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Specialty Fasteners (double-ended stud???)

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Bob Kirk

01-06-2002 17:40:08




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I have a casting that is supposed to be attached with 1/2" bolts, but where a former owner drilled and taped one hole for a 5/8" (course thread) bolt. The casting cannot be drilled to 5/8 because the margin of steel around the hole is already minimal.

Has anyone ever heard of a steel stud that is one diameter at one end and a different diameter at the other? What I need would be 5/8" (course) for 1 1/4" of length at one end and 1/2" (any thread) for about 1 1/2" of length at the other end.

Thanks for your thoughts.

Bob

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Wayne Woods

01-07-2002 07:58:51




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 Re: Specialty Fasteners (double-ended stud???) in reply to Bob Kirk, 01-06-2002 17:40:08  
Bob, another option might be to use one of those thread repair gixmo's. When a threaded hole gets stripped, you need to drill out to next largest size, tap it for that size, then the thread repair (i.,e. helicoil) goes in, and brings it back to original size. In this instance, sounds like you've already got the next larger size hole threaded. Check your local fastener speciality shop. Auto parts stores may also have them.

WW

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Bob Kirk

01-07-2002 16:21:14




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 Re: Re: Specialty Fasteners (double-ended stud???) in reply to Wayne Woods, 01-07-2002 07:58:51  
Wayne: Your idea was my first thought. But when I checked the "Heli-coil" brand repair kit, I found that the existing 5/8" hole is too BIG to accept the tap for the 1/2" Heli-coil repair coil.

So unless you know of a type of repair kit that needs a hole as big as 5/8, that approach won't work.

Thanks very much for your thoughts.

Bob



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Wayne Woods

01-07-2002 17:25:41




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 Re: Re: Re: Specialty Fasteners (double-ended stud???) in reply to Bob Kirk, 01-07-2002 16:21:14  
Bob, There are two different thread repair products which will bring your 5/8 threaded hole back to the 1/2 size for you. "Re-Nu-Thread" and "Jergens". You can get both from MSC (Machineshop Supply Corp) For 5/8-11 to 1/2-13: use either Re-Nu-Thread with MSC order number 06849277 ($1.59) or the Jergens product MSC order number 82496381 in carbon steel($3.21), 8247736 in stainless(10.84). I'd recommend the Re-Nu-Thread product, as you don't need to purchase an installation tool. Just use a bolt with jam nut to turn the insert in. This one holds itself in like the self locking nuts work. And, as you can see, it's lower cost. If you want to really ensure it stays put, use some of the permanent thread locker on it. If you ever need to get it back out, heat will make the thread locker turn loose.
If you go this route, you won't have to mess with one non-standard bold. (If you're like me, Murphy's law guarantees you'll have to take it apart again, sometime!

BTW, to phone your order in to MSC, their # 1-800-645-7270. They'll have in on it's way to you the same day. I'm only about 25 - 30 miles from their South Central PA distribution plant, and I usually get stuff from them the next afternoon!

Good luck

WW

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JK

01-06-2002 19:34:30




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 Re: Specialty Fasteners (double-ended stud???) in reply to Bob Kirk, 01-06-2002 17:40:08  
Bob,
I have made what you are talking about a couple of times to fix things that I have found that were messed up by someone before I got it. I took a bolt with the larger diameter and chucked it in the lathe in 2 nuts to hold it well and protect the threads. I then turned it down to the smaller diameter and threaded it with a die. If you don't have access to a lathe I'm sure a machine shop could turn one down for you & you could thread it yourself or they could do that also.
John

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