Screw Drive Types Guide

Screw Drive Types: Complete Guide

Understanding the differences between Phillips, Torx, Hex, and other drive styles helps you choose the right fastener and avoid stripped heads.

The drive type (also called recess or head type) determines what tool you need to install or remove a screw. Choosing the right drive affects torque transfer, cam-out resistance, and ease of use.

Drive Types Explained

Phillips drive

Phillips

Also: Cross-head, Crosspoint

The most common drive type worldwide. Designed with intentional "cam-out" to prevent over-tightening with power tools, though this can also strip the head if too much torque is applied.

Advantages

  • Universal availability
  • Self-centering design
  • Works with power tools

Limitations

  • Cam-out at high torque
  • Easy to strip
  • Requires correct size
Slotted drive

Slotted (Flat)

Also: Flathead, Straight, Minus

The original screw drive — a simple slot accepts a flat-blade screwdriver. Still used for aesthetic reasons, electrical terminals, and when a "low-tech" option is preferred.

Advantages

  • Any flat tool works
  • Easy to clean out
  • Classic appearance

Limitations

  • Cam-out easily
  • Not self-centering
  • Poor torque transfer
Combo drive

Combo (Phillips/Slotted)

Also: Combination, Dual-drive

Combines Phillips cross and slotted in one recess. Accepts either driver type, useful when you're unsure what tool is available. Common on electrical and HVAC equipment.

Advantages

  • Two driver options
  • Flexible field service
  • Emergency access

Limitations

  • Neither drive optimal
  • Can strip easier
  • Lower max torque
Torx drive

Torx (6-Lobe)

Also: Star, TX, Internal 6-point

Six-pointed star pattern provides excellent torque transfer and resists cam-out. Increasingly popular in automotive, electronics, and appliances. Sizes range from T1 to T100.

Advantages

  • No cam-out
  • High torque capacity
  • Longer bit life

Limitations

  • Requires specific bits
  • Less common in stores
  • Security versions exist
External Hex

External Hex

Also: Hex head, Hex bolt

Six-sided external head driven by a wrench or socket. The standard for structural bolts, lag screws, and heavy-duty applications where maximum torque is needed.

Advantages

  • Maximum torque
  • Strong head design
  • Easy visual inspection

Limitations

  • Requires wrench clearance
  • Head protrudes
  • Can round off
Square drive

Square (Robertson)

Also: Scrulox, R-drive

Canadian invention with tapered square socket. Excellent cam-out resistance and one-handed use (bit stays in screw). Standard in Canada, popular for decking and woodworking.

Advantages

  • Zero cam-out
  • Bit stays in screw
  • One-handed driving

Limitations

  • Less common in US/EU
  • Only 5 sizes (#0-#4)
  • Specific bits needed
Pozidriv

Pozidriv

Also: Pozi, PZ, SupaDriv

Improved Phillips with additional smaller ribs at 45°. Reduces cam-out significantly. Common in European manufacturing and furniture. NOT interchangeable with Phillips.

Advantages

  • Less cam-out than Phillips
  • Higher torque possible
  • Better power tool use

Limitations

  • Looks like Phillips
  • Wrong bit damages both
  • Less common in USA

Drive Type Comparison Chart

Drive Type Torque Cam-Out Availability Best For
Phillips Medium High Excellent General purpose, wood screws
Slotted Low Very High Excellent Electrical, decorative
Combo Low-Med High Good Field service, HVAC
Torx High None Good Automotive, electronics
External Hex Very High None Excellent Structural, heavy duty
Square (Robertson) High None Good Decking, woodworking
Pozidriv High Low Good (EU) European mfg, furniture

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