Industrial Anchors & Blind Rivets

As a working rule, minimum embedment is 4.5 to 5 times the anchor diameter, and edge distance should be at least 6 times the diameter. An M12 anchor therefore wants roughly 55–60 mm of embedment and 70 mm+ from any free edge. Always confirm against the load case and the concrete grade.

A wedge anchor is a through-fixing — you drill through the fixture and the concrete together, then tighten the nut to expand the clip. A drop-in anchor is set flush into the concrete first and takes a separate bolt or threaded rod afterwards, so the fixture can be removed and refitted without disturbing the anchor. Drop-ins are the standard choice for overhead services.

Add up the total thickness of all the sheets being joined and pick a rivet whose stated grip range brackets that figure. Too short and the mandrel will not form a proper head on the blind side; too long and the joint stays loose. Hole diameter should be 0.1–0.2 mm over the rivet body diameter.

Not expansion anchors — they need solid substrate. For hollow block, aerated concrete and perforated brick, use nylon frame fixings, which spread load along the sleeve instead of relying on point expansion. We stock these in 8 mm and 10 mm diameters in a range of lengths.