Phillips vs. Pozidriv
Comparing 2 standards across 11 specifications. 11 key differences identified.
The Phillips drive (Type I cross recess) is a self-centering cruciform drive system invented by John P. Thompson and commercialized by Henry F. Phillips in the 1930s (ANSI Type I / ISO 4757). Engineered with curved flutes and intentional cam-out torque limiting, it revolutionized high-speed automotive and aircraft assembly.
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.
Specification Comparison Table
11 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Specifications
|
ISO 4757 (Cross recesses) / ANSI Type I / DIN 7962 | ISO 4757 Type IA / BS 3529 / DIN 7962 |
|
Drive Geometry
|
Cruciform 4-wing cross with rounded corners and 57° tapered flanks | — |
|
Self-Centering Capability
|
Yes (Driver tip automatically centers into recess) | — |
|
Intentional Cam-Out
|
Yes (Designed to cam-out when tightened to prevent over-torquing and thread stripping) | — |
|
Common Sizing Tiers
|
PH000, PH00, PH0, PH1, PH2 (most common), PH3, PH4 | — |
|
Common Screw Pairings
|
Drywall screws, PC cases (#6-32), general wood and machine screws | — |
|
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) |
|
Standard Sizing Tiers
|
— | PZ0, PZ1, PZ2 (dominant European carpentry size), PZ3, PZ4 |
|
Primary Geographical Usage
|
— | Dominant across European construction, cabinetry (IKEA furniture), and automotive |