A mounting clamp for securing a conduit to a surface is disclosed. The clamp has a strap and a clampback. The clampback has a conduit support on one end portion and a curved section on another end portion. The strap has a first strap portion facing the conduit support and a second strap portion connected to the curved section to allow the first strap portion to bend toward or away from the conduit support. The first strap portion has at least one curved portion with a first radius of curvature to secure a conduit of a first range of sizes, and another curved portion with a second radius of curvature to secure a conduit of a second range of sizes that is partially different from the first range of sizes. The conduit support portion has two sidewalls spaced from each other, each with a curved segment to receive the conduit.