Which step follows placing the tube in the flaring block when making a single flare?

In the process of making a single flare, after placing the tube in the flaring block, the next logical step is to position the fitting nut and sleeve on the tube. This step is essential because the nut and sleeve are necessary for securing the fitting to the flared end of the tube. When you insert the tube into the flaring block, it’s crucial to prepare it for connection to the fitting, which is accomplished by slipping the fitting nut and sleeve on the tube before the flaring process begins. This ensures that once the flare is created, it can be tightened effectively to form a leak-free seal.

The other steps listed do not directly follow placing the tube in the flaring block. Striking the plunger is a subsequent action that occurs after the tube and fittings are properly aligned, and the clamp bar tightening happens before creating the flare to secure the tube in place. Centering the plunger over the tube is crucial for the flaring process, but it should be done after the fitting components have been applied for a complete connection.