Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
NBR Semi-finished Tube for CNC Seal Turning
NBR tube is used for machining into rubber seal ring
Material: NBR
Color: Black
Hardness: 85 shore A
Temperature: -30 to 100℃
5.0
design customization
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Please fill out the form below to request a quote or to request more information about us. please be as detailed as possible in your message, and we will get back to you as soon as possible with a response. we're ready to start working on your new project, contact us now to get started.
1. Basic Definition
NBR semi-finished tube is a fully vulcanized nitrile rubber hollow sleeve with reserved machining allowance on inner and outer diameters. It is specially designed for lathe processing instead of traditional mold vulcanization. It features low cost, stable oil resistance and excellent machinability, suitable for mass production of conventional industrial sealing parts.
2. Chemical & Media Resistance
✅ Excellent Resistance: Mineral oil, diesel, gasoline, lubricating oil, hydraulic oil, grease, water, aqueous solution, common hydraulic fluids ❌ Poor Resistance: High temperature steam, strong acid & strong alkali, ketones, esters, aromatic solvents, ozone, weather aging (outdoor use not recommended)
3. Size & Tolerance Specification
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Shape: Standard hollow cylindrical rubber billet
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Dimensions: Standard stock OD/ID sizes, custom sizes available; 0.3~1mm single-side machining allowance reserved
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Color: Black
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Tolerance: OD ±0.2~0.4mm (unprocessed billet)
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Standard Length: 120mm, 150mm
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Surface: Smooth vulcanized surface, no bubbles, no cracks, no impurities
4. Manufacturing & Processing Method
NBR compound mixing → hollow tube extrusion → high-temperature full vulcanization → fixed-length cutting → finished semi-finished tube. End users can directly process various non-standard and standard seals through CNC lathe turning, which saves mold opening cost and is efficient for small-batch and multi-specification production.
5. Application Scenarios
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General hydraulic and pneumatic equipment seals (O-rings, U-seals, wiper seals, gaskets)
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Automotive conventional parts: engine oil seals, chassis oil-resistant seals
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Mechanical equipment, bearings, pumps and valves oil-resistant sealing
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Household appliances, electronic equipment conventional sealing parts
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Food and beverage equipment (FDA grade NBR tube)
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