Sign letters factory since 2007
Knowledge

304 or 316 stainless for sign letters?

The grade decision is really a site decision. Here is how to make it without guessing.

  1. Home
  2. Knowledge
  3. 304 or 316 stainless for sign letters?

Both grades are 'stainless'. Only one is marine.

Our fabricated stainless builds are specified as genuine 304 or 316 stainless steel. Both resist ordinary weather. The difference shows up where chloride is in the air: coastal sites, roadside signs that get salted in winter, swimming pool halls, and heavily polluted urban locations.

When 304 is the right call

Inland, indoors, and on most urban façades away from the coast, 304 does the job and costs less. It brushes, polishes and plates identically to 316, so the finished look is the same.

When to insist on 316

  • Within sight of salt water, including estuaries
  • Anywhere the letter is washed by road spray in a gritting region
  • Pool halls, spas and other high-chloride interiors
  • Any sign a client expects to look new in ten years without maintenance

What goes wrong when the grade is left unstated

A letter described only as 'stainless steel' is a letter whose grade nobody has committed to. The failure mode is not dramatic — it is a faint brown weep from the fixing points after the first winter, and it is almost impossible to fix in place. Ask for the grade in writing on the quotation.

Ordering

Tell us the site as well as the artwork. If the sign is going up within sight of the sea, say so, and the quotation will come back in 316.

Brushed Stainless Steel Letters 07 manufactured by Super Sign, Shenzhen

Pictured: Brushed Stainless Steel Letters 07

Need this specified?

Send the artwork and the site details. We will come back with the grade, the thickness or depth, the finish and the fixing method — with the reasons.

Email the factory

Keep reading

More from the knowledge base

Sign letter finishes explained — Polished Mirror Stainless Steel Signage11

Sign letter finishes explained

Brushed, satin, polished, mirror, plated, anodized and painted — what each looks like and what it costs you in maintenance.

Put this into a quotation

Artwork, finished letter height and the site. That is enough to price the job properly.