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stainless steel screw
- Thread starter bragee
- Start date
CorBlimeyLimey
Mechanical
Never seen or heard of those. What style of head? Or is it a threaded rod with a through hex.
- Thread starter
- #3
CorBlimeyLimey
Mechanical
So like a regular Socket Head Cap Screw, but with the hex drive throughout. Strange!
Do you have one of these? Does it have any markings on it?
Do you have one of these? Does it have any markings on it?
- Thread starter
- #5
CorBlimeyLimey
Mechanical
Suggest you ask someone at the store.
In the 1970's A company I worked for used a screw like this as a tamper-proof screw on a coin collection device. It was inserted from underneath the part, and screwed into place with an Allen wrench so the only thing visible was the small end of the bolt. The average person looking at the part would assume it was a standard Allen screw, and upon trying to loosen it, would tighten it even more.
we made the things entirely in house with a Hardinge screw machine and broached the hex. I have never seen another until I saw your sketch.Unfortunately that machine shop was bought out and closed in the early 1980's.
B.E.
we made the things entirely in house with a Hardinge screw machine and broached the hex. I have never seen another until I saw your sketch.Unfortunately that machine shop was bought out and closed in the early 1980's.
B.E.
evolvingape
Aerospace
Well I have never seen one of those. Puzzling!
My gut reaction was its a security screw. You drop it into a cavity onto a hex type "key" and then you can turn the key easily. No allen sockets are that thin and long that I know of. Best guess is its the key to Fort Knox but only for those in the know
lol
My gut reaction was its a security screw. You drop it into a cavity onto a hex type "key" and then you can turn the key easily. No allen sockets are that thin and long that I know of. Best guess is its the key to Fort Knox but only for those in the know
lol- Thread starter
- #9
CorBlimeyLimey
Mechanical
Why not ask the management of the store, where they bought them?bragee said:
racookpe1978
Nuclear
1) What part of the screw do you really need to clamp your assembly? That is, do you need the external threads on a cap-screw type head, with the internal hex not needed to go all the way through?
Do you need the internal hex opening all the way through the shaft and head, or only in the cap-screw head part, or only in the shaft part?
Can you live with a round hole at one end or the other? If so, would that round hole need to be larger than the hex opening (tip-to-tip), or internal to the hex openingflat-to-flat?
Do you need external threads at all, just on the end of the bolted shaft, or all the way up the external bolt shaft to the bottom of the head? Can the cap-screw head be square or hex itself? Knurled?
Do you need the internal hex opening all the way through the shaft and head, or only in the cap-screw head part, or only in the shaft part?
Can you live with a round hole at one end or the other? If so, would that round hole need to be larger than the hex opening (tip-to-tip), or internal to the hex openingflat-to-flat?
Do you need external threads at all, just on the end of the bolted shaft, or all the way up the external bolt shaft to the bottom of the head? Can the cap-screw head be square or hex itself? Knurled?
Never seen one with a hex all the way through.
I have seen vented screws which had a round hole all the way through.
I have seen vented screws which had a round hole all the way through.
Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484
What is Engineering anyway: faq1088-1484
It's almost like a banjo bolt, but I'm pretty sure the one I was originally thinking of had a different name. Sorry I can't think of it right now.
Looks like a special.
Misumi do through hole screws:
They also do specials
Misumi do through hole screws:
They also do specials
- Thread starter
- #17
hey thanks for all these answers..
i can't ask to nautical store where they bought them since the nautical store itself is attempting to sell me them for 10 euros the pair.. i won't receive any good indication for sure.
what i need is having the metric thread outside and an internal hole to fit a 5mm dia shaft (a circular hole would be perfect as well).
nautical store parts are always expensive and unfindable (that's why they can sell them to 5 euros each).
the fastest solution could be reaming a 5mm dia hole on each stainless screw one by one or, better, review my design using a drilled plate with two screws to grab it to fiberglass (i.e. something like a nutplate without thread).
i'll go on searching for now..
thanks you all again guys for precious attention
cheers
i can't ask to nautical store where they bought them since the nautical store itself is attempting to sell me them for 10 euros the pair.. i won't receive any good indication for sure.
what i need is having the metric thread outside and an internal hole to fit a 5mm dia shaft (a circular hole would be perfect as well).
nautical store parts are always expensive and unfindable (that's why they can sell them to 5 euros each).
the fastest solution could be reaming a 5mm dia hole on each stainless screw one by one or, better, review my design using a drilled plate with two screws to grab it to fiberglass (i.e. something like a nutplate without thread).
i'll go on searching for now..
thanks you all again guys for precious attention
cheers
Just plain vented screws aren't that special, you should be able to find something. As asimpson says places like misumi should be able to supply them.
Not sure which eurozone country you're in but if you have an equivalent to Mcmaster-Carr or the like then they may even be able to help.
A google search of 'metric vented screw' will turn up plenty of results.
Now if you need the vent holes to be precision, then it might be trickier.
Not sure which eurozone country you're in but if you have an equivalent to Mcmaster-Carr or the like then they may even be able to help.
A google search of 'metric vented screw' will turn up plenty of results.
Now if you need the vent holes to be precision, then it might be trickier.
Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484
What is Engineering anyway: faq1088-1484
DAVIDSTECKER
Mechanical
Are you trying to tighten the screw by the tip instead of the head?
If so you might think about cutting a flat blade screw driver slot in the tip.
If so you might think about cutting a flat blade screw driver slot in the tip.
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