Torx Screwdriver Sizes Chart: Complete Guide for Professionals
Choosing the right torx screwdriver starts with matching the tool to the fastener. Torx screws are easy to identify by their six-point star-shaped recess, but the size range is wide. A T10 driver will not fit a T25 screw, and forcing the wrong size leads to rounded recesses, damaged workpieces, and lost time.
This guide gives you a complete torx screwdriver sizes chart, explains how to read Torx designations, and shows which sizes are used in electronics, automotive work, and industrial applications. Whether you are a contractor selecting tools for a crew, a distributor building a product line, or a brand owner sourcing OEM screwdriver sets, this article will help you make informed decisions.
Torx is also known as a star drive. Star screwdriver sizes use the same T-number system, so a T25 Torx driver and a T25 star driver are identical.
For a full range of professional options, browse our Torx screwdriver selection.
What Is a Torx Screwdriver?
A Torx screwdriver is a tool designed to drive screws with a six-lobe, star-shaped recess. The design is also called a hexalobular drive, and it was developed to solve the cam-out problems common with Phillips and slotted screws. The six lobes distribute force evenly, so the driver stays seated under high torque.
Torx sizes are marked with a “T” followed by a number. For example, T10, T25, and T40 describe the size of the driver tip. The number does not correspond directly to millimeters or inches. Instead, it refers to the point-to-point width of the tip, which is standardized under ISO 10664.
Using the correct size is important. A driver that is too small will strip the recess. A driver that is too large will not enter the screw at all. For high-volume assembly, repair shops, and field service teams, keeping a complete Torx set on hand reduces downtime and protects finished products.
Types of Torx Screwdrivers
Different jobs call for different driver styles. The most common types include:
- Standard fixed-blade drivers for everyday assembly and repair work.
- Replaceable Torx bits that fit standard bit holders and impact drivers.
- Tamper-resistant Torx drivers with a hollow tip for screws that include a center pin.
- T-handle Torx drivers that allow higher torque for automotive and machinery work.
- Precision Torx drivers with small handles for electronics and delicate devices.
- Socket-style Torx drivers for use with ratchets in heavy equipment maintenance.
Each type serves a purpose, but the most important specification remains the size. A complete set with T1 through T40 covers most commercial and industrial needs. For impact-rated work, the same torx bit sizes fit standard 1/4-inch hex shank holders.
Complete Torx Screwdriver Sizes Chart
The chart below lists the most common torx screwdriver sizes, their point-to-point tip width in inches and millimeters, and typical applications. This is the reference table technicians, buyers, and quality teams use when matching drivers to fasteners.
| Torx Size | Point-to-Point (in) | Point-to-Point (mm) | Typical Screw Size | Common Applications |
|---|---|---|---|---|
| T1 | 0.031 | 0.81 | M1.0 – M1.2 | Very small electronics, watches, micro devices |
| T2 | 0.036 | 0.93 | M1.2 – M1.4 | Small electronics, precision instruments |
| T3 | 0.046 | 1.10 | M1.4 – M1.6 | Mobile phones, compact electronics |
| T4 | 0.050 | 1.28 | M1.6 – M1.8 | Laptops, small appliances |
| T5 | 0.055 | 1.42 | M1.8 – M2.0 | Laptops, hard drives, consumer electronics |
| T6 | 0.066 | 1.70 | M2.0 – M2.5 | Electronics, cameras, game consoles |
| T7 | 0.078 | 1.99 | M2.5 – M3.0 | Power tools, small machinery |
| T8 | 0.090 | 2.31 | M3.0 – M3.5 | Electronics, automotive trim |
| T9 | 0.098 | 2.50 | M3.5 | Automotive sensors, electronics |
| T10 | 0.107 | 2.74 | M4.0 – M5.0 | Electronics, appliances, automotive |
| T15 | 0.128 | 3.27 | M5.0 – M6.0 | Automotive, bicycles, household appliances |
| T20 | 0.151 | 3.86 | M6.0 – M8.0 | Automotive, machinery, outdoor equipment |
| T25 | 0.173 | 4.43 | M8.0 – M10.0 | Brake calipers, automotive, construction |
| T27 | 0.195 | 4.99 | M10.0 | Automotive, heavy equipment |
| T30 | 0.216 | 5.52 | M10.0 – M12.0 | Machinery, automotive, structural fasteners |
| T40 | 0.260 | 6.65 | M12.0 – M14.0 | Heavy machinery, automotive frames |
| T45 | 0.306 | 7.82 | M14.0 | Trucks, trailers, heavy equipment |
| T47 | 0.328 | 8.41 | M14.0 | GM-style brake calipers, automotive |
| T50 | 0.346 | 8.83 | M16.0 – M20.0 | Heavy trucks, industrial machinery |
| T55 | 0.440 | 11.22 | M20.0 | Agricultural machinery, heavy trucks |
| T60 | 0.520 | 13.25 | M24.0 | Industrial machinery, heavy equipment |
| T70 | 0.610 | 15.51 | M27.0 – M30.0 | Large industrial fasteners |
| T80 | 0.690 | 17.54 | M33.0 – M36.0 | Heavy construction, rail equipment |
| T90 | 0.784 | 19.92 | M39.0 – M42.0 | Large industrial and marine fasteners |
| T100 | 0.871 | 22.13 | M42.0+ | Heavy machinery, wind energy, infrastructure |
This torx screwdriver sizes chart covers the range most professionals encounter. For general repair and assembly work, a set from T10 to T40 is usually sufficient. Electronics repair teams need precision sizes from T1 to T10. Heavy equipment and industrial maintenance teams often require sizes from T40 up to T100.
Torx Bit Sizes for Power Drivers
Many professionals use Torx bits instead of fixed-blade drivers. Torx bit sizes follow the same T-number system as full-handled screwdrivers. A T25 bit has the same tip dimensions as a T25 fixed-blade driver.
Common bit formats include:
- 1-inch insert bits for manual bit holders and screwdrivers.
- 2-inch power bits for drill/drivers and impact drivers.
- Torx sockets for 1/4-inch, 3/8-inch, or 1/2-inch ratchets.
Most insert bits use a 1/4-inch hex shank, so they fit standard bit holders, impact drivers, and magnetic bit extensions. When ordering for industrial or automotive crews, make sure the bit length and shank match the tools already in use.
How to Read Torx Sizes
Understanding how to read torx screwdriver sizes is the first step to choosing the right tool. Torx sizes follow a simple naming system, but the numbers do not describe thread diameter. Instead, each T-size corresponds to the point-to-point measurement of the driver tip. The higher the number, the larger the tip.
For example:
- A T10 torx screwdriver has a tip width of about 2.74 mm point-to-point.
- A T25 torx screwdriver has a tip width of about 4.43 mm point-to-point.
- A T40 torx screwdriver has a tip width of about 6.65 mm point-to-point.
The point-to-point measurement is taken across opposite points of the star-shaped tip. This is different from the across-flats measurement used for hex keys and sockets. Always check the screw head marking or measure the recess with a Torx gauge when the size is unclear.
Torx vs. Torx Plus vs. Tamper-Resistant Torx
Three similar drive systems are often grouped together, but they are not interchangeable. Choosing the wrong driver will damage the fastener and waste time.
| Feature | Standard Torx | Torx Plus | Tamper-Resistant Torx |
|---|---|---|---|
| Shape | Six-point star | Six-point star with oval lobes | Six-point star with center pin |
| Marking | T (T10, T25, T40) | IP (IP10, IP25, IP40) | TR or pin-in Torx |
| Compatibility | Fits only standard Torx | Fits only Torx Plus | Requires hollow-tip security driver |
| Torque capacity | High | Higher contact area, more torque | Same as standard Torx |
| Common uses | Electronics, automotive, machinery | Industrial assembly, aerospace | Public fixtures, electronics, security panels |
Standard Torx is the most widely used system. It provides excellent torque transfer and is available in a full range of sizes.
Torx Plus uses a modified lobe shape that increases contact area. It allows higher torque with less wear and is common in automotive assembly, aerospace, and high-volume manufacturing. Torx Plus drivers will not fit standard Torx screws.
Tamper-resistant Torx, also called security Torx or pin-in Torx, has a small post in the center of the recess. Standard Torx drivers cannot engage these screws. A matching hollow-tip security driver is required.
Torx Screwdriver Sizes by Application
Different industries rely on different parts of the Torx size range. Grouping sizes by application helps buyers choose sets that match real work requirements.
Electronics and Precision Work (T1 – T10)
Small Torx sizes are standard in consumer electronics. Smartphones, laptops, hard drives, cameras, and game consoles use T3, T4, T5, T6, and T8 screws. Precision drivers with rotating caps and slim handles make this work easier and reduce the risk of damaging delicate components. Browse our electronics repair tools for related professional equipment.
Appliances and Light Equipment (T10 – T25)
Household appliances, power tools, bicycles, and light machinery often use T10, T15, T20, and T25 fasteners. A standard screwdriver set with these sizes handles most repair and assembly tasks in this range.
Automotive and Machinery (T20 – T55)
Automotive work uses a wide spread of Torx sizes. Interior trim may use T15 or T20. Brake calipers commonly use T25, T30, T40, or the specialized T47 size found on many GM vehicles. Engine and chassis fasteners may require T45, T50, or T55 drivers.
For automotive repair shops and mobile service teams, a set covering T10 through T55 is a practical investment. Many technicians also keep T-handle drivers and socket-style Torx bits for high-torque fasteners. See our automotive repair tools category for related equipment.
Heavy Industrial and Infrastructure (T40 – T100+)
Large machinery, agricultural equipment, rail systems, and wind turbines use Torx sizes from T40 up to T100 and beyond. These fasteners require heavy-duty socket drivers, impact-rated bits, and sometimes powered drivers.
Features of a Quality Torx Screwdriver Set
Not all screwdriver sets offer the same value. For B2B buyers sourcing tools for resale or professional use, these features matter:
Hardened Steel Construction
High-quality Torx bits are made from chrome vanadium or S2 steel and heat-treated for hardness. This reduces tip wear, especially when drivers are used with impact tools or high torque.
Precision-Machined Tips
A well-machined tip fits the recess tightly. Loose or poorly formed tips slip under load and damage fasteners. Look for sets with tight dimensional tolerances and consistent geometry across all sizes.
Ergonomic Handles
For hand drivers, a comfortable grip reduces fatigue during extended use. Textured composite handles and rounded profiles improve control. For technicians who work long shifts, handle design directly affects productivity.
Organized Storage
A labeled case or rack keeps sizes sorted and easy to find. This is especially important for sets with many small precision sizes. Good storage also protects tips from corrosion and damage.
Magnetic Tips
Magnetic tips hold screws during assembly and retrieval, which speeds up work and reduces dropped fasteners. This feature is valuable in electronics repair, automotive work, and manufacturing.
Buying Tips for Torx Screwdrivers
When selecting a torx screwdriver set for professional use, consider the application range, build quality, and how the set will be stored and used.
Match the Set to the Work
A 6-piece set with T10, T15, T20, T25, T30, and T40 covers common automotive and general repair work. Electronics-focused teams need a precision set from T1 to T10. Industrial maintenance teams should look for sets that include T40 through T55 or higher.
Look for Durable Materials
S2 steel and chrome vanadium steel offer good balance between hardness and toughness. For impact-rated applications, choose bits specifically rated for impact drivers to avoid shattering.
Consider Custom and OEM Options
If you are a distributor or brand owner, OEM screwdriver sets can be configured with your branding, case design, and size selection. Factory-direct manufacturing allows you to match the set to your target market while controlling cost and margin.
For buyers interested in custom tool programs, our factory-direct manufacturing team supports flexible specifications and scalable production.
Torx Screwdriver Applications by Industry
Torx screws are used wherever vibration, torque, or tampering resistance matters. The consistent engagement between driver and fastener makes Torx a preferred choice across many industries.
Electronics Assembly and Repair
Smartphones, laptops, gaming consoles, and cameras rely on small Torx fasteners. Precision drivers with matching T1 through T10 sizes are essential for repair technicians and assembly workers.
Automotive Manufacturing and Service
Engine components, brake systems, interior trim, and transmission assemblies use Torx screws. The design resists cam-out under high torque and stays secure under vibration, which is critical for vehicle safety.
Industrial Machinery
Manufacturing equipment, packaging machinery, and automated systems use Torx fasteners in sizes from T20 to T60. Torx Plus is especially common in high-torque assembly lines where fastener life and repeatability matter.
Security and Public Equipment
Tamper-resistant Torx screws are used in public fixtures, medical devices, and access panels. The center pin prevents removal with standard tools, making these screws a simple deterrent against unauthorized access.
Frequently Asked Questions
What are the most common Torx screwdriver sizes?
The most common sizes are T10, T15, T20, T25, T30, and T40. These six sizes cover the majority of automotive, appliance, and general repair work.
What is the most common Torx screwdriver size?
T25 is the most common Torx screwdriver size, followed by T10, T20, and T30. These four sizes handle the majority of brake calipers, appliance housings, automotive trim, and general equipment fasteners.
What are Torx sizes in order?
Torx sizes increase as the T-number increases. Common groupings include:
- T1, T2, T3, precision electronics and micro devices
- T4, T5, T6, laptops, hard drives, and small appliances
- T8, T9, T10, electronics, appliances, and light automotive
- T15, T20, T25, automotive, bicycles, and machinery
- T27, T30, T40, heavy machinery, chassis, and structural fasteners
- T45 through T100+, industrial, agricultural, and infrastructure equipment
How do I know what size Torx screwdriver I need?
Check the screw head for a size marking, measure the recess with a Torx gauge, or test a driver that fits snugly without forcing. The correct driver should enter the recess fully and turn without slippage.
What is the difference between Torx and Torx Plus?
Torx Plus uses a modified six-lobe shape with more contact area. It handles higher torque and lasts longer in high-volume assembly. Torx Plus drivers and screws are marked with “IP” instead of “T” and are not compatible with standard Torx.
Can I use a Torx bit in an impact driver?
Yes, but only if the bit is impact-rated. Standard bits can crack or shatter under impact loads. For automotive and industrial work, choose impact-rated Torx bits made from high-grade steel.
What size is a T25 Torx screwdriver?
A T25 Torx screwdriver has a point-to-point tip width of approximately 0.173 inches or 4.43 mm. It is commonly used for brake calipers, automotive trim, and construction fasteners.
Are Torx and star screwdriver sizes the same?
Yes. Torx is the formal name for the six-lobe drive system. “Star screwdriver” is a common informal term, and the star screwdriver sizes use the same T-number system. A T20 Torx driver fits a T20 star screw perfectly.
What is a Torx screwdriver?
A Torx screwdriver is a hand tool with a six-lobe, star-shaped tip designed to drive Torx screws. It distributes torque evenly across the recess, which reduces cam-out and protects both the fastener and the driver.
Conclusion
A complete torx screwdriver sizes chart is the fastest way to match the right driver to the right fastener. From T1 precision work to T100+ industrial assemblies, Torx tools deliver reliable torque transfer and reduce damage caused by slippage.
For professional buyers, the right torx screwdriver set balances coverage, durability, and cost. Match the size range to your application, choose quality materials, and make sure the set is easy to organize in the field or on the production line.
If you are sourcing Torx screwdrivers for resale, OEM programs, or professional use, our factory-direct manufacturing team can help you build a set that fits your market. Browse our screwdriver category or contact us to discuss custom specifications, packaging, and scalable production.
