Shoulder Screws Question
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Posted by: Rage_Wizard

12/12/2005, 09:12:22

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I am currently designing a hydroform tool that is in need of a 3/8" shoulder screw. Due to packaging restraints, it would be a benefit if the shoulder screw was of a headless type. My question is this-- Is there such a thing as a headless shoulder screw? and if so what are they called? and finally who makes such an item so that I can order them?






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Re: Shoulder Screws
Re: Shoulder Screws -- Rage_Wizard Post Reply Top of thread Forum
Posted by: JasFast

12/16/2005, 08:06:37

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Let me know more about exactly what you need (sizes, threads, drive, application, ect). I've worked in the cold heading (fastener) industry for a number of years...and yes, I've designed and manufactured many "headless" shoulder bolts/screws. In fact, they are often less expensive and easier to produce than a "headed" shoulder screw.





Modified by JasFast at Fri, Dec 16, 2005, 08:10:07

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Re: Shoulder Screws
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Posted by: MarkV

12/13/2005, 10:02:50

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Are these for positioning?






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Re: Shoulder Screws
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Posted by: Rage_Wizard

12/13/2005, 10:40:33

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NO, IT IS ONLY FOR RETENSION. IS THERE A WAY TO POST A JPEG OR SOME OTHER VISUAL FILE ON THIS FORUM?






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Re: Shoulder Screws
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Posted by: MarkV

12/14/2005, 08:00:35

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hmmm I guess I am confused, if it does not have a head, how does it retain anything?






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Re: Shoulder Screws
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Posted by: Rage_Wizard

12/16/2005, 09:29:43

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The particular size is a standard 3/8" shoulder screw with everything being standard except for the fact that I don't have room for a head on the shoulder screw. The particular use is for an ejection insert that is mounted to a cylinder rod that has a thru slot. The ejection insert is guided by other cavity inserts that will only allow for travel in Z direction. Under a hydroforming pressure of 2000 Bar we have noted a significant amount of compression in the ejection system. A means of shiming the insert must be accounted for, so the shoulder bolt is used for retaining the insert in the hydroforming cavity while also allowing for easy installation of the insert with out dis-assembling the other cavity inserts in the tool. The shoulder bolt does not see any shear loading during the ejection phase of operation. It does see shear loading on the retraction of the insert, but this is only the weight of the insert which is about 20 lbs.






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Re: Shoulder Screws
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Posted by: JasFast

12/16/2005, 21:32:18

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Am I correct in assuming that you need some sort of recess in the end of the screw for a driver/bit? I have worked on a few "headless" fasteners that had either a torx or hex recess in the end of the shoulder to provide a means for tightening.

How many of these fasteners do you need? If the quantity is in the thousands, then I can probably help you out. If you need only a handful, then you may want to consider having someone cut down the o.d. of the head on a standard shoulder bolt.







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