pozidriv การใช้

• The manufacturing process for Pozidriv screwdriver bits is slightly more complex.
• The Pozidriv was designed specifically to allow much greater torque to be applied because of its more positive engagement.
• Slotted / Phillips ( as opposed to slotted / pozidriv ) heads occur in some North American-made switchgear.
• The Pozidriv screwdrivers have straight sided flanks, a blunt tip and additional smaller ribs at 45?to the main slots.
• In detail, the Supadriv screwhead is similar to Pozidriv but has only two identification ticks, and the secondary blades are larger.
• While Pozidriv screws have cross heads like Phillips and are sometimes thought effectively the same, the Pozidriv design allows higher torque application than Phillips.
• While Pozidriv screws have cross heads like Phillips and are sometimes thought effectively the same, the Pozidriv design allows higher torque application than Phillips.
• The Phillips driver has four simple slots cut into it, whereas in the Pozidriv each slot is the result of two machining processes at right angles.
• Phillips screwdrivers will loosely fit in and turn Pozidriv screws, but will cam out if enough torque is applied, potentially damaging the screw head and or driver.
• Their rise to popular use has been in spite of the fact that neither a flat screwdriver or Pozidriv screwdriver are fully successful in driving these screws to the required torque.
• The result of this is that the arms of the cross are " parallel-sided " with the Pozidriv, and " tapered " with the Phillips.
• The Pozidriv screws are visually distinguishable from Phillips by a set of radial indentations ( or " tick marks " ) set at 45?from the main cross recess on the head of the screw.
• Consequently, it is typical for computer parts, automobiles, and other highly engineered products, to be assembled with Torx or Pozidriv head screws, which have been specifically designed not to cam out.
• The most common screw drives are the slotted and Phillips in the US; hex, Robertson, and Torx are also common in some applications, and Pozidriv has almost completely replaced Phillips in Europe.
• Because the drive wings on a Pozidriv screwdriver are square edged, their fit in a Phillips screw head is even worse, so they are more likely to slip or tear out the screw head.
• Even though there are at least 10 types of tips-- like Tork, Robertson, Reed & Prince and Pozidriv-- the two main ones are the common tip and the Phillips.
• The chief disadvantage of Pozidriv screws is that they are visually quite similar to Phillips; thus many people are unaware of the difference and / or do not own the correct drivers for them, and often use an incorrect screwdriver.
• Combined slotted / pozidriv heads are so ubiquitous in electrical switchgear to have earned the nickname " electrician's screws " ( the first screwdriver out of the toolbox is used, and the user does not have to waste valuable time searching for the correct driver ).
• Pozidriv drive bits are often designated by the letters " PZ " plus a size code of 0, 1, 2, 3, 4 or 5 ( by order of increasing size ); the numerical bit size codes do not necessarily correspond to nominal screw size numbers.