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 style 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
|
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.
As 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:
Bob Carlisle, President of Concrete Fasteners
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.