CAUTION. BS A 257 bolts have cadmium as a plating material which has been restricted and/or banned for use in many countries owing to environmental and health concerns; they should not be used in new product designs. Local officials should be consulted about any concerns on the use of cadmium-plated parts. In addition, cadmium plating on titanium parts has been documented to result in stress corrosion and also solid metal embrittlement (SME) when exposed to relatively low temperatures. Accordingly, BS A 258 has been introduced as a replacement.