Product Overview
Rubber Square Rings (also known as Washer Rings or Rectangular Seals) are high-precision sealing components with a square or rectangular cross-section. Unlike traditional O-rings, which have a circular profile, Square Rings provide a larger contact surface area, making them exceptionally stable in high-pressure static applications.
Designed to eliminate the risk of spiral failure and rolling, our Square Rings are the preferred choice for hydraulic flange seals, cap seals, and industrial valve assemblies. They offer a cost-effective alternative to O-rings while providing superior resistance to extrusion and permanent deformation under heavy loads.
Structure & Cross-Section
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The Precision "Flat-Face" SealThe defining characteristic of the Square Ring is its four-sided geometry. The flat surfaces create a uniform pressure distribution across the entire sealing face, which effectively handles high torque and vibration without losing integrity. This profile is particularly effective in grooves where a circular O-ring might be prone to "nibbling" or extrusion at the clearance gap. We provide die-cut Square Rings for thin-gauge gaskets and molded Rectangular Rings for heavy-duty industrial housings. Each ring is engineered to fit standard AS568 or metric grooves for seamless retrofitting. |
Material Selection
1. Standard & High-Performance Elastomers
| Material | Key Features | Typical Applications |
|---|---|---|
| NR (Natural Rubber) | High resilience, abrasion resistance | General automotive components |
| SBR (Styrene Butadiene) | Cost-effective, good wear resistance | Industrial gaskets, tires |
| NBR (Nitrile) | Superior oil and fuel resistance | Fuel systems, hydraulic lines |
| CR (Neoprene) | Excellent ozone and weather resistance | Outdoor seals, HVAC systems |
| EPDM | Outstanding steam and UV resistance | Plumbing, solar panels |
| EPDM (Peroxide-Cured) | Enhanced thermal stability | Steam handling, hot water systems |
| IIR (Butyl) | Very low gas permeability | Vacuum seals, gas containers |
| XNBR (Carboxylated NBR) | High abrasion and tear strength | Mining equipment, heavy machinery |
| PU (Polyurethane) | Highest mechanical strength | Hydraulic cylinder rod seals |
| HNBR (Hydrogenated NBR) | High temp and chemical durability | Oil & Gas exploration |
| ACM (Polyacrylate) | Resistance to hot transmission fluid | Automatic transmissions |
| VMQ (Silicone) | Wide temperature range, food safe | Medical devices, kitchens |
| FVMQ (Fluorosilicone) | Fuel resistance at low temperatures | Aerospace fuel seals |
| FKM (Viton) | High temperature & chemical stability | Chemical plants, aerospace |
| TPR (Thermoplastic) | Recyclable, easy processing | Soft-grip seals |
| PTFE (Teflon) | Universal chemical resistance | Lab equipment, aggressive fluids |
| FFKM (Perfluoroelastomer) | Ultimate chemical & heat resistance | Semiconductor manufacturing |
2. Special Compound Options
- ˚ ✵ Internally lubricated rubber compounds (Paraffin / PTFE / Silicone)
- ˚ ✵ Electrically conductive rubber compounds
- ˚ ✵ UL-approved rubber compounds
3. Surface Treatment Options
- ˚ ✵ Talc powder treatment
- ˚ ✵ Silicone oil treatment
- ˚ ✵ PTFE coating
- ˚ ✵ PSA (Self-adhesive) backing
Product Advantages
✬ * Why Choose Our Square Rings?
- Zero-Spiral Advantage – Square geometry eliminates the risk of twisting in high-friction grooves
- Superior Face Sealing – Provides more contact area for static applications than O-rings
- Extrusion Resistance – Flat edges resist being squeezed into clearance gaps under high pressure
- Cost Efficiency – Often more economical for large-scale production than complex Quad-rings
- Custom Molding – Available in precise thicknesses from 0.5mm to heavy-gauge industrial profiles
☾. ° Xiamen Best Seal Manufacturing Strength
- High-Speed Compression Molding – Efficient mass production for standard Square Rings
- Cryogenic Flash Removal – Ensures perfectly smooth sealing edges on every component
- Rapid Tooling Deployment – 7-10 day turnaround for custom sizing prototype molds
- 100% Quality Screening – Zero-defect policy using automated vision inspection systems
- Material Certification – Full traceability for automotive and medical grade compounds
Product Applications
High-Load Industrial SealingRubber Square Rings are the industry standard for high-pressure hydraulic cylinders and heavy machinery joints. Their resistance to spiral failure makes them superior to O-rings in long-stroke applications. They are also widely used in plumbing fittings and water meters, where the flat surface provides a more reliable seal against large flange faces and uneven casting surfaces. |
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Installation & Maintenance Guide
🛠️ Best Practices for Square Ring Installation
Ensure groove walls are perpendicular. Square rings rely on full contact with the flat bottom of the housing.
Apply a thin film of system-compatible lubricant to aid seating and prevent friction during initial assembly.
After insertion, visually inspect to ensure the ring is not slanted or pinched along its side edges.
For flange seals, tighten bolts in a star pattern to ensure even compression across the rectangular profile.
Packaging & Shipping
📦 Packaging Options
We provide flexible packaging solutions based on product size, order quantity, protection requirements, and customer preferences. Both standard and special packaging options are available to ensure safe delivery and convenient handling.
| Category | Packaging Type |
|---|---|
| Standard Packaging | Large Poly Bags (Bulk) |
| Small Poly Bags | |
| Foam / Bubble Protective Packaging | |
| Special Packaging | Blister Packaging |
| Inflatable Packaging | |
| Plastic Heat Shrink Packaging + Cardboard Reinforcement | |
| Sleeve Packaging (Protective Tube) | |
| Customization Available: Labels, part numbers, barcodes, batch info, or customer branding upon request | |
🚚 Shipping & Logistics
We offer multiple shipping methods with flexible delivery options to meet your project timelines.
| Item | Details |
|---|---|
| Shipping Methods | Express (DHL / FedEx / UPS), Air Freight, Sea Freight |
| Delivery Time | Express: 3–5 days | Air: 5–7 days | Sea: 25–35 days |
| Export Packing | Standard export cartons, palletized if required |
| Trade Terms | EXW, FOB, CIF, DDP available |
| Shipping Port | Xiamen, China |
| Custom / Tooling Orders | Orders requiring custom molds or special tooling |
💡Secure & Reliable Delivery :
All products are packed to prevent contamination, deformation, and surface damage, ensuring they arrive in optimal condition for immediate use or assembly.
Certificates & Compliance
🏆 Global Standards: ISO 9001:2015, WRAS, NSF 61, FDA, RoHS 2.0, REACH
⚙️ Quality Testing: Shore Hardness (ASTM D2240), Tensile Life, Chemical Immersion Testing
🧪 Zero-Defect Commitment:
Every shipment of Square Rings is accompanied by a material certificate and dimensional report, ensuring full compliance with your critical aerospace or industrial project specifications.
FAQ – Technical Support
❓ Can Square Rings be used in O-ring grooves?
Yes. Square rings are specifically designed to be interchangeable with O-rings (following AS568 standards). They provide a direct upgrade for applications where O-rings fail due to spiraling.
❓ What is the main advantage over O-rings?
Stability. Because of their flat edges, Square Rings cannot roll in the groove. This eliminates twist-induced seal failure and provides a more reliable static surface seal.
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