The tilt brake on my office chair broke and now it freely leans forward or backward making it unusable (sitting in it normally makes you lean forwards and nearly slide out). I've taken it apart and found the culprit to be this flanged pin which has sheared in half which I'm not entirely sure the name of.
Here's the pin: https://www.dropbox.com/s/hg7kvkkwm1j5z ... 9.jpg?dl=0
Here's how it was being used: https://www.dropbox.com/s/5vvqfo2p7qjug ... 1.jpg?dl=0
It was going through those metal blades just like the other pin that's intact in the image, and when I pulled on a two-position lever it would apply pressure on the broken pin and a third long partially threaded shaft somehow which would lock the seat of the chair in place.
I need to find a replacement pin that's strong enough. I've measured the broken pin using my calipers and have found it's 5/16th inches in diameter and about 2+5/16 inches in length. The length doesn't have to be too terribly precise because I can cut it down if I need to. The thickness of the flange on the head is about 1/32 of an inch (here's a pic: https://www.dropbox.com/s/bdfyzjpo2a8xm ... 1.jpg?dl=0
). The head can't be too thick or it won't fit underneath part of the chair mechanism. The head diameter is nearly 7/16 of an inch.
Anyone know what this pin is, and how can I find an appropriate replacement pin that will be at least as strong? What kind of steel should I look for?