--- title: "What Are Torx and Torx-Plus Screwdriver Bits Used For?" description: "Torx and Torx-Plus Screwdriver Bits (ISO 10664 / DIN 3126 C6.3) are used for installing, adjusting or servicing the assembly rather than forming part of it." url: https://engineeringhardware.com/applications/torx-screwdriver-bits/ source: Engineering Hardware & Fasteners --- # What Are Torx and Torx-Plus Screwdriver Bits Used For? Tools · ISO 10664 / DIN 3126 C6.3 · Application guide Typical applications, the industries that specify torx and torx-plus screwdriver bits, and how to choose the right size, material and finish for the joint. Torx and Torx-Plus Screwdriver Bits are used for installing, adjusting or servicing the assembly rather than forming part of it. They are manufactured to ISO 10664 / DIN 3126 C6.3, and selection is driven by the nominal size, the fit and tolerance the assembly requires, and the service environment. - **Primary duty:** Installing, adjusting or servicing the assembly rather than forming part of it - **Governing standard:** ISO 10664 / DIN 3126 C6.3 - **Nominal size range:** T10 to T40 - **Category:** Tools Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Torx and Torx-Plus Screwdriver Bits Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Torx-Screwdriver-Bits.webp) Torx and Torx-Plus Screwdriver Bits are selected when an assembly calls for installing, adjusting or servicing the assembly rather than forming part of it. This application guide to the ISO 10664 / DIN 3126 C6.3 type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly 10 mm to 40 mm, they cover general to heavy-duty work. ## Typical Applications for Torx and Torx-Plus Screwdriver Bits The most common settings where these are specified: - **General machine building:** fastening covers, brackets, motors and sub-assemblies on production equipment. - **Maintenance & repair (MRO):** a stocked size for servicing existing plant where the original fastener spec must be matched. - **Fabrication & metalwork:** bench and on-site assembly of steel frames, enclosures and weldments. 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This product spans 10 mm–40 mm; check the full table below for the exact dimensions of each size. - **Material:** Choose the material and finish for the service environment — plated steel for general use, stainless for corrosion resistance. - **Environment:** For damp, coastal or chemical exposure prefer A4/316 stainless or a suitable coating; indoors, plated steel or A2 is usually sufficient. - **Standard:** This product is supplied to ISO 10664 / DIN 3126 C6.3. Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Where Torx and Torx-Plus Screwdriver Bits Are Not the Right Choice Match the fastener to the load, environment and whether the joint must be reopened; the wrong class or style is the usual cause of joint failure. Custom manufacturing · Made to drawing ## Need a torx and torx-plus screwdriver bits outside the standard range? Dimensions, material, finish and form are specified from the drawing — a fastener tool outside the standard range is a variation on existing tooling rather than a new design. Minimum order from 2,000 pieces; samples within 7 days of drawing approval. [Custom fastener tool manufacturing](https://engineeringhardware.com/custom/tools/)[Send a drawing](https://engineeringhardware.com/custom/tools/#rfq) ## Technical Drawing Dimensioned line drawing of T10 Torx and Torx-Plus Screwdriver Bits to ISO 10664 / DIN 3126 C6.3. Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Drive:** Torx - **Typical mating screw:** M3 hexalobular - **Service:** electronics, appliance ## Dimensions & Specifications (ISO 10664 / DIN 3126 C6.3) | Bit | Drive | Typical mating screw | Service | | --- | --- | --- | --- | | T10 | Torx | M3 hexalobular | electronics, appliance | | T15 | Torx | M3.5 hexalobular | appliance, light assembly | | T20 | Torx | M4 hexalobular | general assembly | | T25 | Torx | M5 hexalobular | decking, general assembly | | T27 | Torx | M5 – M6 hexalobular | construction screws | | T30 | Torx | M6 hexalobular | structural timber screws | | T40 | Torx | M8 hexalobular | heavy assembly | | T20 IP | Torx security (pin-in) | M4 tamper-resistant | public and outdoor equipment | | T25 IP | Torx security (pin-in) | M5 tamper-resistant | public and outdoor equipment | Inside the plant ## Manufactured in our own plant This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided. 1. ![Wire rod feeding into a cold heading machine](https://engineeringhardware.com/wp-content/uploads/2026/08/09-wire-rod-feed-cold-heading-machine.webp) 01 **Cold heading** Wire rod is drawn to size and cold-formed into blanks. Forming rather than cutting keeps the grain flow continuous around the head, which is where a bolt is most likely to fail. Head dimensions and under-head radius checked at set-up and per shift. 2. ![Thread rolling machine producing bolt threads](https://engineeringhardware.com/wp-content/uploads/2026/08/03-thread-rolling-machine-bolt-production.webp) 02 **Thread rolling** Threads are rolled between hardened dies rather than cut. Rolled threads are stronger in fatigue than cut threads and hold pitch and flank angle far more consistently across a batch. Go / no-go ring gauges to ISO 965 tolerance class 6g. 3. ![Baskets of bolts staged for heat treatment](https://engineeringhardware.com/wp-content/uploads/2026/08/05-heat-treatment-baskets-black-bolts.webp) 03 **Heat treatment** Quench-and-temper brings carbon and alloy steel to the property class ordered — 8.8, 10.9 or 12.9 — with the furnace charge tracked so a finished lot can be traced back to it. Core hardness and tensile tested per lot to ISO 898-1. 4. ![Zinc plated bolts in a treatment basket](https://engineeringhardware.com/wp-content/uploads/2026/08/23-zinc-plated-bolts-treatment-basket.webp) 04 **Surface treatment** Zinc, zinc-nickel, hot-dip galvanizing, black oxide, phosphate and Dacromet, selected against the service environment rather than against the price list. Coating thickness and neutral salt spray hours to ISO 9227. ## Frequently Asked Questions ### What are Torx and Torx-Plus Screwdriver Bits used for? Installing, adjusting or servicing the assembly rather than forming part of it. They are supplied to ISO 10664 / DIN 3126 C6.3. ### Which industries use Torx and Torx-Plus Screwdriver Bits? They are commonly specified in general machine building, maintenance & repair (mro) and fabrication & metalwork, among other sectors. ### How do I choose the right size of Torx and Torx-Plus Screwdriver Bits? Select on nominal size and on the fit the assembly requires. This product is available from 10 mm to 40 mm; the full dimension table on this page lists each size. ### Are Torx and Torx-Plus Screwdriver Bits made to a recognized standard? Yes — they are manufactured to ISO 10664 / DIN 3126 C6.3, so dimensions are interchangeable between suppliers when you quote the standard on your order. ### Can I get a quote for Torx and Torx-Plus Screwdriver Bits in the size and material I need? Yes. Use the technical drawing and quote form on this page to set the size and options, then send the exact configuration to our team for pricing and lead time. ## Related Pages Product page: [Torx and Torx-Plus Screwdriver Bits — specifications & sizes](https://engineeringhardware.com/fastener/torx-screwdriver-bits/) ### Torx and Torx-Plus Screwdriver Bits Specification Guides ### Related Fastener Applications