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ชนิดของหัวสกรู(ไขควง)
Drive Style
 
 
Hex Hex
 accepts standard 6-pt, 12-pt, or open-end wrench.
One-Way
 Basic slot has reverse side cammed so that  screwdriver can only advance the screw and not  back it out.
Phillips
 Most recommended drive type. Sharp-cornered  cross recess gives close fit and good control.  Always  use a driver bit in good condition
Slotted
 Accepts standard blade screwdriver. Requires less  downward pressure to drive slotted parts than it  does those with crossrecessed openings. Use  proper fitting blade to minimize slippage.
Spanner
 
 Special unslotted screws surface, in Round  undrilled, Flat drilled and others that require a  special wrench.
Square

 
 Square drive increases productivity with excellent  torque transmission and resistance to cam-out.
Torx
 
 Positive-engaging, fast-locating method of  transmitting torque and optimizing worker  efficiency. Reduces unauthorized removal.  Requires Torx?  driver

 

 

 

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