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23 rows torque tightening values for structural steel bolts. These metric bolt torque charts show the ideal tightening torque for class 8.8, 10.9, and 12.9 bolts for both wet and dry tightening. Bolt head/wrench size to bolt diameter conversion chart:
Bolt size tpi proof load (lbs) 1 clamp load (lbs) 2 tightening torque (ft lbs) galv+waxed galv plain; The data in the chart is measured under 60% yield limit of the bolt, the recommended tightening. Standard recommended torque spec for each size bolt:
The Charts Below Show The Ideal Tightening Torque For Each Bolt Grade For A Variety Of Sizes.
Bolt head/wrench size to bolt diameter conversion chart: Coefficient factor indicates bolt condition (k factor indicates dry, vs lubed, vs greased, etc), koken chart is based The bolt’s class indicates its material strength, with higher numbers meaning higher tensile and yield strength.
Maximum Tightening Torque For Coarce Threaded Metric Steel Bolts:
Tightening torque for metric bolts: Always refer to the manufacturers recommended torque values if possible. Bolt marking chart for sae and metric bolts.
Standard And Fine Pitch M6 <> M36.
T = k f i d ; Suggested starting torque values astm a307 bolt size 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1 1 1 1 1 2 2 2 2 3 3 3 3 4 Tightening torque (ft lbs) bolt size.
