Need Help!- Anybody know what type of screw this is??

[Dragnink]

I'm not sure of the name of this type of screw which is probably the source of my problem. The only information I know is that it's a hex/allen head, the threads are imperial and the head diameter of the screw is about 5/16".

The closest cousin I found was something called a "low head socket cap" screw but the one in the photo above seems to have a thicker head than any that I see at the hardware store or online.

Also curious of any suppliers of mini spec hex/socket cap screws of all types in sizes down to 0-80. I've bought some from smallparts.com but they are pretty expensive.

Thanks guys.

[Eurisko]

Button head hex socket screw?

[Dragnink]

I think those have the domed heads. Interestingly enough though, I plugged that into google and the screw to the left of the screen in the middle looks almost exactly like what I need. Just don't know the technical name for it.

Originally Posted by Eurisko Button head hex socket screw?

[neseng]

Judging by your photo, it looks like a hinged joint or linkage. I would say that the screw is a 'SOCKET SHOULDER SCREW'. Have a look at http://www.covfast.com.au/coventry/d...try_fasteners/ or any other good industrial fastener supplier and you should find information on them. Alternatively, just enter SOCKET SHOULDER SCREW into Google images and you will get a good idea of what they look like.

Cheers from 'Down-Under'.

neseng.

[mactec54]

Hi Dragnink

If this has a straight plain dia under the head with a smaller dia thread on the end then it is called a Shoulder Bolt/screw that is what is used for that type of application

[Dragnink]

Thanks guys, it might be a socket shoulder screw. The only thing that hints it might not be is that there is a threaded/tapped hole directly under the head of the screw and the threads continue at the bottom of the part in the picture. The socket shoulder screws only look to be threaded at the opposite end of the head.

Thanks

[hawkburger]

If that joint is a constantly moving one or a HINGE, then I would say that it is a custom made part assembly. The treads are on the top and bottom and the pin is in the middle and the inner allen screw holds the cap which prevents the pin from unscrewing itself out and applies tightrning pressure on the joint. So it's a "unique" piece , fashioned out of stock materials.

[Dragnink]

For sure, yep.. this is actually a joint that swivels. The screw threads in from the top and continues through the joint and picks up again where the threaded hole runs through the bottom. Where the tendon connects in the middle, they might have put a small washer/tube inside around the screw to lessen friction, not sure.

Originally Posted by hawkburger If that joint is a constantly moving one or a HINGE, then I would say that it is a custom made part assembly. The treads are on the top and bottom and the pin is in the middle and the inner allen screw holds the cap which prevents the pin from unscrewing itself out and applies tightrning pressure on the joint. So it's a "unique" piece , fashioned out of stock materials.

[mactec54]

Hi Dragnink

If it is none of these then it has been custom made

[juergenwt]

Looks to me like a modified Shoulder Screw. If it has an internal thread on the bottom than somebody cut off the shoulder screw thread and tapped the bottom to secure the bolt with a washer and a screw. Could have used a longer shoulder screw and secured it with a washer and a nut. Whatever - custom made.