The Omega Products ISO 7388/2-A Hollow Pull Studs are precision-engineered fasteners designed for ISO 7388/2-A tool holders used in machining operations. The hollow design enables coolant to flow through the center, supporting efficient chip evacuation and effective cooling during cutting. These pull studs are optimized for through-coolant systems, helping maintain steady cutting conditions and reliable performance. Without an O-ring, these pull studs are specifically intended for through-coolant setups where coolant is delivered directly to the cutting zone. This design promotes direct coolant access, reduces flow restrictions, and enhances tool stability and precise positioning under demanding machining conditions. Hollow center for through-coolant flow: The hollow construction allows coolant to pass through the stud, improving cooling and chip evacuation at the cutting edge for cleaner, more consistent performance. No O-ring design for through-coolant systems: Eliminates interference with coolant flow, simplifying integration into through-coolant setups and supporting direct delivery to the cutting zone. ISO50 precision and compatibility: Manufactured to ISO standards for reliable mating with ISO 7388/2-A tool holders, delivering consistent clamping force and precise tool positioning. These pull studs deliver reliable, repeatable performance in demanding production environments. The combination of hollow core, O-ring-free design, and ISO-standard precision helps reduce setup time, maintains tool alignment, and supports longer tool life through improved cooling and stable clamping. Choose these pull studs for confident installations, predictable results, and durable performance in through-coolant machining applications.