What kind of bolt is this?

[JakeAdkins]

You can see the attached poorly drawn sketch, but I am looking for something kind of like a shoulder bolt but the shoulder part is a lot bigger than the bolt part. (Something in the neighborhood of a 1" shoulder to a 0.25" threaded)

This is not going to see any load it is a target for a prox sensor to pick up on. I am just wondering if this is something that I can easily buy rather than trying to get it made. Thanks

 

[CorBlimeyLimey]

Why not just use a 1" bushing/spacer and a regular screw?

 

[ornerynorsk]

Make a counterbored bushing and attach it with your 1/4 bolt.

 

[MadMango]

What about using a metal flag, similar to a rectangular washer with an off-center hole that you attach with a 1/4" screw and bend into sensing position?

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read faq731-376 to make the best use of these Forums?

 

[CorBlimeyLimey]

Reid Supply (

http://www.reidsupply.com)

or a similar company may have what you need.

 

[JakeAdkins]

I was wanting it to be a one piece thing, I checked both reid and mcmaster but they didn't have anything.

It was kind of a shot in the dark to see if anyone had com across something like that and knew what it was called. Thanks for the input.

 

[Artisi]

Go to your local machine shop - they will make what ever you want.

 

[unclesyd]

I think your best bet would be to get a 1" stripper bolt of sufficient length and turn down the threads, cut off the head, cut a slot to drive it. A big screw driver will drive a 1/4" bolt.
If you absolutely have to have an internal hex drive you could have made by EDM,

http://www.suburbanbolt.com/shopping_list2.asp?phase=8&product=19

I don't believe it has a name as you essentially have a stripper bolt with no head and small thread end. There are dowel pins that have internal threads, but no drive end.

Is there any quanity involved?

 

[gerhardl]

As this is what you describe as a 'flag' for a proximity sensor, I would suggest that you have it made from bar stock of suitabel material.

The most complicated machining seems to be the mechanical grip for the 'screwdriver' or wrench (whatever).

As a proximity flag the application surroundings could perhaps indicate the wish of a simple, smooth-faced surface and as simple mounting/demounting as possible.

You could perhaps evaluate reforming the grip/slot for fastening to to a diagonal bore, later plastic-capped, or the device made totally from hexagonal bolt, or square machined top or bottom for wrench?

 

[rlee629]

"...best bet would be to get a 1" stripper bolt of sufficient length and turn down the threads, cut off the head, cut a slot to drive it. A big screw driver will drive a 1/4" bolt.
If you absolutely have to have an internal hex drive you could have made by EDM"

This is not an off the shelf part. Now, the above statement from unclesyd is correct provided you have to have hardened material, you cannot drill/broach a hardend part. From your description of the application not being load bearing, go with a low carbon steel that can be easily machined (1018, 12L14) and broached (for internal hex). Sinker EDM is a longer process = more expensive.

 

[MikeHalloran]

A 1/4" AllenNut with a short piece of allthread loctited in might work.



Mike Halloran
Pembroke Pines, FL, USA

 

[chicopee]

The main object looks like a cap screw. The wiggles I don't know.

 

[mayt4u]

Most vibration people have this type of setup to screw in their transducers. Try RID etc.

 

[Timelord]

The simplest solution I see is to make a bushing and press fit a 1/4 inch socket head cap screw in the hole. Once assembled it will be one piece (per OP's request) and the machining is relatively low cost, just cut off 1 inch G&P shaft and drill and counterbore the hole. Should be cheaper than modifying a stripper bolt.

Timelord

 

[DiamondDave]

Cant you drill into a bit of bar or pipe and run a tap down it and then just screw the bolt into it? or as someone else said make a bush for it.

Do you have a machine shop at work they could make you a few for spares.

 

[JakeAdkins]

Thanks for the replies. I was hopping that the part in question was something I could buy off the shelf, cheap and easy.

 

[unclesyd]

You might do a search for parts like these.

http://www.fastenersuperstore.com/stores/superstore/standoffs.cfm?gclid=CPTNru3jr5gCFRJxxwodnBKfUg