T-Slot Bolts for Aluminum Extrusion Frames — Secure Every Joint Without Disassembly
When you're mid-build on an aluminum extrusion frame and realize your fasteners don't slide cleanly into the channel, the whole project stalls. T-slot bolts are the go-to solution for makers, CNC builders, and workshop fabricators who need a fastener that drops into a T-slot profile and locks down with a single wrench turn — no drilling, no tapping, no teardown.
These T-slot bolts are machined from 8.8 grade steel with a black oxide finish, covering thread diameters from M6 through M36 (approximately 0.24" to 1.42"). Both fully threaded and partially threaded variants are available, with lengths ranging from 16 mm to 300 mm (roughly 0.63" to 11.8"). Packs are offered in quantities of 1, 2, 5, or 10 pieces to match your project scale.
Typical use cases include 20×20 and 40×40 aluminum extrusion assemblies for 3D printer frames, laser cutter enclosures, and modular workbench systems. The black oxide coating also suits PC case modding and electronics enclosure builds where a clean, dark hardware aesthetic matters. Larger diameters (M24–M36) are well suited to heavy-duty industrial jigs and fixture tables.
⚙️ Compatible with standard T-slot aluminum extrusion profiles — verify your slot width before ordering. Common fits include 5 mm, 6 mm, and 8 mm slot widths depending on profile series.
✅ Key Features of These T-Slot Bolts
🔩8.8 Grade Steel ConstructionRated to 800 MPa tensile strength, these bolts handle the clamping loads typical of structural extrusion joints without yielding under torque.
🖤Black Oxide FinishThe black oxide surface treatment provides mild corrosion resistance and a uniform dark appearance suited to both functional and aesthetic builds.
📐Wide Size Range: M6 to M36A single product line covers light-duty M6 joints up to heavy M36 structural connections, reducing the need to source from multiple suppliers.
🔄Fully Threaded & Part Threaded OptionsFully threaded variants maximize clamping flexibility across the bolt length; part threaded variants provide a smooth shank for precise alignment in close-tolerance slots.
📦Flexible Pack QuantitiesAvailable in 1, 2, 5, or 10-piece packs — order exactly what your build requires without overstocking hardware you won't use.
🏗️Designed for T-Slot Extrusion SystemsThe bolt head geometry is sized to seat and rotate within standard T-slot channels, allowing tool-free positioning before final tightening.
📐 Technical Specifications — T-Slot Bolts
| Material |
8.8 Grade Steel |
| Surface Finish |
Black Oxide |
| Thread Standard |
Metric (ISO) |
| Thread Diameter |
M6 – M36 |
| Length Range |
16 mm – 300 mm (0.63" – 11.8") |
| Thread Type |
See variant options (Fully Thread / Part Thread) |
| Pack Quantity |
See variant options (1 / 2 / 5 / 10 pcs) |
| Head Style |
T-Slot (Hammer / Square Head) |
| Drive Style |
See variant options |
| Grade / Strength Class |
8.8 (800 MPa tensile) |
| Compatible Profile Slot Width |
Contact us to confirm |
❓ Frequently Asked Questions
How do I know which size T-slot bolt fits my extrusion profile?
Match the bolt's thread diameter to the nut or insert you're using in the slot, and verify the slot width of your extrusion series (common widths are 5 mm, 6 mm, and 8 mm). For example, a 20-series profile typically uses M4 or M5 hardware, while 40-series and 80-series profiles commonly accept M6 through M8. For M10 and above, confirm the slot opening can accommodate the bolt head before ordering.
What is the difference between fully threaded and part threaded T-slot bolts?
Fully threaded bolts have threads running the entire length of the shank, giving you maximum flexibility to adjust clamping depth anywhere along the bolt. Part threaded bolts have a smooth unthreaded shank section near the head, which helps with precise alignment in close-tolerance applications and reduces the risk of thread galling in the slot channel.
Are these bolts corrosion resistant for outdoor or humid environments?
The black oxide finish provides mild corrosion resistance suitable for indoor workshop and dry environments. For outdoor exposure, high-humidity conditions, or contact with corrosive chemicals, we recommend applying a light coat of oil or considering stainless steel alternatives. Black oxide alone is not a substitute for galvanizing or plating in harsh environments.
Can I use these T-slot bolts with standard hex nuts instead of T-slot nuts?
Yes — the thread form is standard metric ISO, so these bolts are fully compatible with standard hex nuts, flange nuts, and nylon lock nuts of the matching thread diameter. They are not limited to T-slot nut applications and can be used in any standard metric fastening scenario.
How do I choose between M6, M8, M10, and larger diameters for my project?
For light-duty frames and enclosures (3D printers, small CNC routers), M6 and M8 are typically sufficient. For mid-duty workbenches, laser cutter frames, and modular fixtures, M10 and M12 are common choices. M16 through M36 are suited to heavy structural connections, industrial jigs, and high-load fixture tables. When in doubt, consult the load rating of your extrusion profile and size the bolt to match.
What torque should I apply when tightening these 8.8 grade bolts?
Recommended tightening torque varies by diameter: M6 bolts are typically torqued to 9–11 Nm, M8 to 22–25 Nm, M10 to 43–49 Nm, and M12 to 75–86 Nm. For M16 and above, consult a standard metric torque table for 8.8 grade fasteners. Always use a calibrated torque wrench and avoid over-tightening, which can strip threads or crack the extrusion profile.
Are these bolts compatible with both metric and imperial extrusion systems?
These bolts use metric thread forms (ISO standard) and are designed for metric T-slot extrusion profiles. They are not directly compatible with imperial (inch-based) threaded inserts or nuts. If your extrusion system uses inch hardware, please contact us to confirm compatibility before ordering.
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