entropy
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Posts: 8671
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posted September 08, 2009 10:24 AM
radiator clamps: how tight is too tight?
seems like a stupid question, but ever since i went to the emergency room a few years back with 3rd degree burns from a hose I forgot to tighten properly, I am gun shy.
I'm pretty damn sure i over tighten them.
Any tips?
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tcchin
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posted September 08, 2009 11:19 AM
McMaster-Carr provides torque specs for the clamps they sell. If you get the solid band style, there's less chance that you'll slice-up the hose with the clamp.
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dougmeyer
Needs a job
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posted September 08, 2009 11:55 AM
Nearly EVERYBODY overtightens them. But first, make sure you have "good" ones. I especially like the metric clamps that have the threads stamped into the band rather than the slotted ones you usually see. ("solid band"?)
Most of these have a W-1 stamped on the screw housing and a size stamped into the band. It's almost impossible to strip these. I like the US made Norton clamps also, as they have a positive wrap around the band under the screw housing that can't come loose as long as the clamp is tight. Some of the cheaper ones are spot welded to the band and they can break loose.
As far as tightening any of these, as long as you are putting the hose over a beaded tube, it will not slide or blow off if the clamp is tight enough to deform the rubber to to the point that it goes anywhere near solid. As Tim points out, they all have an lb/in torque spec, but I don't know what it is because I don't use it. I have to trust my feel because I don't have any way to measure that light of a torque. It's got to be less than 10 lb/in.
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tcchin
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posted September 08, 2009 12:23 PM
McMaster spec for the German-made Gemi stainless steel, smooth-band hose clamps (http://www.mcmaster.com/#5076k16/=3jnm32) is 20 in-lbs.
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Texas12R
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posted September 08, 2009 04:35 PM
Karl do you have a screwdriver that measures
inch/ pounds?
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dougmeyer
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posted September 08, 2009 06:30 PM
Wow, that's a lot. Are hose the ones with the stamped raised threads?
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tcchin
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posted September 08, 2009 06:42 PM
Yup. My favorite style and brand. Here's a link with the manufacturer's own specs and torque data. If you thought 20 in-lbs was a lot... http://www.hweckhardt.com/clamps/ABA_9mmGemi.pdf
See http://www.mcmaster.com/#torque-drivers/=3jshtp for torque-adjustable screwdrivers.
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entropy
Moderator
Posts: 8671
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posted September 09, 2009 02:21 AM
Thanks, Tim & Doug!
I will stock up on clamps, but a $112 tq screwdriver would cut into my Bud Light budget 
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Texas12R
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posted September 09, 2009 10:41 AM
Well I re- read the above and see that you
don't
I've got one your welcome to have as I've
used 0 times after leaving aerospace
it's a 2-50 inch/ pound 1/4 drive
email
no1welder@charter.net
as I don't have your mailing address Karl
Michael
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Texas12R
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posted September 09, 2009 03:19 PM
 Edited By: Texas12R on 9 Sep 2009 23:24
Micro- torque is the brand
it was good enough for quality control
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KZScott
Needs a life
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posted September 09, 2009 04:23 PM
wow, i wasnt even aware those existed....
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dougmeyer
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posted September 09, 2009 06:25 PM
KZ -
Pretty much everything you can think of exists and was probably invented 30 years ago.
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tcchin
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posted September 09, 2009 06:30 PM
...or 70 years ago by the Nazis.
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dougmeyer
Needs a job
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posted September 09, 2009 08:55 PM
Heh, Heh.... Too true.
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entropy
Moderator
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posted September 10, 2009 12:56 AM
quote:
Well I re- read the above and see that you
don't
I've got one your welcome to have as I've
used 0 times after leaving aerospace
it's a 2-50 inch/ pound 1/4 drive
email
no1welder@charter.net
as I don't have your mailing address Karl
Michael
Michael,
You are W-A-Y too generous!!!! 
If you need anything for yr 12, i have lotsa stuff in my garage, just say the word
email on the way
Thanks again!!
Karl
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