It looks like this. Originally the shoulder of the bolt was beyond the plastic bit. I am going to replace the plastic with the sleeve above and lock it. Should be OK. Only discussion is whether to use 25 or 30mm bolt. The thread exposed should be same as a normal hanger I think because I don’t want the bolt to land on the end of the spit thread inside, just in case something is in there that might impact the wedge. These hangers have been unobtainium for decades.
View attachment 18369
The bottom photo is pretty helpful in describing what you want to do. Based on your eBay photo, I'm assuming that you're using an M8x1.25 screw, and need the spacer to be 12mm long.
Typical design parameters for threaded connections, is you want 1.5xDiamter in thread-length engagement. So for an M8 screw, you want the threads to be 12mm+ deep. I'm not sure how deep your female-threaded anchors are.
Ass_u_ming that your hanger plate is 2.5mm thick. (+/- .5mm ...) You need a screw that's 2.5 + 12 + 12 = 26.5mm+ long .
Based on that, my recommendation would be...
Hex Head Screws, 316 Stainless
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Button Head Screws, 316 Stainless, Passivated
McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
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If you're ok with either 11mm or 15mm long spacers, I'd recommend these. If you need something closer to 12mm long, go with an "Inch" sized spacer for 5/16" screws, and either 7/16"
(11.1mm) or 1/2"
(12.7mm) long. The inch sizes are more expensive though.
(I have no idea why...)
McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.
www.mcmaster.com