The 1/4" Double Expansion Anchors
are preassembled into a single unit and are packaged with 100 pieces per box. Their expansion for the entire
length provides the optimal opportunity for successful fastening in masonry
material of questionable strength. Whether it is one box or a full pallet, all
orders over $25.00 ship with free freight.
Bit size 1/2"
Minimum embedment 1-3/8"
Bolt diameter is anchor size
Bolt must be purchased separately
Requires a bolt with national coarse threads
Rust resistant Zamac
Ready to install
Threaded cone is inserted first into the hole
Do not use in overhead applications
Do not expand anchor before installation
Free freight on all orders over $25.00
1/4" - 20
2000 PSI Concrete - Pull-Out (lbs.) *
Minimum Edge Distance
Minimum Fixture Hole Diameter (In Place)
Minimum Fixture Hole Diameter (Hole Spotted)
Inside Anchor Diameter-Bolt Diameter
Outside Anchor Diameter
End to End
Fixture Thickness + Embedment Depth
* Values shown are average ultimate values and are offered only as a guide and are not guaranteed. A safety factor of 4:1 or 25% is generally accepted as a safe working load
Applications The anchor is made from Zamac Alloy. This anchor is designed for use in Concrete, Block, and Brick.
Environment The anchor is designed for use in a Moist environment.
Hole Diameter/Bit Diameter The anchor requires a 1/2" hole to be drilled in the base material (Concrete, Block, and Brick). The hole should be drilled with carbide tipped bit that meets ANSI standards and used in a hammer drill.
Designated Size The designated size of the anchor refers to the inside diameter 1/4" of the anchor or the diameter of the threaded rod or bolt that can be inserted into it.
Diameter of Anchor The diameter of the anchor is 1/4".
Length Anchor The length of the anchor is 1-3/8"
Thread Type The threads on the anchor are national coarse threads that measures 1/4" with 20 threads per inch, commonly referred to as 1/4"-20 .
Packaging The anchor is packaged with 100 pieces per box .
Minimum Embedment The minimum anchor embedment into the concrete is 1-3/8". Therefore, the anchor must be installed so that a minimum of 1-3/8" of the anchor is embedded into the concrete.
Depth of Hole The depth of the hole that is required for the anchor should be a minimum of 1/2" deeper than the anchor will penetrate the concrete. This will allow space for dust created during the installation process to fall, which will prevent the anchor from bottoming out in the hole before full penetration into the concrete.
Fixture Hole Diameter The hole in the fixture or material being fastened must be larger than the designated diameter of the anchor. The 1/4" diameter anchor requires the hole in the fixture to be 9/16".
Torque Value The maximum torque that can be applied to the anchor once installed is 5 ft./lbs.
Spacing between Anchors Each anchor must be spaced a minimum distance of 5" from each other when measured center to center.
Edge Distance It is very important not to install the anchor any closer than 2-1/2" from an unsupported edge of the concrete.
Holding Values - Ultimate Load Values in 2000 PSI Concrete
1/4" x 1-3/8"
Installing a 1/4" Double Expansion Anchor
Drill a 1/2" hole into the concrete using a carbide-tipped bit that meets ANSI Standards B212.15.
The depth of the hole can be deeper or equal to the minimum embedment depth of 1-3/8" which is equal to the length of the anchor .
Clean the hole with a wire brush, vacuum, compressed air, or a blow-out bulb.
Insert the anchor with its threaded end first into the hole.
Place the fixture over the 1/4" Double Expansion Anchor, insert a 1/4" diameter bolt through the fixture and into the 1/4" Double Expansion Anchor.
Use a wrench to turn the anchor clockwise until tight or maximum torque value 5 ft. lbs. is reached.
Always use proper personal protective equipment per manufacturer's and OSHA instructions.