One of the popular applications for our asphalt anchors is to attach plastic or rubber speed bumps to the roadway. As a rule, we recommend the use of our SP18 anchors for this application, primarily because it uses a 7/16" bolt while the SP10 and SP12 use the smaller 3/8" bolt. The size of the bolt matters due to the sideways (shear) forces that are exerted on the bolt in this application. The smaller bolts are more likely to bend.

The installation requires marking the location of the anchors so that they will line up with the holes in the speed bump. Move the speed bumps and drill 1" holes where the anchors are to be installed. Clean the holes using compressed air or a vacuum cleaner. Fill the holes with our EPX2 grout, then push the SP18 anchors until they are flush with the asphalt. Allow 15 minutes for the grout to cure, then remove the bolts from the anchors, and attach the bumps. Do not exceed the allowed torque (280 lb-in) when tightening the bolts.

Note that you will need to get longer bolts than the 1.25" bolts that are supplied pre-installed in the SP18 anchors. due to the height of the speed bump. The length of the bolt should be calculated so that it will not penetrate more than 2" into the anchor and not less than 0.5". Order a category 5 bolt, 7/16"-14 thread.

We strongly recommend that you apply a thin coating of anti-seize lubricant to the bolt threads before installing the new bolts. This will allow you to tighten the bolts as the rubber bumps get compacted from traffic over time, and to remove the bolts to replace the worn out speed bumps. We apply Permatex aluminum lubricant to all the bolts on our anchors at the factory.