Name: Wear Resistant DU Bushing with Stable Guide Performance
Brand: XIAYI
Price: 1 USD

Product Details
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Wear Resistant DU Bushing with Stable Guide Performance

Model DP-4 | Brand XIAYI | Certification IATF16949:2016

The DP-4 DU bushing features a tri-layer composite structure — low-carbon steel backing, sintered bronze interlayer, and a PTFE-based anti-friction running surface. Designed for heavy-load, maintenance-free applications, this self-lubricating bushing eliminates the need for external grease or oil systems while delivering consistent low-friction performance from -195oC to +280oC.

Structure & Material Composition

Layer	Material	Function
Surface Layer (0.01-0.03mm)	PTFE + Fibre Compound	Self-lubricating anti-friction surface, forms protective transfer film on mating shaft
Interlayer (0.20-0.35mm)	Sintered Porous Bronze	Thermal conductor, lubricant reservoir, mechanical bond between steel and PTFE
Backing	Low-Carbon Steel	High load capacity, dimensional stability, heat dissipation
Plating	Copper / Tin (0.002mm)	Corrosion protection for steel backing

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

Key Advantages

Maintenance-Free Operation: PTFE surface layer eliminates the need for periodic grease or oil lubrication, reducing total cost of ownership in hard-to-access installations.
Wide Temperature Range: Functional from cryogenic (-195oC) to high-temperature (+280oC) environments, suitable for both freezer equipment and heated industrial processes.
Self-Lubricating Transfer Film: During initial run-in, a microscopic PTFE film transfers to the mating shaft surface, creating a low-friction interface that protects both components from wear.
Thin-Wall Design: Compact cross-section reduces housing size and weight compared to traditional bronze bushings, supporting equipment miniaturization.
Low Noise Operation: The polymer-based running surface absorbs vibration and eliminates metal-on-metal contact noise.

Real-World Engineering Challenges & DP-4 Solutions

"Our cement conveyor bushings fail every 3 months due to abrasive dust ingress and lack of lubrication access."

The DP-4's PTFE surface operates without external lubrication and forms a self-renewing transfer film. Its sintered bronze interlayer acts as a secondary lubricant reservoir, providing a built-in safety margin even when surface abrasion occurs.

"The heat from continuous casting machines causes standard bushings to seize after a few production cycles."

With an upper operating limit of 280oC, the DP-4 maintains dimensional stability and friction performance well above the thermal threshold of greased bronze bushings. The steel backing efficiently conducts heat away from the friction interface.

"We need bushings that work in food-grade environments where external lubricants are prohibited."

DP-4 bushings operate completely dry with no external lubrication required. The PTFE compound is chemically inert and does not contaminate product contact surfaces, making it suitable for food processing, pharmaceutical, and clean-room equipment.

"High static loads during machine startup cause brinelling damage to conventional bearings."

The DP-4's composite structure handles static loads up to 250 N/mm² without permanent deformation. The steel backing provides the compressive strength to resist brinelling, while the PTFE layer ensures immediate low-friction sliding as soon as movement begins.

Manufacturing Capability

Processing Equipment

CNC Machining Center CNC Turning CNC Milling 4-Axis Machine CNC Drilling Auto Lathe

Surface Finishing

Anodizing Powder Coating Zinc Plating Copper Plating Tin Plating Laser Engraving

Application Industries

Steel metallurgy — continuous casting machine roller grooves, mill guides
Cement & construction — grout pumps, screw conveyors, mixing equipment
Heavy vehicles — suspension pivot points, kingpin bushings, spring shackles
Agricultural machinery — harvester linkages, tiller pivot assemblies
Industrial automation — robotic arm joints, conveyor roller bearings
Marine & offshore — deck equipment, hatch cover rollers, mooring systems

Frequently Asked Questions

Q: What is the minimum order quantity for DP-4 bushings?

Standard MOQ is 500 pieces. For prototype or sample evaluation, smaller quantities are available. Please contact our sales team with your dimensional requirements.

Q: Can you supply DP-4 bushings in custom dimensions?

Yes. XIAYI offers full customization of inner diameter, outer diameter, length, and flange dimensions. Thrust washers in custom sizes are also available. Provide your technical drawing for a feasibility assessment and quotation.

Q: What plating options are available for corrosion protection?

Standard options include copper plating, tin plating, and zinc plating. For marine or highly corrosive environments, we can discuss specialized coatings. Contact our engineering team with your environmental requirements.

Q: How do DP-4 bushings compare to traditional bronze bushings in terms of service life?

In dry-running or marginally lubricated applications, DP-4 bushings typically outlast bronze bushings by 3-10 times due to the PTFE self-lubrication mechanism. The transfer film continuously protects both the bushing and the mating shaft, whereas bronze relies on external lubrication that degrades over time.

Q: What is the delivery time for standard orders?

Standard delivery is approximately 2 weeks from payment receipt. Production capacity exceeds 50,000 pieces per month, ensuring reliable supply for volume orders.

Q: Can the DP-4 be used in submerged or wet environments?

Yes. The PTFE surface is hydrophobic and chemically stable in water, mild acids, and alkalis. For fully submerged applications, we recommend tin-plated backing for enhanced corrosion protection. The bushing performs equally well in wet conditions as in dry.

Wear Resistant DU Bushing with Stable Guide Performance

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Categories	Du Bushing
Model Number:	DP-4
Coating:	Spray PTFE
Price:	negotiation
Application:	Heavy vehicle
Surface:	cooper plating, zinc plating
MOQ:	500pcs
Delivery Time:	Two weeks after received your payment
Lubricating:	PTFE, POM, Graphite
Payment Terms:	T/T
Bush layer:	PTFE, PTFE, POM plastic, Tin, Zinc
Shape:	Cylinder, Thrust pad
Supply Ability:	50,000pcs per month
Product Name:	Bushing
Brand Name:	XIAYI
Standard:	DIN 1494
Certification:	IATF16949:2016
Place of Origin:	Ningbo, China
Packaging Details:	Wood case for every 8ctns / 12ctns / 16ctns for sea shipment