Purchase Drop-In Anchors

The coil threaded drop-in anchor (DIAC) brand is a drop-in anchor manufactured and sold by Simpson Strong-Tie Anchor Systems that has internal coil threads instead of the national coarse threads in the standard drop-in anchor. Coil threads are large threads that provide quick threading and are most often found used in concrete forms for bridge construction. Concrete Fasteners, like most companies that sell standard drop-in anchors, has available a coil threaded version of the drop-in anchor. The coil threaded drop-in anchor is designed for use in solid concrete only.

Material Specifications

The coil threaded drop-in anchor is not manufactured from any type of stainless steel other than the standard zinc plated carbon steel. The steel that is used for the body of the coil threaded drop-in anchor has a minimum tensile strength of 70,000 psi and the expansion plug has a minimum tensile strength of 50,000 psi.

Coil Threaded Drop-In Anchor Criteria for Testing

Coil threaded drop-in anchors have been tested in accordance with the ICC-ES’s criteria for expansion anchors, for tension and shear loads in wind loading and seismic, minimum spacing, edge distance as well as combination loads.

Codes and Approvals

The coil threaded drop-in anchors meet the following codes or have approvals:
City of Los Angles RR24682
U.L. # Ex3605
Factory Mutual 3017082
Coil threaded drop-in anchors meet Federal Specifications A-A-55614, Type 1.

Available Diameters

The coil threaded drop-in anchor come in only two diameters of 1/2” and 3/4”. They are designed to accept either 1/2” or 3/4” coil threaded rod or bolts.

Available Lengths

Each diameter of coil threaded drop-in anchor comes in one length. The length of the anchor is standard and the same as the standard and lipped drop-in anchors. The length of the anchor is equal to the minimum embedment that the coil-threaded anchor should be placed in the concrete. The 1/2” coil threaded drop-in anchor is 2” long and the 3/4” coil threaded drop-in anchor is 3-1/8” long.

Coil Threaded Drop-In anchor Threads

The internal threads of the coil threaded drop-in anchor are large compared to the standard national coarse threads in the standard drop-in anchor. The 1/2” coil threaded drop-in anchor has 6 threads per inch and the 3/4” coil threaded drop-in anchor has 5 threads per inch. The internal threads of the anchor determine the designated diameter of the coil threaded drop-in anchor.

Diameter of Hole

The size of the hole to be drilled into the concrete is equal to the outside diameter of the coil threaded drop-in anchor. Since the designated size of the coil drop-in anchor is equal to the inside diameter coil threads, the outside diameter is larger than the designated diameter. The 1/2” coil threaded drop-in anchor’s outside diameter is 5/8” and the 3/4” coil threaded drop-in anchor’s outside diameter is 1”.

Minimum Embedment Depth

The minimum embedment in the concrete for the coil threaded drop-in anchor is equal to the anchor length of the coil threaded drop-in anchor being installed. The minimum embedment is equal to the anchor length. Each coil threaded drop-in anchor must be placed in the concrete so that the open threaded end is flush with the surface of the concrete. Both diameters of anchors can be embedded deeper if needed.

Setting Tool

The coil threaded drop-in anchor is an internally set type of concrete anchor that requires a setting tool to be used to expand the anchor. Each diameter of coil threaded drop-in anchor has a specific setting tool that must be used to ensure the anchor is properly expanded and set in the concrete. The 1/2” coil threaded drop-in uses the 1/2” setting tool and the 3/4” coil threaded drop-in uses the 3/4” setting tool. The setting tools used for the coil threaded rod drop-in anchors are the same tool used for setting the standard and lipped drop-in anchors of the same diameter.

Coil Threaded Drop-In Anchor Installation

1. A hammer drill must be used to drill the hole in the concrete for the coil threaded drop-in anchor. Using the correct diameter carbide tipped drill bit that meets ANSI standards, drill the hole into the concrete 1/8” deeper than the coil threaded drop-in anchor will be embedded. Make sure that the hole is not oversized because an oversized hole will make it difficult to set the coil threaded drop-in anchor and will reduce the holding values.

2. Compressed air can be used to clean the hole of all debris and concrete dust.

3. Insert coil threaded drop-in anchor into the hole in the concrete until the open end of the anchor is flush with the surface.

4. Place setting tool into the open internally threaded part of the coil drop-in anchor. Using a hammer, hit the end of the setting tool until the lip of the anchor meets the lip of the setting tool to ensure that the coil threaded drop-in anchor is fully expanded.

 

Coil Threaded Drop-in Anchor Product Information

Coil Drop-in Part Number	Internal Diameter Of Anchor	Drill Bit Diameter	Length Of Anchor Body	Quantity  Per Box
DIA50C	1/2”	5/8”	2”	50
DIA75C	3/4”	1”	3-1/8”	20

 

Purchase Drop-In Anchors