Loosey Goosey : Tight Connections

Reply

  #1  
Old 05-02-17, 04:17 PM
P
Member
Thread Starter
Join Date: Jul 2009
Location: NYC
Posts: 302
Received 0 Votes on 0 Posts
Loosey Goosey : Tight Connections

just blurbing.....tonight, I just hand tight a 90 degree flat plate ontop of unistrut with a 3/8 ratchet. Just eyeballing what I would consider tight. Then I just put the socket on the torque wrench and gave it another quarter turn. The handle on my torque wrench is about 18-20 inches as a wild guesstimate.

Specs call for 50 ft lbs on a 1/2 nut , and what I thought was tight enough was reading 20 lbs on my CDI digital torque wrench...

Unless my torque wrench is way off calibration.....how tight is tight ~enough~ ;-)
Kinda interesting nothing what I perceived was tight was not even at half the recommended torque spec.
 
Sponsored Links
  #2  
Old 05-02-17, 05:17 PM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,119
Received 3 Votes on 3 Posts
I'm guessing the 3/8" ratchet is what threw you off. Way easier to get 50 ft/lbs with a 1/2" ratchet. It's basically a type of lever and doubling the length of the handle reduces the force needed by quite a bit.
 
  #3  
Old 05-02-17, 05:42 PM
P
Member
Thread Starter
Join Date: Jul 2009
Location: NYC
Posts: 302
Received 0 Votes on 0 Posts
I just repeated the test again. 1/2 ratchet. I have 1/4 and 3/8 digital torques but only 1/2 in clickers..
Due to the longer length on the torque, I snugged it a bit more but I swear, 20 seems to be my sweet spot before I feel like I should back off, just short of putting shearing forces on the bolt.

Then again, I'm putting a 1/2 bolt into a channel nut that is probably a smigen more than 1/4" thick.

When I use polaris connectors, I always use a torque on that.
Nary to nil on anything else in the electrical world...
What am I amiss. I doubled checked Unistruts catalog as that is where I got the torque spec info from, and indeed confirmed they are recommend 50 ft lbs.
 
  #4  
Old 05-03-17, 07:42 AM
B
Member
Join Date: Oct 2008
Posts: 1,312
Received 0 Votes on 0 Posts
I don't know what a "unistrut" is...

But if it is an electrical connection, the typical specifications for tightness for electrical connections are in INCH POUNDS... not foot pounds. And there are 12 inch pounds to one foot pound.
 
  #5  
Old 05-03-17, 12:54 PM
Gunguy45's Avatar
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,119
Received 3 Votes on 3 Posts
Bill... Unistrut is perforated steel channel for attaching cables or making exposed cable runs (and probably other stuff). Heavy strong stuff. Ft/Lbs is the correct measure for their connections.
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: