SF-1D Hydraulic bearing is developed on the basis of SF-1P and meanwhile considering the motion way of oil pump and damper. It is the substitute of and parallels in performance with abroad DP4. In addition to covering the same usage of SF-1P, SF-1D in particular, its frequently reciprocating motion with a high side force. It is a tendency to gradually replace SF-1P with SF-1D, the latter will Cover a Wide application in automobile, motor dampers,s and oil pumps, etc.
The SF-1D bushing is a steel backed PTFE lined oilless plain bearing supplied with an electrolytic tin plated outer diameter, intended for hydraulic components and wet operating environments where corrosion of the bearing shell governs service life rather than lining wear. The shell consists of a tin plated steel backing, a sintered bronze interlayer, and a PTFE based sliding layer that permits dry running with a friction coefficient between 0.04 and 0.18. The tin layer forms a barrier at the housing interface, limiting rust creep under repeated wetting and drying cycles. Dynamic load capacity reaches 140 N/mm² with a maximum PV of 3.6 N/mm²·m/s dry running. Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and plating thickness, with plating and dimensional records available for project documentation.
Corrosion control. Tin plating on the outer diameter limits rust at the housing interface in humid, condensing, and washdown duty.
Dry running. The PTFE lining removes grease supply from hydraulic assemblies and eliminates lubricant leakage into the wet zone.
Geometry stability. The steel backing holds bore roundness and clearance under reversing load in thin wall housings.
Press fit repeatability. Controlled plating thickness keeps interference within the elastic range of the shell for automated assembly.
Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and plating thickness. Batches are supported with dimensional inspection records covering bore tolerance, wall thickness variation, and lining adhesion.
Plating thickness and neutral salt spray reference data can be supplied where the project requires corrosion documentation. Prototype quantities and volume orders are both accepted.
Tin provides a corrosion barrier with better ductility in thin coatings than copper, which reduces cracking during press fit. Copper plating remains available where housing material or galvanic compatibility calls for it.
Yes. The PTFE lining is designed for dry running. Where seals permit film carryover, residual hydraulic fluid acts as a supplemental medium. Where the cavity is fully dry, the 3.6 N/mm²·m/s PV limit and 2 m/s speed limit apply.
The housing bore is machined to ISO H7 with a lead in chamfer. The bushing is pressed with a flat faced mandrel contacting the full face rather than the bore edge. Plating thickness is controlled so interference stays within the elastic range.
Neutral salt spray performance depends on plating thickness and exposure conditions. Test duration and acceptance criteria are agreed during project review against the target environment, and reference data can be supplied with production batches.
Replace when the PTFE lining is worn through and the bronze interlayer becomes visible, when radial clearance exceeds the assembly limit, or when plating disruption or rust staining appears at the housing interface. Intervals can be fixed during prototype validation against the actual wetting cycle.
| 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
- Development basis: Developed from SF - 1P, considering the motion of oil pumps and dampers.
- Performance equivalence: A substitute for foreign DP4 with comparable performance.
- Motion suitability: Ideal for frequently reciprocating motion with high side force.
Applications
- Automotive industry: Widely used in automobiles.
- Motor - related: Applied in motor dampers.
- Pump systems: Used in oil pumps.
Founded in 2014, Shuangnuo has 10 years of experience in the industry.
Strong production capacity ensures that we can organize material production for customers as soon as possible and shorten the production cycle.
There are more than 5,000 cooperative customers around the world.
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Zhejiang Shuangnuo Bearing Technology Co., Ltd. specializes in the production of various self-lubricating copper alloy products such as SF-1D Tin Plated Steel Backed PTFE Oilless Bushing, Anti-rust Self-lubricating Sliding Bearing for Hydraulic & Wet Environment.
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Wholesale SF-1D Tin Plated Steel Backed PTFE Oilless Bushing, Anti-rust Self-lubricating Sliding Bearing for Hydraulic & Wet Environment Suppliers
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