316 (A4) contains molybdenum (typically 2–3%), which 304 (A2) lacks. This addition significantly improves resistance to chloride-induced pitting and crevice corrosion, making 316 the preferred choice for marine, coastal, and chemical-exposure applications. For purely indoor or low-humidity environments, 304 is often sufficient and lower cost; for anything exposed to salt water, pool chemicals, or industrial acids, 316 is the correct selection.

Thickness governs bending stiffness and load capacity in the bar's narrow axis; width governs capacity in the flat axis. For light brackets and decorative infill, 3–5mm thick bars in narrower widths (10–25mm) are typically adequate. For structural tie plates, handrail posts, or load-bearing gussets, 6–15mm thickness with widths of 30–80mm provides the section modulus needed. If you are unsure, consult a structural engineer for load-critical applications.

Yes, with the correct consumables. Use 316L (low-carbon) filler wire or electrodes to minimise carbide precipitation at the weld heat-affected zone. After welding, passivation or pickling of the weld area is recommended for maximum corrosion resistance, especially in marine environments. Avoid using carbon steel tools or wire brushes on the weld area, as embedded iron particles can cause surface rust.

316 stainless steel is highly resistant to rust in most outdoor environments, including coastal and marine settings. However, no stainless steel is completely immune — prolonged contact with standing salt water, industrial chlorides, or strong acids can eventually cause surface staining or pitting if the bar is not periodically cleaned. Regular rinsing with fresh water and occasional passivation treatment will maintain appearance and performance over the long term.

Yes. 316 stainless steel can be cut with an angle grinder fitted with a stainless-rated cutting disc, or with a metal-cutting bandsaw or hacksaw. For drilling, use sharp HSS-Co (cobalt) or carbide-tipped drill bits, apply cutting fluid, and use a slow speed with firm pressure to avoid work-hardening the surface. Avoid using tools previously used on mild steel without cleaning, to prevent cross-contamination.

500mm is the nominal cut length. Standard manufacturing tolerances for cut flat bar are typically ±1–2mm. If your application requires a tighter tolerance, we recommend ordering slightly longer and trimming to final dimension on-site, or contact us to confirm current tolerance specifications before ordering.

The 1-piece option suits single-repair or prototype jobs where you need to verify fit before committing to more stock. The 3-piece pack is practical for small fabrication runs — for example, three identical brackets or three infill bars for a gate panel. The 5-piece pack offers the best per-piece value and is suited to projects requiring multiple identical components or where having spare stock on hand avoids a second order delay.