The Phidgets Jaw Coupling Half 25mm Series 38 is an aluminum coupling designed to connect a 25mm shaft to another shaft using a spider. It is secured with two set screws and is compatible with other Series 38 jaw couplings, accommodating different shaft sizes. This coupling is suitable for high-torque applications, supporting torques up to 3300 kg·cm and speeds up to 4000 rpm. It features an 8mm keyway for a secure connection to a keyed shaft. The coupling spider and the other half are available separately.