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1/4" Single Expansion Anchor, 100/Box

   Availability: In Stock
  Questions? Email Mike

$36.00 per Box of 100
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Purchase the 1/4" Single Expansion Anchor direct for highest quality and savings. Every CONFAST® 1/4" Single Expansion Anchor ships out freight free.


Customer Reviews

CONFAST® - 1/4" Single Expansion Anchor

The 1/4" Single Expansion Anchor is a one-piece anchor that is packaged with 100 pieces per box. It is a general purpose masonry fastener that works well in brick, block or concrete. An extensive inventory is stocked so that every order is shipped the same day received, with free freight on orders over $25.00.

  • Bit size 1/2"
  • Minimum embedment 1-3/8"
  • Anchor designation is bolt diameter
  • Bolt sold separately
  • National coarse threaded
  • Made from zinc alloy - rust resistant
  • Comes assembled and ready to install
  • Insert threaded cone first into hole
  • Well suited for hard dense material
  • 1/4" refers to the inside or bolt diameter of the anchor
  • Order of $25.00 or more earn free freight
Products specifications
Bit Size 1/2"
Minimum Embedment 1-3/4"
Thread Type 1/4" - 20
2000 PSI Concrete - Pull-Out (lbs.) * 131
Type Female
Diameter 1/4"
Length 1-3/4"
Material Carbon Steel Zinc Plated
Environment Dry
Box Qty 100
Minimum Spacing 5"
Minimum Edge Distance 2-1/2"
Minimum Fixture Hole Diameter (In Place) 9/16"
Minimum Fixture Hole Diameter (Hole Spotted) 1/4"
Inside Anchor Diameter-Bolt Diameter 1/4"
Outside Anchor Diameter 1/2"
Internal Thread Length 5/16"
Length Measurement End to End
Bolt Length Fixture Thickness + Embedment Depth
Brand Name CONFAST®

The 1/4" Single Expansion Anchor is made from Zamac . This anchor is designed for use in concrete, block, and brick.

The anchor is designed for use in an outdoor, moist environment.

Hole Diameter/Bit Diameter
The 1/4" Single Expansion 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 1/4" Single Expansion Anchor is 1/4".

Length Anchor
The length of the anchor is 1-3/8", and is measured as an overall length of the anchor from end to end.

Thread Type
The threads on the 1/4" Single Expansion Anchor are national coarse threads that measures 1/4" with 20 threads per inch, commonly referred to as 1/4"-20.

The anchor is packaged with 100 pieces per box.

Minimum Embedment
The 1/4" Single Expansion Anchor minimum embedment into the concrete is 1-3/8". Therefore, the 1/4" Single Expansion Anchor must be installed so that a minimum of 1-3/8" of the anchor is embedded 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 1/4" Single Expansion 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 1/4" Single Expansion Anchor any closer than 2-1/2" from an unsupported edge of concrete.

Bolt Length
When a bolt is used in conjunction with the anchor , the length of the bolt needed is determined by considering these factors:

  • Flush With Concrete - when the anchor is set flush with the surface of the concrete, add the thickness of the material being fastened to the thread and then add the space for any washers used.
  • Below Surface of Concrete - add the depth below the surface of the concrete to the thickness of the material being fastened, then add the space for the washer, and, finally, add for the thread engagement.

Holding Values - Ultimate Load Values in 2000 PSI Concrete

1/4" Single Expansion Anchor Size

Minimum Embedment

Pull-Out (lbs.)

Shear (lbs.)

1/4" x 1-3/8"




Product Information


Part number

Quantity per Box

1/4" Single Expansion Anchor



Installing a 1/4" Single Expansion Anchor
  1. Drill a 1/2" hole into the concrete using a carbide-tipped bit that meets ANSI Standards B212.15.
  2. 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 .
  3. Clean the hole with a wire brush, vacuum, compressed air, or a blow-out bulb.
  4. Insert the anchor with its threaded end first into the hole.
  5. Place the fixture over the 1/4" Single Expansion Anchor, insert a 1/4" diameter bolt through the fixture and into the 1/4" Single Expansion Anchor.
  6. Use a wrench to turn the anchor clockwise until tight or maximum torque value 5 ft. lbs. is reached.
  7. Always use proper personal protective equipment per manufacturer's and OSHA instructions.

1/4" single expansion anchor - brick - camera 1/4" single expansion anchor - block - skateboarding sign


* The figures above indicate average ultimate tension and shear failure values. A safety factor of 4:1 or 25% of ultimate value is generally accepted as a safe working load. Reference should always be made to applicable codes.

These bits work with the selected anchor
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