M4 T - Bolts for T - Slot Aluminum Extrusion — Square Head Stainless Steel 304 (A2), M4×12mm to M4×30mm - HomeDIYer

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M4 T-Bolts for T-Slot Aluminum Extrusion — Square Head Stainless Steel 304 (A2), M4×12mm to M4×30mm

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Sizes: M4*12mm

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M4 T-Bolts for T-Slot Aluminum Extrusion — Secure Every Joint in Your Frame Build

If you have ever had a joint shift mid-print or a CNC fixture creep under load, you know how critical the right fastener is. Makers, fabricators, and workshop builders who work with T-slot aluminum extrusion profiles need M4 T-bolts that drop into the channel cleanly, lock without spinning, and stay put under vibration. These M4 square head T-bolts are built for exactly that job.

Each bolt features a square head profile machined to fit the T-slot channel of standard aluminum extrusion systems, with a fully threaded shank in 304 stainless steel (A2). Available in five lengths — M4×12mm (≈1/2"), M4×16mm (≈5/8"), M4×20mm (≈3/4"), M4×25mm (≈1"), and M4×30mm (≈1-3/16") — and in quantities from 1 to 200 pieces per order, so you can grab a single replacement or stock up for a full build.

Typical use cases include 3D printer frame assembly (V-slot and 2020/2040 extrusion builds), CNC router gantry and spoilboard clamping, modular workbench and jig systems, and T-slot aluminum extrusion profile connections in industrial fixtures. The corrosion-resistant A2 finish also makes these suitable for light outdoor enclosures and food-adjacent workshop environments.

🔩 Compatibility: Designed for standard T-slot aluminum extrusion profiles with a 6mm slot width — typically 20-series (20×20, 20×40, 20×60) and 30-series profiles. Verify your profile's slot width before ordering.

✅ Key Features of These M4 Square Head T-Bolts

🔲Square Head T-Slot Design — The square head profile drops into the T-slot channel and rotates 90° to lock in place, eliminating the need for a separate T-nut on the bolt-head side and speeding up assembly on aluminum extrusion frames.
🦾304 Stainless Steel (A2) Construction — Resists rust, oxidation, and mild chemical exposure. A2 stainless is a step up from zinc-plated carbon steel for workshop environments where moisture, coolant mist, or outdoor exposure is a factor.
📏Five Length Options in One Listing — M4×12mm through M4×30mm covers the most common stack thicknesses in T-slot extrusion builds, from thin bracket connections to thicker gantry plates and multi-layer fixture stacks.
📦Flexible Quantity Tiers (1–200 pcs) — Order a single bolt for a quick repair or 200 pieces for a full production run. Per-unit cost drops significantly at higher quantities, making bulk orders practical for workshop restocking.
⚙️Standard M4 × 0.7mm Thread Pitch — ISO metric coarse thread is compatible with standard M4 hex nuts, flange nuts, and T-nuts used across all major aluminum extrusion systems including Misumi, Bosch Rexroth, and OpenBuilds-style profiles.
🔄Reusable and Repositionable — Unlike adhesive or press-fit fasteners, these T-bolts can be loosened, slid to a new position along the extrusion channel, and re-tightened — ideal for adjustable jigs, modular workbenches, and iterative CNC router setups.

📐 Technical Specifications — M4 Square Head T-Bolts

Thread Size	M4
Thread Pitch	0.7mm (ISO metric coarse)
Available Lengths	12mm (≈1/2") / 16mm (≈5/8") / 20mm (≈3/4") / 25mm (≈1") / 30mm (≈1-3/16")
Head Type	Square head (T-slot profile)
Material	Stainless Steel 304
Grade / Designation	A2 (per ISO 3506)
Tensile Strength	Generally 500–700 MPa (A2-70 class)
Compatible Slot Width	Typically 6mm T-slot (20-series and 30-series extrusion)
Drive Type	See variant options (square head — tightened via nut on threaded end)
Finish	Natural stainless (no coating)
Quantity Options	1 / 5 / 10 / 20 / 30 / 40 / 50 / 100 / 200 pcs per order
Country of Origin	Contact us to confirm

⚠️ Heads up: Square head dimensions (head width and height) vary slightly by manufacturer. If your T-slot channel has tight tolerances, contact us to confirm head dimensions before ordering in bulk.

❓ Frequently Asked Questions

How do I choose the right bolt length for my T-slot profile?

Measure the total stack thickness of the parts you are clamping, then add the thread engagement depth — typically 1.5× the bolt diameter for steel nuts. For M4 bolts, that is generally 6mm of thread engagement. So for a 10mm plate, an M4×16mm (≈5/8") bolt is typically the right choice. When in doubt, size up one increment.

Quick reference: M4×12mm suits thin brackets and direct profile-to-profile connections; M4×20mm–25mm works well for most gantry plates and fixture blocks; M4×30mm is suited for thicker stacks or when adding a washer and lock nut.

What clamping load can these M4 T-bolts handle?

Grade A2 (304) stainless steel M4 bolts have a proof load of approximately 3.2 kN and a tensile strength of generally 500–700 MPa. Actual clamping force depends on torque applied and lubrication. For structural T-slot frames, always verify load requirements against your specific profile manufacturer's data.

Are these bolts suitable for outdoor or corrosive environments?

Yes. 304 stainless steel (A2) provides good resistance to atmospheric corrosion, moisture, and mild chemicals. It is generally suitable for outdoor use, light marine environments, and food-adjacent applications. For highly chloride-rich or saltwater environments, 316 (A4) stainless is typically recommended instead.

Which T-slot profile sizes are these bolts compatible with?

These M4 square head T-bolts are designed to slide into the T-slot channel of standard aluminum extrusion profiles — typically 20-series (20×20, 20×40, 20×60) and 30-series profiles with a 6mm slot width. Always verify your profile's slot width and nut channel dimensions before ordering.

They are commonly used with OpenBuilds V-slot, Misumi HFS5, Bosch Rexroth 20mm series, and similar metric extrusion systems.

Do these T-bolts require a special nut, or can I use standard M4 nuts?

The square head is designed to lock into the T-slot channel of aluminum extrusion profiles, so no separate T-nut is needed on the bolt-head side. On the clamping side, standard M4 hex nuts, flange nuts, or T-nuts can be used depending on your assembly design.

How many bolts should I order for a typical CNC router or 3D printer frame build?

A typical 3D printer or small CNC frame build uses anywhere from 20 to 80 T-bolts depending on the number of joints and accessories. For a first build, ordering a 50-pack of your primary length gives you spares for adjustments. For production or workshop use, the 100- or 200-piece options offer the best per-unit value.

What is the thread pitch for these M4 bolts?

M4 bolts use a standard metric coarse thread pitch of 0.7mm per the ISO 68-1 standard. This is the most common M4 thread pitch and is compatible with standard M4 nuts, T-nuts, and threaded inserts used in aluminum extrusion systems.

🛒 Select your size and quantity above, then add to cart — ships from our US warehouse.

M4 T-Bolts for T-Slot Aluminum Extrusion — Square Head Stainless Steel 304 (A2), M4×12mm to M4×30mm

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Beschreibung

M4 T-Bolts for T-Slot Aluminum Extrusion — Secure Every Joint in Your Frame Build

✅ Key Features of These M4 Square Head T-Bolts

📐 Technical Specifications — M4 Square Head T-Bolts

❓ Frequently Asked Questions

M4 T-Bolts for T-Slot Aluminum Extrusion — Square Head Stainless Steel 304 (A2), M4×12mm to M4×30mm

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