Overview Reviews Product Description IKO® seals for Needle Roller Bearings have a low sectional height and consist of a sheet metal ring and special synthetic rubber. IKO Catalog Product Videos Custom Field Inner diameter 30mm Outer diameter 40mm Width 4mm Series Metric Product Reviews Write a Review Write a Review × IKO 30 x 40 x 4mm Metric Needle Roller Bearing Seal DS 30404 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *