SEAL SPECIFICATION GUIDE

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SEAL SPECIFICATION GUIDE SEAL TOLERANCES To provide an interface between the seal outside surface and the housing bore surface, the recommended tolerances for the outside diameter of the seal are indicated below. 10 Seal width tolerance Values in millimeters SEAL WIDTH b TOLERANCE b < 10 ± 0.3 b > 10 ± 0.4 SEAL OUTSIDE DIAMETER TOLERANCES (VALUES IN MILLIMETERS) NOMINAL DIAMETRAL TOLERANCE ROUNDNESS TOLERANCE 1 OUTSIDE DIAMETER METAL RUBBER METAL RUBBER D CASED COVERED2,3 CASED COVERED D
MATERIAL SELECTION General Elastomer Information BASE POLYMER NITRILE POLYACRYLATE SILICONE FLUOROELASTOMER TEMPERATURE* -50˚F ~ 250˚F -20˚F ~ 300˚F -80˚F ~ 400˚F -30˚F ~ 400˚F RANGE -45˚C ~ 125˚C -30˚C ~ 150˚C -60˚C ~ 200˚C -35˚C ~ 200˚C Oil Resistance l l n l Acid Resistance n s s s Alkali Resistance n v v s Water Resistance n s n n Heat Resistance n l l l Cold Resistance n s n s Wear Resistance l l n l Ozone Resistance n l l l lVery good n Good for most applications s Fair, can be used if no other materials available but otherwise not recommended v Not recommended MATERIALS ADVANTAGES DISADVANTAGES NITRILE • Commonly referred to as Buna-N and a • Poor resistance to ozone and weather aging S Copolymerof Butadiene and Acryonitrile • Low cost • Good resistance to petroleum oils, water, silicone oils,greases, glycol base fluids • Good abrasion resistance, cold flow, tear resistance POLYACRYLATE • Polymerised acrylic acidesters • Fair cold temperature limit N • Good resistance to mineral oils, hypoid gear oils, • Lower mechanical strength E.P. additives, greases, aging and flex cracking • Costs slightly higher than Nitrile • Higher temperature limit than Nitrile • Poor dry running ability, water resistant SILICONE • Broad temperature range • Low resistance to hydrocarbon fluids like H • Good ozone resistance gasoline or paraffin fluids or steam above 50 psi • Resistant to compression set • Cost is higher than Polyacrylate FLUOROELASTOMER • Good temperature resistance • Fair resistance to water, dry running V • Compatible with wide range of fluids • Low temperature resistance is fair • Commonly chosen as high temperature replacement for Nitrile or Polyacrylate • Cost is high ETHYLENE ACRYLIC • Good resistance to lubricating oils, greases, • Poor steam resistance (Vamac ® ) transmission fluids, power steering fluids and • Fair cold temperature limit E diesel fuel • Higher temperature limit than NBR • High/Consistent vibration damping capability • Cost is higher than NBR FKM & ACM BLEND • Better fluids resistance than ACM • Cost is higher than ACM X • Better high temperature performance than ACM • Properties tend to be closer to ACM than FKM FKM & VMQ BLEND • Better low temperature properties than FKM • Cost is higher than VMQ Y • Better oil resistance than VMQ • Properties tend to be closer to VMQ than FKM Felt (F) - Adequate seal for heavier lubricants, commonly used as a wiper seal. Urethane (U) - Good lubricant resistance, good ozone resistance, good abrasion resistance Tetrafluoro-Ethylene Propylene (Aflas ® ) (A) - Compatible with range of hydraulic fluids, fair abrasion resistance P.T.F.E. (Teflon ® ) (T) - Low friction properties, good heat and chemical resistance TEFLON ® , VAMAC ® and VITRON ® are registered trademarks of E.I. Dupont. AFLAS ® is a registered trademark of the 3M Company. 11
Page 1 and 2: SSG SEAL SPECIFICATION GUIDE THE TI
Page 3 and 4: TABLE OF CONTENTS SECTION. . . . .
Page 5 and 6: SEAL DESIGN/TYPES 10S 20S 50S 40S 7
Page 7 and 8: SHAFT RECOMMENDATIONS Shafts Seal a
Page 9 and 10: BORE RECOMMENDATIONS Bore Diameter
Page 11: OPERATING CONDITIONS Eccentricity S
Page 15 and 16: IMPROPER METHOD OF SEAL INSTALLATIO
Page 17 and 18: KWIK-SLEEVE TM - COMPONENTS Put the
Page 19 and 20: Part Part Shaft Bore O.D. Width Num
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Part Part Shaft Bore O.D. Width Num
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Styles VS1, VS3, & VS4 Style VS2 Sh
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Shaft Bore O.D. Width Part Number T
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Shaft Bore O.D. Width Part Number T
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Shaft Diameter Width on Overall Fla
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Part Seal Shaft O.D. Width Number N
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Part Seal Shaft O.D. Width Number N
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Part Number Style Matl Shaft Bore O
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Styles VS1, VS3, & VS4 Style VS2 Pa
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Shaft Diameter Range Width on Overa
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Part Seal Number Shaft O.D. Width N
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Part Seal Number Shaft O.D. Width N
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Shaft Bore O.D. Width Part Number S
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Part Part Number Width I.D. O.D. Nu
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SEAL TYPES 10S 20S 50S 40S 70S 260
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NOTES 200
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