Wera 855/4 TZ SB Bits Pozidriv, PZ 3 x 50 mm

Pozidriv looks like the better-known Phillips, but is not the same. You can recognise a Pozidriv head by the extra small lines between the arms of the cross. As a result, the bit fits the screw more precisely and is less likely to slip out of the head.

Recognising Pozidriv PZ 3 and choosing the right size

Size PZ 3 belongs to the larger Pozidriv screws. Smaller screws require PZ 1 or PZ 2, so check beforehand which size matches your screws. A bit that is too small or too large sits loosely in the head and can damage the screw. You get the best result when the bit sinks fully into the head without play.

What does a length of 50 mm mean in practice?

A 50 mm bit is longer than the standard 25 mm bits. This comes in handy when you need to drive screws into a recess, through a thick board or in a hard-to-reach corner. With a longer bit, your machine or bit holder does not have to go as deep into the material. For regular work on a flat surface, a shorter bit is often sufficient too.

Pozidriv or Phillips: do not use them interchangeably

A Phillips bit does fit in a Pozidriv screw and vice versa, but not well. The fit is poorer, and the bit or the screw head wears faster. So use a Pozidriv bit with a Pozidriv screw. This transfers more force and keeps the screw head in good condition.

Frequently asked questions

Does a Phillips bit fit a Pozidriv screw?

Physically it does fit, but the fit is not optimal. The risk of slipping and damage to the screw or bit then increases. Preferably use the bit that matches the head.

How do I recognise whether a screw has a Pozidriv head?

Look at the head: with Pozidriv you can see small lines between the arms of the cross. A Phillips head does not have these lines.

Which tools is this bit suitable for?

This bit is intended for use in a bit holder or screwdriver. Check beforehand whether your machine or holder accepts the bit with a hexagonal shank.