Spherical Washer Assembly, Bottom Washer Inside Diameter 0.406 in, Bottom Washer Outside Diameter 0.875 in, Bottom Washer Radius 1.25 in, Dimensional Standards TCMAI, Finish Plain, For Screw Size 3/8 in, Material Stainless Steel, Material Grade/Class 18-8, Maximum Rotation 5 Degrees , Maximum Thickness 0.25 in, Minimum Thickness 0.25 in, Pack Size Small Pack, Rockwell Hardness 27 on 15N Scale, Spherical Washer Type Spherical Washer Assembly, System of Measurement Inch