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Good morning Matthew; I find your post interesting especially since I was looking at the Permanentech Nut system during the last quarter of 2002 comparing it to some other thread locking mechanisms. Check out www.Schirr-Lock.com or www.fastenertechnology.com for another locking nut system you...

Hello MickFlynn; I have read your dilemma and teh comments with great interest. There is a company here in Kokomo that can help you I am sure. I am not affiliated with this company but do know of them and their work. They are very heavy into medical prosthesis and specialty screws. I have...

Hello Cobb; Once again Corypad is right. If we can make some assumptions that the stainless you are using is ASTM F593 speced, and you use 75% of the yield for this product, and assuming that the 'sandwich' you are working is a 'fairly' stiff joint not in excess of 1.25"; and that there is...

Corypad is right. Atlas Copco is probablly the best in what they have to offer. I have had complaints ref their field service. However, they are closely tied to RSTechnology and use their software for controlling and analysis of what the drivers are doing. That is also in their favor. I used...

Big Daz; There is software out there that can help you do this. Check out www.boss/cac.com Use the English version. I think it allows you to switch to metric once you get in I always used a "rule-of-thumb" of 1.5 - 2.0 times the screw diameter, depending on the material, for wall...

Hi CoryPad; If you go to the www.taptite.net site (Which is REMINC) and click on the US area, click on applications, then on FAQ, you will find your very question answered at about the 12-13 question. It sounds like what you really need is joint analysis study. One can be developed using...

A lot of good points have been provided to you from the various sources. I have always said that one test is worth 10,000 opinions. Many years ago I worked with CAMCAR to introduce thread formers to a major OEM transmission manufacturer. After many studies we found that there was no...

Hey gnet2K2; Why not check www.fastenersources.com It lists everybody in the industry. Good luck fastech Bill P. CSFT, Inc.

jimo14; As you have already probably ascertained from each of the responses you have received, there are as many opinions for this as there are writers. Ralph Shoberg, RS Technologies, Ltd. has a recent very unique paper on this very thing. Dr. Shoberg's lab performed most of the torque...

As many have advised you, a true complete tolerance study is neither easy nor cheap. A recent one I was involved in was over $50k VSA from EDS was used. They sent their own people in. I recommend it highly. Merry Christmas & Happy New Year. fastech csft, inc. Bill P. CSFT, Inc.

Wynn - I agree with TWWELD(Structural)and Ron(Structural)on the Loc-tite and stainless steel but would take it one step further. My experience in aluminum engine blocks tells me that you would be better off going to a thread former such as Tap-tite. Due to their shank design they are very...

gpbeau; Markrp has given you some excellent web sites to look at. I suggest both Boltscience.com and fastenersources.com very highly. Also there are a couple of excellent book available titled: An Introduction to the Design and Behavior of Bolted Joints by John H Bickford Hardcover 3rd Rev...

timbob; you do not say how thick the plastic is which could be important to looking at alternative methods of fastening the steel sheet to the plastic. Is the plastic also sheet or do you plan on putting the rivets into a boss? You might want to look into using a Hi-Lo, Plastite, PT, or a...

Your 1 29/32 (1.906) does not appear to be a standard thread size. Neither does the 24 pitch match the bolt size. I have not run across any UNS-3A standards. Everything about this is strange unless it may be a soft converted metric? You might go to www.boltscience.com and ask them. Mr...

You have an interesting challenge before you. The best "quick" source that I know of to begin getting an answer to your problem is the "IPT Industrial Fastener Handbook" by Bruce Basaraba. It can be ordered off the internet at www.iptbooks.com It has a complete chapter...

Sorry for the delay in response. I am new to engtips and am reviewing some old posts. Ford Motor Co. conducted an interesting study (and published in Quality magazine)back in the '70s on this very topic. I repeated the study for GM in the late 80's. You have received some very good answers...

This sounds like a question for www.boltscience.com He is working out of the UK and is very familiar with the DIn specs and can probably answer your question on Acceptable Quality Levels. Bill P. CSFT, Inc.

If your tapped threads are in the aluminum, then you might want to look at thread formers such as the Taptite or PT or other tri-lobular shank fasteners. These thread-formers produce much stronger threads than a cut thread. I did this with a major automotive manufacturer on their transmission...

Does anyone know of a set of tables available or a formula that will aid in determining approximate stretch in various grade and size bolts at the ultimate tensile point? I have a found an interesting table in the www.itw.com website that goes up to 1/4-20 but I am interested in 1/4 up. I...