Unsolved Mysteries, lol.

 

Well...vendor specific parts arent normally inventoried.

Like...Honda doesn't have a PN for each resistor inside the radio that they buy from (supplierX). If a customer's radio failed...they can't buy that resistor from Honda. Honda simply appends a PN to the whole radio and inventories the whole radio for sale.

Or like...you can't buy just an impeller for the water pump

Or just the dust seal for a bearing...

They don't even sell/inventory ball joints or bushings...partly because they come as an assembly.

KnowwhatImean?

Its just strange to sell the screw to the public if its ONLY used for Honda internal purposes.

 

Oh I understand what you mean. Parts that come to us as an assembly, the individual parts are called child parts to us. We can get those parts from the supplier for repairs but they are not available to the public.
FYI I queried the part number and my system shows it being used on civic since 1980 and every year since and basically every model through the years.

I agree there is probably some benefit to using a screw that Hondas engineers decided to go that route.
On the same token some cars don't have them at all so they don't seem critical to me. I do reuse them on all of my vehicles though it is nice having the rotors held in place when reassembling.

 

I think the reason I posted a few posts back is about the only reason I can think of them being useful beyond assembly. But it is a valid reason. If a wheel started to come off without the brakes pressed, and the rotor starts flopping around and starts depressing the caliper piston, then when you realize something is wrong and stomp on the brake you may lose a lot of the pedal on the first press. Again, not something that happens a lot but is a safety related thing.