Bolt material / AL die casting
Bolt material / AL die casting
(OP)
Guys,
I need some help in choosing right bolt material.
I have a 1/4-20 tapped hole on an AL die casting. the vendor screws a stainless steel bolt in that hole and ships to us.
We wanted to check the lenghth of the bolt, so we tried to remove the bolt out. The bolt actually stripped the threads.
I am not sure if the vendor is not tapped the holes right or the Bolt material is too hard for the application.
any help is appriciated.
Thanks
NT
I need some help in choosing right bolt material.
I have a 1/4-20 tapped hole on an AL die casting. the vendor screws a stainless steel bolt in that hole and ships to us.
We wanted to check the lenghth of the bolt, so we tried to remove the bolt out. The bolt actually stripped the threads.
I am not sure if the vendor is not tapped the holes right or the Bolt material is too hard for the application.
any help is appriciated.
Thanks
NT





RE: Bolt material / AL die casting
http://www.eng-tips.com/viewthread.cfm?qid=217587
I forget how good the porosity etc. of die cast Al parts is but tapping into castings can sometimes be an issue.
How about looking at a helical insert of some kind in to the aluminum part, especially if it's getting given any significant torque/load.
Another option might be some kind of antiseize/anti galling but I'd lean to an insert.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Bolt material / AL die casting
http://www.stu-offroad.com/suspension/arm1/bolt-3....
RE: Bolt material / AL die casting
I agree with KENAT. It is policy in many organizations to systematically use thread inserts in aluminium to prevent thread galling and stripping. Helicoil inserts are Keenserts both work as thread repair kits, so you might as well order something now!
Anodizing your aluminium parts will reduce, although not eliminate, your thread galling problem.
--
JHG
RE: Bolt material / AL die casting
Ted
RE: Bolt material / AL die casting
RE: Bolt material / AL die casting
Inserts? Will they not pop out?
I am thinking a Blind thread 1/4-20 1.0IN deep. are there inserts avilable for this that strong and wont pop out.
I am planning on using 200-250lbs load on it.
Secondly, I suspect that the tapping might be a culprit too. May be the bevndor isnt consistently using all 3 taps (first second & bottoming taps). But, hard to control this.
Lastly, I like the idea of Lubricant on screws.
Thanks again
NT
RE: Bolt material / AL die casting
RE: Bolt material / AL die casting
I just lost two days on a outage because stainless steel pipe threads (3 inch NPT pipe) galled badly in the IR compressor cast aluminum nozzle.
RE: Bolt material / AL die casting
You don't say what the load on the screw is, you don't say what type of environment the part is subject to etc.
However, inserts have advantages over just using anti-seize in a tapped cast part for strength and potentially durability reasons. They effectively create a 'larger' thread in the cast aluminum part which can be beneficial for strength.
http://www.helicoil.in/pdf/HeliCoil%20Catalogue.pd... only appear to go up to .75 deep but that may be more than enough. How much load is going on your bolt that you need 4X major diameter depth?
We used helicoil inserts in cast & forged (as well as machined) aluminum airborne parts routinely at a former aerospace/defense employer.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Bolt material / AL die casting
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Bolt material / AL die casting