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DU Bushing Engineered for Oscillating Automotive Damper Duty
Model DP-4 / SF-1D | Brand XIAYI | Certified IATF16949:2016
The DP-4 DU bushing is a maintenance-free, self-lubricating plain bearing built for damper rods, suspension pivots, and linkage systems that run in continuous oscillating motion. Its tri-layer composite — a low-carbon steel backing, a sintered porous bronze interlayer, and a PTFE-based anti-friction running surface — delivers stable, low-friction guidance from -195oC to +280oC without external grease or oil systems.
Performance at a Glance
-195oC to +280oCOperating temperature range
250 N/mm²Static load capacity
140 N/mm²Dynamic load capacity
0.04 – 0.20Coefficient of friction, dry running
How the Tri-Layer System Works
Every layer has a dedicated role, so the bushing keeps performing precisely when operating conditions become demanding:
PTFE + fibre surface layer (0.01 – 0.03 mm): a self-lubricating anti-friction face that transfers a micro-thin film onto the mating shaft, lowering friction and shielding both components from wear.
Sintered porous bronze interlayer (0.20 – 0.35 mm): conducts heat away from the contact zone, stores lubricant as a built-in reserve, and bonds the steel backing to the PTFE layer.
Low-carbon steel backing: carries heavy loads, holds dimensional stability under stress, and dissipates heat into the housing.
Copper/tin plating (0.002 mm): protects the steel backing against corrosion in humid or chemically exposed assemblies.
Technical Specifications
Parameter
Value
Model
DP-4 / SF-1D
Operating Temperature Range
-195oC to +280oC
Load Capacity (Static)
Up to 250 N/mm²
Load Capacity (Dynamic)
Up to 140 N/mm²
Max Sliding Speed (Dry)
2.5 m/s
Coefficient of Friction (Dry)
0.04 – 0.20
Surface Layer Thickness
0.01 – 0.03 mm
Shaft Tolerance Recommendation
h7 – h9
Housing Tolerance Recommendation
H7
Shape Options
Cylindrical, Flanged, Thrust Washer
Common Operating Concerns, Answered
"Oscillating motion pushes grease out of the contact zone, so greased bushings need frequent re-lubrication."
The DP-4 lubricates itself. The PTFE surface re-forms its transfer film on the shaft during every oscillation cycle, keeping friction low and consistent without scheduled maintenance access.
"High ambient heat in engine bays and exhaust areas causes standard bushings to seize or soften."
With an upper limit of 280oC, the DP-4 holds its dimensional stability and friction performance far above the thermal threshold of greased bronze. The steel backing continuously conducts heat out of the interface.
"Pivot points in sealed assemblies cannot be reached for periodic lubrication."
The DP-4 is designed for fit-and-forget installation. No grease nipples, oil lines, or lubrication schedules are required, while the sintered bronze interlayer acts as a reserve lubricant reservoir for extended service.
"Startup shock loads deform plain bearings and leave permanent marks on the contact surface."
The steel-backed composite handles static loads up to 250 N/mm² without permanent deformation, resisting brinelling while the PTFE layer delivers immediate low-friction sliding the moment movement begins.
Where It Excels
Automotive dampers and shock absorber pivot points
Suspension linkages, spring shackles, and kingpin bushings
Steering columns and pedal pivot assemblies
Heavy vehicle and commercial chassis systems
Agricultural and construction equipment linkages
Industrial automation joints and conveyor rollers
Built for OEM and Aftermarket Programs
Engineering support
Custom inner diameter, outer diameter, length, and flange dimensions
Material and tolerance selection guidance for your housing and shaft
Prototype samples for validation before volume production
Production capability
IATF16949:2016 certified quality system
Monthly capacity above 50,000 pieces
Standard lead time of approximately 2 weeks after drawing approval
Frequently Asked Questions
Q: How does a DU bushing behave under oscillating motion compared with continuous rotation?
The PTFE transfer film is equally effective in both motion types. Oscillating duty actually benefits the most, because the film is re-deposited across the same contact zone on every cycle, keeping friction low throughout the service life.
Q: What shaft hardness and finish do you recommend for DP-4 bushings?
Hardened shaft surfaces of approximately 45 HRC or above with a finish of Ra 0.2 – 0.4 µm deliver the longest wear life. Recommended shaft tolerance is h7 – h9 with an H7 housing bore.
Q: Can the DP-4 handle edge loading or misalignment in damper pivots?
Yes. Flanged and thrust washer versions distribute axial loads across a wider area. For severe edge loading conditions, our engineering team can review the length-to-diameter ratio and recommend the optimal configuration.
Q: Is a run-in period required before applying full load?
A short run-in at moderate load is recommended to establish the transfer film on the mating shaft. After this brief period, the bushing operates at its full rated load and speed.
Q: How are DP-4 bushings installed?
They are press-fitted into an H7 housing bore. Chamfered housing edges ease insertion and prevent edge damage. For most applications no additional locking devices are needed once the press fit is achieved.
Q: What is the lead time for OEM damper production orders?
Standard delivery is approximately 2 weeks from drawing approval and payment. Production capacity exceeds 50,000 pieces per month, ensuring reliable supply for scheduled OEM programs.
For custom drawings, application reviews, or sample requests, contact the XIAYI engineering team with your dimensional and operating requirements.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2006
Total Annual:
1500000-5000000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Founded in 2006 and headquartered in the strategic port city of Ningbo, China, XIAYI is a premier high-tech manufacturer specializing in the research, development, and production of precision shock absorber components and automated assembly equipment. With nearly two decades of indust... Founded in 2006 and headquartered in the strategic port city of Ningbo, China, XIAYI is a premier high-tech manufacturer specializing in the research, development, and production of precision shock absorber components and automated assembly equipment. With nearly two decades of indust...
