4. Corrosion Anchor bolts, particularly those made from carbon steel, are vulnerable to corrosion when exposed to moisture and other corrosive agents. Corrosion can weaken the bolts and their connection to the structure, increasing the likelihood of loosening.
3. Sealing Capabilities The primary function of washers is to provide a seal that prevents the ingress of moisture, dirt, and contaminants into bolted joints. EPDM washers achieve this effectively, minimizing the risk of corrosion and wear, which can compromise the structural integrity of components over time.
ERIKS type M (type B according to the DIN standard) has a single metal casing and rubber sealing lip. Since the casing is made of metal, it must be fitted in a well-finished, undamaged groove. Large volumes of oil seals with metal casings are often cheaper, which is why they are often used as original equipment in machines. However, if an oil seal has to be replaced, types with a rubber exterior (type R or RST) are easier to fit. Type MST is similar to M and commonly used. The difference is the dust lip in the MST oil seal that prevents dust and dirt reaching the sealing lip, and extends its service life in dusty environments.
Figure 1: Types of sealing devices
