Bolt Torque Table

Fasteners bolts nuts and threaded rods torque tension and loads.

Bolt torque table. Relative strength marking 4 6 4 8 8 8 or 9 8 10 9 12 9 bolt markings dia. Accepted formulae relating torque and tension based on many tests are m p x d 60 or for metric sizes m p x d 5000 these formulae may be used for bolts outside the range of the tables m torque lbf ft p bolt tension lbf d bolt dia ins m torque n m p bolt tension newtons d bolt dia mm force flow lbf x 4 45 n l s x 2 119 cu ft min. Bolt tightening sequence or torque sequence is defined in torque tightening procedure. Surface condition of bolt self zinc cadmium phosphate.

Coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2 4 8 4 3. Improvised torque wrench improvised torque wrench with luggage scale. Grade 2 grade 5 grade 8 18 8 s s bronze brass. Bolting torque to develop 50 bolt yield stress at nut factor k 0 16 this table is applicable to never seize paste and fel pro lubricant k 0 16.

Iso 724 metric threads dimensions of metric threads according iso 724. Values calculated using industry accepted formula t kdp where t torque k torque coefficient dimensionless d nominal diameter inches p bolt clamp load lb. Pressure wax as supplied on high strength nuts 10 hot dip galvanized 25 and plain non plated bolts as received 20. If lubrication has been applied to the bolt and or the nut other than the normal protective oil film multiply the recommended torque by the appropriate factor shown in the table.

This is the most widely used method. Required torque torque recommended x 0 75. Various tightening methods tightening method description advantages and disadvantages torque control method bolt tightening is controlled by specific torque value. Bolt torque calculator calculate required bolt torque.

Tightening torque is not influenced by the bolt length so easy to standardize. Lubricated bolts and reduced torque lubrication effect on bolt tension and torque. It is reasonable way for tightening control and operation. The above table is applicable only for astm a320 grade b8 class 2 and a193 grade b8 class 2 stud bolts.

Flange bolt torque sequence and torque table a complete bolt tightening procedure flange joints require proper tightening to avoid the leak of the fluid from the joint.