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Simpson Split Drive Anchors

Sunday, August 31, 2008
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Purchase Split Drive Anchors

MSD/CSD/DSD Split Drive Anchors

Simpson Strong-Tie Anchor Systems® split drive anchors are a one piece anchor that has a mushroom head (MSD), countersunk head (CSD) or the duplex head (DSD) at one end. The opposite end of the head is split to allow for expansion once the split drive anchor is driven into the base material. The split drive anchor’s expansion mechanism compresses as it is driven into the base material. The compression exerts an outward force creating the holding values.

Simpson Strong-Tie Anchor Systems® Split Drive Anchors

Split drive anchors from Simpson Strong-Tie Anchor Systems® are designated by letters that refer to the head style of the split drive anchor: MSD represents mushroom head split drive, CSD represents countersunk split drive and the DSD represents duplex split drive.

MSD Split Drive Anchors

The MSD head is a low profile wide head to provide a superior bearing surface on the material being fastened. MSD split drive anchors are produced in the one diameter of 1/4” with six different lengths ranging from 1-1/2” to 4”. They are available in a zinc plating.

CSD Split Drive Anchors

The CSD is a flat countersunk head designed mainly for wood applications. The design allows the head of the split drive anchor to be countersunk into the wood and leaves the head flush with the surface of the wood. The CSD split drive anchor is available in only one diameter of 1/4” and is available in six diameters ranging from 1-1/2” long to 4” long. The various lengths come in a zinc plated version and the 3” and 4” are available in both zinc plating and mechanically galvanized.

DSD Split Drive Anchors

The DSD is a double headed split drive that, when set into the base material, can be removed with a claw hammer. It is designed for temporary applications like concrete forming. The sole diameter and length available in the DSD split drive anchor is 1/4” x 3”. The duplex split drive is zinc plated.

Split Drive Anchor Base Material

All of the different head styles split drive anchor should only be used in solid base materials such as concrete, stone, and grout filled block. The expansion of the split drive anchor is focused in one small area the anchor requires a solid base material to achieve holding values.

Hole Size for Split Drive Anchors

The hole to be drilled into the base material equals the diameter of the split drive anchor. All of the split drive anchors are 1/4”; therefore, a 1/4” hole must be drilled for the split drive anchor. The hole size is critical because the tolerance between the anchor and the hole must be very tight in order for the split drive anchor to work properly. To achieve the proper hole size tolerance, it is very important to use a hammer drill with a carbide bit that meets ANSI standards.

Hole Depth

The depth of the hole drilled should be slightly deeper than the split drive anchor will penetrate the base material. This extra space will allow an area for debris created during the installation process to fall into.

Depth of Embedment

The minimum embedment for all the split drive anchors is 1-1/4”. This means that the split drive anchor must penetrate the base material at least 1-1/4” to obtain proper holding values. Trying to embed the CSD and MSD split drive anchor deeper than 1-1/2” into the base material may cause the anchor to bend during the installation process.

Environments

Do not use the split drive anchor in environments that are wet or corrosive. The split drive anchor is a hardened fastener. Studies that have shown that hardened fasteners in these types of environments tend to have performance problems.

Split Drive Anchor Fixture Hole

The inherent design of the split drive anchor requires that the hole in the fixture being fastened be larger than the diameter of the hole drilled in the base material. For the MSD and CSD, a 3/8” hole is required if the fixture is of a harder material such as steel. For the DSD, it is recommended that a minimum of a 5/16” hole is in the fixture to be fastened.

MSD/CSD/DSD Product Information

Item #

Diameter x Length

Box Quantity

Carton Quantity

MSD25112

1/4” x 1-1/2”

100

500

MSD25200

1/4” x 2”

100

500

MSD25212

1/4” x 2-1/2”

100

500

MSD25300

1/4” x 3”

100

400

MSD25312

1/4” x 3-1/2”

100

400

MSD25400

1/4” x 4”

100

400

CSD25112

1/4” x 1-1/2”

100

500

CSD25200

1/4” x 2”

100

500

CSD25212

1/4” x 2-1/2”

100

500

CSD25300

1/4” x 3”

100

400

CSD25312

1/4” x 3-1/2”

100

400

CSD25400

1/4” x 4”

100

400

CSD25300MG

1/4” x 3”

100

400

CSD25400MG

1/4” x 4”

100

400

CSD25300

1/4” x 3”

100

400

Split Drive Anchor – Installation

Loading capacity of the split drive anchor will be reduced if the hole in the base material is oversized. Embedding the MSD or CSD at greater depths than 1-1/2” may cause the split drive anchor to bend during the installation process.

1. With a 1/4” ANSI standard carbide bit, drill a hole in the base material using a hammer drill. The hole must be deep enough so that the split drive anchor will be embedded into the base material a minimum of 1-1/4” and there will be space for any debris to fall during the installation process.

2. With compressed air, clean the hole of all the base material dust. In overhead applications, cleaning out the hole is not necessary.

3. Position the hole in the fixture over the hole in the base material and insert split drive anchor through the fixture hole and into the hole in the base material. Make sure the hole in the fixture is 3/8” in diameter for the MSD and CSD, and 5/16” in diameter for the DSD.

4. With a hammer, drive the split drive anchor until the head of the anchor is flush with the surface of the fixture.

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Always use personal protective equipmentAs with any anchoring project, it is important to keep safety in mind and follow instructions carefully. Always remember to wear safety goggles, handle all tools with extra care and follow all technical specifications. This article is meant to serve only as a basic explanation of concrete fasteners. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.

Article Written By:
Mike Pistorino, Vice-President Operations

 

 

 

 


Concrete Fasteners, Inc. has over 40 years of experience selling concrete fasteners. We can ship out one box or a whole pallet of concrete anchors. Our products are of the highest quality... "your satisfaction is guaranteed". We ship all orders the same day the order is received.

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