Phillips and Pozidriv look similar and are not interchangeable. A Phillips tip tapers to cam out deliberately at a set torque; a Pozidriv tip has additional ribs that hold in the recess instead. Using one in the other rounds the recess before the screw is tight. The difference is visible on the tip once the two are held side by side.
Tip number is what identifies the size within either pattern, running PH0, PH1 and PH2 here alongside the PZ drivers. The number is read off the screw head rather than estimated, since the difference between one number and the next is small in the hand and decisive in the recess. Mixing the two is also the most common reason a screw head fails on an assembly line rather than in a workshop.
Blade length is where mechanics drivers differ most from general ones. A stubby blade at 38mm turns a screw with almost nothing above it, and a standard blade at 75mm or 100mm reaches into an assembly. Both are held in the same tips. Both blade lengths are held across the tip numbers so the reach does not fix the tip.
Mains tester drivers at 140mm and 190mm sit on the same leaf as an adjacent tool rather than a screwdriver variant. They indicate presence of voltage rather than proving its absence, which is a different operation. Send the fastener to 07754288583 on WhatsApp. Testers are held at two lengths for reach rather than for any difference in what they indicate.
By sharing your email, you agree to our privacy policy & terms of service