How to Install Red Head Multi-set RM Drop-in Anchors
Multi-set is the brand name for the ITW/Red Head drop-in anchor that is designed for use in concrete. The multi-set RM drop-in anchor is a shell type anchor with internal threads made from steel with an expander cone inserted permanently inside the anchor body. The RM style multi-set drop-in anchor has a lip on the threaded end of the anchor to ensure flush and perpendicular embedment into the concrete. Since this drop-in anchor is mostly used with threaded rod for hanging off ceilings, the flush mounting allows for consistent embedment depth and for the threaded rod to be perpendicular with the ceiling.
Multi-set RM Drop-in Anchor
The multi-set drop-in anchor is manufactured from two different types of steel for different rust resistance in different environment applications. The zinc plated carbon steel drop-in anchor has low corrosion resistance and should be used in applications that are indoors or when moisture is not present. The 304 stainless steel RM drop-in anchor provides excellent corrosion resistance and can be used in and around moisture, submerged in salt water and in environments that contain many other chemicals.
Multi-set RM Anchor Diameters
The RM multi-set drop-in anchor comes in five different diameters- 1/4", 3/8", 1/2", 5/8" and 3/4". Each diameter is only available in one length. Unlike many other concrete fasteners, this anchor has only one length for each diameter. The anchor diameter for this anchor refers to the inside diameter or the diameter of the threaded rod or bolt that can be screwed into it. The threads of this anchor are all national coarse threads and extend into the anchor body about 1/3 of the length of the anchor.
Multi-set RM Drill Bit Diameters
The drill bit is used for drilling the hole for a Multi-set RM drop-in anchor should be carbide tipped and used in a hammer type drill and also meet ANSI standard B212-15-1994 specifications. The designated size of the drop-in anchor refers to the inside diameter. The hole must be drilled larger than the designated size of the anchor and it should also be equal to the outside diameter of the anchor. A 1/4" requires a 3/8" hole, the 3/8" requires a 1/2", the 1/2" a 5/8" hole, 5/8" a 7/8" hole and the 3/4" requires a 1" hole.
Multi-set RM Embedment Depth
The RM multi-set drop-in anchor must be embedded into the concrete a minimum depth to provide minimum holding values. The length of the anchor is the minimum embedment that the anchor should be set into the concrete. Each diameter of anchor comes in only one length and the entire length of the anchor must be embedded into the concrete to allow the lip of the RM Multi-set anchor to be flush with the surface of the concrete.
Multi-set RM Drop-in Anchor Installation
1. Drill a hole of the correct diameter into the concrete base material using a hammer type drill and a carbide bit that meets ANSI standards. Make sure that the diameter of the bit being used is the correct diameter for the RM multi-step drop-in anchor being installed.
2. Clean the hole of all dust and debris by using compressed air, vacuum or a wire brush.
3. Use a hammer to tap the RM anchor into the hole until the anchor lip is flush with the surface of the concrete.
4. Insert the setting tool into the anchor. Use a hammer to strike the setting tool until the lip of the setting tool meets the lip of the anchor, which will help ensure that the anchor has been properly expanded.
This type of drop-in anchor should only be used in concrete and are anchors that can be used for hanging applications. It is important to understand how to select the right anchor as well as properly install these Red Head multi-set RM drop-in anchors.
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 basic instruction of how to install Red Head multi-set RM drop-in anchors. Always refer to manufacturer's instructions or consult a contracting expert during any anchoring project.
Article Written By:
Bob Carlisle, President of Concrete Fasteners
Tawny L. Sikon, Operations Manager
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.