Pozidriv vs. Security Torx
Comparing 2 standards across 10 specifications. 10 key differences identified.
The Pozidriv drive (ANSI Type IA cross recess / ISO 4757) is an improved cruciform drive developed by GKN Screws and Fasteners in 1962. Identified by four secondary radial score lines etched at 45 degrees between the main cross blades, it features parallel, non-tapered sidewalls that eliminate cam-out and allow significantly higher torque transmission than Phillips.
Security Torx (Tamper-Resistant Torx / Pin-in-Torx / Torx TR) is a tamper-evident variant of the standard hexalobular drive. Featuring a hardened solid cylindrical metal post in the center of the 6-lobed recess, it prevents standard flat, hex, or standard Torx driver bits from inserting, requiring a specialized hollow-tipped security bit.
Specification Comparison Table
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Sizing Tiers
|
PZ0, PZ1, PZ2 (dominant European carpentry size), PZ3, PZ4 | T6H, T7H, T8H, T9H, T10H, T15H, T20H, T25H, T27H, T30H, T40H ('H' or 'TR' designation) |
|
Standard Specifications
|
ISO 4757 Type IA / BS 3529 / DIN 7962 | — |
|
Visual Identification
|
4 distinctive radial tick marks embossed at 45° between the main cross arms | — |
|
Flank Geometry
|
Parallel vertical sidewalls (zero taper angle, unlike Phillips 57° taper) | — |
|
Cam-Out Tendency
|
Extremely Low (Does not push driver out under high torque) | — |
|
Primary Geographical Usage
|
Dominant across European construction, cabinetry (IKEA furniture), and automotive | — |
|
Drive Geometry
|
— | Standard 6-lobed Torx star with a centered solid cylindrical metal post |
|
Tool Bit Requirement
|
— | Hollow-center / Bore-hole driver bit (e.g. TR20 bit has a drilled center) |
|
Tamper Resistance Level
|
— | Medium (Deters unauthorized consumer disassembly without specialty tools) |
|
Primary Applications
|
— | Public infrastructure (restroom partitions, subway signs), video game consoles (Xbox, PlayStation controllers), consumer power tools |