Quick Answer
Most sim rigs use M8 fasteners, but the right choice depends on the slot size and head style. For 8mm T-slot rails, spring-loaded T-nuts with hex screws offer the most secure grip, while countersunk screws work best for pedal plates.
Why M8 is the Standard for Sim Rig Hardware
M8 fasteners are common in aluminum extrusion sim rigs because they match the 8mm T-slot channels found in profiles like the Trak Racer TR80, TR80Lite, TR120, and TR160. The M8 size provides enough strength for load-bearing components like pedal plates and wheel bases without being overly bulky.
When choosing fasteners, you'll encounter different head styles and nut types. Hex screws are versatile and easy to tighten, while countersunk screws sit flush for a cleaner surface. Spring-loaded T-nuts slide into the slot and lock in place, making them ideal for adjustable positions.
M8 Fastener FAQ
What size T-slot nut do I need?
Check the slot width of your aluminum profile. If it's 8mm, you need M8 T-nuts. For wider slots, like 10mm or 15mm, choose the matching size. Measure your slot width before ordering; don't assume all rigs use the same size.
When should I use a countersunk screw?
Use countersunk screws when you need a flush surface, such as on pedal plates or anywhere you don't want protruding hardware. They require a countersunk hole in the component being mounted. If the component doesn't have a countersunk hole, a hex head screw is the safer choice.
What's the difference between a flange nut and a regular nut?
A flange nut has an integrated washer that distributes clamping force over a larger area. This reduces the risk of loosening and can prevent damage to softer materials like carbon fiber or thin aluminum. For high-vibration areas, like a wheel base mount, flange nuts are a good upgrade.
Can I use M8 screws with any T-nut?
M8 screws are compatible with M8 T-nuts, but the screw length must be appropriate for the material thickness. A 16mm screw is typical for mounting components to 15mm profiles, but always verify the thread engagement. Check that the screw doesn't bottom out or protrude too far; aim for at least 6-8mm of thread engagement.
Fastener Options for Your Rig
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Hex Screw and Nut for 8mm T-Slot - Set of 10 or 20: This set includes industrial-grade M8 T-nuts and M8 x 16mm hex screws, designed for 8mm slots with a spring (leaf) type design. The spring-loaded design holds the nut in place while you tighten, preventing it from spinning inside the slot—a big time-saver during assembly.
Hex Screw and Nut for 8mm T-Slot - Set of 10 or 20
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M8 X 16mm Counter Sunk Screws - Set of 6: These M8 x 16mm countersunk screws are commonly used on Trak Racer pedal plates. The flush head avoids protruding hardware, which is useful on pedal plates where your feet might catch on raised screw heads.
M8 X 16mm Counter Sunk Screws - Set of 6
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M8 Flange Nuts - Set of 4: This set of four M8 flange nuts is compatible with TR80, TR80Lite, TR120, and TR160 rigs. Flange nuts have a built-in washer, spreading the load and reducing the chance of loosening under vibration—handy for high-force components.
