Equipment Supply Company (ESCO) has introduced the Skirt Nut model 40125 as a replacement for the common wheel attaching nut - the 22-mm x 1.5 flange nut. The Skirt Nut for hub-piloted wheels centers the rim/tire onto the wheel and prevents dangerous vibration, the number one cause of catastrophic wheel offs. The Skirt Nut meets and exceeds Standard SAE J1965.