NBR EM Piston Rod Seals and Dust Covers for SDA Pneumatic Cylinders
Designed for EM type piston rods of SDA compact cylinders, combining rod sealing and dust cover protection in one part.
It effectively blocks dust and contaminants from entering the cylinder body and helps maintain stable pneumatic sealing performance.
Made of NBR nitrile rubber, it offers oil resistance and wear resistance for common pneumatic lubrication conditions.
Combined with the FC air seal structure, it helps improve dust protection and sealing performance, making it suitable for the front cover of compact cylinders.
The NBR Piston EM Rod Rubber Seal and Dust Cover for SDA Pneumatic Cylinders is designed to provide reliable rod sealing and effective dust protection for pneumatic equipment.
Made from NBR (nitrile rubber, Buna-N seals), this sealing component offers good oil resistance, wear resistance, and sealing performance under suitable operating conditions. It helps reduce air leakage along the piston rod while preventing dust and contaminants from entering the sealing area.
Suitable for compatible SDA compact pneumatic cylinders, this product is available in various sizes and specifications to meet equipment maintenance, replacement, and OEM customization requirements.
Quad Ring Seal Technical Specifications
Item
Specification
Product Name
EM Type Piston Rod Seal
Material
NBR (Nitrile Rubber,Buna-N)
Color
Black and customized
Application
Dust-proof sealing
Processing Method
Compression molding
Sealing Medium
Gas
Surface Speed
≤1 m/s
Working Temperature
-20°C ~ +80°C
Surface Treatment
Cleaning & Deburring
Size
ID:4mm/6/8/10/12/16/20/25 OD:7/9/11.5/14/16.5/18.5/20.5/22.5/27/32 CS:2.8/3.2/3.7/4/4.6/5.4 Size custom available
Features
Waterproof, dustproof, high temperature resistant, low temperature resistant
EM Type Piston Rod Seal Dimension
Accurate measurements ensure a proper fit for EM piston rod seals and dust covers used in SDA pneumatic cylinders. Please provide the inner diameter (ID), outer diameter (OD), and thickness (T).
Custom sizes are available based on drawings, samples, or specific requirements.
Three Materials for Piston Rod Seals
1. NBR (Nitrile Butadiene Rubber)
NBR offers good oil resistance, wear resistance, and elasticity.
It is suitable for general pneumatic piston rod sealing and dust protection applications, providing a cost-effective solution for everyday industrial use.
2. FKM (Fluoroelastomer)
FKM provides excellent heat resistance and resistance to many oils, fuels, and chemicals.
It is suitable for piston rod sealing applications involving elevated temperatures or demanding operating conditions. Compatibility depends on the specific media and compound.
3. HNBR (Hydrogenated Nitrile Butadiene Rubber)
HNBR combines good oil resistance, heat resistance, and wear resistance with improved aging resistance compared with standard NBR.
It is suitable for piston rod sealing applications requiring enhanced durability and mechanical performance.
EM Rod Seals Feature
NBR Nitrile Rubber – High Elasticity & Fine Workmanship
Made from quality NBR nitrile rubber, these seals offer good elasticity, oil resistance, and sealing performance. Manufactured using professional production equipment and integrated molding technology, they deliver consistent quality, precise workmanship, and reliable sealing for industrial applications.
Precision Manufacturing & Strict Quality Control
Manufactured using advanced molds and integrated molding technology, our seals feature precise dimensions and tight tolerances. With a smooth, burr-free surface and consistent dimensional accuracy, they are designed to meet demanding sealing requirements.
Reliable Sealing for Harsh Conditions
Designed for demanding working environments, these seals offer good oil resistance, wear resistance, and heat resistance. They help minimize leakage and maintain stable sealing performance under harsh operating conditions, including oil exposure.
Product Design & Application
EM-type piston seals are installed inside air cylinders to provide bore sealing during reciprocating motion. Designed for reliable sealing performance, they help support the stable operation of pneumatic equipment.
Ample Stock & Fast Delivery
Regular products are well stocked and ready for quick dispatch. We process orders efficiently to help reduce lead times and meet urgent purchasing and routine replenishment needs.
Packing /Payment/Shipping service
Package:We provide standard cartons, pallets and wooden cases. Custom packaging is available upon request to protect goods well for different shipments.
Payment Methods:Multi-currency settlement (CNY, USD, EUR, etc.). Multiple payment options including T/T, PayPal. Local bank transfer is available for some countries for faster transactions.
Delivery Method:We offer international express, air freight, sea freight and railway transport. You can also appoint your own forwarder for flexible delivery arrangements.
OEM and ODM Service
Jinnai Seal provides customized rubber sealing solutions tailored to diverse industrial needs. Our customization services cover rubber materials, dimensions, shapes and designs, colors, hardness, surface finishes, mold development, and packaging. We support both standard specifications and custom manufacturing based on your drawings, samples, and application requirements, delivering flexible and reliable sealing products for a wide range of industries.
Why Choose Jinnai Seal?
Factory Advantages
R&D Strength Focus on R&D and manufacturing of rubber seals for 20 years.
Vulcanization Workshop 200+ advanced equipment, integrated molding & mass production.
Mold Workshop Accurate dimension, consistent quality, fast delivery.
Product Advantages
Finished Goods Warehouse 3000+ O-ring specifications available for same-day shipment.
Customized Products Non-standard mold design, professional R&D team, 100% inspection before delivery,
Jinnai Seal specializes in manufacturing a wide range of sealing products, including bonded seals, rubber O rings, custom rubber seals, rubber balls, gaskets and washers, and oil seals. We offer various materials, sizes, colors, and hardness options to meet diverse industrial requirements. With flexible customization and a focus on product quality, we provide reliable sealing solutions for automotive systems, hydraulic and pneumatic equipment, pumps, valves, chemical processing, and general industrial applications. Standard sizes and customized products are available to meet your specific needs.
FAQs
What are the advantages of NBR rubber rod seals for pneumatic cylinders?
NBR rubber seals offer good oil resistance, wear resistance, and sealing performance. They are suitable for many pneumatic cylinder applications where resistance to lubricating oils and mechanical durability are required.
What is the function of an EM rod seal and dust cover in an SDA pneumatic cylinder?
The rod seal helps prevent compressed air leakage along the piston rod, while the dust cover helps keep dust, dirt, and other contaminants away from the sealing area. Their functions depend on the specific seal design and installation position.
Is this NBR EM rod seal compatible with all SDA compact cylinders?
Not necessarily. Compatibility depends on the cylinder model, rod diameter, groove dimensions, and seal profile. Please confirm the original part number or provide technical drawings and dimensions before ordering.
Can NBR rod seals be used in pneumatic equipment exposed to oil and grease?
Yes. NBR is commonly used in pneumatic and industrial equipment because of its good resistance to many mineral oils and greases. However, compatibility depends on the specific lubricant, temperature, and operating conditions.
Can custom NBR rod seals and dust covers be manufactured for OEM pneumatic cylinders?
Yes. Custom NBR rod seals and dust covers can be produced according to drawings, samples, or specified dimensions. Material hardness, seal profile, size, and application requirements can be evaluated to support OEM production and replacement needs.
How do I know it is time to replace the EM seal rather than adjusting the cylinder or the air supply?
The EM seal should be replaced when three conditions are confirmed. First, the cylinder leaks at the rod end during the stroke or at rest, but the leakage stops or changes character when the rod is held at a different extension — this points to a worn rod seal rather than a leaking fitting or end-cap O-ring. Second, the rod feels “sticky” or the cylinder motion is hesitant at low speed, which often indicates the dust lip has hardened and is dragging on the rod rather than wiping it cleanly. Third, visible deformation or flattening of the seal cross-section upon inspection — a rod seal that has taken a permanent set or shows a glazed, hardened surface has lost its elastic recovery and will continue to leak even if re-greased. If the cylinder shows leakage but the seal still looks pliable and uniformly worn, check the rod surface for scratches and the mounting surface for flatness before replacing the seal; fitting a new seal onto a scored rod or a distorted bore will simply reproduce the same failure.
