7.3 -Tools Flashcards
What are screw drivers made up of ?
Tip/blade
Shank
Handle
What are some characteristics of a screw driver handle ?
Non conductive of heat or electricity
What are screwdriver shanks made of ?
Carbon steel
What % of the screwdriver tip must slot into the fastener, to stop slippage ? (Flat head)
At least 75%
What is the angle of a Phillips screwdriver head ?
How are they numbered ?
30 degrees
Numbered 0 to 5, 5 being the biggest size
Angle of a Reed and Prince or Frearson screwdriver head ?
45 degrees
Difference between Phillips and Reed + Prince (Frearson) screwdrivers ?
Reed + Prince (Frearson) is sharper and has a bigger angle (45 degrees) compared to the 30 degrees of a Phillips head
Reed + Prince - higher torque can be achieved
What is rounding a fastener also known as ?
Cam-out
Benefits of Posidriv screwdrivers ?
Improved version of the Phillips, due to increased contact area.
Reduces cam-out
Benefits of Torx screwdrivers ?
Ability to apply more torque, reduces cam-out
Less operator effort
What are Internal Hex types also known as ?
Allen key fittings
Benefits of a tri-wing fitting ?
Greater torque transfer to the screw
Benefits of Torq-set screws ?
Cross is offset compares to a normal Phillips cross.
Greater torque transfer
Benefits of a MorTorq fastener ?
4 wings that are curved in a cross pattern
This design allows for a shallower recess, yet retain its strength, allowing for less weight
Benefits of a Hi-torque fastener ?
Straight slot arrangement (Like a Flat Head) expect it gets wider on the ends of the slot.
Higher toque can be applied
Suitable where there is a need to repeatedly install and remove the fastener, used on thin skin a/c
