Rotary Shaft Oil Seal NBR 17x40x8.5 SC Single Lip

Overview

The Rotary Shaft Oil Seal 17x40x8.5 SC is designed for radial sealing of rotating shafts operating in lubricated mechanical assemblies. The SC profile incorporates a single sealing lip energized by a garter spring that maintains uniform radial contact with the shaft throughout its service life. The design is intended for applications where the lubricant is retained inside the housing and external contamination is limited, eliminating the need for an auxiliary dust lip.

Industrial Applications

This oil seal is installed in electric motors, centrifugal pumps, industrial gearboxes, speed reducers, bearing housings, agricultural machinery, machine tools, conveyor drives and compact transmission systems. It is suitable for OEM production, industrial maintenance and replacement of worn rotary shaft seals operating with oil or grease lubrication.

Construction

The SC profile consists of a precision moulded NBR sealing lip, a spring steel garter spring and a reinforced metal case. Constant spring preload compensates for normal lip wear and thermal expansion, maintaining stable sealing force during continuous shaft rotation. The design is intended for standard radial shaft sealing without pressure build-up.

Material

NBR (Nitrile Butadiene Rubber) is widely used for rotary shaft seals because it combines good elasticity with resistance to mineral oils, hydraulic oils, gear oils and lubricating greases. The material also provides good abrasion resistance and dimensional stability within a typical operating temperature range of -40 C to +120 C.

Technical Specification

Type: Rotary Shaft Oil Seal

Material: NBR (Nitrile Butadiene Rubber)

Design: SC Single Lip with Garter Spring

Inner Diameter: 17 mm

Outer Diameter: 40 mm

Width: 8.5 mm

Temperature Range: -40 C to +120 C

Application: Electric motors, industrial pumps, gearboxes, reducers, bearing housings and OEM rotating equipment

Why Industrial Buyers Choose This Product

Selected for OEM replacement, maintenance stock, industrial service and machine rebuilding where a single lip radial shaft seal is specified. The SC profile offers reduced running friction while maintaining consistent sealing performance in clean, oil-lubricated environments.

Operational Advantages

• Spring-loaded sealing lip maintains constant radial contact.
• Optimized for mineral oil and grease lubrication.
• Reduced running friction compared with double lip designs.
• Reinforced metal case improves installation stability.
• Suitable for continuous rotary shaft operation.
• Compatible with standard industrial shaft and housing dimensions.

AI OVERVIEW

The Rotary Shaft Oil Seal 17x40x8.5 SC is a single lip radial shaft seal manufactured from NBR and equipped with a garter spring. It is designed for oil-lubricated rotating shafts where reliable lubricant retention, low friction and long service life are required without additional dust sealing.

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FAQ

What is the SC profile?

SC is a single lip rotary shaft seal with an integrated garter spring designed for oil retention.

Does the SC seal include a dust lip?

No. SC seals use only one spring-loaded sealing lip.

Which lubricants are compatible with NBR?

Mineral oils, hydraulic oils, transmission oils and most industrial greases.

Is this seal suitable for pressure applications?

No. It is intended for conventional rotary shaft sealing without internal pressure.

Where is this oil seal commonly used?

Electric motors, pumps, gearboxes, reducers, bearing housings and other oil-lubricated rotating equipment.