What is snug tight torque?
Snug tight is defined by the AISC/RCSC as when all the plies in a connection have been pulled into firm contact by the bolts in the joint, and the bolts have been tightened sufficiently to prevent removal of the nuts without a wrench.
How many foot pounds is snug tight?
Snug tight generally considered to be around 150 Ft-K LB (see my post below) but it could vary a bit because snug tight means full contact between the plies.
Can I torque without a torque wrench?
RE: How to measure bolt torque without a torque wrench The turn-of-the-nut method is generally recognized as a better method of preload control then torque. So, no need to involve torque in the process at all.
How much torque can a 1/2 drive take?
If you assume a reasonable quality tool steel that can handle 100K psi, a 1/4″ drive can take about 30 ft-lb, 3/8″ about 100 ft-lbs, 1/2″ about 230 ft-lbs, and 3/4″ about 800 ft-lbs.
What happens if you over torque?
The Importance of Proper Torque Typically, an under torqued bolt will deform and be unable to provide as much clamping force as needed. An over torqued bolt will break.
What is the tension in a bolt when ” snug tight “?
The RCSC Specification for Structural Joints Using ASTM A325 or A490 Bolts, Section 8.1 defines snug tight as follows: “The snug-tightened condition is the tightness that is attained with a few impacts of an impact wrench or the full effort of an ironworker using an ordinary spud wrench to bring the connected plies into firm contact.”
What’s the difference between low end and high end torque?
On the low end you’re looking at 133 ft-lbs and at the high end you have 225 ft-lbs of torque. The translation of torque to tension varies widely (surprise surprise) with bolt lubrication, thread type and condition, bolt diameter, bolt length and fastener part (bolt and nut) lot. Hope this helps.
What does it mean when a wrench is snug?
The snug condition was defined as the point at which the wrench started to impact. This occurred when the turning of the nut was resisted by friction between the face of the nut and the surface of the steel.
How is the tightening torque related to the clamping force?
Consequently the value of the clamping force is usually referred to as the tightening torque. As the clamping force is a linear function of both the turning angle of the screw and the pitch of the thread, there is a direct relation between the clamping force and the tightening torque within the elastic range of the screw elongation.