Confast Drop-In Anchors Now Available for Suspending Electrical Cable Trays, HVAC Ductwork and Fire Sprinkler Pipe, Heads and More

By: CONFAST Concrete Fasteners
Confast Drop In Anchor
Confast Drop In Anchor
CLEVELAND - Aug. 11, 2022 - PRLog -- Uses
  • Drop-In anchors should only be used in solid concrete.
  • Their main use is to insert threaded rod to suspend electrical cable trays, HVAC ductwork and fire sprinkler pipe and heads.
  • They can be used in applications that require a flush mounted anchor and when a bolt needs to be inserted and removed.
  • A setting tool is required to set the anchor in the concrete.

Technical Specifications:

There are numerous technical specifications that must be considered when using Concrete Drop-in Anchors. Considerations include diameter and material type, internal thread length, minimum edge distance and required hole size.

The Concrete Drop-in Anchor is a great fastener option when working with flush mounting applications. The size of the Drop-in Anchor refers to the diameter of the standard UNC threaded rod or bolt to be used with this fastener. Once all these factors have been determined, you can find the expected holding values in the technical information on our website


When setting the anchor flush with the base material: To determine the minimum bolt length required, add the internal thread length of the anchor, plus the thickness of the material to be fastened, plus the thickness of any washer to be used.

When setting the anchor deeper into the concrete:

Determine the minimum bolt length above and add the additional depth to the minimum anchor length.


The forces on a Drop-in Anchor are transferred to the material in which it is installed. If the anchors are installed to close together, it can cause an interaction of the forces, thus reducing their holding power. Minimum anchor spacing and minimum edge distances for the drop-in anchor are as follows:

Technical Information: Ultimate Load Values in 2000 PSI Concrete (on website)

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.  Reference should be made to applicable codes for the specific working ratio.   Minimum embedment for satisfactory anchor performance is 4-1/2 bolt diameters.  Deeper embedments will yield higher tension and shear capacity.

  • As with all female type anchors, the designated diameter of the Drop-In anchor refers to the side diameter of the anchor.
  • The outside diameter of the anchor is equal to the hole diameter required to be drilled in the concrete.
  • Minimum embedment for each diameter of Drop-In anchor is the length of the anchor.
  • The Drop-In Anchor requires the bottom of the hole to set the anchor.
  • First, drop the anchor in the hole with the threaded open end up towards the surface, then insert proper setting tool and hit with a hammer until the Drop-In anchor is fully set.

  • The holding values of the Drop-In anchor are mainly dependent on the psi of the concrete and on the depth of embedment. Other factors include if steel rebar is in the concrete and on the full expansion of the Drop-In anchor.
  • The Drop-In anchor has sides that are smooth to allow for more surface area to be in contact with the concrete, thereby providing consistent holding values.

  • Drop-In anchor are manufactured in five diameters, each diameter has one length.
  • The Drop-In anchor is not manufactured in diameters of 7/8" or 1".
  • Every size of the Drop-In anchor is available in standard zinc plating, 304 stainless steel and 316 stainless steel.
  • No diameter of the Drop-In anchor comes in a galvanized carbon steel.

Email:*** Email Verified
Tags:Concrete Fasteners
Location:Cleveland - Ohio - United States
Account Email Address Verified     Account Phone Number Verified     Disclaimer     Report Abuse

Like PRLog?
Click to Share