How it connects
Driver tip is inserted axially into the recess; the six lobes transmit torque; the centre pin enters the bit's bore, so a standard solid Torx bit cannot seat. Temporary tool engagement, no sealing.
Male and female halves
Recess (female, with male pin) on the screw head; the TR bit is male lobes with a female centre hole. This port is the screw-head recess.
Usually connects to
- Matching-T-size tamper-resistant TORX TR/T-H driver with a hollow tip for the center pin
Common sizes
- Security sizes share Torx T-numbers: listed ranges include TR6/T6H–TR55 and TR8/T8–TR40; common screws use TR10–TR30, especially T10/T15/T20/T25.
- About 3.3 mm across lobes with a 1 mm center pin is consistent with T15; confirm the actual size.
Where it is used
public fixtures and signagerestroom partitionselectronics and appliance enclosuresautomotivevandal-resistant hardwarevandal-resistant fastening
Variations
- Torx Plus Tamper Resistant (5-lobe pin, Acument); Torx Plus Tamper-Resistant 5-lobe with pin (TS)
- Torx TR in button, flat, pan head screws and sheet-metal screws
- Plain Torx without pin
How to recognise it
Six-pointed star-shaped recess with rounded lobes and a small round pin standing up in the centre of the recess; found on button, pan or flat head security screws.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Standard Torx (hexalobular) recess | Standard Torx has no centre pin; TR has a visible post in the middle. |
| Torx Plus Tamper Resistant | Torx Plus TR has five lobes with squarer lobe flanks; Torx TR has six rounded lobes. |
| Pin-in hex (security hex/Allen) | Hex has six flat sides and sharp corners rather than rounded lobes. Hex has six flat sides; Torx has rounded star lobes. |
| Torx Plus Tamper-Resistant 5-lobe (TS) | Count lobes: TS has five, TR has six. |
Also called
Torx TRtamper-resistant Torxsecurity Torxpin-in Torxsix-lobe pin; 6-lobe pin securitypin hex-lobularStar pin security driveHexalobular with pin
Good to know
This is a screw-head-to-driver interface. Torx is a trademark; the generic shape is hexalobular or six-lobe. Confirm the exact T-size rather than relying on an estimated T15.
Related connections
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