PH vs PZ vs Torx vs Allen: How to choose bits and avoid stripping screws

PH vs PZ vs Torx vs Allen: How to choose bits and avoid stripping screws

1) What happens when we strip a screw?

Most of the time, it's not "lack of strength"—it's:

  • wrong bit (PH in a PZ, for example),

  • wrong bit size (PH1 vs PH2),

  • misaligned tool (angle),

  • or excessive torque.

The result is the classic "cam-out": the bit comes out of its socket and grinds the screw head.

2) Phillips (PH) vs Pozidriv (PZ): They look the same, but they're not.

Accu explains that although a Phillips head may seem to fit into a Pozidriv screw, this greatly increases the risk of slipping and damaging the screw/bit.
In practical terms (Portugal):

  • PH appears frequently in general use and some simpler kits.

  • PZ is very common in screws for wood, hardware, and furniture assembly.

How to recognize PZ screws: many PZ screws have additional markings (a subtle "extra cross") around the main cross. And the fitting tends to "catch" better with the correct PZ bit.

Best-selling sizes:

  • PH2 and PZ2 are the "kings" of home DIY.

  • PH1/PZ1 appear on smaller hardware.

3) Torx (T): Why is it so popular in electronics and automotive?

Torx is a 6-lobe star-shaped socket. The technical description itself states that Torx is designed to better resist cam-out than Phillips/slot sockets.
That's why it appears frequently in:

  • car and motorcycle,

  • bicycles (brakes/discs),

  • computers and electronics.

Common sizes: T10, T15, T20, T25, T30 (depends on the sector).
If you sell "home + car" kits, having Torx connectors in the set is a real differentiator.

4) Allen/Hex (internal hexagon): the "classic" of furniture

Frequently used in:

  • furniture (like IKEA),

  • bicycles,

  • Metal supports and structures.

Here, the risk of dusting comes from:

  • using a worn-out wrench,

  • Use a nearby unit of measurement (imperial vs. metric).

  • or applying torque with a short wrench when a wrench with better support should be used.

5) How to choose bits (purchase checklist)

A) Choose the correct type (PH/PZ/Torx/Hex)

  • Standard cross screw → PH or PZ (confirm visually).

  • Star screw → Torx.

  • Internal hexagon → Allen/Hex.

B) Choose the right size (which nobody does)

If the bit has play in the socket, it's faulty. The correct way is:

  • enters "full"

  • don't shake

  • It does not require lateral force to "hold"

C) Looking for bits made of S2 steel (quality)

It is common to find bit sets that explicitly state S2 steel for tips, such as those found in products from brands sold in Brazil.
(In simple terms: S2 bits tend to withstand repeated use better than very "soft" bits.)

6) Tightening technique that reduces stripped screws by 80%

  1. Axial pressure : pushes the bit against the screw, not "from the side".

  2. Alignment : 90° with the screw head.

  3. Start slowly : 1-2 slow turns before accelerating (especially with a power drill).

  4. Controlled torque : Uses clutch/torque limit on the screwdriver whenever possible.

  5. He replaces the bit when it starts to become rounded (it's cheap, avoids expensive damage).

7) Safety: Electrical work is NOT a "DIY with any wrench" solution.

If your client is looking for "electrician's tool kit" or "1000V insulated wrenches," the conversation changes: the IEC 60900 standard defines requirements for insulated tools used in/near energized parts up to 1000V AC and 1500V DC, with testing (including high-voltage testing).
For UMBOX, this is a subcategory with a lot of value (and purchase confidence).

FAQ

Can I use PH on a PZ screw?
It's the number one cause of damaged heads in DIY projects: it increases the risk of slipping and "eating" the fitting.

Is Torx "better" than Phillips?
For applications requiring higher torque and less cam-out tendency, Torx is often preferred and was designed to reduce this problem.