M6 Square Head T-Bolts for T-Slot Aluminum Profiles — Stainless Steel A2 304, 8mm to 60mm
If you've ever had a bolt spin freely inside an aluminum extrusion channel while you're trying to tighten a fixture, you know how frustrating the wrong fastener can be. These M6 square head T-bolts are engineered specifically for T-slot aluminum profile systems, giving makers, fabricators, and workshop builders a fastener that locks in place the moment it's seated — no spinning, no slipping.
Each bolt is machined from A2 stainless steel (AISI 304, A2-70 property class) with a plain finish and a full-thread shank. The square head measures approximately 10mm × 10mm and is sized to fit standard 6mm T-slot grooves found on 20-series and 30-series aluminum extrusion profiles. Available in 13 lengths from 8mm (≈5/16") to 60mm (≈2-3/8"), sold in quantities of 1, 5, 10, 20, 30, 40, 50, or 100 pieces per order.
Typical use cases include building CNC router tables with T-slot work-holding fixtures, assembling modular aluminum frame enclosures for 3D printers and laser cutters, constructing adjustable workbench jigs, and mounting accessories to 80/20-style extrusion systems. The M6 coarse thread (1.0mm pitch) pairs directly with standard M6 T-nuts, flange nuts, and hex nuts.
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Compatibility: Designed for 6mm T-slot grooves on 20-series and 30-series aluminum extrusion profiles (e.g., 20×20, 20×40, 40×40, 30×30). Verify your profile's slot width before ordering — slot dimensions vary by manufacturer.
✅ Key Features of These M6 Square Head T-Bolts
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🔒Self-Locking Square Head — The square head rotates 90° to lock inside the T-slot channel, preventing bolt rotation during tightening and eliminating the need for a second wrench to hold the head.
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🦾A2-70 Stainless Steel Construction — Manufactured from AISI 304 stainless steel to the A2-70 property class, offering a tensile strength typically around 700 MPa and solid resistance to rust and oxidation in workshop and light outdoor environments.
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📏13 Length Options (8mm–60mm) — From compact 8mm (≈5/16") bolts for thin-plate clamping to 60mm (≈2-3/8") bolts for deep-stack assemblies, covering the full range of common T-slot aluminum profile fastening needs.
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🔧Standard M6 Coarse Thread (1.0mm Pitch) — Fully compatible with off-the-shelf M6 T-nuts, hex nuts, and flange nuts; no special hardware required for assembly.
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📦Flexible Quantity Options — Order as few as 1 piece for a quick repair or up to 100 pieces for CNC fixture builds and production-scale aluminum extrusion frame projects, with per-unit cost decreasing at higher quantities.
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✨Plain Finish, No Coating to Flake — The natural stainless finish avoids the peeling or chipping associated with zinc-plated or painted fasteners, keeping your T-slot channels clean and free of debris over time.
📐 Technical Specifications — M6 Square Head T-Bolts
| Thread Size |
M6 (6mm nominal diameter) |
| Thread Pitch |
1.0mm (coarse, standard metric) |
| Head Style |
Square head (external square drive) |
| Head Dimensions |
Approximately 10mm × 10mm (contact us to confirm) |
| Available Lengths |
8mm (≈5/16"), 10mm (≈3/8"), 12mm (≈15/32"), 16mm (≈5/8"), 20mm (≈25/32"), 25mm (≈1"), 30mm (≈1-3/16"), 35mm (≈1-3/8"), 40mm (≈1-9/16"), 45mm (≈1-3/4"), 50mm (≈2"), 55mm (≈2-3/16"), 60mm (≈2-3/8") |
| Material |
Stainless Steel A2 (AISI 304) |
| Property Class |
A2-70 |
| Finish |
Plain (natural stainless, uncoated) |
| System of Measurement |
Metric |
| Compatible Slot Width |
6mm T-slot groove (20-series & 30-series profiles) |
| Compatible Nut Types |
M6 T-nuts, hex nuts, flange nuts (standard metric) |
| Quantity Options |
1, 5, 10, 20, 30, 40, 50, 100 pcs per order |
| Drive Style |
External square (wrench or socket on mating nut) |
| Country of Origin |
See variant options |
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Note: Length is measured as the full shank length (under-head to tip). Always verify your profile's T-slot groove width and depth before ordering. If you need a specific head dimension confirmed, contact us before purchase.
❓ Frequently Asked Questions
How do I choose the right bolt length for my T-slot profile?
Measure the depth of the T-slot channel plus the thickness of the material you are clamping. The bolt shank should generally extend at least 1× the thread diameter beyond the nut face for a secure grip. For example, clamping a 10mm plate into a standard 20-series profile typically calls for a length of 16–20mm (≈5/8"–3/4"). When in doubt, size up one step — a slightly longer bolt with a standard hex nut is easier to work with than one that's too short.
What grade and strength rating are these T-bolts?
These bolts are manufactured from A2 stainless steel (AISI 304), which typically meets the A2-70 property class. That generally corresponds to a minimum tensile strength of 700 MPa and a proof load of approximately 580 MPa for M6 fasteners. For safety-critical structural applications, always confirm load requirements with a qualified engineer.
Can these bolts be used outdoors or in wet environments?
A2 (304) stainless steel offers good corrosion resistance in most outdoor and mildly humid environments. It is generally suitable for indoor workshops, light outdoor enclosures, and non-marine applications. For coastal or chloride-rich environments where salt spray is present, A4 (316) stainless is typically recommended instead.
Which T-slot profile sizes are these M6 bolts compatible with?
M6 square head T-bolts are commonly used with 20-series (20×20, 20×40, 40×40) and 30-series aluminum extrusion profiles that feature a 6mm T-slot groove. They are also compatible with many 80/20-style and Bosch Rexroth-style profiles with a 6mm slot. Always verify the slot width of your specific profile before ordering, as slot dimensions can vary by manufacturer and series.
Do I need a special tool to install square head T-bolts?
No special tool is required. The square head is designed to self-lock inside the T-slot channel when rotated 90°, preventing rotation during tightening. Simply slide the bolt into the slot opening, rotate it to lock, then tighten the mating nut with a standard wrench or socket. No access to the bolt head is needed once it's seated.
What thread pitch do these M6 bolts use, and what nuts are compatible?
These bolts use the standard M6 coarse thread pitch of 1.0mm — the default metric pitch for M6 fasteners. They are compatible with standard M6 T-nuts, hex nuts, flange nuts, and nylon-insert lock nuts. No special or fine-pitch hardware is required.
How do I decide between buying 1 pc vs. a bulk pack?
Single pieces are ideal for repairs or prototyping where you need just one or two fasteners. Packs of 10–50 suit most DIY frame builds, 3D printer enclosures, and workbench jig projects. The 100-piece option offers the lowest per-unit cost and is well-suited for production runs, CNC router table fixture setups, or workshop builds where you'll use many fasteners of the same size.
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