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What are the differences between Excelta "S" and "SA" tweezers?

By Greg Johnson on Mar 11, 2013 at 12:33 PM in Tweezers and Forceps

The two most common materials we make tweezers from are Stainless (-S) and Stainless Anti-Magnetic, Anti-Acid (-SA). We put letter designations after the dash to indicate the type of material the tweezer is made from.

For example, a 7-S is a 7 style tweezer made from 400 series stainless steel. 400 series stainless steel is a combination of Chromium, Carbon, Silicon, Manganese, Molybdenum, Phosphorus and Selenium in an Iron base. It is rust and corrosion resistant, has strong tips, but can retain some magnetism and will stain under extreme conditions.

7-SA is the same style tweezer made from 300 series stainless steel. 300 series stainless steel has a higher Chromium, Molybdenum and Manganese content and contains Nickel. This alloy is much more corrosion resistant, is anti-magnetic and more resistant to hydrochloric and nitric acids. The drawback is these added features make the material softer.

S material tips are typically 20 points harder on the Rockwell C scale then SA material tips.