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, eye-glasses, 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 SS-SL o TT e D (PHILIPS-P 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 self-threading 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 self-threading and self-drilling 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 4.6 5.8 8.8 10.9 12.9 8.8 THR e AD SIZ e R e C o MM en D e D T o RQ ue ( n m) M1.6 0.07 0.12 0.19 - - - M2 0.15 0.24 0.38 - - 0.5 M2.2 0.19 0.31 0.51 - - - M2.5 0.28 0.48 0.77 - - - M3 0.51 0.85 1.4 1.9 2.3 1.4 M3.5 0.8 1.34 2.2 3.0 3.6 - M4 1.2 2.0 3.2 4.5 5.4 3.2 M5 2.4 4.0 6,4 9.0 10.7 6.5 M6 4.1 6.8 10.9 15.3 18.3 11 M8 9.8 16.3 26.1 36.8 44.1 26 M10 19.3 32.2 51.5 72 86.9 52 M12 33.6 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 1/4 5.4 4.0 10 7.6 11 8,2 5/16 1 1.2 8.3 21 15.7 23 17.0 3/8 20.0 14.7 38 27.9 41 30.2 7/16 32.0 23.5 61 44.8 85 48.3 1/2 48.8 36.0 93 68.4 100 73.8 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 1,800 TRI gge R C u SHI on CP781 800 TRI gge R C u SHI on CP782 1,800 L eve R C u SHI on CP783 2,000 L eve R C u SHI on CP201 1 1,470 L eve R C u SHI on CP2009 1,1 10 L eve R C u SHI on CP2623 1,700 L eve R C u SHI on CP2006 1,100 TRI gge R C u SHI on CP2612 1,700 TRI gge R SH u T - off CP2005 1,100 TRI gge R SH u T - off CP261 1 1,000 TRI gge R SH u T - off CP2010 1,100 P u SH SH u T - off CP2003 1,100 P u SH SH u T - off CP2007 1,100 P u SH SH u T - off CP2008 1,100 L eve R SH u T - off CP2622 1,700 P u SH SH u T - off CP2621 1,000 P u SH 4.4 8.8 18 30 35 44 53 62 71 80 (0.5) (1.0) (2.0) (3.0) (4.0) (5.0) (6.0) (7.0) (8.0) (9.0) 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 in.lbs ( n m) f R ee SP ee D ST ART rpm IMP ACT CP2036 10,000 L eve R IMP ACT CP2037 10,000 L eve R IMP ACT CP2041 15,000 L eve R IMP ACT CP2042 5,600 TRI gge R DIR e CT CP2754 1,450 TRI gge R DIR e CT CP2755 2,200 TRI gge R DIR e CT CP2764 600 TRI gge R DIR e CT CP2765 900 TRI gge R P o SITI ve CP2780 2,100 TRI gge R 18 35 53 71 88 106 124 142 159 177 195 212 230 246 264 281 299 317 334 352 370 (2.0) (4.0) (6.0) (8.0) (10.0) (12) (14) (16) (18) (20) (22) (24) (26) (28) (30) (32) (34) (36) (38) (40) (42)