Bolt Torque value designed according to AISC Design guide Chapter 4, Section 4.3 (Second Edition 2001)
Note:
Tightening tools shall be calibrated by using Skid more tension calibrator on daily basis for all size bolts.
A Minimum of 3 bolts of each diameter must be tightened at least once each working day in a calibrating device capable of indicating actual bolt pretension.
The average bolt pretension variation is ±10% in general (This variance due to thread conditions, surface conditions under the nut and lubrication).
The impact wrench should be calibrated a minimum of 5% greater than the required bolt pretension.
After torquing, the bolt tip should be marked.
Note:
Tightening tools shall be calibrated by using Skid more tension calibrator on daily basis for all size bolts.
A Minimum of 3 bolts of each diameter must be tightened at least once each working day in a calibrating device capable of indicating actual bolt pretension.
The average bolt pretension variation is ±10% in general (This variance due to thread conditions, surface conditions under the nut and lubrication).
The impact wrench should be calibrated a minimum of 5% greater than the required bolt pretension.
After torquing, the bolt tip should be marked.
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