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Meet the heavy-duty sealing solution for your large-scale projects! Our 7mm Cross Section NBR O-Rings are specifically designed for applications requiring large diameters, with an OD range from 414mm to 754mm. Crafted from premium Nitrile Rubber, these robust seals offer unmatched reliability against oils, fuels, and industrial fluids for large machinery and equipment.
š Perfect for Large Glands: The substantial 7mm cross-section provides excellent stability and sealing force in large-diameter grooves, preventing roll and twist while resisting extrusion under pressure. Ideal for big hydraulic cylinders and industrial flanges.
| Material | Nitrile Rubber (NBR / Buna-N) ā Superior resistance to oils, fuels, and hydraulic fluids, perfect for industrial environments. |
|---|---|
| Cross Section (Thickness) | 7mm (0.276") ā Heavy-duty profile for large-diameter applications requiring stability and high-pressure resistance. |
| Outer Diameter (OD) Range | 414mm (16.3") to 754mm (29.7") ā Specifically sized for large equipment, machinery, and industrial applications. |
| Hardness (Durometer) | Shore 70A ā Provides the perfect balance of flexibility for sealing and firmness for installation in large grooves. |
| Temperature Range | -40Ā°F to +248Ā°F (-40Ā°C to +120Ā°C) ā Withstands temperature extremes common in outdoor and industrial settings. |
| Key Features | Excellent oil & fuel resistance, superior abrasion resistance, low compression set, reliable sealing for large dynamic and static applications. |
These large 7mm O-rings are engineered for heavy-duty sealing in demanding, large-scale applications:
A 7mm cross-section provides critical stability in large diameters. Thinner O-rings can twist or roll in wide grooves during installation or under pressure. The 7mm thickness ensures the seal stays seated, provides a larger sealing surface, and offers greater resistance to extrusion through gaps, which is more pronounced in large assemblies.
For large O-ring installation, ensure the groove is clean and free of sharp edges. Use a blunt, rounded tool to guide the O-ring into place. Lubricate with a compatible grease or fluid (like silicone grease) to reduce friction. Stretch it evenly and avoid twisting. For very large diameters, having two people can help distribute the stretch evenly.
Yes, within limits. NBR has good resistance to weathering, ozone, and water, making it suitable for outdoor equipment. However, for constant UV/sun exposure, consider a cover. Its excellent temperature range (-40Ā°F to 248Ā°F) handles most climatic conditions for industrial and agricultural machinery.
Absolutely. These 7mm diameter O-rings are commonly used as static seals on flanged connections. Ensure the groove is designed for an O-ring (with proper depth and width). The O-ring should sit in the groove, and when the flanges are bolted together, it compresses to create a leak-tight seal, even around bolt holes.
To ensure they arrive without permanent deformation, our large-diameter O-rings are carefully packaged. They are typically coiled in a large, gentle coil or placed in a protective ring to maintain their shape. Each is individually bagged to prevent contamination. Instructions for relaxing the O-ring before installation are included.
