MG-2Y WC thrust washer is a lead-free boundary lubricated thrust washer manufactured with a low-carbon steel backing, a sintered porous bronze powder interlayer, and a POM (polyoxymethylene) fiber-filled polymer surface. This bimetal composite design provides high load capacity, good wear resistance, and low friction. The thrust washer is suitable for axial load applications under low-speed, high-load conditions with rotating, oscillating, or reciprocating movements. The POM surface features lubrication indents that retain grease, allowing the bearing to operate for extended periods without external oiling. MG-2Y WC thrust washers are widely used in metallurgy machinery, mining machinery, water conservancy machinery, automobile industry, building machinery, agriculture machinery, and rolling steel industry applications where lead is unacceptable.[reference:0][reference:1]
◆ Material Structure
MG-2Y WC thrust washers consist of four distinct layers:
1. POM with fiber – 0.3~0.5mm. Polyoxymethylene filled with fiber reinforcement provides low friction, high stiffness, and excellent wear resistance. The POM layer acts as the bearing's sliding surface.[reference:2]
2. Porous bronze powder – 0.2~0.35mm. Sintered spherical bronze layer creates a strong mechanical bond to the steel backing and acts as a reservoir for the POM polymer.[reference:3]
3. Steel backing – 0.4~2.2mm. Low-carbon steel strip provides high mechanical strength and structural integrity for press-fit installation.[reference:4]
4. Plated coating – Tin plating 0.005mm or copper plating 0.008mm for corrosion resistance.[reference:5]
Optional: PTFE lubricant overlay – Some versions include a thin PTFE-based overlay on the POM surface for an even lower initial friction coefficient and smoother run-in.[reference:6]
◆ Core Features
● Lead-Free Construction – MG-2Y WC thrust washers contain no lead, making them suitable for environmental compliance (RoHS) and applications where lead is unacceptable.[reference:7]
● Good Load Capacity and Anti-Wear – Designed for high load capacities and low speed with rotating, oscillating, or frequent stop-start motion.[reference:8]
● Extended Operation Without Relubrication – Can work for a long time without oil under boundary lubrication conditions when pre-lubricated with lubrication indents design. Periodic oil or grease lubrication will extend the working life span.[reference:9]
● Machinable POM Surface – The thicker POM layer allows for post-processing adjustment to achieve precise dimensions after installation.[reference:10]
● Wide Application Range – Suitable for auto chassis, forging machines, metallurgicals, civil engineering, power stations, and strip rolling industries.[reference:11]
◆ Operating Parameters (Technical Data)
| Technical Data – MG-2Y WC Thrust Washer | |
| Max. static load | 250 N/mm² |
| Max. load (very low speed) | 140 N/mm² |
| Max. load (rotating / oscillating) | 70 N/mm² |
| Max. PV (dry running) | 3 N/mm²·m/s |
| Temperature range | -40°C to +110°C |
| Friction coefficient | 0.05 ~ 0.20 |
| Max. speed (grease lubrication) | 2 m/s |
| Max. speed (oil lubrication) | >2 m/s |
| Thermal conductivity | 50 W/(m·K) |
| Coefficient of thermal expansion | 11 × 10⁻⁶ /K |
◆ Standard Dimensions (Inch Series)
MG-2Y WC thrust washers are available in standard inch sizes. The following table lists typical dimensions for reference.
| Model | Inner Diameter (in) | Outer Diameter (in) | Thickness s (in) |
|---|---|---|---|
| MG20 | 1.375 ~ 1.385 | 2.24 ~ 2.25 | 0.0625 ~ 0.0660 |
Note: Custom sizes are available upon request. For additional dimensions not listed, please consult the manufacturer.
◆ Dimensional Tolerance Guide
MG-2Y WC thrust washers conform to ISO 3547 standard specifications for wrapped plain bearings. The following tolerance data is provided for reference.
| Parameter | Tolerance |
|---|---|
| Inner diameter (Di) | +0.25 mm |
| Outer diameter (Do) | -0.25 mm |
| Thickness (St) | -0.05 mm |
| Groove depth (Ha) | ±0.2 mm |
| Groove diameter (Hd) | +0.12 mm |
| Locating hole center (dp) | ±0.125 mm |
◆ Installation and Fit Recommendations
For optimal performance and extended service life, the following guidelines should be observed:
● Initial Pre-Lubrication – Initial pre-lubrication at assembly is strongly recommended. Lubrication grease must be fully applied into the lubrication indents to form a protective film.[reference:12]
● Periodic Maintenance – While MG-2Y can work for a long time without oil under boundary lubrication conditions, periodic oil or grease lubrication will extend the working life span.[reference:13]
● Machining Allowance – The thicker POM layer is machinable, allowing for post-processing adjustment to achieve precise dimensions after installation.[reference:14]
● Mating Shaft Requirements – The mating shaft should have sufficient hardness and appropriate surface roughness (typically Ra ≤ 0.4 µm) for optimal performance and minimal wear.
◆ Application Areas
MG-2Y WC thrust washers are widely used in applications requiring high load capacity and low speed with thrust load conditions. Typical industries include:
● Metallurgy machinery and steel rolling industry[reference:15]
● Mining machinery and construction equipment[reference:16]
● Water conservancy machinery and hydropower equipment[reference:17]
● Automobile chassis and automotive components – widely used in machines where lead is unacceptable[reference:18][reference:19]
● Building machinery and construction equipment[reference:20]
● Agriculture machinery and heavy machinery[reference:21]
● Forging machines, power stations, and civil engineering applications[reference:22]
◆ Available Forms
MG-2Y WC thrust washers are available in various configurations:
● Standard metric and inch sizes
● Custom sizes per customer specification
● Custom groove patterns and lubrication indents
● Thrust washers with or without locating holes
