AMF Catalogue Hydraulic clamping systems Page 44
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hollow rod Cylinder No. 6920 Hollow Rod Cylinder single acting, spring return, max. operating pressure 400 bar. CAD Article no. push-pull force at 100 bar [kN] push-pull force at 400 bar [kN] Stroke H Vol. effective piston area [mm] [cm³] [cm²] [N] [g] 64998 6920-20 5,0 20 8 4 4,9 200 930 63016 6920-32 8,0 32 10 8 8,0 350 1730 65011 6920-50 12,5 50 12 15 12,8 540 1650 63057 6920-80 20,0 80 15 30 20,0 750 3850 65003 6920-125 32,0 125 20 64 32,8 1120 6250 Order no. Spring force min. Weight Design: Cylinder barrel from steel, burnished. Piston and piston rod case hardened and ground. Built-in return spring. With sintered bronze filter. 2 wipers and vent screw. Oil supply via threaded port. Application: Particularly suitable for retrofitting existing fixtures for hydraulic actuation. When workpieces are clamped onto a machine tool table, the hollow rod cylinder can be fitted over the clamp bolt instead of the nut. The hollow rod cylinders can be used for push or pull applications. Features: Completely sealed against contamination and chips by means of sinter metal breather and two wipers. Piston can be moved to its end stop. Oil connection at both ends, thus easy lining up in series. Note: Cylinders are designed for use in combination with tempered bolts, material grade 8.8, e. g. DIN 787 and DIN 6379. Bolts matching the hole are recommended. For single acting cylinders there is risk of sucking in coolant during the return stroke. In this case the cylinders have to be protected against the direct effect of coolant. The sinter metal breather should be protected. Dimensions: Article no. Piston dia. [mm] A dia. D dia. F K L dia. M dia. N R 64998 6920-20 32 80 52 40 56,0 82 12,5 20 G1/8 63016 6920-32 40 90 60 44 60,5 94 14,5 24 G1/8 65011 6920-50 48 101 70 50 71,5 103 18,5 26 G1/8 63057 6920-80 60 115 80 60 87,0 119 22,5 32 G1/4 65003 6920-125 75 149 100 75 108,0 151 27,5 38 G1/4 Order no. Hollow rod cylinder no. 6920-50 in milling device for link lever. Subject to technical alterations. 44 Hydraulic clamping systems ANDREAS MAIER GmbH & Co. kg ∙ Phone: +49 711 5766-196 ∙ Web: www.amf.de
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