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Hydraulic seals SKF mobile apps Apple App Store SKF mobile apps are available from both Apple App Store and Google Play. These apps provide useful information and allow you to make critical calculations, providing SKF Knowledge Engineering at your fingertips. Register your catalogue You can get updates for this catalogue via email if you register at skf.com/catalogues. Google Play ® SKF, ECOPUR, H-ECOPUR, S-ECOPUR, X-ECOPUR, XH-ECOPUR, FLUOROTREL, LUBRITHANE, SEAL JET, SPECTRASEAL, TEFLATHANE and X-SLIDE are registered trademarks of the SKF Group. Apple is a trademark of Apple Inc., registered in the US and other countries. Google Play is a trademark of Google Inc. © SKF Group 2014 The contents of this publication are the copyright of the pub- lisher and may not be reproduced (even extracts) unless prior written permission is granted. Every care has been taken to en- sure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the in- formation contained herein. PUB SE/P1 12393/2 EN · August 2014 This publication supersedes publication 5397. Certain image(s) used under license from Shutterstock.com SKF hydraulic seals – general technical information .. 21 1 Piston seals ................................... 45 2 Rod and buffer seals ............................ 111 3 Wiper seals .................................... 207 4 Guide rings and guide strips ...................... 249 5 O-rings and back-up rings ....................... 291 6 Other fluid power applications .................... 347 7 Product index .................................. 352 8 1 Content Unit conversions ............................................................. 4 Foreword ................................................................... 5 This is SKF .................................................................. 8 SKF – the knowledge engineering company ...................................... 10 Introduction to fluid power .................................................... 12 Hydraulic cylinders .......................................................... 13 Cylinder classification. 14 Hydraulic seals and guides .................................................... 14 SKF hydraulic seals and guides capabilities ...................................... 16 Customized sealing solutions ............................................... 16 SKF SEAL JET system ..................................................... 17 Criteria for seal selection ..................................................... 18 1 SKF hydraulic seals – general technical information ............................ 21 Specifications for effective sealing systems ...................................... 22 Gap extrusion ............................................................. 34 Storage .................................................................. 36 Installation and assembly .................................................... 38 2 Piston seals ............................................................... 45 Product tables 2.1 MPV, metric sizes ...................................................... 59 2.2 DPV, inch sizes ........................................................ 61 2.3 LPV, metric sizes ....................................................... 63 2.4 CPV, inch sizes ......................................................... 65 2.5 GH, metric sizes ....................................................... 67 GH, inch sizes ......................................................... 70 2.6 APR, metric sizes ...................................................... 77 APR, inch sizes ........................................................ 79 2.7 LCP, metric sizes ....................................................... 83 LCP, inch sizes ......................................................... 85 2.8 LTP, inch sizes ......................................................... 87 2.9 CUT, metric sizes ...................................................... 91 2.10 SCP, inch sizes ......................................................... 95 2.11 MD-L, metric sizes ..................................................... 99 2.12 UNP, metric sizes ...................................................... 103 UNP, inch sizes ........................................................ 105 2 3 Rod and buffer seals ....................................................... 111 Product tables 3.1 S1S, metric sizes ...................................................... 123 3.2 ZBR, metric sizes ...................................................... 127 ZBR, inch sizes ........................................................ 131 3.3 SIL, metric sizes ....................................................... 135 3.4 PTB, metric sizes ...................................................... 139 PTB, inch sizes ........................................................ 149 3.5 STD, inch sizes ........................................................ 165 3.6 DZ, metric sizes ....................................................... 179 DZ, inch sizes ......................................................... 180 3.7 DZR, metric sizes ...................................................... 185 DZR, inch sizes ........................................................ 186 3.8 RBB, metric sizes ...................................................... 189 RBB, inch sizes ........................................................ 191 3.9 S9B, metric sizes ...................................................... 193 S9B, inch sizes ........................................................ 196 3.10 RSB, inch sizes ........................................................ 199 4 Wiper seals ............................................................... 207 Product tables 4.1 PA, metric sizes ....................................................... 217 4.2 MCW, metric sizes ..................................................... 221 MCW, inch sizes ....................................................... 223 4.3 PAD and PADV, metric sizes ............................................. 227 4.4 DTW, metric sizes ..................................................... 229 DTW, inch sizes ....................................................... 232 4.5 DX, inch sizes ......................................................... 237 4.6 HW, metric sizes ...................................................... 241 HW, inch sizes ........................................................ 243 5 Guide rings and guide strips ................................................. 249 Product tables 5.1 WAT rod or piston guide rings, metric sizes ................................. 256 5.2 WAT rod or piston guide rings, inch sizes ................................... 262 5.3 RGR rod guide rings, metric sizes ......................................... 276 5.4 PGR piston guide rings, metric sizes ....................................... 280 6 O-rings and back-up rings .................................................. 291 Product tables 6.1 OR O-rings in static radial sealing, metric sizes .............................. 300 6.2 OR O-rings in static radial sealing, inch sizes ................................ 316 6.3 STR Back-up rings in static radial sealing, metric sizes ........................ 324 6.4 STR Back-up rings in static radial sealing, inch sizes by dash-number, metric dimensions ..................................................... 328 6.5 STR Back-up rings in static radial sealing, inch sizes by dash-number ........... 338 7 Other fluid power applications ............................................... 347 8 Product index ............................................................. 352 3 Unit conversions Unit conversions Quantity Unit Conversion Length inch 1 mm 0.03937 in. 1 in. 25,40 mm foot 1 m 3.281 ft. 1 ft. 0,3048 m yard 1 m 1.094 yd. 1 yd. 0,9144 m mile 1 km 0.6214 mi. 1 mi. 1,609 km Speed, foot per second 1 m/s 3.28 ft/s 1 ft/s 0,30480 m/s velocity foot per minute 1 m/s 196.8504 ft/min 1 ft/min 0,00508 m/s mile per hour 1 km/h 0.6214 mph 1 mph 1,609 km/h Force pound-force 1 N 0.225 lbf. 1 lbf. 4,4482 N Pressure, pounds per square inch 1 MPa 145 psi 1 psi 6,8948 ¥ 103 Pa stress 1 N/mm2 145 psi 1 bar 14.5 psi 1 psi 0,068948 bar Temperature degree Celsius tC = 0.555 (tF – 32) Fahrenheit tF = 1,8 tC + 32 4 Foreword This catalogue contains the standard assort- Guidance values ment of SKF hydraulic seals and guides typic- Since several factors simultaneously affect ally used in hydraulic cylinders. To provide the the sealing system and seal performance, all highest levels of quality and customer service, stated values in graphs and tables in this pub- these products are available worldwide lication should be considered as guidelines through SKF sales channels. For information only and not as absolute values for practical about lead times and deliveries, contact your applications. local SKF representative or SKF Authorized Distributor. This catalogue reflects SKF’s state-of-the- art technology and production capabilities as of 2014. The data contained within may differ from that shown in earlier catalogues because of redesign, technological developments, or revised calculation methods. SKF reserves the right to continuously improve its products with respect to materials, design and manufactur- ing methods, some of which are driven by technological developments. Getting started Introduction to fluid power provides an over- view over hydraulic
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