Pozidriv vs. Tri-Wing
Comparing 2 standards across 9 specifications. 9 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 Tri-Wing drive (standardized under military spec MIL-P-87893 / NASM 87893) is a tamper-resistant security drive featuring three radial slotted wings surrounding a triangular center point. Originally developed for aerospace structural skins, it was adopted by Nintendo for older cartridge and console hardware -- a distinct drive from the visually different Tri-Point/Y-type screw Apple uses today, despite the two often being confused.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Cam-Out Tendency
|
Extremely Low (Does not push driver out under high torque) | Moderate (Requires steady axial alignment to prevent bit climb) |
|
Standard Sizing Tiers
|
PZ0, PZ1, PZ2 (dominant European carpentry size), PZ3, PZ4 | TRI-000, TRI-00, TRI-0, TRI-1, TRI-2, TRI-3, TRI-4, TRI-5 |
|
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) | — |
|
Primary Geographical Usage
|
Dominant across European construction, cabinetry (IKEA furniture), and automotive | — |
|
Original Manufacturer / Spec
|
— | Phillips Screw Company / MIL-P-87893 (US Military Aerospace Specification) |
|
Drive Geometry
|
— | 3 radial wings offset from a central triangular hub (120-degree radial spacing) |
|
Primary Applications
|
— | Aerospace fuselage panels, older Nintendo cartridge/console hardware (original Game Boy, Game Boy Advance) |