Phillips vs. Slotted
Comparing 2 standards across 9 specifications. 9 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 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
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard Specifications
|
ISO 4757 (Cross recesses) / ANSI Type I / DIN 7962 | ISO 2380 (Screwdrivers) / DIN 963 / ASME B18.6.3 |
|
Drive Geometry
|
Cruciform 4-wing cross with rounded corners and 57° tapered flanks | Single linear rectangular slot through head center |
|
Self-Centering Capability
|
Yes (Driver tip automatically centers into recess) | None (Driver freely slides laterally out of slot) |
|
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 | — |
|
Cam-Out Tendency
|
— | Extremely High (Tends to climb up and out of slot under torque) |
|
Power Tool Suitability
|
— | Unsuitable (High risk of workpiece scratching / bit slippage) |
|
Primary Modern Applications
|
— | Antique furniture restoration, electrical switch wallplates, plumbing fixtures |