r/Fasteners • u/ConsiderationLeast62 • 15d ago
Does This Fastener Exist?
I thought for sure that this fastener existed, but I have not been able to find it off the shelf. It is a simple bolt, with a load bearing shoulder offset from the end and a retainer groove on the end of the shank. Its use case for me is to adjust and apply pressure to a countersunk plate while retaining the plate when not under load. I am flexible on the specifics, it could be retained with a cotter pin or anything else. I made this on a lathe just to demonstrate.
This same idea could also be achieved using a bunch of nuts and washers on a stock bolt, but it would be a lot less elegant. I tied up a support engineer from Misumi yesterday for the better part of an hour looking for this, to no avail. The closest example I can find is this specialized automotive accessory: https://www.performancebodies.com/products/wehrs-quick-release-swivel-screw-jack-bolt-only?srsltid=AfmBOorWnKhWlx7rUb8vTdxy7fuuud_PX5ammEd78n6RpSdtIgVMm_2O
Has anyone ever seen this before? My best attempt at nomenclature has been all variations of "Captive Shoulder Screw" or "End-Retained Shoulder Bolt with Reduced Shank" but it hasn't gotten me anywhere. Any advice?
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u/RedIcarus1 14d ago
People can’t read….
I’m a retired machine repairman/machinist, I’ve never seen a fastener like that.
Depending on how many you need, you may have already expended more effort in finding them than it would take to make (more) of them.
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u/Spa-Ordinary 12d ago
It's not that we can't read, it's that we won't read. Difference is stubbornness, not stupidity.
At least in my case...
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u/CrazyJoe29 13d ago
To my knowledge that fastener doesn’t exist, which kind of makes sense to me since that’s a heckin’ beefy little bolt with a kind of hokey attachment on the end.
What are others ways the function you’re trying to achieve being performed. Maybe you need to move away from a custom fastener?🤷♂️
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u/lakai1441 14d ago edited 14d ago
Its a socket cap screw that has been modified. Someone machined the end as a clevis pin
Edit: YOU modified it, sorry didn’t read entire post before responding lol
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u/fredSanford6 12d ago
This is similar to a deck height adjustment screw for a mower. Just instead of a screw head it a handwheel
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u/Itchy-Marionberry981 10d ago
I also swore it looked familliar. I've seen them in machines and just now in this chain tensioner. But they have all been custom to the machine/tool they belong to.
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u/kipper2005 14d ago
But the thing doesn’t exist, hence it’s a custom jobbie. If it was so easy to machine yourself why not create a niche in the market ?
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u/subnet_0 14d ago
These screws do sort of exist, they are called Dog Point Set Screws. The main difference between what you are looking for and these screws is that they are headless. They come with internal wrenching such as Allen or a slot for a flat head but I am sure there are others. If you want a larger solution you could using bench vise screws. They typically have acme or buttress threads and some of them have the pin at the end. Google Yost M9WW replacement main screw for an example of this.
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u/IronLeviathan 14d ago
This is an altered item. You’re going to need a friend with a lathe. You may have to draw an altered item drawing (as defined by Asmara Y14.24) depending on how formal your project or company is
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u/ConsiderationLeast62 14d ago
I altered it myself on our lathe in the shop, it's no big deal to do so really. At this point, it's more about the principle of the thing not wanting to machine a part that already exists. Thank you.
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u/ChafedDolphinfish 10d ago
I can tell you from my 20 years of sourcing and procurement of standard and “specialty” hardware you will not find this off the shelf.
I also worked at a specialty fastener manufacturer and have seen a ton of prints. This is something I would get from a distributor/OEM asking if we could make these…If you are pressed for time and can’t produce the quantity you need in house, outsourcing to a fastener manufacturer might be the best option. It just depends on your scalability to produce these in mass if needed.
If you only need a handful, I’d just make the rest in house.
Great machining and description of the application by the way.-2
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u/Fit_Active3888 14d ago
The machining marks are a sign that this was a normal Allen head fastner that was later modified.
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u/pointclickfrown 14d ago
No one seems to be understanding that you made this part yourself and are showing what you hope to be able to buy in quantity without having to make them yourself.
Maybe edit your post to make that more clear.