Expansion Anchors

Expansion anchors create internally threaded fastening points in concrete, brick, and block for light- to medium-duty commercial installation and maintenance work. These flush-set, dual-expansion anchors accept machine-threaded bolts, helping teams secure items while retaining the option to remove the bolt for service work.

Product Display:
Helpful Buying Guide

Choose Expansion Anchors for Removable Threaded Fastening

The products represented here are double expansion, internally threaded anchors designed for machine-threaded bolts. Compare the required thread size, the base material, whether flush installation is important, and the pack quantity needed for the job.

Visual Guide

Popular examples in this category

Use Cases

Create removable bolt locations

These anchors provide internally threaded points for machine-threaded bolts. The bolt can be removed when service work is needed.

How to Choose

Match the thread and job quantity

Select the thread size required for the machine-threaded bolt, then compare 25-, 50-, and 100-piece pack quantities for the number of fastening locations.

Applications

Use in masonry base materials

The represented anchors are intended for concrete, brick, and block. Some listed options also identify solid stone as a compatible base material.

Additional Info

Understand the dual-expansion design

When the bolt is installed, the anchor expands against the base material at two points. Certain options are described for base materials of questionable strength.

2Expansion points

Dual-point designs expand against the base material at two points.

4Thread sizes represented

The summaries include 1/4-20, 5/16-18, 3/8-16, and 1/2-13 sizes.

25–100Anchors per pack

Represented package quantities include 25, 50, and 100 anchors.

Light–mediumDuty range

The listed products are described for light- to medium-duty applications.

Comparison Guide

Compare the represented expansion anchor options

Use thread size, stated base-material coverage, and pack quantity to narrow the selection.

Product typeThread size and quantityStated features and base materials
Double expansion anchor1/4-20; 100-packZamac alloy, flush-set, internally threaded; concrete, brick, or block.
Double expansion anchor5/16-18; 100-packZamac alloy, flush-set, internally threaded; concrete, brick, or block.
Double expansion machine screw or bolt anchor3/8-16 or 3/8 in. x 2 in.; 50-packInternally threaded dual expansion; concrete, brick, block, with solid stone stated for the machine bolt option.
Double expansion machine screw anchor1/2-13; 25-packZamac alloy, flush-set, internally threaded; concrete, brick, or block.
Planning Guide

Plan the right fit before choosing

Start with the fastening requirement

Match the anchor to the machine-threaded bolt

Internal threads are a central feature across the represented products. Choose an anchor with the needed thread size before considering pack quantity or other product differences.

  • Thread sizes represented include 1/4-20, 5/16-18, 3/8-16, and 1/2-13.
  • UNC options are also represented.
  • Internal threading supports bolt installation and removal.
Consider the base material

Confirm suitability for the installation surface

These expansion anchors are presented for fastening in concrete, brick, and block. Selected dual-expansion options are also described for solid stone and for base materials of questionable strength.

  • Dual-point expansion occurs as the threaded bolt is installed.
  • Flush-set options sit even with the base material surface after setting.
  • Use the product description to confirm the stated base-material suitability for the option selected.
Plan the quantity needed

Choose a pack size that fits the scope of work

Pack quantities represented range from 25 to 100 anchors, with 50-piece options also available. Comparing package count can help align the purchase with multiple fastening locations.

  • 25-piece packs are represented.
  • 50-piece packs are represented.
  • 100-piece packs are represented.
FAQ

Common questions before buying

What materials are these expansion anchors used in?

The represented products are intended for concrete, brick, and block. Some options also state use in solid stone.

Can the bolt be removed after installation?

Yes. The internally threaded designs are described as allowing machine-threaded bolts to be removed for service work.

How do double expansion anchors work?

They expand against the base material at two points when a machine-threaded bolt is installed.

What pack quantities are available?

The supplied summaries represent 25-, 50-, and 100-piece quantities.