These stainless steel masonry screws can be used in applications where stainless steel is required to fasten an item or fixture to masonry base materials, such as an electrical junction box, plywood, light fixture or a 2x4.
There are two different head styles are available: the slotted hex washer head for use in applications where the head of the screws sits on top of the surface of the material being fastened and the Phillips flat countersunk for use in applications where the head sits flush with the surface of the item being fastened.
CreteFlex screws are manufactured in a one-quarter inch (1/4”) diameter, which is designated by the first number in the description.
CreteFlex screws are available in lengths from 1-1/4” to 6”, which is designated by the second number in the description. The hex headed screw is measured from underneath the head; the flat countersunk is measured as an overall length including the head.
A 7/32” diameter hole must be drilled into the base material using a hammer drill and a carbide tipped bit that meets ANSI standards. This will ensure proper tolerance for each diameter of both the hex and flat headed stainless steel CreteFlex screw.
The hole must be drilled into the masonry material a minimum of 1/4” deeper than the screw will penetrate the masonry. It is important that the hole allows the screw to be installed at minimum embedment depth.
Thickness of Material Being Fastened
Each different length of Philips flat head or hex head screw is designed to fasten materials of different thickness. The maximum thickness of material to be fastened can be determined by subtracting the minimum embedment depth of 1” from the length of the screw. For example, subtract 1” from the overall length of a 3-3/4” long CreteFlex screw to determine that 2-3/4” would equal the maximum thickness of the material that can be fastened with this length of the screw.
|2,732 PSI Concrete||Hollow Block (2,070 PSI)|
|Embedment||Pull-Out (Lbs.)||Shear (Lbs.)||Pull-Out (Lbs.)||Shear (Lbs.)|
Each box of CreteFlex screws is packaged 100 pieces per box, with one proper diameter and length bit in each box.
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.