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Low Friction DU Bushing for Smooth Shock Absorber Rod Movement
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Low Friction DU Bushing for Smooth Shock Absorber Rod Movement
  • name
  • name
  • name

Low Friction DU Bushing for Smooth Shock Absorber Rod Movement

MOQ: 500pcs
Price: negotiation
Standard Packaging: Standard export packing or as customer's requirement
Delivery Period: Sample Generally 10 Days And Mass Cargo According To Quantity
Payment Method: T/T
Supply Capacity: 50,000pcs per month
Detail Information
Product Description
Detail Information
Place of Origin
Ningbo, China
Brand Name
XIAYI
Certification
IATF16949:2016
Model Number
SJ-3
Product Name:
Bushing
Inner Layer:
PTFE
Application:
Car Shock Absorber
Technical:
Cast, Coat, Sintered, Powder, Wrap
Accuracy Of Grinding:
+/-0.005mm
Backing Material:
Carbon Steel, Stainless Steel
Concentricity:
0.003mm
Finish:
Bronze-plating Or Tin-plating
Product Description
Low Friction DU Bushing for Smooth Shock Absorber Rod Movement

Model SJ-3 | Brand XIAYI | Certification IATF16949:2016

Engineered specifically for automotive shock absorber rod guide applications, the SJ-3 DU bushing combines a PTFE-based sliding surface with precision-ground dimensions to deliver exceptionally smooth rod movement with minimal stick-slip. With concentricity controlled to 0.003mm and grinding accuracy of ±0.005mm, every bushing meets the exacting requirements of modern hydraulic damper assemblies.

Precision Specifications
ParameterSpecification
ModelSJ-3
Accuracy of Machining±0.01 mm
Accuracy of Grinding±0.005 mm
Surface RoughnessRa 0.8
Parallelism±0.005 mm
Verticality±0.005 mm
Concentricity0.003 mm
Backing MaterialCarbon Steel / Stainless Steel (optional)
Inner LayerPTFE + Fibre Compound
InterlayerSintered Bronze Powder (0.20-0.35 mm)
Surface PlatingBronze-Plating or Tin-Plating
Product Description

The SJ-3 DU bushing utilizes a proven three-layer composite architecture that has become the industry standard for maintenance-free plain bearings in automotive suspension systems:

  • Layer 1: PTFE/fibre compound running surface (0.01-0.03 mm) that generates a self-lubricating transfer film during initial operation, effectively coating the mating shock absorber rod surface.
  • Layer 2: Sintered porous bronze interlayer (0.20-0.35 mm) providing maximum thermal conductivity away from the bearing surface while serving as a secondary lubricant reservoir.
  • Layer 3: Low-carbon steel backing delivering exceptionally high load carrying capacity and heat dissipation, with copper or tin plating for corrosion resistance.

This construction makes the SJ-3 suitable for dry-running conditions with low coefficient of friction, minimal wear rate, and excellent sliding characteristics — essential for the millions of compression-rebound cycles a shock absorber bushing must endure.

  • Rotary & Oscillating Motion: Optimized for the small-amplitude, high-frequency movements typical of damper rod guidance.
  • Chemical Resistance: Low water absorption and reduced swelling ensure dimensional stability in oil-filled damper environments.
  • Lubrication Compatible: Also performs well with lubrication for applications where additional oil supply is available.
Shock Absorber Application Challenges Addressed
"Our current bushings develop stick-slip after 15,000 km, causing an audible knocking sensation through the steering."
SJ-3's PTFE transfer film ensures consistent ultra-low friction from the very first stroke. With surface roughness controlled to Ra 0.8 and concentricity to 0.003 mm, the bushing eliminates the microscopic surface irregularities that initiate stick-slip behavior in lower-grade bushings.
"We see bushing-to-rod clearance variation of up to 0.02 mm between batches, forcing us to sort before assembly."
XIAYI maintains grinding accuracy of ±0.005 mm with statistical process control on every production batch. This consistency means your assembly line can run without incoming sorting, reducing labor cost and production bottlenecks.
"Standard bronze bushings require oil impregnation that degrades over time, leading to increased friction in high-mileage vehicles."
The SJ-3's PTFE surface is inherently self-lubricating — it does not depend on oil impregnation that can deplete. The transfer film mechanism provides consistent friction performance from day one through the entire vehicle lifespan, independent of oil retention.
"Corrosion from road salt and moisture causes bushing backing rust that migrates into the damper oil."
SJ-3 bushings feature copper or tin plating on the steel backing (0.002 mm uniform coating), creating an effective barrier against corrosion even in winter road salt conditions. Stainless steel backing is also available for extreme corrosion environments.
Material & Process Technology

Cast Coat Sinter Powder Metallurgy Wrap Forming CNC Finish Grinding Plating

The manufacturing sequence begins with precision strip steel preparation, followed by bronze powder sintering onto the steel surface. PTFE compound is then rolled and bonded into the porous bronze layer under controlled pressure and temperature. Final machining achieves the specified dimensional tolerances before plating and inspection.

Frequently Asked Questions
Q: What is the minimum order quantity for SJ-3 bushings?
Standard MOQ is 500 pieces. Sample quantities for testing and validation are available with shorter lead times. Contact our team with your specifications.
Q: Can you produce SJ-3 bushings to custom shock absorber specifications?
Absolutely. We offer full customization of all dimensions (ID, OD, length, flange if required), material options (carbon steel or stainless steel backing), and plating type (copper, tin, or custom). Share your drawing for a technical review and quotation.
Q: Do you provide PPAP documentation for automotive supply chain qualification?
Yes. As an IATF16949:2016 certified manufacturer, we provide full PPAP Level 3 documentation including dimensional reports, material certificates, process capability studies (Cpk), and control plans. This supports both OEM and Tier-1 supplier requirements.
Q: What is the typical lead time for production orders?
Sample orders typically ship within 10 days. Mass production lead time varies by order quantity — standard volumes ship within 2-3 weeks. Monthly capacity exceeds 50,000 pieces for the SJ-3 platform.
Q: How do SJ-3 bushings perform in oil-filled shock absorber environments?
The PTFE surface is chemically stable in hydraulic oils and maintains its self-lubricating properties even when continuously submerged. The bushing actually benefits from oil presence, achieving even lower friction coefficients than in dry conditions.
Q: What packaging do you use to protect precision-ground surfaces during shipping?
Bushings are individually separated with protective dividers in compartmentalized cartons, then packed into reinforced wooden cases for sea freight. This prevents surface-to-surface contact that could compromise the precision-ground finish.
Tags: 

sintered bronze bush,  

oilless bushing,  

shock absorber bushes

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Products
PRODUCTS DETAILS
Products

Shock Absorber Parts

Shock Absorber Piston

Banded Piston

Shock Absorber Mounting

Shock Absorber Guide

Shock Base Valve

Shock Oil Seal

Shock Valve Shims

Shock Absorber Bracket

Shock Absorber Piston Rod

Shock Piston Machine

Du Bushing

PTFE Bands

PTFE Ring Gasket

PTFE Parts

Guide Ring
Low Friction DU Bushing for Smooth Shock Absorber Rod Movement
  • name
  • name
  • name
Low Friction DU Bushing for Smooth Shock Absorber Rod Movement
MOQ: 500pcs
Price: negotiation
Standard Packaging: Standard export packing or as customer's requirement
Delivery Period: Sample Generally 10 Days And Mass Cargo According To Quantity
Payment Method: T/T
Supply Capacity: 50,000pcs per month
Detail Information
Product Description
Detail Information
Place of Origin
Ningbo, China
Brand Name
XIAYI
Certification
IATF16949:2016
Model Number
SJ-3
Product Name:
Bushing
Inner Layer:
PTFE
Application:
Car Shock Absorber
Technical:
Cast, Coat, Sintered, Powder, Wrap
Accuracy Of Grinding:
+/-0.005mm
Backing Material:
Carbon Steel, Stainless Steel
Concentricity:
0.003mm
Finish:
Bronze-plating Or Tin-plating
Minimum Order Quantity:
500pcs
Price:
negotiation
Packaging Details:
Standard export packing or as customer's requirement
Delivery Time:
Sample Generally 10 Days And Mass Cargo According To Quantity
Payment Terms:
T/T
Supply Ability:
50,000pcs per month
Product Description
Low Friction DU Bushing for Smooth Shock Absorber Rod Movement

Model SJ-3 | Brand XIAYI | Certification IATF16949:2016

Engineered specifically for automotive shock absorber rod guide applications, the SJ-3 DU bushing combines a PTFE-based sliding surface with precision-ground dimensions to deliver exceptionally smooth rod movement with minimal stick-slip. With concentricity controlled to 0.003mm and grinding accuracy of ±0.005mm, every bushing meets the exacting requirements of modern hydraulic damper assemblies.

Precision Specifications
ParameterSpecification
ModelSJ-3
Accuracy of Machining±0.01 mm
Accuracy of Grinding±0.005 mm
Surface RoughnessRa 0.8
Parallelism±0.005 mm
Verticality±0.005 mm
Concentricity0.003 mm
Backing MaterialCarbon Steel / Stainless Steel (optional)
Inner LayerPTFE + Fibre Compound
InterlayerSintered Bronze Powder (0.20-0.35 mm)
Surface PlatingBronze-Plating or Tin-Plating
Product Description

The SJ-3 DU bushing utilizes a proven three-layer composite architecture that has become the industry standard for maintenance-free plain bearings in automotive suspension systems:

  • Layer 1: PTFE/fibre compound running surface (0.01-0.03 mm) that generates a self-lubricating transfer film during initial operation, effectively coating the mating shock absorber rod surface.
  • Layer 2: Sintered porous bronze interlayer (0.20-0.35 mm) providing maximum thermal conductivity away from the bearing surface while serving as a secondary lubricant reservoir.
  • Layer 3: Low-carbon steel backing delivering exceptionally high load carrying capacity and heat dissipation, with copper or tin plating for corrosion resistance.

This construction makes the SJ-3 suitable for dry-running conditions with low coefficient of friction, minimal wear rate, and excellent sliding characteristics — essential for the millions of compression-rebound cycles a shock absorber bushing must endure.

  • Rotary & Oscillating Motion: Optimized for the small-amplitude, high-frequency movements typical of damper rod guidance.
  • Chemical Resistance: Low water absorption and reduced swelling ensure dimensional stability in oil-filled damper environments.
  • Lubrication Compatible: Also performs well with lubrication for applications where additional oil supply is available.
Shock Absorber Application Challenges Addressed
"Our current bushings develop stick-slip after 15,000 km, causing an audible knocking sensation through the steering."
SJ-3's PTFE transfer film ensures consistent ultra-low friction from the very first stroke. With surface roughness controlled to Ra 0.8 and concentricity to 0.003 mm, the bushing eliminates the microscopic surface irregularities that initiate stick-slip behavior in lower-grade bushings.
"We see bushing-to-rod clearance variation of up to 0.02 mm between batches, forcing us to sort before assembly."
XIAYI maintains grinding accuracy of ±0.005 mm with statistical process control on every production batch. This consistency means your assembly line can run without incoming sorting, reducing labor cost and production bottlenecks.
"Standard bronze bushings require oil impregnation that degrades over time, leading to increased friction in high-mileage vehicles."
The SJ-3's PTFE surface is inherently self-lubricating — it does not depend on oil impregnation that can deplete. The transfer film mechanism provides consistent friction performance from day one through the entire vehicle lifespan, independent of oil retention.
"Corrosion from road salt and moisture causes bushing backing rust that migrates into the damper oil."
SJ-3 bushings feature copper or tin plating on the steel backing (0.002 mm uniform coating), creating an effective barrier against corrosion even in winter road salt conditions. Stainless steel backing is also available for extreme corrosion environments.
Material & Process Technology

Cast Coat Sinter Powder Metallurgy Wrap Forming CNC Finish Grinding Plating

The manufacturing sequence begins with precision strip steel preparation, followed by bronze powder sintering onto the steel surface. PTFE compound is then rolled and bonded into the porous bronze layer under controlled pressure and temperature. Final machining achieves the specified dimensional tolerances before plating and inspection.

Frequently Asked Questions
Q: What is the minimum order quantity for SJ-3 bushings?
Standard MOQ is 500 pieces. Sample quantities for testing and validation are available with shorter lead times. Contact our team with your specifications.
Q: Can you produce SJ-3 bushings to custom shock absorber specifications?
Absolutely. We offer full customization of all dimensions (ID, OD, length, flange if required), material options (carbon steel or stainless steel backing), and plating type (copper, tin, or custom). Share your drawing for a technical review and quotation.
Q: Do you provide PPAP documentation for automotive supply chain qualification?
Yes. As an IATF16949:2016 certified manufacturer, we provide full PPAP Level 3 documentation including dimensional reports, material certificates, process capability studies (Cpk), and control plans. This supports both OEM and Tier-1 supplier requirements.
Q: What is the typical lead time for production orders?
Sample orders typically ship within 10 days. Mass production lead time varies by order quantity — standard volumes ship within 2-3 weeks. Monthly capacity exceeds 50,000 pieces for the SJ-3 platform.
Q: How do SJ-3 bushings perform in oil-filled shock absorber environments?
The PTFE surface is chemically stable in hydraulic oils and maintains its self-lubricating properties even when continuously submerged. The bushing actually benefits from oil presence, achieving even lower friction coefficients than in dry conditions.
Q: What packaging do you use to protect precision-ground surfaces during shipping?
Bushings are individually separated with protective dividers in compartmentalized cartons, then packed into reinforced wooden cases for sea freight. This prevents surface-to-surface contact that could compromise the precision-ground finish.
Tags: 

sintered bronze bush,

oilless bushing,

shock absorber bushes

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