O-Ring 350x7 mm NBR 70 Shore

Premium-grade O-Ring 350x7 mm NBR 70 Shore designed for heavy-duty industrial sealing applications requiring a large-diameter rubber seal with excellent resistance to oils and hydraulic fluids. Manufactured from high-quality NBR (nitrile butadiene rubber) with a hardness of 70 Shore A, this technical sealing component provides reliable performance in static and low-dynamic environments commonly found in industrial machinery, hydraulic systems, pumps, heavy vehicles, and power transmission equipment.

This size is frequently searched in global procurement markets under terms such as “O-Ring 350x7”, “large size O-Ring NBR”, “industrial sealing ring 350 mm ID”, “NBR 70 Shore rubber gasket”, and is widely requested by maintenance departments (MRO), OEM manufacturers, and engineering distributors.

Applications

The O-Ring 350x7 is ideal for:

• Industrial hydraulic and pneumatic systems

• Large pumps, valves, pressure vessels, filtration systems

• Machine tool equipment and industrial gear systems

• Stationary sealing in high-pressure industrial interfaces

• Maintenance and repair operations (MRO), service workshops and OEM production

Its 350 mm inner diameter and 7 mm cross-section enable stable sealing of large housings and flanges, reducing leakage risk and improving long-term operational safety.

Advantages

• NBR 70 Shore formulation ensures excellent durability and resistance to oils, greases, fuels, and hydraulic fluids

• High sealing reliability in static and slow-reciprocating applications

• Cost-effective and versatile solution for standard industrial sealing requirements

• High mechanical strength and wear resistance for extended operating cycles

• Proven performance in demanding industrial applications

Technical Data

• Inner Diameter (ID): 350 mm

• Cross-Section (CS): 7 mm

• Material: Nitrile Butadiene Rubber (NBR)

• Hardness: 70 Shore A

• Temperature Range: approx. -30 °C to +100 °C depending on fluid compatibility

• Resistance: mineral oils, lubricants, grease, hydraulic fluids

• Seal Type: static and low-dynamic sealing ring

• Color: standard black

FAQ

Q1: What does the size 350x7 mean?
It specifies an inner diameter of 350 mm and a cross-section thickness of 7 mm, defining groove and housing compatibility.

Q2: Is NBR 70 Shore suitable for hydraulic systems?
Yes — NBR is the most commonly used elastomer in hydraulics due to excellent resistance to oils and controlled compression stability.

Q3: Can this O-Ring work in dynamic rotary applications?
It can be used in slow reciprocating motion, but not as a high-speed rotary shaft seal. For rotating shafts, choose a rotary oil seal instead.

Q4: What industries most frequently use this size?
Heavy machinery, transport equipment, industrial hydraulics, water treatment systems, energy and mining sectors.

Q5: What alternatives exist for high-temperature or aggressive chemicals?
For harsh chemicals or elevated temperatures above +120 °C, select materials such as FKM/Viton.