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Essential Metric Socket Head Screws for 3D printers, CNC machines, aluminum extrusion frames, robotics, fixtures, brackets, panels, and custom mechanical assemblies.
Price range: $0.09 through $76.99
Metric Socket Head Screws are one of the most useful fasteners for 3D printers, CNC machines, aluminum extrusion frames, robotics, laser engravers, electronics mounts, brackets, panels, fixtures, jigs, and custom mechanical assemblies. This product listing includes a wide range of metric socket screws in multiple head styles, thread sizes, and lengths, making it easier to choose the right fastener for your build.
With 489 available variants, this listing covers socket head cap screws, button head socket screws, and flat head socket screws in sizes from M2 to M6. Length options range from 6mm to 55mm, depending on the selected screw type and thread size. Whether you are repairing a printer, assembling a CNC bracket, mounting a linear rail, attaching panels, or building a custom frame, these metric fasteners are practical shop essentials.
Socket head cap screws are commonly used when strength, tool engagement, and a clean machine-style appearance are important. Button head socket screws provide a lower-profile rounded head that works well for covers, brackets, guards, printed parts, and visible assemblies. Flat head socket screws are designed for countersunk holes where the screw head needs to sit flush with the surface.
This metric screw listing includes common machine-building sizes such as M2, M2.5, M3, M4, M5, and M6. Smaller sizes such as M2 and M2.5 are useful for electronics, small brackets, sensors, and compact 3D printer parts. M3 screws are widely used in 3D printers, linear rails, fans, printed parts, and motion hardware. M4, M5, and M6 screws are often used for stronger brackets, aluminum extrusion hardware, CNC components, panels, and structural assemblies.
Metric Socket Head Screws are commonly used throughout machine builds and workshop projects. They pair well with T-slot nuts, threaded inserts, heat-set inserts, linear rails, guide blocks, motor mounts, brackets, joining plates, bearing holders, end stops, electronics mounts, and custom fabricated parts. If you build or repair 3D printers, CNC equipment, laser machines, robotics platforms, or shop fixtures, keeping a range of metric socket screws available can save time during assembly and troubleshooting.
Use cap head screws when you want strong hex socket engagement and a standard machine-building fastener. Use button head screws when you need a cleaner, lower-profile visible fastener. Use flat head screws when the part has a countersunk hole and the screw must sit flush. Always match the screw diameter, length, head style, and thread type to the part, bracket, extrusion nut, or threaded insert you are using.
For aluminum extrusion assemblies, pair these screws with compatible Hammerhead T-Slot Nuts and related hardware in the Fasteners category. For machine motion systems, browse the Linear Guide Rail and Motion Components category for rails, guide blocks, bearings, and smooth rods.
Metric socket screws are standardized machine fasteners used across mechanical assemblies, equipment frames, and precision hardware. For general engineering reference on metric socket head screw standards and dimensions, see this socket cap screw technical reference.
Every order is hand-inspected and precision-shipped from dnb3D in Marathon, Ontario. Whether you are repairing a 3D printer, assembling a CNC machine, upgrading an aluminum extrusion frame, or stocking your parts drawer, these Metric Socket Head Screws give you reliable fastening options for precision builds and everyday shop projects.
This product includes metric socket head screws in multiple head styles, thread sizes, and lengths. Select the correct variant before adding to cart.
| Product Type | Metric socket head machine screws |
|---|---|
| Available Head Styles | Socket head cap screw, button head socket screw, flat head socket screw |
| Available Thread Sizes | M2, M2.5, M3, M4, M5, M6 |
| Available Lengths | 6mm to 55mm, depending on selected screw style and diameter |
| Drive Type | Internal hex socket / Allen key drive |
| Thread Type | Metric machine thread |
| Common Materials | Steel / alloy steel depending on selected variant |
| Common Finish | Black oxide, zinc plated, stainless, or variant-specific finish depending on stock |
| Common Applications | 3D printers, CNC machines, robotics, aluminum extrusion frames, brackets, panels, linear rails, printed parts, fixtures, jigs, electronics mounts, and machine repairs |
| Compatible Hardware | T-slot nuts, threaded inserts, heat-set inserts, tapped holes, brackets, plates, and compatible machine hardware |
| Variant Count | 489 available screw variants |
| Fulfillment | Hand-inspected and precision-shipped from dnb3D in Marathon, Ontario, Canada |
| Thread Size | Light Assembly Torque Range |
|---|---|
| M2 | 0.15–0.25 N·m / 1.3–2.2 in-lbs |
| M2.5 | 0.3–0.5 N·m / 2.7–4.4 in-lbs |
| M3 | 0.6–0.8 N·m / 5.3–7.1 in-lbs |
| M4 | 1.4–2.0 N·m / 12.4–17.7 in-lbs |
| M5 | 3.0–4.5 N·m / 26.5–39.8 in-lbs |
| M6 | 5.0–7.5 N·m / 44.3–66.4 in-lbs |
Note: Torque values are general light assembly guidance only. Actual torque depends on screw grade, material, finish, lubrication, thread engagement, mating material, and application. Use lower torque for plastic parts, printed parts, soft aluminum, and small threaded inserts.
Before installation, confirm the screw diameter, length, head style, and thread compatibility. A screw that is too short may not provide enough thread engagement, while a screw that is too long may bottom out, damage the part, or prevent proper tightening.
Use socket head cap screws for strong general-purpose machine fastening. Use button head screws where a lower-profile rounded head is preferred. Use flat head screws only with properly countersunk holes so the head can sit flush with the surface.
Always use the correct Allen key or hex driver size for the selected screw. A worn or incorrect tool can strip the socket, damage the fastener, or make future removal difficult. Apply firm, straight pressure while tightening.
Use reasonable torque for the screw size and material being fastened. Over-tightening can strip threads, crush printed parts, deform aluminum, damage threaded inserts, or strip the internal hex socket. For plastic parts, 3D printed parts, and soft materials, start with light torque and increase only as needed.
For a secure assembly, make sure the screw has enough thread engagement in the nut, insert, or tapped hole. As a general rule, aim for at least the screw diameter in thread engagement for metal parts when possible. More engagement may be required for soft materials or high-load assemblies.
For vibrating equipment such as 3D printers, CNC machines, routers, robotics, and moving assemblies, a removable threadlocker may help prevent screws from loosening. Use only a small amount and confirm compatibility with plastics before applying.
Metric screws can look similar across sizes and lengths. Store fasteners by diameter, length, and head style to avoid assembly mistakes. Mixing M2.5, M3, and M4 screws can easily lead to stripped threads or incorrect fitment.
Every order is hand-inspected before shipping. dnb3D precision-ships metric fasteners and machine-building hardware across Canada from our Ontario facility, helping builders, makers, and machine owners receive clean, usable parts ready for careful installation.
At dnb3D, we don’t just ship boxes—we manufacture solutions. Operating our Industry 4.0 micro-factory in Marathon, Ontario, means your order is handled by the same people who design and test these components.
Ready to Ship (3D Printer Parts & Hardware): Finished, inspected, and on the shelf. Dispatched within 1 to 2 business days.
In-House Manufacturing (Laser, Plasma, 3D Prints): These items are manufactured “fresh” to order. Please allow 3 to 5 business days for precision cutting and finishing.
Custom Projects: Bespoke designs require a consultation and a locked-in timeline before production begins.
We ship nationwide across Canada and the USA. Centrally located on the North Shore of Lake Superior, we are uniquely positioned to get your products moving quickly to either coast.
We stand behind every weld, cut, and print. If a product doesn’t meet your expectations, contact the Hub within 30 days. If we wouldn’t put it in our own shop, we won’t let it sit in yours.
Standard Items: Contact us within 30 days for return authorization. Items must be in original, unused condition.
Custom/Personalized Orders: Digitally fabricated to your exact specs (names, custom dimensions, or unique finishes) are final sale once production begins.
Shipping Costs: Return shipping is the responsibility of the customer unless the item arrived damaged or defective.
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