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Hammer Anchors

Thursday, September 30, 2010
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Hammer anchors are anchors that are set by using a hammer to expand them or to insert them into a predrilled hole in the base material of concrete, brick or block. Most hammer anchors are for use in solid concrete and cannot be used in brick or block. Hammer anchors range in size from 1/4” diameter up to 3/4”, and can be used in light duty or heave duty applications. All hammer drive anchors are male type and come in zinc plated carbon steel, stainless steel or zamac material.

Hammer Drive Anchors

The hammer drive anchor is an anchor that is designed for light duty fastening and can be used in concrete, brick or block. Hammer drive anchors are made from two-pieces consisting of the anchor body and the expansion nail. They are pre-assembled when packaged. Hammer drive anchors work by driving the expansion nail into the body of the anchor, expanding the anchor body against the wall of the hole in the base material. Different companies refer to the hammer drive anchor using different names, such as hammer screw anchor, metal hit anchor, and zamac anchors. The hammer drive anchor comes in two diameters of 3/16” and 1/4” and in lengths ranging from 3/4” up to 3”. The length of hammer drive anchor to use in any specific application is determined by adding the thickness of the material being fastened plus the minimum embedment depth of the anchor length being used, which ranges from 5/8” to 1-1/4”. The hole in the fixture must be slightly larger than the diameter of the hammer drive anchor being used. A 1/4” hole must be in the fixture for the 3/16” hammer drives anchor and a 5/16” hole in the fixture for a 1/4” hammer drive anchor.

Hammer Drive Technical Information

Hammer Drive Purchase Information

Installing A Hammer Drive Anchor

1. Drill hole in the base material using a hammer drill and a carbide drill bit that meets ANSI standards. The diameter of the hammer anchor being used is equal to the diameter of the carbide drill bit to be used. Make sure that the depth of the hole is deeper than the hammer drive anchor will penetrate.
2. With a wire brush, compressed air and vacuum, clean the hole of all debris and dust.
3. Align the hole in the fixture over the hole drilled in the base material.
4. Insert hammer drive anchor through hole in fixture and into hole in the base material.
5. Make sure that the head of the hammer drive anchor is tight against the fixture, and then strike the nail with a hammer until the expansion nail is flush with the head of the hammer drive anchor.

Strike Anchors

Strike anchors are designed for use in solid concrete only, are expanded with an expansion nail and have threads with a nut and washer. Each strike anchor comes packaged with the anchor body and expansion nail and with the correct size and number of nuts and washers. The strike anchor is manufactured from carbon steel that is yellow zinc coated for rust resistance. Strike anchors can be used for applications ranging from light to heavy duty due to the availability of the diameters which range from 1/4” to 3/4”and in lengths from 1-3/4’ to 6-1/4”. The hole to be drilled in the concrete for the strike anchor is equal to the diameter of strike anchor being installed. The length of the strike anchor to be used is determined by adding the thickness of the material being fastened to the minimum embedment of the diameter of anchor being used; this will give the minimum length of anchor to use. If the strike anchor will be inserted through the fixture during installation then the hole in the fixture must be larger than the diameter of the strike anchor being used.

Strike Anchor Technical Information

Strike Anchor Purchase Information

Installing Strike Anchors

1. Drill a hole in the concrete using a hammer drill and carbide tipped drill bit that meets ANSI standards. Strike anchors require the hole to be equal to the diameter of strike anchor being installed. Make sure that the hole in the concrete is deeper than the strike anchor will penetrate.
2. Clean hole with a compressed air, vacuum and wire brush.
3. Thread nut on to the very end of strike anchor to protect threads while tapping anchor through the hole in the fixture and into hole in the concrete.
4. Once strike anchor is seated in the hole, strike the expansion nail until the head of the expansion nail meets the anchor body.

Split Drive Hammer Anchor

The split drive hammer anchor is designed for use in solid concrete, comes in one diameter of 1/4” and in different lengths ranging from 1-1/2” to 4”. The split drive anchor comes with two head styles of a round head and a flat counter sunk head. Split drive hammer anchors are made from carbon steel and are zinc plated. The diameter of the hole to be drilled in the concrete is 1/4”, the same diameter as the diameter of the split drive hammer anchor. The minimum length of split drive anchor to use for any particular application can be calculated by adding the thickness of the material being fastened to the minimum embedment of 1-1/8”. With all concrete expansion anchors, the hole in the fixture must be larger than the designated diameter of the anchor being used. In the case of the split drive hammer anchor, the hole diameter in the fixture must be a minimum of 5/16”.

Split Drive Technical Information

Split Drive Anchor Purchase Information

Installing Split Drive Hammer Anchors

1. Using carbide tipped bit that meets ANSI standards and a hammer drill, drill a hole in the concrete, making sure that the hole is deeper into the concrete than the split drive hammer anchor will penetrate.
2. Clean the hole of all debris and dust, using a wire brush, compressed air and a vacuum.
3. Insert split drive hammer anchor through the hole in the fixture and into the hole drilled in the concrete.
4. Using a hammer, strike the head of the split drive hammer anchor until the head is tight against the surface of the material being fastened.

 

 

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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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