Premier Self-Drilling Anchor Bolt Supplier

Pioneer & Innovator in SDA Manufacturing

Founded in 1991, Onton Bolt is one of the leading local manufacturers of Self-Drilling Anchor (SDA) hollow bars in China.

After Atlas Copco introduced Self-Drilling Anchor Bolts to China in the 1990s, Onton emerged as a key innovator. Over 30+ years, we’ve developed advanced rolling technology that has transformed the threaded hollow bar market—delivering stronger, more competitive products.

As a certified manufacturer under ISO 9001:2015, we specialize in self-drilling anchor rods, nonstandard construction threaded hollow bars, and complete anchoring systems. Our commitment to excellence ensures every solution meets international standards including ASTM A615, EN14199, and EN10080.

30+ Years of Industry Leadership
Advanced Rolling & Heat Treatment Processes
OEM Customization & Non-Standard Solutions
Safety-Focused Design with High Ductility

Unmatched Expertise in SDA Technology

We combine innovation, strength, and safety in every anchor system we produce.

Safety First

ONTON IBO hollow bars absorb more fracture energy than standard bars, ensuring superior performance under stress.

Advanced Process Flow

Our rolling, forging, and heat treatment processes release metal crystal energy—improving strength and reducing costs.

Highly Customizable

We offer non-standard hollow bar manufacturing and specialize in OEM orders tailored to your project needs.

Our Product Range

Engineered for performance, precision, and durability in demanding environments.

Rope Thread Self Drilling Hollow Bar

Designed per ISO 10208 (R25, R32, R38) and ISO 1720 (R51), with left-handed thread for fast installation in complex underground works.

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T-Thread Self Drilling Hollow Bar

Manufactured to T International Standard (T30, T40, T52, T73, T76, T103). High strength ideal for deep foundations and tunneling.

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HDG Self Drilling Anchor Bar

Hot-dip galvanized for enhanced corrosion resistance. Ideal for long-term structural anchoring in aggressive environments.

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Stainless Steel Self Drilling Anchor

Corrosion-resistant stainless steel variants including IBO SDA. Perfect for marine, chemical, and high-moisture applications.

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Build-in-Resin Prestressed Hollow Bolt

Patented 2023 innovation. An improved version of traditional self-drilling anchor bars with integrated resin and prestressing.

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R&T Thread Self Drilling Anchor Bar

Combines rope and T-thread technologies for versatility in connection and rig compatibility.

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Rope Thread Anchor Accessories

Complete system components: coupling, nut, drill bit, plate, centralizer. Designed for seamless integration.

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T Thread Anchor Accessories

Precision-engineered accessories compatible with T-thread systems. Ensures secure anchoring and long-term stability.

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Why Choose Onton Bolt?

We go beyond manufacturing—we deliver engineered confidence.

ISO 9001:2015 Certified

Quality assured at every stage of production and service delivery.

Global Reach

Trusted by clients across continents, from Turkey to Southeast Asia.

OEM & Custom Orders

Specialize in non-standard sizes and configurations for unique projects.

Efficient Packaging & Transport

Robust packaging and global logistics support for timely delivery.

Frequently Asked Questions

Get answers to common inquiries about our products and services.

What is a self-drilling anchor bolt?

A self-drilling anchor bolt (or SDA) is a hollow bar that drills and anchors simultaneously, eliminating the need for pre-drilling. It’s widely used in slope stabilization, tunneling, and foundation work.

Are your products compliant with international standards?

Yes. Our products are qualified in accordance with ASTM A615, EN14199, and EN10080, ensuring global compatibility and safety.

Can you manufacture custom-sized anchor bars?

Absolutely. We specialize in non-standard hollow bar manufacturing and accept OEM orders with customized lengths, threads, and materials.

What materials do you offer?

We offer carbon steel, hot-dip galvanized (HDG), and stainless steel variants to suit different environmental and structural requirements.

How do I request a quote?

Visit our official website or contact our sales team directly via phone or email for a prompt quotation.

Contact Onton for Expert Guidance

Reach out to our team for product inquiries, technical support, or custom solutions.

Get in Touch

Tel/WhatsApp: 86 182 1550 0247 (Abby)

Tel/WhatsApp: 86 151 9803 9705 (Lillian)

Tel: 86 28 87678353

Email: [email protected]

Address: Changlin Street No. 169, Tangchang Town, Pidu District, Chengdu, 611732 Sichuan, China

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