I spoke to our product manager and confirmed that, no, this bolt is staked in place with a metal press and is fixed through the ball bearing swivel mount.
neralizade, thank you for your question. Unfortunately, in this caster we do not have a friction grip stem, only the threaded stem. We do have a 3" TPR caster with a "grip ring" stem our Shepherd Hardware item# for that caster is 9807. If this item is not carried at your local Home Depot, you can go to the Pro Desk and have them do a special order with us.
The overall clearance of this caster (not including the stem) is actually 4 inches.
Which is it? 3/8th or 5/16th? There are two answers.
Yes - pull the nyloc nut - remove the shaft - remove the wheel. Toss out the pivot arm and the flanged washer (on the inside). Then put the shaft back through the wheel (there is a notch that lines up with the tang on the head of the bolt. Then tighten the nyloc. Be careful the amount you tighten - you can "flex" the side inward and bind the wheel. I have used 40 of these and pulled the brake on 1/2 of them without issue.
Currently $3.88 when purchased online.
3" diameter of the wheel itself
In theory the answer is YES. I have put 40 of these to use on 10 different carriers. I have had 8 fail where the carriers had 400lbs on them. If you are talking pure "dead weight" then they probably have a higher number. But if like me - you have any "dynamic component" (think of rolling along and hitting bumps and cause the load bounce - or something being sent down "not so gently" ) - then you need to de-rate these.