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Stop nuts one terminal studs?

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Thu Aug 11, 2011 1:26 pm Post subject: Stop nuts one terminal studs?

Dan, If your metric contactor studs are 6mm X 1.0, the 21042-4 will go right on. I use them on Rotax vibration dampers to mount the radiator on my plane and they work just fine.



FWIW,

Rick Girard

  

On Thu, Aug 11, 2011 at 12:56 PM, messydeer <messydeer(at)yahoo.com (messydeer(at)yahoo.com)> wrote:

 	  Quote: 	
		    --> AeroElectric-List message posted by: "messydeer" <messydeer(at)yahoo.com (messydeer(at)yahoo.com)>

 

 Hi!

 

 I have a 3/16 to 1/4" studs on my battery, battery contactor, starter contactor and ground posts. Some came with simple jam-type nuts with a split ring washer. What type of nuts and washers should I use FWF? I've got MS21042-3 and -4 that would work for some. Others are metric and wold need a separate lock washer of sorts.

   

 Thanks!

 

 --------

 Dan

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=349196#349196

 

 

 

 

 

 

 

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messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Mon Aug 22, 2011 6:01 am Post subject: Re: Stop nuts one terminal studs?

 	  Quote: 	
		  Dan, If your metric contactor studs are 6mm X 1.0, the 21042-4 will go right on. 	




Thanks, Rick!



I do have some metric studs, come to think of it. Think it's the battery contactor, not sure about the starter. Battery itself, too, I think. 



Another thought is how much torque to put on these. I suppose I otta look that info up from the contatctor specs. If the studs are embedded in plastic, seems the 50-70 in-lbs could damage it.



And sorry about the late response. Since your post wasn't a reply to mine, I didn't get an email. 



Dan

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Aug 22, 2011 7:36 am Post subject: Stop nuts one terminal studs?

 	  Quote: 	
		  



Another thought is how much torque to put on these. I suppose I otta 

look that info up from the contatctor specs. If the studs are 

embedded in plastic, seems the 50-70 in-lbs could damage it.


	


    These are generally hard copper or brass studs.

    I don't think you're going to find anyone offering

    recommended torque values. Us internal tooth lockwashwers

    under the nuts and snug 'em up.



   Bob . . .

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dsleepy47

Joined: 15 Dec 2007
Posts: 41

Posted: Mon Aug 22, 2011 8:24 am Post subject: Stop nuts one terminal studs?

> Date: Mon, 22 Aug 2011 10:32:23 -0500

 	  Quote: 	
		   To: aeroelectric-list(at)matronics.com

 From: nuckolls.bob(at)aeroelectric.com

 Subject: Re: Re: Stop nuts one terminal studs?

 

 --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>

 

 

 >

 >

 >Another thought is how much torque to put on these. I suppose I otta 

 >look that info up from the contatctor specs. If the studs are 

 >embedded in plastic, seems the 50-70 in-lbs could damage it.

 

     These are generally hard copper or brass studs.

     I don't think you're going to find anyone offering

     recommended torque values. Us internal tooth lockwashwers

     under the nuts and snug 'em up.

 

    Bob . . .


	




 I don't know about other manufacturers but these : http://www.trombetta.com/dc-contactor-products.cfm?id=51 have the torque values on the label. You can open the drawing and zoom in on the label. 

Deems

 		 	   		  

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dsleepy47
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racerjerry

Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY

Posted: Tue Aug 23, 2011 6:12 am Post subject: Re: Stop nuts one terminal studs?

As a licensed A&P mechanic, I shudder to think of what the repercussions would be if I were to advocate the mixing of AN standard and metric hardware and something went wrong.  Please listen carefully to Bob and use an internal star lockwasher under the metric nut.  It is a RARE day indeed when Bob will steer you wrong.



The more educated and experienced of us must teach our students the correct way â€“ not what we can get away with.  They will learn that all too easily on their own.  Hopefully, no one will be killed in the process.

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Jerry King

messydeer

Joined: 13 Feb 2006
Posts: 214
Location: Bellingham, WA

Posted: Tue Aug 23, 2011 7:46 am Post subject: Re: Stop nuts one terminal studs?

Thanks for the feedback, guys.



I was able to find the info for Odyssey battery,  M6 40 in-lbs, and the EV200 battery contactor, M8 x 1.25 80-100 in-lbs. I'll use internal star washers and torque to these values.



I couldn't find any info on the Jabiru starter contactor. The posts are the color of a shiny penny and about 5/16" diameter. Threads look coarse, but didn't fit a 5/16-18 bolt. The stackup order on each post from the bottom up is internal star washer, nut, another internal star washer and another nut. The bottom nuts were already torqued pretty tight. 



I've done one starter contactor terminal, placing the ring over lower nut and tightening the top nut with star washer. Used a wrench to hold the lower nut while I tightened the upper one. Not sure how much torque there was on it, but the first go wasn't tight enough. During tightening, the cable lug rotated, so I pushed the cable  back into place, which caused the top nut to loosen. After tightening a bit more, the top and bottom nuts rotate on the post as a unit when I push on the cable, but it takes a lot more force than before. I'm essentially using the cable as a lever, like a wrench, since the nuts and lug rotate as a unit.  I'd be happy to call this good.

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Dan

BobsV35B(at)aol.com
Guest

Posted: Tue Aug 23, 2011 9:45 am Post subject: Stop nuts one terminal studs?

Good Afternoon Dan, 

  

 I am confident you will do this, but may I mention that it is excellent  practice to place an Adel clamp in a strategic location which  will make the wire not work as a wrench?

  

 Happy Skies,

  

 Old Bob

  

  In a message dated 8/23/2011 10:51:08 A.M. Central Daylight Time,  messydeer(at)yahoo.com writes:

  	  Quote: 	
		  -->    AeroElectric-List message posted by: "messydeer"    <messydeer(at)yahoo.com>



Thanks for the feedback, guys.



I was    able to find the info for Odyssey battery,  M6 40 in-lbs, and the EV200    battery contactor, M8 x 1.25 80-100 in-lbs. I'll use internal star washers and    torque to these values.



I couldn't find any info on the Jabiru starter    contactor. The posts are the color of a shiny penny and about 5/16" diameter.    Threads look coarse, but didn't fit a 5/16-18 bolt. The stackup order on each    post from the bottom up is internal star washer, nut, another internal star    washer and another nut. The bottom nuts were already torqued pretty tight.    



I've done one starter contactor terminal, placing the ring over lower    nut and tightening the top nut with star washer. Used a wrench to hold the    lower nut while I tightened the upper one. Not sure how much torque there was    on it, but the first go wasn't tight enough. During tightening, the cable lug    rotated, so I pushed the cable  back into place, which caused the top nut    to loosen. After tightening a bit more, the top and bottom nuts rotate on the    post as a unit when I push on the cable, but it takes a lot more force than    before. I'm essentially using the cable as a lever, like a wrench, since the    nuts and lug rotate as a unit.  I'd be happy to call this    good.



--------

Dan



	


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