T50 refers to the size of the Torx (6-point star) tip that fits screws marked T50. It’s the tip size, not the handle or socket drive size.

• Forms you’ll see: T50 screwdriver bits with a 1/4-inch hex shank, and T50 bit sockets with 1/4-inch, 3/8-inch, or 1/2-inch square drives.
• Drive size vs. tip size: Choose the square drive to match your ratchet or wrench; the tip remains T50.
• Standard vs. security: Some T50 fasteners have a center pin (security). Those need a T50 security/TR bit with a hole.

For best fit, match the bit to the fastener head and your tool’s drive. Checking the fastener marking or manual can help confirm the correct size.

For safety and to avoid stripping, it’s advisable to use the correct T50 Torx bit. Substituting with flathead, Phillips, or hex/Allen tools can damage the fastener.

• If the head is internal (6-point star): Use a T50 bit or a “star” bit labeled T50—they’re typically the same geometry.
• If the fastener is external (star-shaped bolt head): That’s E-Torx, which uses a different size system. Match it with the correct E-socket instead of T50.
• If there’s a center pin: You’ll need a T50 security/TR bit.

If you don’t have the right bit, ordering online for pickup or delivery can be a practical way to get the proper tool without risking damage.

T50 is a specific size within the Torx system. There isn’t a direct metric or SAE hex equivalent because Torx uses a unique 6-point star profile.

• Equivalent naming: Tools may be labeled “Torx T50” or “Star T50”; these typically refer to the same internal Torx size.
• Not the same as E-Torx: E-Torx sockets fit external star-shaped bolts and follow E-sizes (E4, E8, etc.), which don’t correspond to T-sizes.
• Security variants: A T50 TR or “security T50” has a hole to clear a center pin but remains a T50 size.

When in doubt, match the tool to the fastener’s head style and marking rather than searching for a non-Torx size equivalent.

In many listings, “star bit” is simply another name for a Torx bit, especially for the common 6-point star profile.

• Standard Torx: 6-point internal star (e.g., T50). Works with screws marked T-sizes.
• Security Torx (TR): 6-point with a center pin in the screw; requires a matching bit with a hole.
• 5-point security star: A different profile (often called security star). It won’t interchange with Torx.
• E-Torx: External star bolts that use E-sockets, not internal Torx bits.

Check your fastener’s shape: count the points, look for a center pin, and confirm whether it’s internal or external. That helps you choose the right bit quickly.

Your T50 tip stays the same—the square drive size (1/4-inch, 3/8-inch, or 1/2-inch) should match your ratchet and the torque you need.

• 1/4-inch drive: Compact for tight spaces and lighter torque.
• 3/8-inch drive: Versatile for general automotive and home tasks.
• 1/2-inch drive: Better for higher torque and larger fasteners.
• Impact or hand use: For power tools, look for impact-rated sockets/bits (often Cr-Mo). For hand tools, chrome vanadium sockets with S2 bits are common. Some pieces are marked “for hand use only.”
• Length: Standard vs. long bits can help reach recessed fasteners.

Selecting the right drive and style can improve control and reduce the chance of rounding or slippage.