// DRIVE TYPE REFERENCE
Drives built to resist tampering.
Every security fastener uses a specialized recess that common tools can't turn. Here's a reference to the drive systems we stock and manufacture — each available in a range of head styles, materials, and finishes.
Security Screw Drives
PIN-IN TORX® STYLE
Pin-in 6-Lobe
PIN-IN HEX / ALLEN
Pin-in Hex
SPANNER / TWO-HOLE
Spanner
ONE-WAY / INSTALL-ONLY
One-Way
TRI-GROOVE
Tri-Groove
Security level
High
Medium
Medium–High
Medium
Very High
Removable
Yes, with matching bit
Yes, with security bit
Yes, with spanner driver
Difficult — removal tool only
Special tool only
Best application
OEM equipment & enclosures
Machinery & OEM assemblies
Public fixtures & restrooms
Permanent installations
Anti-theft & institutional
Sizes
T7 – T40
3/32" – 5/16"
#4 – #14
#6 – 1/4"
6-32 – 1/4"-20
Drive tool
TT bit / HDTT driver
THB security bit
SPD spanner driver
SSTM removal tool
Tri-Groove socket + handle
Most drives ship in button and flat head styles, in 18-8, 316, and 410 stainless, alloy, and zinc- or black-oxide-plated steel. Head diameters, heights, and hex sizes are detailed in our printed catalog. Torx® is a registered trademark of Acument Global Technologies.