External Torx Size Chart

Quick answer: external Torx sockets are identified by E sizes. An E8 socket has an approximate profile dimension of 7.5 mm (0.292 in) and appears in standard selection references for 1/4-inch and M6-M7 fasteners. Use the E size to identify the external drive; check the actual fastener head before choosing a socket.

External Torx Socket Sizes

The E designation describes an external Torx profile that the socket fits. It is not the same scale as an internal T-bit size. Dimensions below are approximate references. The screw-size pairings come from a standard drive-selection guide and may not cover every head style or product specification.

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Choosing the Right E Socket

Match the E socket to the external star profile, not to an internal Torx recess.

Seat the socket fully and check for rocking before applying torque.
Clean corrosion or coating from the head so it does not interfere with engagement.
Use impact-rated sockets with impact tools.

A screw-size reference can help narrow the search, but thread diameter alone does not confirm the drive size. Follow the fastener or vehicle service information when available.

Related references: Allen wrench sizes, socket sizes in order, and bolt spanner sizes.