Best T40 Star Bits for Impact Drivers and Security Screws
The best T40 star bit depends on whether you need a standard Torx bit, a tamper-resistant bit with a center hole, or a broader set of sizes. Bosch is a strong choice for repeated impact-driver use, while the GEINXURN sets offer magnetic 2-inch bits. HORUSDY and ROTATION include security sizes through T40, and VEGA provides a focused pack of T40 security bits.
| Product | Best For | Key Feature |
|---|---|---|
| Bosch ITT402B | Impact-driver work | Torsion zone and precision tips |
| GEINXURN 5-Piece Set | Magnetic T40 driving | Five 2-inch impact bits |
| GEINXURN 10-Piece Set | Spare bits and storage | Ten bits with storage box |
| HORUSDY Security Set | Multiple security Torx sizes | T5–T40 range |
| VEGA T40 Security Bits | Focused T40 security work | Precision-machined tips |
Bosch ITT402B T40 Impact Bits
Best for: Buyers who primarily need T40 bits for impact-driver applications. This 10-pack has an extended torsion zone designed to absorb high torque, and Bosch lists it as offering up to 10 times the life of standard impact bits. Precision-engineered tips are intended to fit fasteners more tightly and reduce cam-out.
Choose this set if impact use and tip fit are priorities and you want multiple replacement bits on hand. The listed features do not specify magnetic tips or a storage case, so avoid this option if either is essential to your setup.
GEINXURN Five-Piece Magnetic T40 Set
Best for: Users who want magnetic 2-inch T40 bits for power driving. The set contains five bits made from S2 alloy steel, with an impact shock-absorbent zone intended for high-torque impact drivers. The magnetic feature is designed to pick up and hold screws.
This is a straightforward choice when you need several T40 bits rather than a mixed-size kit. The product listing describes standard T40 power bits, not tamper-resistant bits with a center hole, so choose another option if your fastener has a security pin.
GEINXURN Ten-Piece T40 Set With Case
Best for: Buyers who want a larger supply of 2-inch T40 bits with included storage. The 10-piece set uses S2 alloy steel and includes an impact shock-absorbent zone. Its storage box is described as portable and useful for keeping the bits together.
Choose this set over the five-piece option if having more matching bits and a storage box matters. The listed features do not state that these bits are magnetic, and they do not identify them as tamper-resistant; check your fastener type before buying.
HORUSDY T5–T40 Security Torx Set
Best for: Repair work involving tamper-resistant Torx screws in different sizes. The set includes 13 tamper-resistant bits from T6 through T40, plus a standard T5 bit and a connector. The bits are made from hardened and tempered S2 steel and come with an orange storage sleeve.
This set is more versatile than a T40-only pack when you need several security sizes. The listing identifies T5 as a standard bit, while the other listed sizes are tamper-resistant; confirm the included size and bit type for each fastener before starting work.
VEGA T40 Security Bits, Four-Pack
Best for: Buyers who need T40 tamper-proof bits specifically, rather than a kit spanning multiple sizes. This four-pack has 1-inch bits with 1/4-inch hex shanks. VEGA lists precision CNC-machined tips and S2 modified shock-resistant steel as key features.
Choose this option when a short, focused security-bit pack suits your work. It is limited to T40 bits, so it is less useful than a mixed-size kit if you also need other Torx sizes. The listing specifies security bits, not a magnetic feature.
Buying Guide: How To Choose A T40 Star Bit
Do you need standard or tamper-resistant T40?
A standard T40 bit is for a regular six-point Torx recess. A tamper-resistant Torx bit has a hole in its tip to accommodate a center pin in the screw. Match the bit to the fastener: a standard bit will not fit over a security pin. Product names and listings use terms such as “star,” “Torx,” and “security Torx,” so check the stated bit type rather than relying on the word “star” alone.
Will you use an impact driver?
For impact-driver work, look for features explicitly described for impact use, such as a torsion or shock-absorbing zone. Bosch and both GEINXURN options list impact-oriented features. These features do not guarantee a particular service life in every application; use the correct T40 size and keep the bit fully seated to help reduce slipping and wear.
Should you choose a single-size pack or a mixed set?
A T40-only pack makes sense when T40 is the size you use most and you want matching spares. A T5–T40 security set is more practical when you work on different fasteners. Consider bit length, too: the GEINXURN bits are 2 inches long, while the VEGA bits are 1 inch long. Choose based on access and the bit length your tool setup accepts.
Are magnetic bits important?
Magnetic bits can help hold a screw during positioning and driving. GEINXURN explicitly lists magnetic tips for its five-piece set. Do not assume a bit is magnetic unless its product details say so.
Frequently Asked Questions
What does T40 mean on a star bit?
T40 is the Torx size. The bit must match the T40 recess on the screw to engage properly.
Is a T40 security bit the same as a standard T40 bit?
No. A security T40 bit has a center hole for a pin in a tamper-resistant screw. A standard T40 bit has no hole.
Can I use a T40 bit with an impact driver?
Use a bit listed for impact applications and confirm that its shank fits your tool. Bosch and GEINXURN describe impact-oriented features in their listings.
What T40 bit length should I choose?
Choose a length suited to the access you need and your tool setup. The products here include 1-inch and 2-inch options.
Does a larger T40 set include other sizes?
Not necessarily. The GEINXURN packs contain T40 bits only, while the HORUSDY set includes multiple sizes from T5 through T40.