3 4 Bolt Torque Chart

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3 4 bolt torque chart.

Us recommended bolt torque. Sae grade 3 100 000 psi med carbon steel. Clamp load calculated as 75 of the proof load when specified by the standard. Torque tension reference guide printed in u s a.

Clamp loads for grade c lock nuts equal 75 of the bolt proof loads specified for sae j 429 grade 8 and astm a 354 grade bd bolts. Shop for us hex bolts. Torque tension relationship for a307a grade 5 8 9 bolts locknut size threads per inch steel hex locknut steel hex flange nut. Sae grade 5 120 000 psi med.

Torque values for 1 4 and 5 16 in series are in inch pounds. Grade 2 5 and 8 values are for slightly lubricated bolts. Torque values for 1 4 and 5 16 sizes are in inch lb. The research council on structural connections is a non profit volunteer organization whose research projects serve to provide safety.

Most bolt torque charts including this one are based on the material strength of the bolt the component containing the external thread. Astm a307 utilized 75 of 36 000 psi. If you are working with a325 structural bolts on a regular basis we strongly recommend purchasing a copy of the astm a325 specification from astm international. The torque values can only be achieved if nut or tapped hole has a proof load greater than or equal to the bolt s minimum ultimate tensile strength.

9702365 as 06 14 torque poster. For longer fasteners the torque is reduced significantly. 3 4 10 9030 85 96 113 21322 160 200 227 267 30101 226 282 320 376 35281 265 331 375 441. 3 sockethead coarse thread bolt size pitch lubricated with anti seize in lbs nm in lbs nm 1 4 20 150 17 100 11 ft lbs nm ft lbs nm 5 16 18 26 35 18 24.

Grade 2 calculations only cover fasteners 1 4 3 4 in diameter up to 6 long. Sae 0 1 2 74 000 psi low carbon steel. Reference 2 below recommends a fastener preload in the range of 60 90 of the bolt material proof load. Asme b18 2 6 covers dimensional standards for a325 heavy hex structural bolts rcsc.

Print this page. The values shown in the chart are to be used as a mid range guideline. Grade 2 grade 5 grade 8 18 8 s s bronze brass. Clamp loads are based on 75 of the minimum proof loads for each grade and size.

Ifi 100 does not govern lock nuts above 1.