655 FRANCEJOINT | Alldatasheet
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QUALITY & EXPERTISE FOR YOUR SEALING NEEDS DESCRIPTION The BECA 655 profile is a double acting composite piston seal composed of a flexible rubber ring and a polyamide friction ring with a step cut. ADVANTAGES The square ring does not twist Low friction coefficient Excellent extrusion resistance Compatible with hydraulic oils APPLICATIONS Agriculture Mobile machinery Hydraulic cylinders MATERIALS Friction ring Polyamide PA6 Polyoxymethylene (POM) Profiled seal NBR 70 Shore A Other grades of materials are available. Please contact our experts. TECHNICAL DATA Temperature -30°C / +100°C Pressure 50 MPa Speed 0.5 m/sec Media Mineral hydraulic oils Fire-resistant liquids Biocompatible fluids Water Others (contact our experts) The figures above indicate the maximum values and may not be cumulated. They may be developed, depending on the materials used. EXTRUSION GAPS Pressure MPa Radial gap F/2 20 MPa 0.25 35 MPa 0.20 40 MPa 0.15 50 MPa 0.10 SURFACE ROUGHNESS Roughness Dynamic surface area Static surface area Groove flanks Ra 0.05 - 0.2 µm ≤1.6 µm ≤3.2 µm Rz 0.4 - 1.6 µm ≤6.3 µm ≤10.0 µm Rmax 0.63 - 2.5 µm ≤10.0 µm ≤16.0 µm CHAMFERS AND RADIUS Radial section S Radius Radius Chamfer C 5.50 0.30 0.50 3.00 7.75 0.30 0.90 4.00 10.50 0.30 0.90 5.00 PISTON SEALS BECA 655 HYDRAULIC SEALS | PISTON SEALS | BECA 655
FRANCE JOINT SAS Zone Artisanale Le Mortier - B.P . 50009 - Cugand - 85613 Montaigu Cedex - France Ph. +33 (0)2 51 42 13 76 - Fax +33 (0)2 51 43 61 14 - Email: contact@francejoint.fr - Website: www.francejoint.com ØD1 SØd1 20/30° C F_2 INSTALLATION DIMENSIONS Groove diameter Ød1 h9 Groove width L1 0/+0.20 Radial section S D1 - 11.00 4.20 5.50 D1 - 15.50 6.30 7.75 D1 - 21.00 8.10 10.50 For special applications > 40 MPa, we recommend using an H8/f8 tolerance (bore/piston) or selecting other, more suitable materials. Please contact our experts. EXAMPLE OF CODIFICATION STANDARD CODIFICATION Materials ________ : Polyoxymethylene (POM) friction ring - Code HC Bore diameter ____ : ØD1 = 100.00 mm Groove diameter __ : Ød1 + 79.00 mm Part number ______: 655.100HCK6 Family Bore diameter Friction ring material Profiled seal material 655. 100 HC K6Part number - DIMENSIONS Part number Bore diameter ØD1 H9 Groove diameter Ød1 h9 Groove width L1 0/+0.10 655.070 70.00 49.00 8.10 655.115 115.00 94.00 8.10 655.120 120.00 99.00 8.10 655.125 125.00 104.00 8.10 655.130 130.00 109.00 8.10 655.140 140.00 119.00 8.10 655.150 150.00 129.00 8.10 655.160 160.00 139.00 8.10 655.170 170.00 149.00 8.10 655.180 180.00 159.00 8.10 Part number Bore diameter ØD1 H9 Groove diameter Ød1 h9 Groove width L1 0/+0.10 655.190 190.00 169.00 8.10 655.075 75.00 54.00 8.10 655.080 80.00 59.00 8.10 655.085 85.00 64.00 8.10 655.090 90.00 69.00 8.10 655.095 95.00 74.00 8.10 655.100 100.00 79.00 8.10 655.105 105.00 84.00 8.10 655.110 110.00 89.00 8.10 The figures highlighted in bold correspond to the bore diameters that are recommended by standard ISO 3320. Other intermediate sizes can be provided. HYDRAULIC SEALS | PISTON SEALS | BECA 655