Eriks Technical Manual O Ring Gland Design Information-Books Download

ERIKS Technical Manual O Ring Gland Design Information
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TECHNICAL DOCUMENTATION O RINGS,12 O ring Gland Design. Dynamic Applications,There are three types of dynamic appli. Reciprocating Seal,Oscillating Seal,Rotating Seal,Application in reciprocating and. oscillating motions,Groove dimensions for reciprocating. and oscillating applications are the, Dynamic applications due to the Application of O rings in rotary Surface Finish for Dynamic Grooves.
motion against the O ring are more motions Straight sided grooves are best to pre. complicated than static applications In a rotating application a shaft contin vent extrusion or nibbling Five degree. Fluid compatibility must be more care uously rotates in the inside diameter of sloping sides are easier to machine. fully scrutinized because a volume the O ring causing friction and heat and are suitable for pressures up to. swell of more than 20 may lead to Because rubber is a poor conductor of 1500 psi 100 bar The rubbing sur. difficulties with high friction problems heat the O ring can loose its proper faces should be 8 to 16 RMS without. and only a minimum of shrinkage at ties To minimize or reduce wear the longitudinal or circumferential scratches. most 4 can be tolerated to avoid following could be done however Best surfaces are honed burnished or. leakage problems consult the local ERIKS representative hard chrome plated Finishes of. Because of the movement between the confirm amount of squeeze dynamic contacting surfaces have a lot. gland parts there always is a clearance use the smallest possible cross to do with the life of the O ring seals. gap with a potential risk for extrusion of section Appropriate surface finishes are impor. the O ring select an O ring with internal lubri tant Limits of maximum roughness for. O ring seals are best in dynamic appli cation or use low friction minerals glands are given Rougher finishes will. cations when used on short stroke do not exceed a temperature of cause excessive wear Finer finishes. relatively small diameter applications 212 F 100 C reduce lubrication to the O ring and. Long stroke large diameter seals are do not use a shaft which is larger may result in stick slipping and irregu. more susceptible to spiral failure than the inside diameter of the O lar wear Surface roughness values. ring less than 5 micro inches 0 15 mRa, provide lubrication are not recommended for dynamic O. do not let the O ring rotate in the ring seals The surface must be rough. groove only relative to the shaft enough to hold small amounts of oil. rough sealing surfaces of the groove Finishes below 5 RMS wipe too clean. will prevent rotation for good moving seal life, check surface finish Steel or cast iron cylinder bores are. may be too rough preferred They should be thick,enough not to expand or breathe with. Installing the O ring pressure otherwise the radial clear. Mating metal surfaces are generally of ance gap may expand and contract. different metals with one metal being with pressure fluctuations causing. softer than the other The O ring nibbling of the O ring. groove should be put in the softer of,the metals In the event that the metals. wear on each other the harder metal,will be less damaged thus insuring a.
good sealing surface,SEALING ELEMENTS,12 O ring Gland Design. Friction Soft metals like aluminum brass Seal extrusion. In normal applications harder materials bronze monel and some stainless If the radial clearance gap between. provide less friction than softer materi steels should be avoided the sealing surface and the groove. als However the higher the hardness Metallic moving surfaces sealed by an corners clearance gap is too large. of the O ring above 70 Shore A the O ring preferably should never touch and the pressure exceeds the defor. greater the friction This is because the but if they must then the one containing mation limit of the O ring extrusion of. compressive force at the same the O ring groove should be a soft the O ring material will occur. squeeze is greater than with softer bearing material When this happens the extruded. materials If excessive clearance is created material wears or frays with cycling. extrusion will result If adequate and the seal starts to leak. Compound swell decreases the hard squeeze has not been applied leakage. ness and may increase friction The will result For extrusion and direction of pressure. lower the operating temperature the information for static seals see. harder the seal becomes which can If friction is excessive a variety of fig 1 26 In a reciprocating application. also increase friction However ther possible solutions exist the tendency for extrusion will. mal contraction of the seal material Select a different O ring hardness increase if friction and system pres. which reduces effective squeeze may Select a different O ring material with sure act on the O ring in the same. offset any increased friction caused by improved coefficient of friction direction Groove design can reduce. an increase of hardness Increase the groove depth the tendency for extrusion. Consider the use of an alternate See figures 1 32 a b. Breakout friction is the force necessary design of seal. to start relative motion This is depen Viton has much lower friction than. dent upon the length of the time NBR or EPDM or Silicone If the friction of the moving metal sur. between cycles It also depends on the Check to ensure squeeze is within face across the O ring is in the same. surface finish of the metal the rubber the recommended range direction as the direction of the pres. hardness squeeze and other friction Do not reduce the squeeze below sure the O ring will be dragged into. affecting factors After standing 10 recommended levels in an attempt to the clearance gap more readily and. days the breakout friction will be 2 to reduce friction The reduction in thus extrude at about 35 of the. 5 times the friction of a seal under light squeeze will cause the application to pressure normally necessary to cause. load Breakout friction can be reduced leak extrusion By placing the groove in the. by utlizing softer O ring or specially opposite metal part the friction will. modified compounds work against pressure, Running friction depends on two fac One of the best ways to reduce extru. tors the force exerted on the ring s sion is to use the back up ring see. rubbing surface by the compression page 117,force of the squeeze and the force of. the system s pressure against and,tending to distort the O ring into a D. shape The former depends on the,hardness of the O ring its percentage.
squeeze and the length of the rubbing,P Media P Media. Friction Friction, The surface over which the O ring will Movement Movement. slide also becomes very important It Clearance Clearance. must be hard and wear resistant it gap gap,must be sufficiently smooth that it will. not abrade the rubber and yet there Fig 1 32 a Fig 1 32 b. must be minute pockets to hold lubri,TECHNICAL DOCUMENTATION O RINGS. 12 O ring Gland Design, Groove depth and clearance gap Seal Design Mechanical Squeeze for the gland is.
The right groove depth in O ring appli Seals are divided into three primary determined by the bore diameter and. cations is very important because it categories Static Face or Flange the groove diameter in a plug or male. strongly influences the squeeze of the Static Radial type and Dynamic Radial type seal fig 23 The formula for. O ring cross section In the tables the type determining the groove diameter B. groove depth always includes the Face or Flange type seals have no when the bore diameter A and gland. machined groove depth and the clearance gap but consist of a groove depth E are known is. clearance gap The clearance gap cut into one flange with a flat mating. influences the rate of extrusion flange bolted together to give a surface B min A min minus 2 x E max. Because it is very difficult to measure to surface contact B max A max minus 2 x E min. the groove depth it is better to make Static Radial Seals and Dynamic Radial. the calculation with the bore plug and Seals require the presence of a diame Squeeze is measured from the bottom. groove diameter as stated below trical clearance gap for installation of the groove to the mating surface. and includes the clearance gap The, There are two types of radial designs following formula is used to determine. clearance gap 1 Male or Plug the O ring groove is the actual gland depth with tolerances. located on a plug which is inserted into, pressure the housing or cylinder fig 1 23 Max Gland Depth max bore minus. 2 Female or Tube the O ring groove min groove diameter divided by 2. is located in the housing or cylinder Min Gland Depth min bore minus. and a tube is installed through the max groove diameter divided by 2. O ring l D fig 1 24,Male or Plug Seal design is based on. the following factors refer to fig 1 23,Bore Diameter A. Plug Diameter H,Groove Diameter B,Groove Width F as shown in the.
dimension tables,Gland Depth E as shown in the,dimension tables. Break corners app R 005 0 15,A H B Fig 1 23,x surface finish Ra A D H Fig 1 24. groove depth is incl gap,SEALING ELEMENTS,12 O ring Gland Design. Total Diametrical Clearance is the dif Total Diametrical Clearance is the dif. ference between the bore diameter A ference between the bore diameter A. and the plug diameter H dimensions and the plug diameter H Tolerances. Tolerances of the bore and plug of the bore diameter and the plug. diameters determine the maximum and diameter determine the maximum and. minimum diametrical clearance gap minimum total diametrical clearance. These values divided by two will give gap The size of the clearance gap is. the radial maximum and minimum also influenced by the degree of. clearance gaps breathing of the metal parts When,using the values from the tables. Female or Tube seals fig 24 are include in the diametrical clearance. based upon the following any breathing or expansion of the. Bore Diameter A mating metal parts that may be,Plug Diameter H anticipated due to pressure.
Groove Diameter D, Groove Width F as shown in the In some constructions the clearance. dimension tables gap is equal on the whole circumfer. Gland Depth E as shown in the ence of the O ring This is total clear. dimension tables ance with maximum concentricity If. concentricity between piston and, Mechanical Squeeze for this type of cylinder is rigidly maintained radial. seal is determined by the groove clearance is diametrical clearance. diameter D and the plug diameter H In practice in most constructions due. The formula for determining the groove to side loading and misalignment on. diameter D when the plug diameter one spot of the O ring circumference. H and the groove depth E are the clearance gap is minimum or even. known is zero and on the opposite spot it will be, D max H max Plus 2 E max maximum This is total clearance with. D min H min plus 2 E min maximum eccentricity fig 20. Squeeze is measured from the bottom Please contact the local ERIKS. of the groove to the mating surface representative for additional informa. and includes the clearance gap Use tion on wear bands and bearing for. the following formula for determining improving concentricity. the actual gland depth with tolerance,Max Gland Depth. Max groove diameter minus min plug,diameter divided by 2.
Min Gland Depth,Min groove diameter minus max plug. diameter divided by 2 S,total clearance total clearance. with max eccentricity with max concentricity,TECHNICAL DOCUMENTATION O RINGS. 12 O ring Gland Design,The most effective and reliable sealing. is generally provided with the diametri Table 3 B 1a Gland clearance in relation to hardness and O ring cross section. cal clearance as shown in Table 3 B,Cross section Max clearance 70 Shore A.
1a The maximum allowable gaps are,inch mm inch mm,indicated for 70 hardness O rings. 070 1 0 2 0 002 004 0 05 0 1,with different cross sections without. 103 2 0 3 0 002 005 0 05 0 13,back ups for reciprocating and static. 139 3 0 4 0 002 006 0 05 0 15,seals These values correspond to a. 210 4 0 6 0 003 007 0 07 0 18,pressure of ca 1200 PSI 80 bar.
275 6 0 004 010 0 1 0 25,8 Mpa at 70 F 21 C When greater. clearances occur fig 1 21 indicates,conditions where O ring seals may be. used depending on the fluid pressure,and O ring hardness 10 500 700. See Table 3 B 1a,Note for silicone and fluorosilicone 4 500 300. O rings reduce all the clearances 3 000 200,shown by 50 2 000 140.
Pressure psi bar,The diagram fig 1 21 gives a guide 600 40. to the relation between hardness 90 Sh A,pressure clearance and extrusion 70 Sh A. This figure is based on NBR O rings no,with a cross section of 139 inch 3 53 extrusion. mm without back up rings When,there is risk for extrusion use contou. red hard rubber or plastic back up 150 10, rings The results are based on tests at inch 010 020 030 040.
mm 0 25 0 5 0 7 1 0,temperatures up to 70 C,Total Diametral Clearance Gap. SEALING ELEMENTS,12 O ring Gland Design,12 A Gland Design Static Axial. Application, Gland Design for Static Application for Pressure Pressure. outside inside,O rings with Axial Squeeze,Surface Finish X Break corners app R 005 0 15. groove top and bottom,for liquids,X 32 micro inches 0 8 m Ra.
for vacuum and gases,X 16 micro inches 0 4 m Ra,groove sides. X 63 micro inches 1 6 m Ra,x surface finish Ra,groove depth is incl gap. Fig 1 27 a, Table AS C1 Gland Dimensions inches Industrial Face or Flange Type. O ring Gland Depth Static Squeeze Groove Width Groove Radius. Cross section Axial Static In for Face Seals W R,Nominal Actual Actual In Liquids Vacuum Gases. 1 16 070 050 054 013 023 27 101 107 084 089 005 015. 3 32 103 074 080 020 032 21 136 142 120 125 005 015. 1 8 139 101 107 028 042 20 177 187 158 164 010 025. 3 16 210 152 162 043 063 18 270 290 239 244 020 035. 1 4 275 201 211 058 080 16 342 362 309 314 020 035. These dimensions are intended primarily for face type seals and normal temperature applications. TECHNICAL DOCUMENTATION O RINGS,12 O ring Gland Design.
Gland Design for Static Application, Table 3 C 1 Gland Dimensions Static Application Face Seal Glands Metric. for O rings with Axial Squeeze,Face Seal Glands METRIC W E F R. O rings which are compressed axially O ring cross section Gland Depth Groove Width Groove Radius. in a static application are also called Diam Tol Liquids Vacuum. flange seals see fig 26 and 27 mm DIN 3771 Tol 0 Tol 0 0 13 gases. 0 90 0 08 0 68 0 02 1 30 1 10 0 2,1 0 1 02 0 08 0 75 0 02 1 45 1 20 0 2. 1 20 0 08 0 90 0 02 1 75 1 45 0 2,1 25 1 27 0 08 0 94 0 02 1 80 1 50 0 2. 1 42 0 08 1 07 0 02 2 05 1 70 0 2, Surface Finish X 1 50 0 08 1 13 0 02 2 20 1 80 0 2.
groove top and bottom 1 60 1 63 0 08 1 20 0 03 2 35 1 90 0 2. for liquids 1 78 1 80 0 08 1 34 0 03 2 60 2 15 0 2. X 32 micro inches 0 8 m Ra 1 90 0 08 1 43 0 03 2 75 2 30 0 2. 2 0 0 08 1 51 0 04 2 90 2 40 0 2,for vacuum and gases. 2 20 2 21 0 08 1 67 0 04 2 90 2 55 0 2,X 16 micro inches 0 4 m Ra. 2 40 0 08 1 82 0 04 3 20 2 80 0 2,2 46 0 08 1 87 0 04 3 25 2 85 0 2. groove sides 2 50 0 08 1 90 0 04 3 30 2 90 0 2, X 63 micro inches 1 6 m Ra 2 62 0 08 1 99 0 04 3 50 3 05 0 2. 2 70 0 09 2 05 0 04 3 60 3 15 0 2, dimensions in mm US BS standard 2 95 0 09 2 24 0 04 3 90 3 40 0 5.
3 0 0 09 2 27 0 04 3 90 3 45 0 5,3 15 0 09 2 38 0 05 4 15 3 60 0 5. 3 50 3 53 0 09 2 67 0 05 4 60 4 05 0 5,3 60 0 1 2 72 0 05 4 70 4 10 0 5. 4 0 0 1 3 03 0 06 5 25 4 60 0 5,4 50 0 1 3 60 0 06 6 10 5 10 0 5. Pressure Pressure 4 70 0 1 3 76 0 06 6 40 5 35 0 5. outside inside,4 80 0 1 3 84 0 06 6 50 5 45 0 5,5 0 0 10 4 00 0 06 6 80 5 70 0 7. 5 33 5 34 0 13 4 26 0 08 7 25 6 05 0 7,5 50 0 13 4 40 0 08 7 45 6 25 0 7.
5 70 0 13 4 56 0 08 7 75 6 50 0 7,Fig 1 26 5 80 0 13 4 64 0 08 7 90 6 60 0 7. 6 0 0 13 4 98 0 08 7 80 7 75 0 7,6 40 0 13 5 31 0 1 8 30 7 20 0 7. Break corners app R 005 0 15 6 50 0 13 5 40 0 1 8 40 7 30 0 7. 6 90 0 13 5 73 0 1 8 95 7 75 0 7,6 99 0 15 5 80 0 1 9 05 8 85 0 7. 7 0 0 15 5 81 0 1 9 05 7 90 0 7,7 50 0 15 6 23 0 1 9 70 8 40 1 0. 8 0 0 18 6 64 0 1 10 35 9 00 1 0,8 40 0 18 6 97 0 15 10 90 9 45 1 0.
9 0 0 2 7 65 0 15 11 10 10 40 1 0,10 0 0 2 8 50 0 15 12 30 11 55 1 0. 11 0 0 2 9 35 0 15 13 55 12 70 1 0, x surface finish Ra 12 0 0 2 10 20 0 15 14 80 13 85 1 5. groove depth is incl gap 13 0 0 2 11 05 0 15 16 00 15 00 1 5. 14 0 0 2 11 90 0 3 17 25 16 15 1 5,Fig 1 27 a 16 0 0 2 13 60 0 3 19 70 18 45 1 5. 18 0 0 2 15 30 0 3 22 15 20 80 1 5,20 0 0 2 17 00 0 3 24 65 23 10 1 5. SEALING ELEMENTS,12 O ring Gland Design,12 B Gland Design Static Radial.
Application,Gland Design for Static Application,for O rings with Radial Squeeze. Industrial Radial Glands INCHES,Surface Finish X,groove top and bottom. for liquids,Break corners app R 005 0 15,X 32 micro inches 0 8 m Ra. for vacuum and gases,X 16 micro inches 0 4 m Ra,groove sides. X 63 micro inches 1 6 m Ra,x surface finish Ra,groove depth is incl gap.
Fig 1 27 a, Table AS C2 Gland Dimensions Static Seals Industrial Radial Applications Inches. O ring Gland Depth Static Clearance Groove Groove Max. Cross section Radial Static Squeeze for Diametral Width Radius Allowable. W E Radial Seals F R Eccentricity1,Nominal Actual Actual Standard One Two. Backup Backup,Washer2 Washers2, 1 16 070 050 052 015 023 22 32 002 min 093 098 138 143 205 210 005 015 005 015. 3 32 103 081 083 017 025 17 24 002 min 140 145 171 176 238 243 005 015 005 015. 1 8 139 111 113 022 032 16 23 003 min 187 192 208 213 275 280 010 025 010 025. 3 16 210 170 173 032 045 15 21 003 min 281 286 311 316 410 415 020 035 020 035. 1 4 275 226 229 040 055 15 20 004 min 375 380 408 413 538 543 020 035 020 035. 1 Total Indicator Reading between groove and adjacent bearing surface. 2 These groove dimensions are for compounds that free swell less than 15 Suitable allowances should be made for higher swell compounds. For max allowable cleareance refer to fig 22 to determine value based upon pressure requirement and compound hardness. Maximum clearance should be reduced by 1 2 for compounds exhibiting poor strength such as silicone and fluorosilicone. Male plug dimensions and female throat bore dimensions must be calculated based upon maximum and minimum clearance gaps. TECHNICAL DOCUMENTATION O RINGS,12 O ring Gland Design. 12 B Gland Design Static Radial, Table 3 C 2 Gland dimensions Static Application Industrial Radial Seals METRIC.
Application,W E S Diametr F Groove R Groove Max, Gland Design for Static Application O ring cross section Gland Depth Clearance Width Radius Eccentricity. for O rings with Radial Squeeze Diam Tol Tol, Industrial Radial Glands INCHES mm DIN 3771 Tol 0 Tol 0 0 13. 0 90 0 08 0 65 0 02 0 1 1 20 0 2 0 05,1 0 1 02 0 08 0 72 0 02 0 1 1 35 0 2 0 05. Surface Finish X,1 20 0 08 0 87 0 02 0 1 1 60 0 2 0 05. groove top and bottom,1 25 1 27 0 08 0 91 0 02 0 1 1 65 0 2 0 05.
for liquids 1 42 0 08 1 03 0 02 0 1 1 90 0 2 0 05, X 32 micro inches 0 8 m Ra 1 50 0 08 1 09 0 02 0 1 2 00 0 2 0 05. 1 60 1 63 0 08 1 16 0 03 0 1 2 10 0 2 0 05, for vacuum and gases 1 78 1 80 0 08 1 29 0 03 0 1 2 35 0 2 0 05. X 16 micro inches 0 4 m Ra 1 90 0 08 1 38 0 03 0 1 2 50 0 2 0 05. 2 0 0 08 1 45 0 04 0 1 2 65 0 2 0 05,groove sides, X 63 micro inches 1 6 m Ra 2 20 2 21 0 08 1 74 0 04 0 1 3 00 0 2 0 05. 2 40 0 08 1 90 0 04 0 1 3 25 0 2 0 05,2 46 0 08 1 94 0 04 0 1 3 35 0 2 0 05. 2 50 0 08 1 98 0 04 0 1 3 40 0 2 0 05,2 62 0 08 2 07 0 04 0 1 3 55 0 2 0 05.
2 70 0 09 2 13 0 04 0 1 3 65 0 2 0 05,2 95 0 09 2 33 0 04 0 1 4 00 0 5 0 05. 3 0 0 09 2 40 0 04 0 15 4 05 0 5 0 07,3 15 0 09 2 52 0 05 0 15 4 25 0 5 0 07. 3 50 3 53 0 09 2 82 0 05 0 15 4 75 0 5 0 07,3 60 0 1 2 88 0 05 0 15 4 85 0 5 0 07. 4 0 0 1 3 20 0 06 0 15 5 40 0 5 0 07,Fig 1 28 4 50 0 1 3 64 0 06 0 15 6 00 0 5 0 07. 4 70 0 1 3 80 0 06 0 15 6 30 0 5 0 07,4 80 0 1 3 88 0 06 0 15 6 40 0 5 0 07.
5 0 0 1 4 04 0 06 0 15 6 70 0 7 0 10,5 33 5 34 0 13 4 31 0 08 0 15 7 15 0 7 0 10. Break corners app R 005 0 15 5 50 0 13 4 45 0 08 0 15 7 35 0 7 0 10. 5 70 0 13 4 61 0 08 0 15 7 65 0 7 0 10,5 80 0 13 4 69 0 08 0 15 7 75 0 7 0 10. 6 0 0 13 4 91 0 08 0 18 8 15 0 7 0 13,6 40 0 13 5 24 0 1 0 18 8 70 0 7 0 13. 6 50 0 13 5 32 0 1 0 18 8 85 0 7 0 13,6 90 0 13 5 65 0 1 0 18 9 40 0 7 0 13. 6 99 0 15 5 72 0 1 0 18 9 50 0 7 0 13,7 0 0 15 5 73 0 1 0 18 9 55 0 7 0 13.
7 50 0 15 6 14 0 1 0 18 10 20 1 0 0 13, x surface finish Ra 8 0 0 18 6 55 0 1 0 18 10 90 1 0 0 13. groove depth is incl gap 8 40 0 18 6 87 0 15 0 18 11 45 1 0 0 13. Fig 1 27 a 9 0 0 2 7 65 0 15 0 18 11 85 1 0 0 13,10 0 0 2 8 50 0 15 0 18 13 20 1 0 0 13. 11 0 0 2 9 35 0 15 0 18 14 50 1 0 0 13,12 0 0 2 10 20 0 15 0 18 15 85 1 0 0 13. 13 0 0 2 11 05 0 15 0 18 17 15 1 5 0 13,14 0 0 2 11 90 0 3 0 18 18 45 1 5 0 13. 16 0 0 2 13 60 0 3 0 18 21 10 1 5 0 13,18 0 0 2 15 30 0 3 0 18 23 75 1 5 0 13.
20 0 0 2 17 00 0 3 0 18 26 40 1 5 0 13,SEALING ELEMENTS. 12 O ring Gland Design,12 C Gland Design Dovetail Grooves. Gland Design for a Static,Application for O rings in Dovetail. Grooves INCHES,Dovetail grooves are used to hold the. O ring in place during installation or x surface finish in Ra. maintenance This groove design is Fig 1 30,relatively uncommon as it is expensive.
to machine and should not be used,unless absolutely required. The dovetail groove construction is,only recommended for O rings with. cross sections of 139 inch Table AS C3 Gland Dimensions Dovetail Grooves INCHES. 3 53 mm and larger, O ring Gland Depth Squeeze Groove Width Groove Radius. Cross section to Sharp Corner,Surface Finish X W E F2. groove top and bottom 1 16 070 050 052 27 055 059 005 015. for liquids 3 32 103 081 083 21 083 087 010 015, X 32 micro inches 0 8 m Ra 1 8 139 111 113 20 113 117 010 030.
3 16 210 171 173 18 171 175 015 030, for vacuum and gases 1 4 275 231 234 16 231 235 015 060. X 16 micro inches 0 4 m Ra 3 8 375 315 319 16 315 319 020 090. Radius R2 is critical Insufficient radius will cause damage to the seal during installation. groove sides while excessive radius may contribute to extrusion R2 is size radius R1 is machining radius. X 63 micro inches 1 6 m Ra,TECHNICAL DOCUMENTATION O RINGS. 12 O ring Gland Design,12 C Gland Design Dovetail Grooves. Table 3 C 3 Gland Dimensions Dovetail Grooves METRIC. Gland Design for a Static W E F R, Application for O rings in Dovetail Cross section Groove Depth Groove Width Radius. Grooves METRIC mm E 0 0 05 F2 0 05 F1 0 05 R1 R2,3 0 2 40 2 45 2 60 0 4 0 25.
Dovetail grooves are used to hold the 3 5 3 53 2 80 2 80 3 05 0 8 0 25. O ring in place during installation or, maintenance This groove design is 4 0 3 20 3 10 3 40 0 8 0 25. relatively uncommon as it is expensive 4 5 3 65 3 50 3 75 0 8 0 25. to machine and should not be used, unless absolutely required 5 0 4 15 3 85 4 10 0 8 0 25. The dovetail groove construction is 5 33 4 40 4 10 4 35 0 8 0 25. only recommended for O rings with 5 5 4 6 4 20 4 60 0 8 0 4. bigger cross sections 139 inch 5 7 4 8 4 35 4 75 0 8 0 4. 3 53 mm and bigger,6 0 5 05 4 55 4 95 0 8 0 4,6 5 5 50 4 90 5 30 0 8 0 4. Surface Finish X 6 99 7 0 5 95 5 25 5 65 1 5 0 4,groove top and bottom. for liquids 7 5 6 40 5 60 6 00 1 5 0 4,X 32 micro inches 0 8 m Ra.
8 0 6 85 6 00 6 50 1 5 0 5,for vacuum and gases 8 4 7 25 6 25 6 80 1 5 0 5. X 16 micro inches 0 4 m Ra 8 5 7 35 6 35 6 90 1 5 0 5. groove sides 9 0 7 80 6 70 7 25 1 5 0 5, X 63 micro inches 1 6 m Ra 9 5 8 20 7 05 7 60 1 5 0 5. 10 0 8 70 7 40 7 95 1 5 0 5,Dimensions in mm US BS standard AS 568A. Radius R2 is critical Insufficient radius will cause damage to the seal during installation. while excessive radius may contribute to extrusion. R2 is size radius R1 is machining radius, F1 is groove width to sharp corner F2 is groove width to round corner. x surface finish in Ra,SEALING ELEMENTS,12 O ring Gland Design.
12 D Gland Design for Static Boss Seals,Q FULL THREADS DIAMETER D SHOULD BE CON. CHAMFER RELIEF TO TO THIS POINT CENTRIC WITH THREAD P D. O ring boss Gaskets for Straight HEX FLATS SHOULD 45 5 WITHIN 005 F I R. Thread Tube Fittings BE WITHIN THE15 MIN BOSS,5 ANGLE AND E THREAD J HEIGHT. DIA LIMITATIONS 005 45 5,The 900 series of dash numbers iden U DIA. tify the size of boss seals The digits DETAIL,after the 9 identify the nominal tube. size in 16ths of an inch The tube size DETAIL,is the outside diameter OD For exa Z A.
015 RAD FOR MIN K D DIA,SQUARENESS BETWEEN, mple size 903 is intended for use with THREAD AND FACE OF HEX 031. THREAD RUNOUT SPOT THD THIS DIM APPLIES, 3 16 inch OD tube SHOULD NOT EXCEED H 016 FACE P ONLY WHEN TAP. WHEN MEASURED AT DIA DIAMETER DRILL CAN NOT PASS,METER E THRU ENTIRE BOSS. Boss Dimensions,AS 568 Cross I D Tube Thread J D U K Y P Z 0. O ring section Outside min min 005 015 min min 1 min. Size Nr THD 000 000, 902 064 003 239 005 1 8 5 16 24 UNF 2B 390 062 358 074 672 468 12 438.
903 064 003 301 005 3 16 3 8 24 UNF 2B 390 125 421 074 750 468 12 500. 904 072 003 351 005 1 4 7 16 20 UNF 2B 454 172 487 093 828 547 12 563. 905 072 003 414 005 5 16 1 2 20 UNF 2B 454 234 550 093 906 547 12 625. 906 078 003 468 005 3 8 9 16 20 UNF 2B 500 297 616 097 909 609 12 688. 908 087 003 644 009 1 2 3 4 16 UNF 2B 562 391 811 100 1 188 688 15 875. 910 097 003 755 009 5 8 7 8 14 UNF 2B 656 484 942 100 1 344 781 15 1 000. 912 116 004 924 009 3 4 1 1 16 12 UN 2B 750 609 1 148 130 1 625 906 15 1 250. 913 116 004 986 010 13 16, 914 116 004 1 047 010 7 8 1 3 16 12 UN 2B 750 719 1 273 130 1 765 906 15 1 375. 916 116 004 1 171 010 1 1 5 16 12 UN 2B 750 844 1 398 130 1 910 906 15 1 500. 920 118 004 1 475 014 1 1 4 1 5 8 12 UN 2B 750 1 078 1 713 132 2 270 906 15 1 875. 924 118 004 1 720 014 1 1 2 1 7 8 12 UN 2B 750 1 312 1 962 132 2 560 906 15 2 125. 932 118 004 2 337 018 2 2 1 2 12 UN 2B 750 1 781 2 587 132 3 480 906 15 2 750. Fitting End Dimensions MS33656,O ring Cross I D Tube Thread F D U K. Size Nr section Outside 002 max 010 015, AS 902 064 003 239 005 1 8 5 16 24 UNF 2B 250 005 549 063. AS 903 064 003 301 005 3 16 3 8 24 UNF 2B 312 005 611 063. AS 904 072 003 351 005 1 4 7 16 20 UNF 2B 364 005 674 075. AS 905 072 003 414 005 5 16 1 2 20 UNF 2B 426 005 736 075. AS 906 078 003 468 005 3 8 9 16 18 UNF 2B 481 005 799 083. AS 908 087 003 644 009 1 2 3 4 16 UNF 2B 660 005 986 094. AS 910 097 003 755 009 5 8 7 8 14 UNF 2B 773 005 1 111 107. AS 912 116 004 924 009 3 4 1 1 16 12 UN 2B 945 008 1 361 125. AS 914 116 004 1 047 010 7 8 1 3 16 12 UN 2B 1 070 008 1 475 125. AS 916 116 004 1 171 010 1 1 5 16 12 UN 2B 1 195 008 1 599 125. AS 920 118 004 1 475 014 1 1 4 1 5 8 12 UN 2B 1 507 008 1 849 125. AS 924 118 004 1 720 014 1 1 2 1 7 8 12 UN 2B 1 756 008 2 095 125. AS 932 118 004 2 337 018 2 2 1 2 12 UN 2B 2 381 008 2 718 125. TECHNICAL DOCUMENTATION O RINGS,12 O ring Gland Design. 12 E Gland Design Dynamic Hydraulic Break corners app R 005 0 15. Gland Design for Dynamic,Application Hydraulic,The following table indicates groove.
dimensions for reciprocating and oscil,lating applications when sealing. hydraulic fluids and other viscous,liquids x surface finish Ra. groove depth is incl gap,Surface Finish X,groove top and bottom. Fig 1 33 34 Fig 1 27,X 16 micro inches 0 4 m Ra,groove sides. X 32 micro inches 0 8 m Ra, Table AS D1 Gland Dimensions Dynamic Seals Industrial Reciprocating Applications Inches.
O ring Gland Depth Dynamic Clearance Groove Groove Max. Cross section Radial Dynamic Squeeze for Diametral Width Radius Allowable. W E Radial Seals F R Eccentricity1,Nominal Actual Actual Standard One Two. Backup Backup,Ring2 Rings2, 1 16 070 055 057 010 018 15 25 002 min 093 098 138 143 205 210 005 015 002. 3 32 103 088 090 010 018 10 17 002 min 140 145 171 176 238 243 005 015 002. 1 8 139 121 123 012 022 9 16 003 min 187 192 208 213 275 280 010 025 003. 3 16 210 185 188 017 030 8 14 003 min 281 286 311 316 410 415 020 035 004. 1 4 275 237 240 029 044 11 16 004 min 375 380 408 413 538 543 020 035 005. 1 Total Indicator Reading between groove and adjacent bearing surface. 2 These groove widths are for compounds that free swell less than 15 Suitable allowances should be made for higher swell compounds. Groove width is based on rubber backups For groove width with pdfe spiral wound backups see table 3 D 2. For max allowable cleareance refer to table 13 A to determine value based upon pressure requirement and compound durometer. The piston dimension for male glands must be calculated by using the max gap derived from the extrusion table 13 A and the min gap listed above. The bore diameter for female glands must be calculated by using the max gap derived from the extrusion table 13 A and the min gap listed above. SEALING ELEMENTS,12 O ring Gland Design,12 E Gland Design Dynamic Hydraulic. Table 3 D 1 Gland Dimensions Dynamic Application Industrial Reciprocating Seals METRIC. Gland Design for Dynamic W E S Diametr F Groove R Groove Max. Application Hydraulic O ring cross section Gland Depth Clearance Width Radius Eccentricity. METRIC Diam Tol Tol,DIN 3771 in mm Tol 0 0 13, The following table indicates groove 0 90 0 08 0 72 0 02 0 1 1 20 0 2 0 05. dimensions for reciprocating and oscil 1 0 1 02 0 08 0 80 0 02 0 1 1 35 0 2 0 05. lating applications when sealing 1 20 0 08 0 96 0 02 0 1 1 60 0 2 0 05. hydraulic fluids and other viscous 1 25 1 27 0 08 1 00 0 02 0 1 1 70 0 2 0 05. liquids 1 42 0 08 1 13 0 02 0 1 1 90 0 2 0 05,1 50 0 08 1 20 0 02 0 1 2 00 0 2 0 05.
1 60 1 63 0 08 1 28 0 03 0 1 2 10 0 2 0 05,Surface Finish X. 1 78 1 80 0 08 1 42 0 03 0 1 2 40 0 2 0 05,groove top and bottom. 1 90 0 08 1 52 0 03 0 1 2 50 0 2 0 05,X 16 micro inches 0 4 m Ra. 2 0 0 08 1 60 0 04 0 1 2 65 0 2 0 05,groove sides,2 20 2 21 0 08 1 89 0 04 0 1 3 00 0 2 0 05. X 32 micro inches 0 8 m Ra 2 40 0 08 2 06 0 04 0 1 3 25 0 2 0 05. 2 46 0 08 2 11 0 04 0 1 3 35 0 2 0 05,2 50 0 08 2 15 0 04 0 1 3 40 0 2 0 05.
2 62 0 08 2 25 0 04 0 1 3 55 0 2 0 05,2 70 0 09 2 32 0 04 0 1 3 70 0 2 0 05. 2 95 0 09 2 53 0 04 0 1 4 00 0 5 0 05,3 0 0 09 2 61 0 04 0 15 4 05 0 5 0 07. 3 15 0 09 2 74 0 05 0 15 4 25 0 5 0 07,3 50 3 53 0 09 3 07 0 05 0 15 4 75 0 5 0 07. 3 60 0 1 3 13 0 05 0 15 4 85 0 5 0 07,4 0 0 1 3 48 0 05 0 15 5 40 0 5 0 07. 4 50 0 1 3 99 0 05 0 15 6 00 0 5 0 07,4 70 0 1 4 17 0 05 0 15 6 30 0 5 0 07.
4 80 0 1 4 26 0 05 0 15 6 40 0 5 0 07,Fig 1 33 34 5 0 0 1 4 44 0 05 0 15 6 70 0 7 0 10. 5 33 5 34 0 13 4 73 0 05 0 15 7 15 0 7 0 10,5 50 0 13 4 88 0 05 0 15 7 40 0 7 0 10. 5 70 0 13 5 06 0 05 0 15 7 60 0 7 0 10,Break corners app R 005 0 15. 5 80 0 13 5 15 0 05 0 15 7 75 0 7 0 10,6 0 0 13 5 19 0 05 0 18 8 15 0 7 0 13. 6 40 0 13 5 54 0 05 0 18 8 70 0 7 0 13,6 50 0 13 5 63 0 05 0 18 8 85 0 7 0 13.
6 90 0 13 5 97 0 05 0 18 9 40 0 7 0 13,6 99 0 15 6 05 0 05 0 18 9 50 0 7 0 13. 7 0 0 15 6 06 0 05 0 18 9 55 0 7 0 13,7 50 0 15 6 49 0 05 0 18 10 20 1 0 0 13. 8 0 0 18 6 92 0 05 0 18 10 90 1 0 0 13, x surface finish Ra 8 40 0 18 7 27 0 05 0 18 11 45 1 0 0 13. groove depth is incl gap,9 0 0 2 7 92 0 05 0 18 12 10 1 0 0 13. 10 0 0 2 8 80 0 05 0 18 13 40 1 0 0 13,US BS Standard AS 568A.
For groove width with back up rings for O rings AS 568A see table 3 D 2 For groove width. with back up rings for metric O rings ask for more information.

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