Why Is 40 × 40 the Most Widely Used Hollow Section in the Market?

If your warehouse space is limited and you need to keep one hollow section size in stock at all times, the answer for most Iranian markets is one size: 40 × 40. This size is neither so small that it falls short for light structural applications nor so large that it is purchased only for special projects.

Why Exactly 40 × 40

A hollow section, due to its higher moment of inertia compared with many other sections, provides good strength relative to its weight. The 40 × 40 size offers exactly the balance required by the most common applications, from railings and guards to light and medium structures; no more, no less.

High-demand hollow sections such as 40 × 40 are produced by rolling this steel coil into a closed section.

Warehousing Guide Based on This Pattern

The Risk of Incorrect Stocking

Stocking a large volume of a low-demand size, even at a good purchase price, can lock up your capital for a long time because there are fewer actual customers for that size. Conversely, insufficient 40 × 40 inventory during the high-demand construction season means losing a customer who could have finalized their purchase that same day.

This demand distribution is a general market rule; the best approach is to record several months of your actual sales and see which size is genuinely reordered more frequently, rather than relying solely on a general pattern.

Consider Regional Differences as Well

Although 40 × 40 is the most widely used size in most markets across the country, another size may replace it in regions with different construction practices. Before setting a fixed warehouse inventory based on this general pattern, also check your actual sales from the past several months to make sure they match the local market.