Strut Mount Bearings: Technical Specification & OEM Supply Guide
Strut mount bearings are fitted between the front suspension strut mount and the upper coil spring seat in MacPherson systems. Their core function is to support full vehicle body weight, absorb vertical road shock, and provide low-friction rotational guidance during steering movement.
Our strut mount bearings are designed for both OEM assembly line integration and high-durability aftermarket replacement. Built with glass-fiber reinforced housings, deep-groove precision steel raceways, and multi-lip labyrinth seals, they prevent steering binding, spring noise, and premature fatigue failure under heavy road impacts.
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![MacPherson Front Strut Bearing]()
MacPherson Front Strut BearingMacPherson front strut bearing is the core steering component of the front MacPherson suspension system. Installed at the top of the front shock absorber strut, it is a key hub for steering torqueread more -
![Strut Bearing For Shock Absorber]()
Strut Bearing For Shock AbsorberStrut bearing for shock absorber is a special bearing specially developed for shock absorber assembly supporting. It is precisely matched with the shock absorber piston rod and top rubber assembly,read more -
![Suspension Strut Bearing Kit]()
Suspension Strut Bearing KitSuspension strut bearing kit is a complete set of accessories specially built for suspension maintenance scenarios, including the bearing body and supporting seals, grease and other relatedread more -
![OE Replacement Strut Bearing]()
OE Replacement Strut BearingOE replacement strut bearing is a strut bearing replacement part developed strictly benchmarked against original OE standards. It completely replicates the size, performance and installationread more -
![Rear Suspension Top Mount Bearing]()
Rear Suspension Top Mount BearingRear suspension top mount bearing is the core load-bearing rotating component at the rear suspension tower top position. Installed between the top of the rear shock absorber and the vehicle bodyread more -
![Aftermarket Strut Top Bearing]()
Aftermarket Strut Top BearingAftermarket strut top bearing is a shock absorber tower top replacement bearing specially built for the automotive after-sales maintenance market, focusing on the combination of OE quality and highread more -
![Automotive Shock Strut Bearing]()
Automotive Shock Strut BearingAutomotive shock strut bearing is a general-purpose core component of automotive shock strut systems. It is widely used in various passenger vehicle models with MacPherson suspension, and is one ofread more -
![Strut Tower Mount Bearing]()
Strut Tower Mount BearingWith 20 years of manufacturing experience in automotive shock absorber bearings, our produced Strut tower mount bearing has a specially strengthened structure for the use needs of heavy-duty vehiclesread more -
![Upper Suspension Strut Bearing]()
Upper Suspension Strut BearingOur produced Upper suspension strut bearing is specially developed for various suspension assembly supporting, and can achieve micron-level precise fit with assembly components, effectively avoidingread more -
![Front Shock Absorber Bearing]()
Front Shock Absorber BearingFront shock absorber bearing is the core rotating component of the automotive front shock absorber system. Installed between the top of the front shock absorber piston rod and the suspension support,read more -
![Rear Strut Mount Bearing]()
Rear Strut Mount BearingRear strut mount bearing is a key rotating component connecting the rear suspension shock strut and the vehicle body. It mainly undertakes the axial load bearing and steering assistance function ofread more -
![MacPherson Suspension Strut Bearing]()
MacPherson Suspension Strut BearingMacPherson suspension strut bearing is the core precision component of the MacPherson independent suspension system. Installed at the connection between the top of the front shock absorber and theread more
Construction & Materials
Each bearing assembly combines engineered polymers and metallurgy selected to handle high combined axial and shock loads:
Housing / Cover
PA66 + 30% Glass Fiber (PA66-GF30). Provides structural rigidity, high fatigue strength, and heat resistance up to 120°C.
Raceway Rings
52100 Chrome Steel (100Cr6) or Cold-Rolled Carbon Steel. Through-hardened to HRC 58–62 to resist denting under extreme loads.
Rolling Elements
Grade 10 Chrome Steel Balls. Ensures accurate rotational geometry and low friction torque.
Retainer / Cage
PA66 or POM. Maintains constant ball spacing to lower operational wear and operating noise.
Seals
NBR Multi-Lip / Double Labyrinth Seals. Prevents water, mud, dust, and road salt ingress while retaining internal grease.
Lubrication
High-pressure (EP) Synthetic Polyurea or Lithium-Complex Grease. Stable operating temperature range from -40°C to +140°C.
Technical Specifications
|
Parameter |
Value / Range |
Standard / Test Method |
|
Axial Dynamic Load Rating (Ca) |
12.5 kN – 28.5 kN |
ISO 281 |
|
Axial Static Load Rating (C0a) |
22.0 kN – 55.0 kN |
ISO 281 |
|
Rotational Friction Torque |
≤ 0.35 N·m (under 3 kN axial load) |
Internal Bench Test |
|
Operating Temperature |
-40°C to +120°C (Continuous) |
ISO 16750-4 |
|
Radial Clearance / Play |
0.05 mm – 0.18 mm |
Dial Indicator Gauging |
|
Raceway Hardness |
HRC 58 – 62 |
ASTM E18 |
|
Surface Roughness (Ra) |
≤ 0.20 μm (Raceway) |
Contact Profilometer |
|
Corrosion Protection |
96h to 480h without red rust |
ISO 9227 / ASTM B117 |
Performance Attributes
The company conducted a competitive advantage analysis to identify its strengths and weaknesses compared to its rivals.
Steering Smoothness
Low rotational friction prevents coil spring memory steer and assists smooth steering wheel return.
Vibration Isolation
Reduces micro-vibrations transferred from rough road surfaces to the chassis body.
Environmental Sealing
Labyrinth sealing protects rolling channels against pressure washing, road salt spray, and abrasive grit.
Impact Strength
Retains structural stability during severe curb strikes and pothole shock without housing fracture.
OE Strut Assembly (Automated Production)
Pre-Load Alignment: Ensure exact axial alignment with the upper spring seat prior to tightening the shock absorber retaining nut.
Press Fitting: Apply pressing force only to the structural shoulder of the housing. Never transfer force through the internal rolling elements.
Torque Application: Fasten top mounting nuts strictly according to OEM torque requirements using calibrated nut runners.
Aftermarket Strut Replacement (Manual Repair)
Inspect the spring seat insulator, strut rod threads, and rubber mount condition before mounting the new bearing.
Never reuse distorted or corroded top retaining plates.
Align the upper coil end accurately within the lower housing channel to avoid uneven point-loading on the raceway.
Customization & OEM Capabilities
Dimensions & Profiles
Custom inner/outer diameters, stack height adjustment, and spring seat profile matching.
Material Engineering
Glass-fiber ratios from 20% to 40%, reinforced metal insert plates, or specialized dampening rubbers.
Sealing Options
Single-lip, double-lip, or full labyrinth multi-seal designs tailored for severe road conditions.
Branding & Packaging
Laser-etched part numbers, batch traceability codes, and private-label packaging boxes.
Our manufacturing facilities operate under IATF 16949 quality management standards.
Production Flow
Raw Material Inspection (Steel/PA66) → Precision Stamping & Plastic Injection → Heat Treatment (HRC 58-62) → Raceway Grinding & Super-Finishing → Automated Assembly & Grease Dosing → 100% Torque & Clearance Inspection → Packaging & Shipping
Quality Control Protocol
Material Testing: Spectrometer chemical analysis for steel batches and Melt Flow Index (MFI) verification for PA66 resin.
Dimensional Measurement: CMM (Coordinate Measuring Machine) verification for housing dimensions, runout, and raceway roundness.
Fatigue Endurance: Dynamic durability testing running up to 2,000,000 steering cycles under alternating axial loads (5 kN to 15 kN).
Environmental Testing: Thermal cycle testing (-40°C to +120°C) and neutral salt spray (NSS) testing.
Our Certificate
Packaging & Shipping
Individual Unit
Anti-rust sealed plastic bag inside a single neutral or branded box.
Master Carton
Double-wall corrugated cartons (maximum 20 kg per carton).
Pallet Packaging
ISPM 15 heat-treated wooden pallets, shrink-wrapped with corner guards.
Logistics Terms
FOB Ningbo / Shanghai, CIF, or DDP. Standard production lead time: 30–45 days after order approval.
As one of the leading strut mount bearing manufacturers and suppliers in China, we also support customized service with low price. We warmly welcome you to wholesale high quality strut mount bearing for sale here from our factory. If you have any enquiry about quotation, please feel free to email us.
strut mount bearing, Front Strut Mount Bearing, Strut Tower Bearing