Pozidriv vs. Slotted
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.
The Slotted drive (Flat Head / Flat Blade) is the original single-slot fastener drive geometry standardized under ISO 2380 and DIN 963. Operated with a flat screwdriver blade, it features no inherent centering or cam-out retention, making it susceptible to tool slippage and strictly limited to manual assembly and decorative restoration.
Specification Comparison Table
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Specifications
|
ISO 4757 Type IA / BS 3529 / DIN 7962 | ISO 2380 (Screwdrivers) / DIN 963 / ASME B18.6.3 |
|
Cam-Out Tendency
|
Extremely Low (Does not push driver out under high torque) | Extremely High (Tends to climb up and out of slot under torque) |
|
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) | — |
|
Standard Sizing Tiers
|
PZ0, PZ1, PZ2 (dominant European carpentry size), PZ3, PZ4 | — |
|
Primary Geographical Usage
|
Dominant across European construction, cabinetry (IKEA furniture), and automotive | — |
|
Drive Geometry
|
— | Single linear rectangular slot through head center |
|
Self-Centering Capability
|
— | None (Driver freely slides laterally out of slot) |
|
Power Tool Suitability
|
— | Unsuitable (High risk of workpiece scratching / bit slippage) |
|
Primary Modern Applications
|
— | Antique furniture restoration, electrical switch wallplates, plumbing fixtures |