Type S Oil Seal & Type SAS Oil Seal

Type S Oil Seal and SAS Oil Seal Supplier UK

The totally metal encased, single sprung lip Type S Oil Seal has a very rigid construction particularly useful for heavy or dirty applications. The additional reinforcing inner cup can also be used for assembly in the &#;reverse&#; direction. Available in Nitrile (NBR), Viton® (FKM/FPM), Polyacrylic (ACM) and Silicone (VMQ) in inch and metric sizes.

If you want to learn more, please visit our website.

Type S Oil Seal : Totally encased built up single lip type

Similar in construction to the &#;S&#; type, this seal has the benefit of an additional moulded dirt lip as shown in the more common &#;BS&#; type. Also available in Nitrile (NBR), Viton® (FKM/FPM), Polyacrylic (ACM) and Silicone (VMQ) as well as in inch and metric sizes.

Type SAS Oil Seal: Built up semi-dual type

For more information on our range of Oil Seals, download the catalogue or contact a member of the team.

Description

Structure of oil seals and workings of each part

The following figure and table show the structure of oil seals and workings of each part, respectively.

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Things to note when designing Woven Gabion Baskets

Structure of oil seals and workings of each part

Name Workings of each part Lip Lip tip The lip tip has a wedge-shaped cross section and the function of sealing the fluid as it is pressed against the shaft surface. Seal lip The seal lip is made of a flexible elastomer, and designed to maintain stable sealing performance against vibration of machinery and pressure change of the sealed fluid. The spring maintains the force of the seal lip pressed against the shaft for a long time. Dust lip The dust lip is a supplemental lip without spring, and has the function of preventing the entry of dust. Fitting portion The fitting portion has the function of fixing the oil seal in the housing hole and preventing the leakage of the fluid from the contact surface between the outer circumferential surface of the oil seal and the inner circumferential surface of the housing or the entry of dust. The metallic ring has the function of securing the fitting force to fix the oil seal on the housing.

Main types, characteristics and related standards of oil seals

Shape Type Applications/characteristics JIS B JASO F401 ISO SC SB For oil, no dust lip Type 1
Type 2 S SM TYPE1 TYPE2 TC TB For oil, with dust lip Type 4
Type 5 D DM TYPE3 TYPE4 VC VB For grease, no dust lip (G) (GM) G GM   KC KB For grease, with dust lip   P PM  

Materials used for oil seals

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The following table shows main rubber materials, springs and metallic ring materials used for oil seals.

Main rubber material

Main material Characteristics of rubber material Operating temperature
(heat resistance) Material cost Nitrile rubber (NBR) &#; Material costs are low.
&#; Offers versatility and most commonly used.
&#; The operating temperature (heat resistance) is limited. &#;100&#; Acrylic rubber (ACM) &#; Superior in heat resistance to nitrile rubber.
&#; Resistance to brake fluid and fuel oil is inferior. &#;130&#; Silicone rubber (VMQ) &#; Superior in heat resistance to acrylic rubber.
&#; Has best cold resistance.(-60&#;&#;)
&#; Inferior in resistance to alkali and water. &#;150&#; Fluororubber (FKM) &#; Has best heat resistance.
&#; Most widely suitable for lubricating oils and fuel oils. &#;180&#;

Spring and metallic ring material

Fluid to be sealed&#;
Spring and metallic ring material Spring Metallic ring Standard material Dedicated material Standard material Dedicated material JIS G SW
Dedicated material
JIS G SWP
&#;Piano wire&#; JIS G SUS
(Stainless steel wire) JIS G SPCC
(Cold-rolled steel sheets
and steel strips)
JIS G SPHC
(Hot-rolled steel sheets
and steel strips) JIS G SUS
&#;Cold-rolled stainless steel sheets)
JIS G SUS
&#;Cold-rolled stainless steel strips) 304 316 304 316 Lubricating oil/grease &#; &#; &#; &#; &#; &#; Water × &#; &#; × &#; &#; Vapor × &#; &#; × &#; &#; Seawater × × &#; × × &#; Acid × × &#; × × &#; Alkali × &#; &#; × &#; &#;

&#;&#; Usable&#;×&#; Not usable

Method of selecting oil seals

To make full use of the function of oil seals, selecting the most suitable shape and material for the use conditions is necessary. Generally, the following steps are followed:

• Select the shape.

• Select the lip material.

• Select the metallic material.

• Select the dimensions.

Since NOK offers a wide range of lineup that meets various requirements, please see our catalogs or contact the sales office nearest you.

Design of oil seal mounted portion

Since the shaft, housing shape, roughness, etc. influence the performance of oil seals, key points for general shaft and housing design are described below.

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Key points for shaft and housing design

Mounted portion Design key points and recommended values Remarks (precautions) Shaft Material Use of carbon steel pipes for mechanical structures is recommended. Use of cast iron should be avoided as much as possible since pinholes may be generated. Hardness 30 HRC min.   Roughness and machining method &#; 0.32&#;0.1 μmRa and 2.5&#;0.8 μmRz are recommended.
&#; Finish with a grinder or emery paper is recommended. If shaft machining marks have orientation, leakage may be caused. Chamfering Chamfer the shaft ends.   Housing Material Steel or cast iron is recommended. Use of light metal or resign should be avoided as much as possible since they are thermally expanded significantly. Inner circumferential surface roughness Outer metal: 3.2&#;0.4 μmRa, 12.5&#;1.6 μmRz Outer rubber: 3.2&#;1.6 μmRa, 12.5&#;6.3 μmRz When the inner circumferential surface roughness is large, a gap is created between the contact faces, causing leakage.