SKF Vibracon SMSW 20-ASTR Spherical Washer - A precision-engineered spherical washer designed to create an exact, parallel plane between the bolt head and mounting surface. This surface-treated washer automatically adjusts and compensates for angular deviations, preventing bolt bending and ensuring even bolt tension distribution in demanding industrial environments. Key Specifications: Model: SMSW 20-ASTR, Bolt Size: M20, Outer Diameter (D): 42 mm (1.65 in), Inner Diameter (d): 23 mm (0.91 in), Height (H): 60 mm (2.36 in), Weight: 0.7539 lb, Material: Alloy Steel, Surface Treated (Nitrocarburized), UPC: 7316576074592. Ideal For: Machinery mounting on SKF Vibracons, Applications requiring precise bolt alignment, Industrial environments with angular mounting surfaces, Equipment installations needing vibration isolation, Machinery that must be level and secure. Features: Surface-treated for corrosion protection in humid and harsh environments, Automatically compensates for angular errors up to 4°, Evenly distributed bolt tension for extended equipment life, Reduces bolt fatigue from bending bolts, Allows improved bolt stretch for increased clamping force, Eliminates need for expensive machining or epoxy resin chocks, Available in standard and low-profile versions