T25 T30 T40 T45 T50 Torx Key Security Anti Tamper Allen Star Keys Hollow Wrench

A standard Torx key has a solid star-shaped tip that fits open Torx recesses. A security Torx (also called pin-in Torx or tamper-resistant Torx) has a small center pin inside the recess that blocks standard keys. These hollow-shaft keys have a center bore that fits over the pin, allowing full engagement with the fastener.

Match the key size to the marking on the fastener or measure the across-points diameter of the recess. Common references: T20 is used in many laptop screws and small appliances; T25 and T30 appear in automotive and power tools; T40, T45, and T50 are typical for larger automotive bolts such as brake calipers and driveline components. When in doubt, start with the smallest key that fits without play.

The chrome-vanadium steel construction provides solid torsional strength for hand-tool torque ranges. For fasteners requiring a calibrated torque wrench (e.g., brake caliper bolts), use these keys with a torque-limiting adapter or a Torx bit socket in a torque wrench rather than applying excessive force directly to the L-key.

The black oxide finish provides a baseline level of corrosion resistance suitable for typical workshop storage. For extended protection in high-humidity environments, wipe the keys lightly with a thin machine oil after use. Black oxide is not a substitute for stainless steel in wet or outdoor exposure conditions.

These are L-shaped hex-shank keys designed for direct hand use. The shank diameter varies by size (T20–T50). Compatibility with T-handle holders or ratchet bit adapters depends on the adapter's bore size — contact us to confirm fitment before purchasing an adapter separately.

Multi-packs (2, 5, or 10 pcs) are cost-effective for workshops that share tools across multiple technicians, for stocking a service van, or for projects where a key may be misplaced during disassembly. Single-piece options are ideal when you need one specific size to complete a repair without committing to a full set.

Torx is a standardized profile (ISO 10664) and is not divided into metric vs. imperial variants — the T-size designation applies universally. A T25 key fits any T25 security Torx recess regardless of whether the fastener thread is metric (M-series) or imperial (UNC/UNF).