36 F astening 1 T ypes of Screws Many types of screws are available and are selected depending on the application and material In addition thread geometry insertion speed and head imprint also infuence the choice of the bits and the screwdrivers SC r EWD r IVE r SELECTION TH e MAI n SCR e WS TYP e S AR e TH e TYP e of IMPRI n T MA Y B e M e TRIC Generally used with nuts and threaded holes SL o TT e D Mainly used in the wood eyeglasses electronics sectors etc S e L f THR e ADI ng These form the thread and tighten at the same time The thread is created by deformation of the material making this kind of screw particularly suitable for plastic wood and other lightweight materials CR o SSSL o TT e D PHILIPSP o ZIDRI ve Used on plastic sheet metal and wood the cross slot improves the connection between screw and screwdriver S e L f T APPI ng These are metric screws with special grooves on their threaded shanks which allow the shavings created during tightening to be removed T o RX This transmits higher torque levels with lower axial thrust The imprint of fers a larger surface contact and ef fective connection with minimum clearance THR ee L o B e These are metric screws that tap through the special lobe shape of the shank thereby deforming the material rather than removing it H e X S o C ke T SCR e W Allen screw Normally with metric pitch it can be used in small spaces S e L f DRILLI ng These are selfthreading screws with a special drill tip that makes the hole during drilling H e X H e AD Used in many sectors both in the metric and in the selfthreading and selfdrilling versions etc Particu larly ef fective for high tightening torque levels TH e SCR e WS CA n B e f ITT e D WITH B u IL T I n f LA T W ASH e R This improves the quality of tightening and makes tightening cycle times quicker knu RL e D W ASH e R un D e R TH e H e AD Fixed or mobile it reduces the chances of the screw from accidentally loosening THR e AD fo RMI ng R o LLI ng SCR e WS g RAD e S 46 58 88 109 129 88 THR e AD SIZ e R e C o MM en D e D T o RQ ue n m M16 007 012 019 M2 015 024 038 05 M22 019 031 051 M25 028 048 077 M3 051 085 14 19 23 14 M35 08 134 22 30 36 M4 12 20 32 45 54 32 M5 24 40 64 90 107 65 M6 41 68 109 153 183 11 M8 98 163 261 368 441 26 M10 193 322 515 72 869 52 M12 336 56 90 126 151 91 2 Screws Selection Charts IS o MACHI ne SCR e WS R e C o MM en D e D T o RQ ue n m THR e AD SIZ e In n m Ibf ft n m Ibf ft n m Ibf ft 14 54 40 10 76 11 82 516 1 12 83 21 157 23 170 38 200 147 38 279 41 302 716 320 235 61 448 85 483 12 488 360 93 684 100 738 For non metric threads please use the following data as a guide Q u ALITY P Q u ALITY S Q u ALITY T Fastener T orque V alues for metric screws 3 Screwdrivers T orque and Speed range rpm C u SHI on CP780 1800 TRI gge R C u SHI on CP781 800 TRI gge R C u SHI on CP782 1800 L eve R C u SHI on CP783 2000 L eve R C u SHI on CP201 1 1470 L eve R C u SHI on CP2009 11 10 L eve R C u SHI on CP2623 1700 L eve R C u SHI on CP2006 1100 TRI gge R C u SHI on CP2612 1700 TRI gge R SH u T off CP2005 1100 TRI gge R SH u T off CP261 1 1000 TRI gge R SH u T off CP2010 1100 P u SH SH u T off CP2003 1100 P u SH SH u T off CP2007 1100 P u SH SH u T off CP2008 1100 L eve R SH u T off CP2622 1700 P u SH SH u T off CP2621 1000 P u SH 44 88 18 30 35 44 53 62 71 80 05 10 20 30 40 50 60 70 80 90 STRAI g HT o R PIST o L TYP e of CL u TCH M o D e L T o RQ ue RA nge inlbs n m f R ee SP ee D ST ART rpm IMP ACT CP2036 10000 L eve R IMP ACT CP2037 10000 L eve R IMP ACT CP2041 15000 L eve R IMP ACT CP2042 5600 TRI gge R DIR e CT CP2754 1450 TRI gge R DIR e CT CP2755 2200 TRI gge R DIR e CT CP2764 600 TRI gge R DIR e CT CP2765 900 TRI gge R P o SITI ve CP2780 2100 TRI gge R 18 35 53 71 88 106 124 142 159 177 195 212 230 246 264 281 299 317 334 352 370 20 40 60 80 100 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42