The Double Expansion Anchor is an internally threaded anchor for medium duty applications in masonry materials such as concrete, brick, and stone. It employs a dual expansion mechanism that ensures full expansion and high gripping power, making it effective in environments where shear loads, side pressure, or vibration are present. The anchor eliminates high stress points, beneficial for fastening into materials of varying or questionable strength.
Constructed from corrosion resistant Zamac Alloy, the anchor provides resistance to environmental factors. The internally threaded design allows for simple installation and removal, facilitating easy service work and enhancing reliability in diverse conditions. Available in sizes ranging from 1/4 inch to 3/4 inch in diameter, the anchor requires specific drill hole sizes for installation, such as 1/2 inch for a 1/4 inch anchor.
Common applications include wall mounted fixtures, railings, and cameras in solid concrete, hollow concrete masonry, brick masonry, and stone. The anchor handles shear loads and vibrations effectively, though it is not recommended for overhead attachments. Job site tests are advised for base materials of inconsistent strength to ensure optimal performance.
The Double Expansion Anchor has been tested in accordance with American Society for Testing and Materials (ASTM) E488 standards and meets Federal General Services Administration (GSA) Specification requirements. Ultimate load testing has been conducted in concrete with a minimum strength of 3,500 psi, evaluating pullout and shear forces to validate performance and compliance with industry benchmarks.
Double Expansion Anchor Supplier for Superior Strength
RaxPower is China’s leading manufacturer of pole line hardware with over 21 years of experience, specializing in drilling and cutting products. Our Double Expansion Anchor is particularly suited for materials of questionable strength, such as stone, and can be used in solid concrete, block, brick, and stone.
With over 17,000 square meters of production facilities and a team of over 170 employees, including professional technicians, we utilize advanced hot forging technology to ensure our anchors deliver greater strength and precise sizing for reliable performance in demanding applications.
We stand behind our products and specialize in providing quality drilling and cutting tools at a fair and reasonable price with strong customer support.
| Anchor Size (in) | Drill Hole Size (in) | Overall Length (in) | Minimum Embedment Depth (in) | Max. Fixture Thickness (in) | Thread Type | Material | Std. Box Qty | Std. Carton Qty | Weight per 100 (lb) |
|---|---|---|---|---|---|---|---|---|---|
| 1/4 | 1/2 | 1 3/8 | 1 1/4 | 1/8 | UNC | Zamac Alloy | 50 | 500 | 4 |
| 5/16 | 5/8 | 1 5/8 | 1 1/2 | 1/8 | UNC | Zamac Alloy | 50 | 500 | 7.5 |
| 3/8 | 3/4 | 2 | 1 3/4 | 1/4 | UNC | Zamac Alloy | 50 | 250 | 12.5 |
| 1/2 | 7/8 | 2 1/2 | 2 1/4 | 1/2 | UNC | Zamac Alloy | 25 | 250 | 18 |
| 5/8 | 1 | 2 3/4 | 2 1/2 | 3/4 | UNC | Zamac Alloy | 25 | 100 | 25.5 |
| 3/4 | 1 1/4 | 3 15/16 | 3 1/2 | 1 1/4 | UNC | Zamac Alloy | 10 | 50 | 54.5 |
Frequently Asked Questions
What are double expansion anchors and what are they used for?
Double expansion anchors are fastening devices used for medium duty applications in rock, concrete, brick, and stone. They are ideal for applications involving shear loads, side pressure, or vibration, and perform reliably in base materials of varying or questionable strength. Common applications include railings, telecommunications installations, grid maintenance, and railway electrification.
What are the key benefits of double expansion anchors?
Key benefits include high gripping power, elimination of high stress points, performance in base materials of varying strength, corrosion resistant Zamac Alloy body for durability in harsh environments, and internally threaded design for simple installation, easy removability, and service work.
How do you install a double expansion anchor?
Drill a hole of the recommended diameter to the depth of the shield, insert the shield in the hole and tap with a hammer for proper positioning, place equipment over the shield, insert the machine bolt through the equipment into the shield and tighten. Job site tests are recommended when used in base materials of questionable strength or consistency.
What sizes are available for double expansion anchors?
Available sizes include 1/4, 5/16, 3/8, 1/2, 5/8, and 3/4 diameters, with corresponding drill sizes, overall lengths, and minimum hole depths. For example, a 1/4 anchor has a drill size of 1/2 and an overall length of 1 3/8.
How are your double expansion anchors tested and certified for critical applications?
Our anchors are tested in accordance with ASTM E488 and meet GSA specification requirements. RaxPower employs strict quality control, including load testing and gauge tests per IEC 120 standards, ensuring compliance and reliability for utility and railway projects requiring utmost dependability.
How do you ensure consistent quality and cost-effectiveness for OEM and distributor partners?
Our anchors are manufactured with rigorous quality checks, including raw material selection and multi-stage testing. RaxPower's advanced processes, like hot forging and automated machines, ensure uniform sizing and consistent quality, providing cost savings through efficient production. We offer bulk packaging options, maintain significant inventory, and ensure on-time delivery with in-stock items shipped promptly to meet project deadlines.
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