A crimped tip is made by squeezing the top of a hollow spear shaft flat in a press, then welding the slit closed. The result is a four-sided pyramid roughly 50 mm tall integral with the shaft. No separate cast or fabricated tip is needed, which is why crimped tips dominate the contractor security-palisade market: the cost per spear drops by 60 to 70 percent compared to a cast arrowhead.
The press die has to match the shaft size. A 25x25 SHS crimps cleanly in a workshop hydraulic press with a 40-tonne forming die. Smaller 16x16 or 20x20 shafts crimp at lower force but produce a thinner, sharper pyramid. Round bar can be crimped but the result is asymmetric and visually inferior to the square-section version, which is why round bar palisade almost always pairs with a cast arrowhead instead.
Crimped tips read as straightforward and industrial from the street. They're the right choice for school perimeters, council yards, substations, and commercial frontages where the priority is hard-to-climb deterrence without heritage character. For residential street fronts, cast arrowheads are usually worth the extra cost. CAD60's spear-top models let the fabricator switch between crimped and arrowhead per drawing without touching any other dimension.