M14 x 50mm T-Slot Bolts – Black 8.8 Steel, Full Thread (T-Slot Screws for Aluminum Extrusion)

Generally, measure the total thickness of the parts you are clamping together, then add the depth of the T-slot channel (typically 6–10 mm for 30- and 40-series profiles). This bolt is 50 mm (≈1.97") long, which is typically suitable for clamping material stacks of 30–40 mm with standard 40-series extrusions. When in doubt, choose a slightly longer bolt and use a washer to fine-tune the clamping depth.

These are Grade 8.8 bolts — a medium-high-strength carbon steel fastener classification. The first digit (8) indicates a minimum tensile strength of 800 MPa; the second digit (8) means the yield strength is 80% of tensile strength, or approximately 640 MPa. Grade 8.8 is generally suitable for structural framing, machine guarding, and industrial fixture applications where reliable clamping force is required.

These M14 T-slot bolts are designed to fit T-slot channels with a slot opening wide enough to accept an M14 bolt head — typically found on 40-series and larger aluminum extrusion profiles (e.g., 40×40, 40×80, 80×80). Always verify your extrusion's slot opening width before ordering. If you are unsure, contact us with your profile series and we will confirm compatibility.

The black oxide finish provides mild corrosion resistance compared to bare steel and is generally adequate for indoor workshop environments with occasional moisture exposure. For prolonged outdoor use or high-humidity conditions, we recommend applying a light coat of machine oil or thread locker compound. Contact us if you need stainless steel alternatives for outdoor T-slot applications.

Standard M14 bolts use a coarse thread pitch of 2.0 mm per the ISO metric thread standard. This is the most common pitch for M14 fasteners and is compatible with standard M14 T-nuts, drop-in T-nuts, and threaded inserts used in aluminum extrusion systems. If you need a fine-pitch M14 variant, contact us to confirm availability.

A full-thread bolt — like this one — has threads running the entire length of the shank, giving you maximum thread engagement and flexibility in clamping depth. This is ideal when you need to adjust how deep the bolt sits in the T-slot channel. A partial-thread bolt has a smooth shank section near the head, which can provide better shear resistance in some structural applications. For most T-slot framing and fixture work, full-thread bolts are the preferred choice.

You can select your preferred quantity using the Amount(pcs) option above the Add to Cart button. Available pack sizes are listed in the variant selector — choose the quantity that matches your project needs to get the best value per bolt.