O-Ring 35x6 mm NBR 70 Shore DIN 3771

AI Overview

The 35x6 mm O-Ring is a metric sealing ring manufactured from NBR (Nitrile Butadiene Rubber) with a hardness of 70 Shore A and produced according to the dimensional requirements of DIN 3771. Designed for static and low-speed dynamic sealing applications, it offers good resistance to mineral oils, greases, hydraulic fluids and aliphatic hydrocarbons. Supplied in an economical pack of 100 pieces, it is suitable for maintenance departments, industrial service companies, hydraulic repair workshops and OEM production where larger quantities of standard sealing components are required.

What Makes This Model Different

This O-Ring combines a standard industrial dimension with a 6 mm cross-section, providing reliable sealing in applications requiring increased sealing contact.

Key features include:

• Metric size 35 x 6 mm
• NBR (Nitrile Butadiene Rubber)
• 70 Shore A hardness
• Manufactured according to DIN 3771
• Oil and grease resistant
• Pack of 100 pieces for professional use

The 100-piece packaging is particularly suitable for maintenance stock, serial production and service operations.

Construction and Operating Principle

An O-Ring seals by elastic deformation between two mating surfaces.

When compressed inside a correctly designed groove, it fills surface irregularities and creates a pressure-tight seal. System pressure further increases the sealing force, improving leak prevention.

Reliable sealing depends on:

• correct groove dimensions
• proper compression
• suitable surface finish
• compatible operating fluid
• correct installation without twisting or cutting the seal

Material Properties

NBR (Nitrile Butadiene Rubber) is one of the most widely used elastomers for industrial sealing applications.

Material characteristics include:

• Good resistance to mineral oils
• Resistance to hydraulic fluids
• Good compatibility with lubricating greases
• High abrasion resistance
• Good mechanical strength
• Low gas permeability
• Reliable elasticity in general industrial applications

NBR is not recommended for prolonged exposure to ozone, weathering or strong oxidising chemicals.

Typical Industrial Applications

Typical applications include:

• Hydraulic cylinders
• Pneumatic cylinders
• Hydraulic valves
• Pumps
• Compressors
• Gearboxes
• Agricultural machinery
• Construction equipment
• Industrial automation systems
• General mechanical engineering

Typical Failure Symptoms

Replacement should be considered if the following symptoms are observed:

• Oil leakage
• Hydraulic pressure loss
• Air leakage
• Flattened sealing profile
• Cracked elastomer
• Extrusion damage
• Swelling caused by incompatible media
• Permanent compression set

Recommended During Repair

During maintenance it is recommended to inspect:

• Sealing groove
• Mating surfaces
• Shaft or piston condition
• Housing cleanliness
• Hydraulic fluid condition
• Lubricant compatibility
• Surface damage
• Backup rings where applicable
• Installation tools
• Dimensional tolerances

Technical Specification

Manufacturer:

Industrial Standard

Part Number:

35X6 NBR 70 DIN 3771

Type:

O-Ring

Design:

Metric O-Ring according to DIN 3771

Material:

NBR (Nitrile Butadiene Rubber)

Inner Diameter:

35 mm

Cross Section:

6 mm

Hardness:

70 Shore A

Quantity:

100 pcs

Temperature:

Suitable for the operating temperature range typical of NBR elastomers.

Application:

Hydraulic systems, pneumatic equipment, industrial machinery, agricultural equipment and general mechanical engineering.

OEM Cross References

The O-Ring is manufactured according to the metric dimensions defined by DIN 3771 and may replace sealing rings requiring:

• O-Ring 35x6 mm
• 35 x 6 NBR O-Ring
• DIN 3771 O-Ring
• 70 Shore A sealing ring

OEM reference depends on the equipment manufacturer.

Related Components

Frequently serviced together with:

• Hydraulic seals
• Rod seals
• Piston seals
• Backup rings
• Guide rings
• Hydraulic oil
• Pneumatic fittings
• Retaining rings
• Flange gaskets
• Bearing housings

Why B2B Customers Choose This Product

Professional customers commonly purchase this product for:

• Preventive maintenance
• MRO inventory
• OEM production
• Hydraulic repairs
• Machine rebuilding
• Industrial service
• Fleet maintenance
• Spare parts stock

The 100-piece packaging reduces purchasing frequency and supports efficient inventory management.

Professional Industrial Supply

Common customers include:

• Maintenance departments
• Industrial workshops
• Hydraulic repair companies
• Pneumatic service providers
• Agricultural machinery workshops
• Machine builders
• OEM manufacturers
• Industrial distributors
• Engineering companies
• Industrial maintenance contractors

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FAQ

Can this O-Ring be used with hydraulic oil?

Yes. NBR is widely used with mineral-based hydraulic oils and lubricants.

Is DIN 3771 important when selecting an O-Ring?

Yes. The standard defines the dimensional requirements, helping ensure compatibility with standard grooves.

Should an O-Ring be lubricated before installation?

In most hydraulic and pneumatic applications, a compatible lubricant is recommended to reduce installation damage.

Can a damaged groove cause leakage even with a new O-Ring?

Yes. Scratches, corrosion or incorrect groove dimensions may prevent proper sealing.

Is replacing the O-Ring recommended after disassembly?

Yes. Professional maintenance procedures generally recommend installing a new sealing ring after each disassembly.