Sleeve Bolts

These excellent anchor bolts are very popular, mostly because they are simple to use and relatively inexpensive, their only downsides are : they are difficult to get out again if you have to remove them they are expansion bolts and so may crack weak bricks or concrete, especially near the edges they shouldn’t be used in hollow brick or block walls (although often are) as they need solid surrounding masonry to tighten properly they shouldn’t be used for heavy duty or heavy structural applications (although often are) as they are a medium duty anchor only They get there name from the way they are made, they are based around a centre core bolt, with an expansion cone on the end, surrounded by a full length sleeve. When you tighten the head it pulls the centre bolt up into the sleeve and the cone expands it and provides the grip, the great thing about sleeve anchors is as the sleeve expands it grips up its full length instead of just at the end (as in most concrete anchors) so it spreads the load over a bigger distance making it OK to use in weaker materials such as brick and sandstone (that would shatter with other bolts).