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  #1  
Old 12-08-2012, 01:43 AM
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Question Sheet metal bracket attachment

This is a pretty basic question, but I could use suggestions. I am going to attach ignition coils with simple brackets to my firewall. What options should I consider for fastening them? I've used sheet metal and self tapping screw's in the past, but there's got to be a better way.I need something blind because the back side isn't accessible. What about rivet nuts? Any ideas?
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Old 12-08-2012, 02:04 AM
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Originally Posted by TheBandit View Post
What about rivet nuts?
Perfect choice as long as you got the tools to insert and crimp proper they work great.. I do recommend cerated certs, but a few to choose from... hehe.. as far as size... 1/4-20 with SS button heads to boot ...

I could say more, but on the fly.....

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Old 12-08-2012, 02:13 AM
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I'll second the dog here. Serrated in steel, the brass ones will likely wear themselves out from vibration.

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Old 12-08-2012, 03:25 AM
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Dang... I need how to spell "Serrated" ..

thanx bro

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Old 12-08-2012, 05:12 AM
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Red face

Me I might go a little different.

I would make myself a bracket drill and tap to mount the coil brackets .

then weld it to the firewall .

That is just about the way i attach any thing like that
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Old 12-08-2012, 06:53 AM
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Me I might go a little different.

I would make myself a bracket drill and tap to mount the coil brackets .

then weld it to the firewall .

That is just about the way i attach any thing like that
I feel your pain Bro.. and exactly as I would of done before someone put out these nutcert things that make things cheap 'n' EZ..

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Old 12-08-2012, 12:40 PM
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Thanks guys. Do you have any recommendations on an affordable installlation tool?

Jegs sells a "starter kit" that has a tool and assortment of nuts for $90. I think the nuts are serrated aluminum, but they also sell steel nuts separately. *EDIT* This is a Marson Thread-Setter kit.

Storage Case
Rivet Nut Tool
Wrench
Instructions
Mandrel:
#6-32
#8-32
#10-24
#10-32
1/4"-20
5/16"-18
3/8"-16
Nosepiece:
#6-32
#8-32
#10-24
#10-32
Rivet Nuts:
(10) #6-32
(10) #8-32
(10) #10-24
(10) #10-32
(10) 1/4"-20
(6) 5/16"-18
(6) 3/8"-16

These are the nuts that it comes with:


But they also sell these steel nuts for $5 per 10pack (1/4-20)


*EDIT* Looks like Marson 39315 Thread-Setter kit comes with the ribbed steel nuts for roughly the same price.
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Last edited by TheBandit; 12-08-2012 at 01:33 PM.
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Old 12-08-2012, 03:38 PM
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I have used a lot of the rive nut studs from McMaster Carr. Part number 98075A147 for this type of stuff on my firewall. I like the studs because I can simply slide what ever I am mounting on the stud and it holds it while I thread the nut.
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Old 12-08-2012, 05:05 PM
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I like the crimp style insert nuts with the rib under the head. You have to have a notch tool to notch the hole before you install the crimp insert, but the rib keyed into the notch in the panel will keep it from spinning. The serated or knurled ones will spin eventually.
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Old 12-08-2012, 05:34 PM
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Where can I find a tool to do the notching for the key-style nuts? Are they size specific or do they accept different end effectors to do different sizes?
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Old 12-08-2012, 05:55 PM
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Quote:
Originally Posted by TheBandit View Post
Where can I find a tool to do the notching for the key-style nuts? Are they size specific or do they accept different end effectors to do different sizes?


I believe the notch tool is size spicific but the crimping tool has different sized mandrels, thread size spicific you can change out so you only have to buy one crimp tool, then the size of crimping mandrels you think you'll need. I believe I have one for a 10-32 insert but want to get a couple other sizes myself. I've never shopped for them though.

Years ago when I was 18 and started working for an aircraft seat manufacturer, there was a guy who would go to tool swapmeets and buy up all kinds of used aircraft tools of whatever he could find. Then sell the tools to us at work, thats how I got mine. So I've had my insert installation tools I have for like 27 years now. I think McMaster Carr or possibly Reid Supply carries these tools as well. USATCO sells them as well.


Here is the style I have. This is from USATCO.

http://www.usatco.com/CGI-BIN/LANSAW...4B3071+M37+ENG

http://www.usatco.com/category/M37/1/1/120/1

Their on monthly sale special right now too.

Here is the McMaster Carr style crimp tools:

http://www.mcmaster.com/#nut-insert-...-tools/=kia8gn

Hope this helps Clint.


Scroll down a bit and onthe right you'll see inserts with anti-rotation key is the type of inserts I like.

https://www.pegasusautoracing.com/2012/102.pdf

Last edited by rdn2blazer; 12-08-2012 at 06:05 PM.
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Old 12-08-2012, 06:09 PM
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Quote:
Originally Posted by cweed View Post
I have used a lot of the rive nut studs from McMaster Carr. Part number 98075A147 for this type of stuff on my firewall. I like the studs because I can simply slide what ever I am mounting on the stud and it holds it while I thread the nut.
Sounds like a good idea. What tool do you use to install those?
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Old 12-08-2012, 07:23 PM
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I dont even like to suggest this but H.F. has all you need for the nutsert and tool. I bought one years ago and finally wore it out. went on line and ordered a $85.00 U.S. made tool and it was made worse than the China Garbage. Ive been using the H.F. tool ever since. Good cheap starter tool if your only going to use it occasionally. I should note that I use better quality nut inserts than what came with the kit. They all work with this tool.

http://www.harborfreight.com/45-piec...-kit-1210.html

Last edited by METAL TWISTER; 12-08-2012 at 07:27 PM.
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  #14  
Old 12-08-2012, 09:00 PM
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Which US tool did you try?
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Old 12-08-2012, 09:23 PM
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Originally Posted by TheBandit View Post
Which US tool did you try?
Wish I could remember... thought Id order a good quality us made tool and remember thinking it would be worth it if the quality would hang in there... Not! The little dimple that puts pressure on the netsert to pull it tight just galled up and flattened out, Nothing left to grab for the leverage.

I cant remember if I bought it through Grainger, or McMaster? I'm sure it was one of their products but I honestly don't remember which. Getting old sucks!
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Old 12-09-2012, 12:59 AM
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The HF one looks a little on the thin side. Does it do okay with 1/4-20 steel nutserts?
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Old 12-09-2012, 01:18 AM
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Quote:
Originally Posted by METAL TWISTER View Post
Wish I could remember... thought Id order a good quality us made tool and remember thinking it would be worth it if the quality would hang in there... Not! The little dimple that puts pressure on the netsert to pull it tight just galled up and flattened out, Nothing left to grab for the leverage.

I cant remember if I bought it through Grainger, or McMaster? I'm sure it was one of their products but I honestly don't remember which. Getting old sucks!
Do you remember if it looked like the one at the top of this thread? That is a Marson Thread Setter which is US made. It's what I'm leaning toward at the moment. Costs around $80-90 as a kit with an assortment of ribbed rivet nuts.

*EDIT* did some reading and it lookse like they started making these in Taiwan after Alcoa bought them out. They're still considered to be a good tool, but I'm a little less excited to know that.
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Last edited by TheBandit; 12-09-2012 at 02:09 AM.
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Old 12-09-2012, 01:44 AM
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Found this related OFN thread.
http://www.offroadfabnet.com/forums/...ead.php?t=7407
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Old 12-09-2012, 01:35 PM
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Quote:
Originally Posted by TheBandit View Post
The HF one looks a little on the thin side. Does it do okay with 1/4-20 steel nutserts?
Wish I could be more exact in my recollection of the purchase. It was several years ago. The style of the us made one was the same basic style as the H.F. model. Ive been using the H.F. Model and I only use 1/4 20's. I buy them in bulk and they work fine. Seems the second Hf set that I bough has a wider sharper shoulder for the leverage grip.

I dug through the tool box last night and found the old US made one. No name on it, has black rubber handles cushions on it and a screw in depth adjustment about an 1 1/2" down the handle from the head that allows you to set how tight or close the two handles squeeze together. Exact same size and style of tool but in looking it over it has a bolt and nut holding it together at the pivot point making it look like a better quality tool where as the HF model is all riveted.

My memory card died on my camera or Id click a pic for ya. Seriously for the money buy the H.F. you wont be disappointed for the money. I wouldn't suggest any of their other tools though.
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Old 12-09-2012, 02:34 PM
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Thanks for the added info. I am very cautious buying HF stuff with moving parts, but it sounds like you like yours. Are those 1/4-20s you use steel or aluminum? Where do you buy them?
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