Slotted vs. Torx
Comparing 2 standards across 10 specifications. 10 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.
Torx (standardized as Hexalobular Internal under ISO 10664) is a 6-lobed star-shaped screw drive system developed by Camcar Textron in 1967. Engineered with a low 15-degree drive angle and curved lobes, it eliminates cam-out entirely, delivers exceptional torque transfer, and drastically extends tool bit lifespan across automotive, computing, and construction hardware.
Specification Comparison Table
10 Parameters| Parameter / Spec | ||
|---|---|---|
|
Drive Geometry
|
Single linear rectangular slot through head center | 6-pointed star with rounded circular lobes |
|
Cam-Out Tendency
|
Extremely High (Tends to climb up and out of slot under torque) | Zero (Radial drive force completely eliminates axial 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 | — |
|
International Standard
|
— | ISO 10664 (Hexalobular internal driving feature for bolts and screws) |
|
Drive Angle
|
— | 15 degrees (near-perpendicular torque vector) |
|
Common Sizing Tiers
|
— | T1–T5 (smartphones), T6–T10 (laptops/electronics), T15–T25 (wood/auto), T30–T50 (chassis/structural) |
|
External Variant
|
— | E-Torx (Inverted star socket for high-torque automotive bolts, E4 to E24) |