The Stainless Steel T-Bolt (also known as a “Hammer Head Bolt” or “T-Slot Bolt”) is the specialized fastener designed for rapid assembly of modular structures. Unlike standard hex bolts, the Stainless Steel T-Bolt features a rectangular head stamped with “A2-70”, allowing it to be inserted directly into the groove of an aluminum extrusion channel at any point, then locked into place with a simple 90-degree turn.
Product Overview: Manufactured from premium Stainless Steel A2 (304), our T-Bolts are engineered for outdoor longevity. They are the industry standard for Solar Photovoltaic (PV) Mounting Systems, allowing solar panels to be clamped securely to roof rails without the risk of rust compromising the structural integrity over decades of exposure.
Stainless Steel T-Bolt Specifications
| Product Name | T-Bolt / Hammer Head Bolt / T-Slot Screw |
| Material Grade | Stainless Steel A2 (304) |
| Strength Class | A2-70 (Tensile Strength: 700 N/mm²) |
| Head Dimensions | 10x20mm, 10x25mm (Customizable for 30/40 Series Profiles) |
| Application | Solar Racking & Aluminum Framing |
Engineering Insight: What does “A2-70” mean?
The marking A2-70 visible on our bolt head is a guarantee of quality:
- A2: Refers to the alloy group (Austenitic 304 Stainless Steel), providing excellent corrosion resistance in atmospheric conditions.
- 70: Refers to the tensile strength property class. “70” means the bolt has been cold-worked to achieve a minimum tensile strength of 700 MPa. This makes it significantly stronger than standard annealed stainless steel (Class 50), ensuring your solar array stays put during high winds.
For more details on fastener markings, please refer to the Stainless steel fastener entry on Wikipedia.
Installation Guide
- Insert: Align the hammer head parallel to the slot of the aluminum profile. Drop the Stainless Steel T-Bolt into the groove.
- Rotate: Turn the bolt 90 degrees so the head engages with the lips of the profile channel.
- Fasten: Install a Flange Nut onto the stud. The tightening action pulls the bolt head up against the profile, locking it in position.
Frequently Asked Questions (FAQ)
Q: Will this fit my 4040 profile?
A: It depends on the head size. Standard M8 T-bolts typically fit 3030 and 4040 series profiles. Please measure your slot opening width (usually 8mm or 10mm) and check against our datasheet.
Q: Is A2-70 strong enough for load bearing?
A: Yes. A2-70 is the standard structural grade for stainless fasteners. It combines ductility with high strength, making it ideal for dynamic loads found in machinery frames.
Need Solar Fasteners?
Handan Bolt manufactures millions of Stainless Steel T-Bolts annually. We can customize the head dimensions to fit proprietary solar rails.
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