Grade 12.9 Carbon Steel Flange Torx Bolts M5 M6 Hex Screws

Grade 12.9 Carbon Steel Flange Torx Bolts – M5 & M6

Built for demanding applications, these Grade 12.9 Carbon Steel Flange Torx Bolts deliver exceptional tensile strength and reliable fastening performance. Whether you're working on machinery, automotive components, or heavy-duty DIY projects, these high-strength screws offer the durability and precision you need. Available in convenient multipacks of 1, 3, 5, or 10 pieces so you can stock up at the right quantity for your job.

Product Specifications

• Name: Flange Torx Bolts
• Head Shape: Hexagon (External Torx / Plum Head)
• Material: Medium Carbon Steel
• Surface Finish: Black
• Product Strength: Grade 12.9
• Thread Size: M5, M6
• Standard Type: GB
• Pack Options: 1 / 3 / 5 / 10 PCS

Made in Mainland China.

Why Choose These Flange Torx Bolts?

• ✅ High Strength Grade 12.9 – One of the strongest bolt grades available, ideal for heavy-load and high-stress fastening applications.
• ✅ External Torx Head Design – The plum-shaped outer hexagon head allows for a secure, high-torque drive with reduced cam-out risk.
• ✅ Integrated Flange – The built-in washer flange distributes load evenly, reducing surface damage and improving fastening stability.
• ✅ Black Surface Finish – Provides an added layer of corrosion resistance while giving a professional, sleek appearance.
• ✅ Versatile Sizes – Available in M5 and M6 thread sizes to suit a wide range of applications. Contact the seller for other sizes or bulk orders.

Common Applications

• Automotive assembly and repair
• Industrial machinery and equipment
• Heavy-duty DIY and construction projects
• Electronics enclosures and metal fabrication
• General hardware and fastening needs

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Learn more: OSHA guidance on hand and power tools

Frequently Asked Questions

Q: What does Grade 12.9 mean for these carbon steel flange torx bolts?

A: Grade 12.9 is a high-strength bolt classification indicating the bolt has a minimum tensile strength of 1220 MPa. This makes Grade 12.9 carbon steel flange torx bolts among the strongest fasteners available, suitable for critical, high-load industrial and automotive applications.

Q: What is the difference between an external Torx head and a standard hex bolt?

A: An external Torx (plum/star) head bolt features a multi-point star-shaped outer profile that allows a driver or socket to grip from the outside of the head. This design enables higher torque transfer compared to standard hex bolts, reduces slippage, and is commonly used in automotive and precision engineering.

Q: Are other sizes or larger quantities available beyond what is listed?

A: Yes! If you require sizes other than M5 or M6, or need a bulk quantity beyond the listed pack sizes, please contact the seller directly. Custom quotes for bulk purchases are available upon request.

Q: What does the integrated flange on these bolts do?

A: The integrated flange acts as a built-in washer, spreading the clamping load over a wider surface area. This helps prevent surface damage, reduces the need for a separate washer, and improves the overall stability and security of the fastened joint.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.