--- title: "What Are Ball-End Hex Keys Used For?" description: "Ball-End Hex Keys (ISO 2936 (hexagon socket screw keys)) are used for installing, adjusting or servicing the assembly rather than forming part of it." url: https://engineeringhardware.com/applications/ball-end-hex-keys/ source: Engineering Hardware & Fasteners --- # What Are Ball-End Hex Keys Used For? Tools · ISO 2936 (hexagon socket screw keys) · Application guide Typical applications, the industries that specify ball-end hex keys, and how to choose the right size, material and finish for the joint. Ball-End Hex Keys are used for installing, adjusting or servicing the assembly rather than forming part of it. They are manufactured to ISO 2936 (hexagon socket screw keys), 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 2936 (hexagon socket screw keys) - **Nominal size range:** 1.5 mm to 14.0 mm - **Category:** Tools Application notes are general engineering guidance. Verify the property class and any approval requirement against your own design calculation. ![What Are Ball-End Hex Keys Used For? application image](https://engineeringhardware.com/wp-content/uploads/2026/09/Ball-End-Hex-Keys.webp) Ball-End Hex Keys 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 2936 (hexagon socket screw keys) type covers concrete end-uses, the specification checklist, correct installation, and where an alternative fastener performs better. Stocked across roughly 1.5 mm to 14 mm, they cover general to heavy-duty work. ## Typical Applications for Ball-End Hex Keys 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 1.5 mm–14 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 2936 (hexagon socket screw keys). Quoting the standard on your order guarantees interchangeable dimensions between suppliers. ## Where Ball-End Hex Keys 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 ball-end hex keys 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 1.5 mm Ball-End Hex Keys to ISO 2936 (hexagon socket screw keys). Side view and top view, drawn to the dimensions in the table below and redrawn for any size selected. - **Mating socket screw:** M2 socket head cap screw - **Ball end used for:** reaching and running down at an angle - **Plain end used for:** final tightening ## Dimensions & Specifications (ISO 2936 (hexagon socket screw keys)) | Key size across flats | Mating socket screw | Ball end used for | Plain end used for | | --- | --- | --- | --- | | 1.5 mm | M2 socket head cap screw | reaching and running down at an angle | final tightening | | 2.0 mm | M2.5 socket head cap screw | reaching and running down at an angle | final tightening | | 2.5 mm | M3 socket head cap screw | reaching and running down at an angle | final tightening | | 3.0 mm | M4 socket head cap screw | reaching and running down at an angle | final tightening | | 4.0 mm | M5 socket head cap screw | reaching and running down at an angle | final tightening | | 5.0 mm | M6 socket head cap screw | reaching and running down at an angle | final tightening | | 6.0 mm | M8 socket head cap screw | reaching and running down at an angle | final tightening | | 8.0 mm | M10 socket head cap screw | reaching and running down at an angle | final tightening | | 10.0 mm | M12 socket head cap screw | reaching and running down at an angle | final tightening | | 14.0 mm | M16 socket head cap screw | reaching and running down at an angle | final tightening | 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 Ball-End Hex Keys used for? Installing, adjusting or servicing the assembly rather than forming part of it. They are supplied to ISO 2936 (hexagon socket screw keys). ### Which industries use Ball-End Hex Keys? 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 Ball-End Hex Keys? Select on nominal size and on the fit the assembly requires. This product is available from 1.5 mm to 14 mm; the full dimension table on this page lists each size. ### Are Ball-End Hex Keys made to a recognized standard? Yes — they are manufactured to ISO 2936 (hexagon socket screw keys), so dimensions are interchangeable between suppliers when you quote the standard on your order. ### Can I get a quote for Ball-End Hex Keys 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: [Ball-End Hex Keys — specifications & sizes](https://engineeringhardware.com/fastener/ball-end-hex-keys/) ### Ball-End Hex Keys Specification Guides ### Related Fastener Applications