How it connects
A male T25 six-lobe bit slides axially into the recess and transmits torque through the lobe flanks. There is no seal and no retention, apart from a slight friction fit.
Male and female halves
This is the female half: the internal recess in the fastener head. The male half is the T25 driver bit. Tamper-resistant 'TR' or security T25 recesses have a center pin and need a hollow bit.
Usually connects to
- Matching T-size TORX/hexalobular screwdriver, power bit, bit socket or L-key, including T15 and T25 examples
Common sizes
- TORX spans T1–T100; common sizes include T5, T6, T8, T10, T15, T20, T25, T27, T30, T40, T45, T50, T55 and T60.
- T25 tips are about 4.4 mm across points, common on #9/#10 wood/deck screws, M5 machine screws and #10 sheet-metal screws.
- T15 recesses are about 2.6 mm (0.10 in) point-to-point, common on #6–#8 or M3.5–M4 deck/cabinet screws.
Where it is used
Wood/deck screws, including hidden fastenersConstructionAutomotiveElectronics/consumer appliancesMachinery and machine/cap screws
Variations
- Standard ISO 10664 TORX
- Security center-pin TORX, including TR15/T15H and TR25
- TORX Plus IP15/IP25, with flatter/different lobes and limited interchangeability; one description calls IP25 five-lobe
- External E-TORX bolt head
- TORX ttap stability button
How to recognise it
A six-pointed star-shaped recess with rounded lobes in the screw head, roughly 4.4–4.5 mm across the points. It is often marked T25 on packaging.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Torx Plus IP25 | Its lobes are squarer and flatter. A T25 bit fits but is loose. |
| Hex / Allen Socket (Internal Hex) | A hex socket has six flat sides and sharp corners; Torx has six rounded lobes. Hex socket features 6 flat straight sides with sharp internal corners, whereas Torx features 6 rounded, lobed/star petals. |
| T27 / T20 Torx | These are neighbouring sizes. Check the label or test with a bit; T25 is about 4.4 mm across the points. |
| Torx Plus Recess | Torx Plus lobes have flatter, more squared-off lobe profiles rather than pointed star radii; standard Torx bits fit loosely in Torx Plus recesses, while Torx Plus bits do not fit standard Torx recesses. |
| Security Torx (TR) | Security Torx has a solid cylindrical post protruding from the center of the socket that prevents insertion of standard solid Torx bits. |
Also called
Torx T25star drive T25hexalobular internal drive size 256-lobe T25; 6-lobe recess; 6-lobe T15TX25Torx recessT15 star drive; star recess T15Internal hexalobular socket; hexalobular socket T15
Good to know
This is a tool-drive recess. A measured envelope about 4.5 mm across and 2.2 mm deep is consistent with T25; match the actual T-size.
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