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Higher Loads Closer to the Edge with Internally Threaded Anchors

Last Updated: 19/8/20 at 1:25pm

Author: Jamie Hunt

Stainless Fischer Internal Threaded Anchor

Our new internally threaded anchors (in 316 stainless) allow you to work with relatively higher loading at closer proximity to the concrete’s edge, compared with traditional sleeve anchors. For example, at a distance of 50mm from the edge of C20/25 concrete, the internal threaded anchor with an M10 thread (glued in with vinylester) will achieve 8.29kN tensile resistance, versus 3.57kN for a 12mm sleeve anchor with an M10 thread.

This is achieved through a range of factors including:

  • The anchor is glued in with chemical anchor providing significant holding power;
  • There is more surface area contact between the fastener, the glue, and the cavity;
  • They are not an expanding anchor, meaning there is no additional pressure applied to the side wall of the cavity, removing the risk of ‘concrete blow-out’.

Recently an Australian customer, Dave Bowen of Grate Engineering, used our internal thread anchors to fasten Stay Grate plates.  These plates are currently being used in wastewater treatment plants to fix drainage grates in place. Dave used the internally threaded anchors because they were expansion free, meaning he could get closer to the edge. Also because they provided an embedded internal thread, meaning the plates could be easily removed. Finally, because they were stainless steel and would therefore hold-up better to the corrosive environment.

Stainless Steel Internal Threaded Anchor Performance Data Fischer Anchoring Systems
Fischer Internal Threaded Anchor Performance Data Other Fischer Anchoring Systems

About Jamie Hunt

Jamie Hunt is the CEO of Anzor Fasteners LLP, with 23 years in procurement and supply of Stainless Steel Fasteners and Hardware under his belt. He also has Olympic yachting experience and is a Certified ISSF Stainless Specialist.

Jamie is a member of the Australian Stainless Steel Development Association and has written many articles including "The Stainless Steel Guide", "Can you paint stainless steel?" and "Are stainless fasteners OK with treated timber?". Check out Jamie on his LinkedIn profile for more information.

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