"igor" wrote in message
...
When a company says that its clamp can extert X amount of force, what does
that mean? Before the clamp will snap? That a user will not be able to
tighten it any further?

Specifically I am interested in the specs on the "Quick-Grip One-Handed
Bar
Clamp / Spreader" shown he

http://www.coastaltool.com/cgi-bin/w..._bar_clamp.htm

It says that the clamp "Exerts up to 250 lbs of clamping pressure". I've
used this clamp and tightened it as best I could by hand, squeezing the
trigger. Assuming I have a "normal" strength grip, would that mean that
at
that point the clamp is exerting 250 pounds? What might the multiplier
be?
What if I used another clamp to squeeze the trigger of the first clamp?


Lots of replies, but the real answer is up to the point of clutch slip or
screw jamming.

The type referenced are used to hold things in place in lieu of a helper in
my shop. Though primarily "extra hand" devices, they can also be used
effectively as clamps, especially on properly prepared material.