What is the tensile strength of A2-304 stainless steel bolts?

A2-304 stainless steel bolts are typically rated to property class 70, with a minimum tensile strength of 700 MPa (approximately 101,500 psi). For structural or high-vibration applications, confirm load requirements with an engineer.

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M8 T-Bolt Square Head Bolt for T-Slot Aluminum Profile — Stainless Steel A2 304

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Sizes: M8*12mm

Amount: 1 pcs

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M8 T-Bolt Square Head Bolt for T-Slot Aluminum Extrusion — Secure, Slide-In Fastening Without Drilling

Anyone who has built a CNC router frame, 3D printer enclosure, workbench, or modular aluminum extrusion structure knows the frustration of bolts that spin in the channel, strip under torque, or require drilling new holes every time the layout changes. These M8 stainless steel T-bolts are designed specifically for builders, fabricators, and makers who need a reliable, repositionable fastener that locks into standard T-slot aluminum profiles without any modification to the extrusion.

Each piece is a single M8 square head T-bolt machined from A2-304 stainless steel, available in lengths from 12mm (≈1/2") to 80mm (≈3-1/8") to cover a wide range of clamping depths. The square head profile matches the internal geometry of standard 8mm T-slot channels found on 40-series and 45-series aluminum extrusion profiles. Order 1 or 2 pieces per listing to match your exact project quantity.

Typical applications include T-slot aluminum frame assembly for CNC machines and laser cutters, modular workstation and workbench construction, 3D printer enclosure builds, and industrial fixture and jig setups where components need to be repositioned without re-drilling. The corrosion-resistant A2-304 grade also makes these suitable for light outdoor structures, greenhouse frames, and humid workshop environments.

🔩 Compatibility: Designed for standard 8mm T-slot aluminum extrusion profiles — typically 40-series (40×40mm) and 45-series. Thread: M8 metric coarse (1.25mm pitch). Verify your profile's slot width before ordering.

✅ Key Features of These M8 T-Slot Square Head T-Bolts

🔲 Self-Aligning Square Head — The square head geometry locks into the T-slot channel and prevents rotation during tightening, giving you a solid one-wrench installation without a second person holding the bolt.
🦀 A2-304 Stainless Steel Construction — Resists rust, oxidation, and mild chemical exposure, making these T-bolts suitable for both indoor workshop builds and light outdoor aluminum extrusion structures.
📏 13 Length Options (12mm–80mm) — From 12mm (≈1/2") for shallow bracket connections to 80mm (≈3-1/8") for deep stack assemblies, so you can match the bolt to your actual clamping depth rather than cutting or shimming.
🔄 Fully Repositionable — No Drilling Required — Slides freely along the T-slot channel before tightening, letting you adjust component positions during assembly or reconfigure your frame layout without any new holes.
⚙️ Standard M8 Metric Thread (1.25mm Pitch) — Compatible with any M8 hex nut, flange nut, or Nyloc nut (DIN 934 / ISO 4032), so you can source mating hardware locally without hunting for proprietary parts.
🧩 Sold in 1 or 2-Piece Quantities — Buy exactly what your project needs — no forced bulk packs. Useful for replacing a single damaged fastener or adding one more connection point to an existing frame.

📐 Technical Specifications — M8 Square Head T-Bolt for Aluminum Extrusion

Thread Size	M8 (metric coarse, 1.25mm pitch)
Head Type	Square head (T-bolt profile)
Material	Stainless Steel A2-304
Available Lengths	12mm (≈1/2"), 16mm (≈5/8"), 20mm (≈3/4"), 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"), 70mm (≈2-3/4"), 80mm (≈3-1/8")
Compatible Slot Width	8mm T-slot (typically 40-series and 45-series aluminum extrusion profiles)
Tensile Strength	Typically 700 MPa (property class 70 for A2 stainless)
Finish	Natural stainless (no coating)
Quantity per Order	1 pcs or 2 pcs (see variant options)
Thread Standard	ISO metric (DIN 933 / DIN 931 profile)
Corrosion Resistance	Suitable for indoor, humid, and light outdoor use; not rated for continuous saltwater immersion
Country of Origin	Contact us to confirm

⚠️ Heads up: Slot compatibility varies by extrusion manufacturer. Always measure your profile's T-slot width and confirm it is 8mm before ordering. If you're unsure, contact us with your profile brand and series.

❓ Frequently Asked Questions

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

Measure the total thickness of the parts being clamped together, then add the depth of the T-slot channel (typically 3–4mm for standard 40-series profiles). Choose the next standard length up. For example, clamping 20mm of material into a 40-series profile generally calls for an M8×25mm or M8×30mm bolt. When in doubt, size up — you can always add a washer to take up extra thread.

What T-slot profile series are these M8 T-bolts compatible with?

These M8 square head T-bolts are generally compatible with 40-series (40×40mm) and 45-series aluminum extrusion profiles that have an 8mm slot width. They are not typically suited for 20-series profiles, which use M5 or M6 hardware. Always verify your profile's slot width before ordering — if you're unsure, contact us with your profile brand and series number.

Can these T-bolts be used outdoors or in humid environments?

Yes. A2-304 stainless steel provides solid corrosion resistance for most outdoor, humid, and light marine environments — including greenhouse frames, outdoor workbenches, and covered structures. For continuous saltwater immersion or aggressive chemical exposure, A4-316 stainless steel is generally the better choice.

What is the load capacity or tensile strength of these bolts?

A2-304 stainless steel bolts are typically rated to property class 70, with a minimum tensile strength of approximately 700 MPa (≈101,500 psi). For structural, load-bearing, or high-vibration applications, we recommend consulting an engineer to confirm that M8 hardware meets your specific load requirements.

Do I need a special tool to install these square head T-bolts?

No special tools required. Slide the square head into the T-slot channel from the end of the extrusion or through an access hole, position it where needed, then thread on an M8 nut and tighten with a standard wrench or socket. The square head self-aligns and prevents spinning — no need to hold the bolt head during tightening.

Are these bolts reusable after disassembly?

Yes. Stainless steel T-bolts can generally be removed and reinstalled multiple times without significant thread wear, making them well-suited for modular or reconfigurable aluminum extrusion frame builds where layouts change over time.

What nut should I pair with an M8 T-bolt?

A standard M8 hex nut (DIN 934) or M8 flange nut works for most static assemblies. For vibration-prone setups — such as CNC router frames or equipment subject to motor vibration — an M8 nylon insert lock nut (Nyloc) is typically recommended to prevent loosening over time. All are widely available at hardware stores.

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M8 T-Bolt Square Head Bolt for T-Slot Aluminum Profile — Stainless Steel A2 304

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M8 T-Bolt Square Head Bolt for T-Slot Aluminum Extrusion — Secure, Slide-In Fastening Without Drilling

✅ Key Features of These M8 T-Slot Square Head T-Bolts

📐 Technical Specifications — M8 Square Head T-Bolt for Aluminum Extrusion

❓ Frequently Asked Questions

M8 T-Bolt Square Head Bolt for T-Slot Aluminum Profile — Stainless Steel A2 304

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