3.5 mm Cross Section Polyurethane O-Rings

Due to the wide range of sizes, colors are shipped at random based on available stock. Available colors include red, natural, translucent, black, blue, green, and yellow. If you have any questions or color preferences, please contact the seller before placing your order.

Product Overview

Polyurethane O-Rings with a 3.5 mm cross section are designed for industrial sealing applications requiring excellent wear resistance, high mechanical strength and long-term sealing reliability.

Made from high-quality polyurethane (PU), these O-rings provide superior abrasion resistance, tear strength and extrusion resistance compared with conventional rubber sealing materials. They are suitable for both static and dynamic sealing applications, including hydraulic, pneumatic and mechanical systems.

Size Selection

Select size by:

Inside Diameter (ID) × Cross Section (CS)

Example:

(OD = ID + 2 × CS)

Key Features

• 3.5 mm cross section for medium-duty industrial sealing applications
• Excellent wear and abrasion resistance
• High tensile strength and tear resistance
• Strong resistance to extrusion and deformation
• Suitable for dynamic reciprocating sealing
• Long service life under repeated movement and pressure
• Available in standard and custom sizes

Specifications

• Material: Polyurethane (PU)
• Cross Section: 3.5 mm
• Hardness: 70A / 80A / 90A / 95A (optional)
• Color: Red, Natural, Translucent, Black, Bue, Green or Custom
• Working Temperature: -40°C to +90°C (depending on grade)
• Application: Dynamic and static sealing

Applications

3.5 mm cross section polyurethane O-rings are commonly used in:

• Hydraulic cylinders
• Pneumatic actuators
• Industrial machinery
• Automotive systems
• Pumps and valves
• Construction equipment
• Automation equipment

Why Choose Polyurethane O-Rings?

Compared with NBR and silicone O-rings, polyurethane provides:

• Better abrasion resistance than NBR and standard rubber
• Higher mechanical strength
• Improved extrusion resistance
• Longer service life in dynamic applications

Related Sizes

Looking for another cross section?

• 1 mm Cross Section Polyurethane O-Rings
• 1.5 mm Cross Section Polyurethane O-Rings
• 1.78 mm Cross Section Polyurethane O-Rings
• 1.8 mm Cross Section Polyurethane O-Rings
• 1.9 mm Cross Section Polyurethane O-Rings
• 2 mm Cross Section Polyurethane O-Rings
• 2.4 mm Cross Section Polyurethane O-Rings
• 2.5 mm Cross Section Polyurethane O-Rings
• 2.65 mm Cross Section Polyurethane O-Rings
• 3.1 mm Cross Section Polyurethane O-Rings
• 4 mm Cross Section Polyurethane O-Rings