reciprocating duty selection note

The SF-1P DD2 bushing is a composite plain bearing configured for reciprocating motion, where the lubrication film is repeatedly interrupted and rebuilt within each stroke. The construction combines a steel backing, a sintered bronze interlayer, and a PTFE based sliding layer with a formulation adjusted for short stroke oscillation and reversing direction. Dynamic load capacity reaches 140 N/mm² with a maximum PV of 3.6 N/mm²·m/s, and the friction coefficient typically falls between 0.04 and 0.18. Because reciprocating motion concentrates wear at stroke reversal points, the lining thickness and bronze interlayer porosity are controlled to maintain a continuous transfer film across the full stroke length. Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and plating, and can be supplied with additional lubrication features for mixed lubrication duty.

A Stroke Reversal Zones Wear concentrates at the two ends of the stroke. Lining thickness and transfer film continuity are controlled across the full stroke length.
B Film Rebuilding Each reversal interrupts the lubricant film. PTFE transfer to the shaft restores the low friction layer at the start of each stroke.
C Heat Accumulation Short strokes at high frequency raise surface temperature. The sintered bronze interlayer conducts heat away from the contact zone.
D Contamination Control Reciprocating shafts draw dust into the bore. Wiper or seal provisions are recommended in dusty environments.
Core Advantages
Lining formulation adjusted for reversing motion and short stroke duty Dry running removes lubricant supply from the assembly Steel backing maintains bore geometry under reversing loads Stable friction from -200°C to 280°C Optional lubrication features for mixed lubrication duty Batch geometry control supports automated press fit
Product Characteristics
Structure: steel backing, sintered bronze, PTFE based lining Friction coefficient: 0.04 to 0.18 Static load capacity: up to 250 N/mm² Dynamic load capacity: up to 140 N/mm² Maximum PV value: 3.6 N/mm²·m/s dry running Bore tolerance: ISO H7 to H8 by size class
Application Scenarios
Reciprocating Machinery Piston rod guides, damper shafts, pneumatic cylinder bushings, shock absorber guides
Automotive Systems Strut rod bushings, seat adjustment slides, pedal pivot bearings, latch mechanisms
Industrial Equipment Linear actuator guides, valve stem bushings, pump plunger guides, indexing slide bearings
Custom Projects Short stroke oscillating mechanisms, reversing linear slides, mixed lubrication assemblies
Supply and Customization Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, lubrication groove or hole positions, and surface treatment. Production batches are supported with dimensional inspection records covering bore tolerance, wall thickness variation, and lining adhesion. Prototype quantities and volume orders are both accepted, and packaging can be aligned with line side presentation.
ID: 3-300mm Wall: 0.5-5mm Grooves or Holes: Optional Documents: On Request
Frequently Asked Questions

Reciprocating motion interrupts the lubricant film at each stroke reversal, and wear concentrates at the two ends of the stroke. The SF-1P lining formulation and interlayer structure are controlled so that a PTFE transfer film is rebuilt quickly after each reversal, reducing edge wear and friction spikes at the turning points.

Short strokes with high cycle frequency accumulate heat and load the reversal zones more heavily. For short stroke duty, the allowable PV should be reduced below the 3.6 N/mm²·m/s dry running limit. Stroke length, cycle frequency, and load should be reviewed together during selection.

Yes. The PTFE based lining is designed for dry running. In pneumatic cylinders, the lubricant present in the air supply is generally sufficient as a supplemental medium. Where the air supply is fully oil free, the dry running PV limit applies.

Recommended shaft hardness is 200 to 600 HV with surface roughness Ra 0.2 to 0.4 micrometers. A smoother finish reduces transfer film disruption. Where dust is present, a wiper or rod seal ahead of the bushing is recommended to prevent abrasive ingress.

Replace when the PTFE 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. Because wear concentrates near the stroke reversal points, inspect the bore ends rather than the center.

Series SF-1P / DD2
Structure Steel / Bronze / PTFE
Motion Type Reciprocating
Dynamic Load 140 N/mm²
Customization Drawing Based
Max. load Static   250N/mm²
Very low speed   140N/mm²
Rotating oscillating   60N/mm²
Max.PV(dry running) Short-term operation   3.6N/mm²•m/s
Continuous operation   1.8N/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
- Design: Based on SF - 1 structure, designed for reciprocating motion
- Performance: Similar to foreign DD2
- Eco - friendly: Lead - free, meets environmental needs
 
Applications
- Machinery: For equipment with reciprocating - motion parts like engines and compressors

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Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing Suppliers and Wholesale SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain 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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