Coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2 4 8 4 3.
													
																	1 4 bolt torque value. 
								
	
		
	
																	F t k d 1 l 100 1a example dry vs. 
																	Values calculated using industry accepted formula t kdp where t torque k torque coefficient dimensionless d nominal diameter inches p bolt clamp load lb. 
																	In addition a proper bolt torque value can be inconsistent from fastener to fastener due to several factors including variations in material coatings surface finishes fit tolerances installation method etc. 
																	1 can be rearranged to express bolt force as. 
															
													
								
	
		
	
																	Pressure wax as supplied on high strength nuts 10 hot dip galvanized 25 and plain non plated bolts as received 20. 
																	Grade 2 grade 5 grade 8 18 8 s s bronze brass. 
																	For these reasons it is not practical to provide a single bolt torque chart or formula that is accurate for all situations. 
																	The proof load for a m30 metric bolt grad 8 8 is 337000 n.