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Black NBR O-rings are compression molded with a 3.2mm cord and outer diameters from 9mm to 400mm, offering good oil resistance and waterproof sealing performance.
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Full-size customization is available; cord diameter, outer diameter and hardness can be confirmed to drawing or sample for hydraulic, pneumatic and pipeline sealing applications.
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Factory supply includes sample testing and bulk orders; NBR compound and dimensional tolerance should be confirmed against the actual medium, temperature and compression ratio.
Juntas tóricas de NBR
Oil Resistant Waterproof NBR O-Ring 9mm to 400mm Factory
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Nuestro NBR O Rings (Nitrile Rubber O-Rings) are high-quality industrial rubber seals designed for reliable sealing performance in hydraulic, pneumatic, automotive, and industrial applications. Made from durable nitrile butadiene rubber, these oil-resistant O-rings offer excellent resistance to mineral oils, fuels, grease, and water. With good elasticity, compression recovery, and wear resistance, NBR rubber O-rings are suitable for both static and dynamic sealing applications under moderate temperature conditions.
Como profesional NBR O-ring manufacturer and supplier, we offer standard NBR O-ring sizes in stock, as well as custom rubber O-rings in various inner diameters, cross-sections, hardness levels, and colors. Our custom NBR O-rings, nitrile rubber seals, waterproof O-rings, and hydraulic sealing rings provide cost-effective sealing solutions for pumps, valves, cylinders, pipelines, automotive systems, and pneumatic equipment. OEM and ODM services are available to meet different industrial sealing requirements.
NBR O- Ring Technical Table
Artículo Especificación Material Name NBR (Nitrile Butadiene Rubber) O Ring Seals Common Hardness Shore A 40 – 90 (Standard: Shore A 70) Operating Temperature Range -40℃ to 120℃ Low Temperature Resistance Excellent flexibility at low temperature Resistencia a altas temperaturas Stable performance under continuous 100℃ working condition Resistencia al aceite Excellent resistance to mineral oil, engine oil, hydraulic oil and grease Water Resistance Good waterproof and anti-leakage performance Abrasion Resistance Good wear resistance for dynamic sealing applications Compression Set Low compression deformation, long sealing stability Weather Aging Resistance Moderate aging resistance, not suitable for long-term outdoor UV exposure Chemical Compatibility Resistant to oil, water, fuel and common lubricants Incompatible Media Strong oxidants, ketones, esters, strong solvents Tipo de sellado Static sealing & dynamic sealing Standard Sizes Metric sizes / AS568 inch standard sizes Personalización Custom hardness, size and color available Environmental Standard RoHS compliant Aplicaciones principales Hydraulic systems, pneumatic systems, pumps, valves, compressors, automotive parts, agricultural machinery, construction machinery, general industrial equipment Feature Most cost-effective, widely used, reliable industrial rubber sealing ring How to measure the O-Rings Size ?
1. No mida las juntas tóricas con una regla.
2. Utilice un calibrador para obtener con precisión el diámetro interior (DI), el diámetro exterior (DE) y la sección transversal (SC).
3. Las juntas tóricas de goma se deforman fácilmente. Una medición precisa garantiza un ajuste adecuado y evita fugas.
O-Ring ID size tolerance for GB/T 3452.1-2005 estándar
Standard d₁(mm) G-Series Tolerance ±(mm) A-Series Tolerance ±(mm) 1.8~5.0 0.13 0.08 5.3~8.5 0.16~0.17 0.09~0.10 8.7~12.5 0.18~0.20 0.10~0.12 13.2~18.0 0.21~0.25 0.12~0.14 19.0~26.5 0.25~0.30 0.14~0.17 27.3~37.5 0.31~0.34 0.17~0.20 38.7~50.0 0.34~0.40 0.20~0.23 51.5~67.0 0.41~0.48 0.23~0.27 69.0~90.0 0.49~0.60 0.27~0.33 92.5~125 0.61~0.78 0.33~0.42 132~180 0.82~1.02 0.42~0.54 190~250 1.06~1.34 0.54~0.70 258~355 1.37~1.82 0.70~0.95 365~500 1.86~2.48 0.95~1.30 Observación:
- G series: General purpose O-rings, looser tolerance for normal hydraulic & pneumatic applications
- A series: Aerospace grade O-rings, tighter ID tolerance for high-precision, high-reliability sealing
Cross-section tolerance:
1.8:±0.08mm 2.65:±0.09mm 3.55:±0.10mm 5.3:±0.13mm 7.0:±0.15 mm.We have strict size inspection for each order .Tight tolerance control guarantees consistent performance batch after batch.
Our NBR O-Rings Advantages
Our NBR nitrile rubber O-rings offer good rebound resilience, recovering quickly after repeated compression and under dynamic sealing conditions to help maintain stable sealing performance.
Made from premium NBR nitrile rubber, offering oil resistance, wear resistance, good rebound resilience and reliable sealing performance for hydraulic, pneumatic and pipeline sealing applications.
Smooth surface finish with no burrs, helping reduce friction and leakage risk.
Application Areas of NBR O-Rings
NBR O-rings are mainly valued for oil resistance, wear resistance, good rebound resilience and reliable sealing. Typical applications include:
- Hydraulic systems: static and dynamic sealing at hydraulic cylinders, valves, pumps and pipe joints.
- Pneumatic systems: sealing for cylinders, pneumatic valves, air line fittings and pneumatic actuators.
- Automotive industry: oil-resistant sealing points in engines, gearboxes, fuel systems, lubrication circuits, brake systems and air-conditioning lines.
- Industrial pumps and valves: sealing for water pumps, oil pumps, chemical pumps (non-highly corrosive media), valves, flanges and pipe connections.
- Mechanical equipment: bearing end covers, reducers, gearboxes, compressors and rotating/reciprocating parts.
- Oil and fuel systems: sealing for mineral oil, lubricating oil, diesel, hydraulic oil and similar media; not recommended for aromatic hydrocarbons, ketones, esters or strongly oxidizing media.
- Plumbing and general industry: medium- and low-pressure sealing for water, air and neutral media; for outdoor applications requiring high weather and ozone resistance, use with caution or switch to EPDM or other suitable materials.
Nota de selección: NBR typically serves from about -40°C to +100°C (short-term up to around 120°C). It has good oil resistance but limited resistance to ozone, weathering and polar solvents. For strong acids, strong alkalis, ketones, esters, aromatic hydrocarbons or long-term outdoor exposure, FKM, EPDM or other materials should be evaluated.
Common rubber O-rings (NBR ,EPDM,VMQ,FKM)
Brief Introduction:
This guide compares four common O-ring materials: FKM, VMQ, NBR and EPDM. FKM offers excellent heat and chemical resistance, making it suitable for fuels, oils and aggressive media. VMQ (silicone) provides a wide temperature range and good flexibility but limited oil resistance. NBR is the standard choice for oil and fuel sealing with good mechanical properties, while EPDM excels in water, steam and weather resistance but is not oil-resistant. Selecting the right material depends on the operating temperature, medium and sealing application.
Our factory Production equipment
We are equipped with complete production facilities including mixing machines, CNC machines, injection molding machines, cryogenic deflashing machines and post-curing ovens. In-house mold making and automated workflows boost efficiency to support fast order delivery.
Servicio de embalaje, pago y envío
- PaqueteOfrecemos cajas de cartón estándar, palets y cajas de madera. Si lo desea, podemos ofrecerle embalaje personalizado para proteger sus productos durante los diferentes envíos.
- Métodos de pago:Liquidación en múltiples divisas (CNY, USD, EUR, etc.). Diversas opciones de pago, incluyendo transferencia bancaria y PayPal. Para transacciones más rápidas, se ofrece transferencia bancaria local en algunos países.
- Método de entrega:Ofrecemos transporte exprés internacional, transporte aéreo, marítimo y ferroviario. También puede designar a su propio agente de transporte para una mayor flexibilidad en las entregas.
Juntas de goma suministradas por nosotros
We manufacture a full range of sealing products: O-rings and X-rings in NBR, EPDM, FKM, FFKM, VMQ, HNBR; oil seals of various styles including TC, TG, VC, TB, TA, VB, SB, SA, VA, DC, HTC. We also supply ED seals, bonded seals, wiper seals, gaskets, washers, rubber balls, and custom special-shaped sealing profiles. Custom non-standard rubber seals are available to match your unique working conditions.
Servicio OEM y ODM
Ofrecemos servicios de colaboración OEM y ODM. En el modelo OEM, los clientes proporcionan planos, muestras, materiales y especificaciones dimensionales, y nosotros fabricamos según sus especificaciones con embalaje personalizado, ideal para pedidos con un diseño claramente definido. En el modelo ODM, participamos en la selección de materiales, el ajuste de compuestos, el desarrollo de moldes, el diseño de tamaño y dureza según las condiciones de operación del cliente, y ofrecemos producción de marca blanca, ideal para clientes que requieren soporte integral desde el desarrollo del producto hasta la producción en masa. Ambos modelos están disponibles para bolas de goma, juntas tóricas y otras piezas de sellado de goma personalizadas, con plazos de entrega, costes de utillaje y cantidad mínima de pedido (MOQ) confirmados para cada proyecto.
Preguntas frecuentes-
What is the normal service temperature of NBR O-rings? Can they be used at 120°C for short periods?
NBR typically serves from about -40°C to +100°C, with short-term peaks up to around 120°C, but service life will be noticeably reduced. For long-term use above 100°C or in hot oil, consider a higher-temperature material such as FKM, and validate heat aging performance against the actual temperature, medium and compression ratio.
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What is the maximum size of molded parts you can produce?
Our 350-ton molding press supports large-size molding, with a maximum part dimension of 102” × 72” for oversized rubber and polyurethane components.
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¿A qué materiales son resistentes las juntas tóricas de NBR y cuáles no se recomiendan?
El NBR presenta buena resistencia a aceites minerales, aceites lubricantes, aceites hidráulicos, diésel, gasolina y muchas grasas. No se recomienda su uso en presencia de cetonas (acetona, MEK), ésteres, hidrocarburos aromáticos (benceno, tolueno), ácidos fuertes, álcalis fuertes, medios altamente oxidantes ni exposición prolongada al ozono o a la intemperie. Para estos últimos, se recomienda utilizar FKM, EPDM, PTFE u otros materiales adecuados.
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What is the common hardness of NBR O-rings, and how should hardness be selected?
70 Shore A is the most common hardness, with 50–90 Shore A generally available. Lower hardness can improve contact in low-pressure static sealing; higher hardness is preferred for high-pressure, dynamic sealing or extrusion-resistant applications, together with backup rings or adjusted groove clearance. Hardness tolerance is usually controlled at ±5 Shore A.
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What is the typical compression set of NBR O-rings?
Compression set depends on compound, hardness and test conditions. For a general-purpose 70 Shore A NBR, typical values under ASTM D395 at 70 h/100°C are about 20%–35%, and low-compression-set grades can be lower. Sealing applications should be validated against the actual compression ratio, temperature and time rather than judged by material grade alone.
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What standards apply to NBR O-ring dimensional tolerances, and how are non-standard sizes handled?
Common standards include GB/T 3452.1, ISO 3601-1 and AS568. Standard parts should be checked against the cord diameter and inside diameter tolerances in the applicable standard; for non-standard sizes, cord diameter, inside diameter tolerance and roundness requirements should be separately agreed in drawings or technical agreements. For incoming inspection, cord diameter tolerance should be controlled first because it directly affects compression and sealing performance.
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What should be noted during installation and storage of NBR O-rings?
Before installation, clean the groove and sealing surface, apply a lubricant compatible with NBR if needed, and avoid twisting, scratching or excessive stretching. Groove design should provide a static sealing compression ratio of about 15%–25% and a dynamic sealing compression ratio of about 10%–15%. Store in a dark, cool place away from ozone, motors and direct sunlight; keep original packaging unopened at room temperature and follow first-in, first-out.
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¿Cuáles son los modos de fallo más comunes de las juntas tóricas y cómo identificarlos?
- Deformación permanente por compresión: sección transversal aplanada y superficies de contacto planas, debido al calor o a una presión excesiva; - Extrusión (mordisqueo): bordes irregulares y deshilachados en el lado de baja presión, debido a una holgura o presión excesivas; - Fallo en espiral: cortes en espiral de 45° en la superficie, comunes en pistones de carrera larga cuando las piezas se deslizan y ruedan simultáneamente; - Abrasión: superficies rayadas/desgastadas por superficies de contacto rugosas o lubricación deficiente; - Ataque químico: hinchazón, agrietamiento o reblandecimiento por medios incompatibles.
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