Notes on specifying perforated and expanded sheet
Short, practical notes on the numbers that decide price and service life — written for buyers who would rather compare offers than trust a description.
Reading a perforated metal spec: hole, pitch and open area
Three numbers describe a perforated sheet completely. Once you can turn them into open area, you can price and compare without asking anyone.
Aluminium or steel expanded mesh: which surface for which job
Both are made the same way and behave very differently. The choice comes down to whether the panel has to carry weight or simply hang there.
Step treads: what decides grip, load and how long they last
A tread is a small part with three big decisions in it. Most failures come from the one that was left to the fabricator.
Six numbers to send with a sheet metal inquiry
Most first quotations are wrong because the inquiry was missing one of six numbers. Here they are.