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15 comments
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Join Date: May 2011
Posts: 6

How to Call a Cap Above a Screw?

05/11/2011 5:24 AM

what are the names or terms for a kind of cap or plate that prevents a nut or screw or bolt from unscrewing and pop-out? I refer to an adjusting nut or screw or bolt that is positioned inside a tool or machine and there is a need to prevent it from getting out completely when unscrewed by operator or technician so it will not get lost. in order to get to the screw one has to remove or move this plate. thanks!

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Pathfinder Tags: nut screw bolt
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#1

Re: How to call a cap above a screw?

05/11/2011 6:21 AM
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#2
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Re: How to call a cap above a screw?

05/11/2011 7:04 AM

My intention was something like the attached image.( Sorry for the quality.) This "cap" is covering a bolt shaft.

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#3
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Re: How to call a cap above a screw?

05/11/2011 7:11 AM
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#5
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Re: How to call a cap above a screw?

05/11/2011 7:33 AM

OK, that's closer. But it's only a temporary solution.

Is there an item that is placed on top of the bolt shaft and constantly pressing it down like "Screw Retainer Type Push On Fastener" that can be fixed above the bolt?

thanks.

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#7
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Re: How to call a cap above a screw?

05/11/2011 7:56 AM

Here's another.

http://www.daemar.com/dmr_push-on_fasteners_59.html

There are probably hundreds of different types. If you use your quote from above and do an internet search you are bound to find the exact one you are looking for.......................eventually.

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#4

Re: How to call a cap above a screw?

05/11/2011 7:32 AM

Most of these types of covers are called just that "cover plates". They are used in some machines where counter bores are installed to keep trash and dirt from the screw area. They also I assume could be used as you suggested, but I have never run across them for that type of operation. Normal fastener locking procedures usually apply.

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#6
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Re: How to call a cap above a screw?

05/11/2011 7:50 AM

Thanks for the efforts!

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#8

Re: How to Call a Cap Above a Screw?

05/11/2011 9:17 AM

Widgetco offers these Hole Plugs Plastic Hole Plugs are the perfect product to cover holes in a variety of projects. Several sizes are available to fit hole diameters of 3/16", 5mm, 1/4", 8mm, 5/16", 10mm, 3/8", 12mm and 1/2". Wholesale prices for bulk.

The problem I see is that these will get lost, too.

I'd look for a swing-away metal cover that can be attached to the machine permanently.

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#9

Re: How to Call a Cap Above a Screw?

05/11/2011 12:01 PM

I am a little confused... not a surprise to some members.

You tell us "...there is a need to prevent it from getting out completely when unscrewed by operator or technician so it will not get lost." Now, this sounds like it might be like requirement 1.4.2.1 of Essential Health and Safety Requirements, per the Machinery Directive. This says "...fixing systems must remain attached to the guards or machinery when the guards are removed." If this is your quest, these guys have a number of products, some similar to your sketch (usual disclaimer).

But then you say "in order to get to the screw one has to remove or move this plate.", which does not sound like a captive or retained fastener at all.

Can you clarify?

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#10

Re: How to Call a Cap Above a Screw?

05/12/2011 12:39 AM

Generally, when the screw can move a little, the screw, nut or bolt are called captive screws, nuts or bolts and the retainer is called a cage.

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#11

Re: How to Call a Cap Above a Screw?

05/12/2011 6:27 AM

I recall these being called. The shaft of the screw is smaller than the threads and the hole in the panel just fits, so the threads can not come out. there are methods of fabricating the screw with higher threads on the hole so you have to unscrew it through two sets of threads. Sometimes there are foolprrof ways to capture it.

These links will show all

Captive Screws

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#12

Re: How to Call a Cap Above a Screw?

05/15/2011 5:54 AM

Ok, we're getting closer,

I'm looking for the name or brand of some kind of "Captive Fastener"/"flat type receptacle" that is laid over a deeper screw/bolt, and pressing on it, with the option to turn the screw while it's inside. You can see a resemblence to the image attached.

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#13
In reply to #12

Re: How to Call a Cap Above a Screw?

05/15/2011 2:46 PM

Are you perhaps looking for a 1/4 tun fastener?

Also known as; oddie fastener

many styles

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#14
In reply to #12

Re: How to Call a Cap Above a Screw?

05/15/2011 9:17 PM

What you have drawn is referred to as a speed nut - google 'speed nut' - they are used extensively in the auto industry for fast assembly of vehicles.

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#15

Re: How to Call a Cap Above a Screw?

05/16/2011 12:26 AM

Thank you all for your help!

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