Pipe clamp for fastening a pipe to a channel type profile element having a longitudinal mounting slot having a slot width (w) and being defined by slot edge portions, the pipe clamp including two clamp parts, each clamp part having: - a curved pipe clamping portion, wherein in a mounted state the curved pipe clamping portions of the respective clamp parts are positioned opposite each other to accommodate a pipe section, with the curved pipe clamping portions extending around diametrically opposite surface areas of said pipe section; - an anchoring portion formed at or near a first end of each curved pipe clamping portion to anchor the pipe clamp to the profile element, said anchoring portion essentially being formed as a leg with a hammerhead, said hammerhead having a width that exceeds the slot width (w) and said leg having a smaller width than the slot width (w), the anchoring portion furthermore having a thickness smaller than the slot width (w), whereby the hammerhead is insertable in the longitudinal slot of the profile element and rotatable to engage the slot edge portions; and - a flange formed at a second end of each curved pipe clamping portion, said flanges of the clamp parts being adapted to be positioned opposite each other; the pipe clamp furthermore including a tightening member associated with the clamp flanges for tightening them together, wherein the curved pipe clamping portion has a hammerhead sided half and a flange sided half, and wherein the curved pipe clamping portion has at least one reinforcing rib that extends tangentially over the hammerhead sided half of at least one of the curved pipe clamping portions towards the first end, characterized in that the curved pipe clamping portion has a varying stiffness along the curve length between the first end and the second end of the curved pipe clamping portion, wherein on average the stiffness of the pipe clamping portion decreases from the first end towards the second end, wherein on average the stiffness at the hammerhead sided half is higher than at the flange sided half, and wherein the reinforcing rib has a varying height along said curve length, wherein the rib height increases towards the first end. - a curved pipe clamping portion, wherein in a mounted state the curved pipe clamping portions of the respective clamp parts are positioned opposite each other to accommodate a pipe section, with the curved pipe clamping portions extending around diametrically opposite surface areas of said pipe section; - an anchoring portion formed at or near a first end of each curved pipe clamping portion to anchor the pipe clamp to the profile element, said anchoring portion essentially being formed as a leg with a hammerhead, said hammerhead having a width that exceeds the slot width (w) and said leg having a smaller width than the slot width (w), the anchoring portion furthermore having a thickness smaller than the slot width (w), whereby the hammerhead is insertable in the longitudinal slot of the profile element and rotatable to engage the slot edge portions; and - a flange formed at a second end of each curved pipe clamping portion, said flanges of the clamp parts being adapted to be positioned opposite each other;