The Expanding Rock Anchor is a mechanical fastening system installed into pre-drilled core holes in solid, unweathered rock or extremely dense soil. It expands within the borehole to develop full anchor rod strength, transferring tension from external loads into the rock mass. The expansion mechanism uses a wedge-style system where turning the anchor rod forces resistance wedges outward against rock walls, creating a secure lock through friction and mechanical interlocking.
The anchor rod is hot-dip galvanized steel per American Society for Testing and Materials (ASTM) A123 standards for corrosion protection. Wedges or expansion components are malleable castings with rust-resistant coatings for long-term durability. A triple eye design accommodates up to three guy connections for various anchoring configurations.
Available specifications include rod diameters of 3/4 inch and 1 inch, with lengths from 15 to 96 inches. Tensile strengths reach 36,000 pounds for 1-inch models and 23,000 pounds for 3/4-inch variants. Closed anchor sizes measure approximately 1-3/4 inches for 3/4-inch rods and 2-1/4 inches for 1-inch rods, expanding to 2-3/8 inches and 3-1/8 inches respectively.
Applications include tunnel excavation, mining operations, cavern stabilization, transmission line foundations, communication towers, slope protection, and infrastructure projects requiring robust rock reinforcement for safety and stability.
Reliable Expanding Rock Anchor Supplier Since 2003
RaxPower is a leading manufacturer based in Hebei, China, established in 2003. With over 21 years of experience, we focus on innovation, quality, and safety in producing high-performance support products.
Our Expanding Rock Anchor embodies this commitment, featuring superior characteristics to meet the most demanding roof support applications. It offers high-load bearing capacity and excellent elongation properties, ensuring reliable performance in challenging conditions.
Utilizing advanced hot forging technology from our 17,000 square meter production facilities, each anchor achieves greater strength and precise sizing. The durable galvanized finish, compliant with ISO 1461, provides long-lasting corrosion resistance, while the triple eye design allows secure connections for up to three guy strands.
Manufactured under strict quality control with multi-stage testing and SGS certification, our anchor expands and wedges against rock walls, delivering immediate full load-bearing capacity and easy installation. Ideal for underground tunnelling, mining, and civil engineering projects, it enhances operational stability and safety. Click now to learn more about transforming your operations with RaxPower Expanding Rock Anchors.
| Rod Diameter (in) | Rod Length (in) | Anchor Size Closed (in) | Anchor Size Exposed (in) | Hole Size (in) | Tensile Strength (lb) | Weight (lb) |
|---|---|---|---|---|---|---|
| 3/4 | 15 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 5 |
| 3/4 | 30 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 7 |
| 3/4 | 53 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 10 |
| 3/4 | 60 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 11 |
| 3/4 | 72 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 12 |
| 3/4 | 84 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 13 |
| 3/4 | 96 | 1-3/4 | 2-3/8 | 1-7/8 | 23,000 | 15 |
| 1 | 30 | 2-1/4 | 3-1/8 | 2-3/8 | 36,000 | 14 |
| 1 | 53 | 2-1/4 | 3-1/8 | 2-3/8 | 36,000 | 18 |
| 1 | 72 | 2-1/4 | 3-1/8 | 2-3/8 | 36,000 | 24 |
| 1 | 96 | 2-1/4 | 3-1/8 | 2-3/8 | 36,000 | 29 |
Frequently Asked Questions
RaxPower expanding rock anchors are crafted from durable steel, with the rod hot-dip galvanized per ISO 1461 for corrosion protection. The wedges are made of malleable castings coated with a rust-resistant inhibitor. The anchors are designed to develop full strength in solid rock and comply with specifications for tensile performance and material quality, having passed SGS tests for reliability in grid applications.
RaxPower expanding rock anchors are available in rod diameters of 3/4 inch and 1 inch, with various lengths including 15, 30, 53, 60, 72, 84, and 96 inches. The tensile strength is up to 23,000 pounds for 3/4-inch rods and up to 36,000 pounds for 1-inch rods. Specific models offer closed anchor sizes of 1-3/4 inches or 2-1/4 inches, and expanded sizes of 2-3/8 inches or 3-1/8 inches, with corresponding hole sizes.
Each RaxPower expanding rock anchor features a triple eye design, allowing it to accommodate up to three guy strands for secure connections. The eye grooves are contoured to minimize wear and tear on the strands, enhancing durability and reliability.
Drill a core hole into solid, unweathered rock to the specified diameter (1-7/8 inches for 3/4-inch rod or 2-3/8 to 2-1/2 inches for 1-inch rod) and a minimum depth of 12 inches in line with the guy angle. Clean the hole to remove debris. Insert the anchor and use a bar through the triple eye to turn the rod, which expands the resistance wedges into the rock, migrating the cone into the shell to secure it.
Grouting is not typically required for the mechanical expansion of RaxPower anchors, as they rely on wedge action for immediate support. However, grouting can be performed for additional security by filling the drill hole with cement grout via down-bolting or up-bolting to displace air and water, ensuring full bearing and longevity in challenging conditions.
Yes, we support orders of all sizes with efficient production and warehousing. Our flexible manufacturing system allows for bulk deliveries, and we prioritize on-time delivery through streamlined logistics, making us a reliable partner for EPC contractors and major projects.
Yes, we provide comprehensive OEM/ODM services, including free samples and custom design support. Our engineering team collaborates with you to customize products to your specifications, ensuring consistent quality and cost savings that protect your brand.
We offer competitive wholesale pricing with no minimum order quantity, allowing distributors to order as little as one piece. Our high-volume production and variety of products ensure low costs and good profit margins, supported by reliable supply chains. 
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