Focus Presicion Electron Co., Ltd is a Focus Presicion Electron Co., Ltd based in Wujiang , China. Focus Presicion Electron Co., Ltd is a member of exporthub.com since July, 2009. Our business is related to Electrical & Electronics Supplies industry and we specifically deal in spring. Please find our product details below:extension springEach ring is coiled tightly. Either end is surrounded by a loop so as to be drawn out under pressure. Listed below is the specification of compression spring:¼ˆ1¼‰ Solid height:¼ˆa¼‰total height¼ˆb¼‰total coil height¼ˆc¼‰height of auto-hook coil.¼ˆ2¼‰ Controlling diameter¼ˆa¼‰outer diameter¼ˆb¼‰inner diameter¼ˆc¼‰inner diameter of the tube.¼ˆ3¼‰ “Wire diameter” of the steel wire.¼ˆ4¼‰ Material (category & grade).¼ˆ5¼‰ Coil number:¼ˆa¼‰total coils;¼ˆb¼‰left wind or right wind.¼ˆ6¼‰ Style of ends.¼ˆ7¼‰ Load within the hook. ¼ˆ8¼‰ Load ratio, deflection, pound per inch.¼ˆ9¼‰ Maximum extension height. Extension Spring is a typical model. It can be designed into cylinder shape, various deformations and hooks. Extension Spring is the reversed application of compression spring. The application range is identical but operation control is higher than compression springextension springEach ring is coiled tightly. Either end is surrounded by a loop so as to be drawn out under pressure. Listed below is the specification of compression spring:（1） Solid height:（a）total height（b）total coil height（c）height of auto-hook coil.（2） Controlling diameter（a）outer diameter（