How it connects
The mating driver bit inserts into the internal six-lobe recess. In dedicated ttap bits, an extended center pin/button seats tightly into the central recess pocket, providing stability and friction fit.
Male and female halves
Female drive recess formed in the screw head; mates with an external/male TORX ttap or standard TORX driver bit.
Usually connects to
- Matching T-size TORX ttap bit with center nib for the best stick-fit
- Same-size standard TORX/hexalobular bit, backward-compatible but without stick-fit
Common sizes
- ttap follows TORX T-numbers, commonly T10–T40; wood/structural screws often use T20/T25/T30/T40, roughly 3.9–6.7 mm across lobes.
- Examples differ in whether the size is specified; one uses T40. Confirm the actual fastener T-size.
Where it is used
construction fastenerswood and structural screws; deck and wood screwsdecking and framing screwsroofing and claddingassembly fasteningconstruction and decking screws; decking and timber screwsautomotive and industrial fastenersindustrial fastening
Variations
- TORX ttap flat head recess
- TORX ttap washer head / hex head recess
- TORX ttap in different T-sizes
- T-sizes T10–T50 range
- ttap on countersunk, pan and washer-head screws
- TORX ttap with Frixion Fit
How to recognise it
Recognised by a standard 6-lobe star socket with a noticeable sunken circular pocket or well centered at the bottom of the socket.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| standard TORX (ISO 10664) recess | Standard TORX recesses have a flat bottom across the lobes, whereas TORX ttap has a distinct deeper cylindrical/conical well in the center. |
| Torx Plus (IP) recess | Torx Plus uses squared lobe lobes rather than round lobes and does not feature the central pilot alignment well. |
| Security Torx (pin-in Torx) female recess | Security Torx has a solid pin protruding upward in the center of the socket, whereas TORX ttap has a hole/recess sunken into the bottom. |
| Standard TORX (hexalobular) recess | A plain TORX recess has a flat or cone-shaped bottom with no extra pocket in the middle. A ttap recess has a smaller round pocket at the bottom of the lobes. |
| TORX Plus / tamper-resistant TORX (pin in center) | On a tamper-resistant TORX recess a pin sticks up out of the middle. On ttap there is a hole in the middle, not a pin. TORX Plus has squarer lobes. |
Also called
TORX ttap recessTORX ttap female drivesix-lobe ttap recesshexalobular recess with ttapsix-lobe with stabilizing recessT-ttapStar TTap (retail bit naming)ttap screw drive
Good to know
Fully backward compatible: a standard Torx bit can drive a TORX ttap fastener, but only a TORX ttap driver bit engages the center stability button to prevent wobble and give stick-fit retention.
Related connections
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