Sliding door replacement wheels
Thank you for reaching out to us. Our 81-247 is similar to the roller shown here. We recommend you review the specifications to confirm whether they match your repair needs.
The wheel is made of nylon, making it more susceptible to wear and tear, especially with heavy doors. Unfortunately, we do not sell the assembly with a steel wheel. If the old wheels are in good shape, you may be able to swap them with the nylon wheels. We offer the 81-310 axle repair kit for this purpose. Take a look along with the video below and see what you think.
The 81-247 patio door roller, which features a nylon ball bearing wheel, is well-made. Its size suggests that it is suitable for either a sliding window or a patio door screen. However, the weight of the patio door can cause issues over time, as you mentioned in the threads about the fasteners not holding. I don't see anything else that can be added to this.