Home / Recreation / Treadmill Screw 239421 Treadmill Screw 239421$2.16 Price may not be up-to-date. In Stock View Product Part Number: 239421 Brand: PROFORM FITNESS PRODUCTS, INC Seller: Sears PartsDirect Category: Recreation Not Returnable Description This screw (part number 239421) is for treadmills. Follow appropriate safety practices when installing screw 239421.