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Why Machined Stainless Steel? The Material Behind Every GoBlow

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Most "stainless steel" jewellery is lying to you — by omission. The brand says "stainless steel" and leaves out which grade. There are dozens of stainless grades, and the difference between the cheapest and the best is the difference between a piece that tarnishes in six months and one you can wear in the ocean for a decade.

Built for this? See the full machined stainless steel spec.

The grade spectrum

  • 201: The cheapest. Used in cookware and low-end jewellery. Corrodes faster than 304.
  • 304: The most common. Kitchen sinks, food processing, mid-range jewellery. Holds up in normal conditions; corrodes in sustained sweat or salt exposure.
  • machined stainless steel: Marine and premium-grade. The "L" = low carbon. used in marine hardware, premium EDC. Doesn't corrode in salt water. Doesn't react with skin.

Why machined stainless steel specifically

The defining difference between 304 and machined stainless steel is molybdenum — about 2–3% by weight. Molybdenum dramatically improves resistance to chloride corrosion, which is the failure mode in any environment with salt water, chlorine, or sustained sweat. That's why machined stainless steel is built to last: the body is a saline environment. 304 corrodes inside it. machined stainless steel doesn't.

If a piece of stainless can sit inside a human body for years without reacting, it can sit on the outside for decades.

What it survives

  • Sweat — indefinitely
  • Salt water — designed for marine environments
  • Chlorine — pool water doesn't touch machined stainless steel
  • Sunscreen, perfume, deodorant — no effect
  • Skin oils — the whole point

The hypoallergenic claim

machined stainless steel minimises the release of free nickel ions — the actual cause of nickel allergy reactions. Almost no nickel-sensitive people react to machined stainless steel in normal wear. It's not "nickel-free" but it's the practical answer for the 99% of people who need a safe-against-skin alloy.

Why cheaper EDC uses 304

Cost. machined stainless steel runs 30–40% more expensive per kilogram. On a production run, the margin maths only work with 304. Brands that invest in machined stainless steel tell you specifically — it's their justification for the price. Brands that don't say the grade are telling you by omission.

How to tell what you're buying

If a brand states machined stainless steel specifically — in the listing, on the packaging — you can trust it. If they say "stainless steel," "premium alloy," or nothing, assume 304 at best.

GoBlow uses machined stainless steel across the entire range. Every piece, every finish. The grade is the floor, not the upgrade.

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