Slotted vs. Tri-Wing
Comparing 2 standards across 9 specifications. 9 key differences identified.
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.
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 | ||
|---|---|---|
|
Drive Geometry
|
Single linear rectangular slot through head center | 3 radial wings offset from a central triangular hub (120-degree radial spacing) |
|
Cam-Out Tendency
|
Extremely High (Tends to climb up and out of slot under torque) | Moderate (Requires steady axial alignment to prevent bit climb) |
|
Standard Specifications
|
ISO 2380 (Screwdrivers) / DIN 963 / ASME B18.6.3 | — |
|
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 | — |
|
Original Manufacturer / Spec
|
— | Phillips Screw Company / MIL-P-87893 (US Military Aerospace Specification) |
|
Standard Sizing Tiers
|
— | TRI-000, TRI-00, TRI-0, TRI-1, TRI-2, TRI-3, TRI-4, TRI-5 |
|
Primary Applications
|
— | Aerospace fuselage panels, older Nintendo cartridge/console hardware (original Game Boy, Game Boy Advance) |