This technical guide details how to correctly design and specify the grip range for semi tubular rivets. Differentiating grip range from overall length, the article explains the mechanical consequences of using fasteners that are too long (buckling) or too short (incomplete flaring). With practical data on measuring total material stack-ups—including coatings and compression factors—and detailed troubleshooting tables, this post helps manufacturing engineers eliminate vibration loosening and ensure perfectly flared joints in high-volume production.