Hex Headed Bolts as against Setscrews are not fully threaded. The rule of thumb is the threaded part is twice the diameter of the bolt plus 6mm, up to 150mm in length Measure the length from bottom of head to base. The diameter is the thickness of the thread Not the size of the head. All Hex bolts in this section are bright zinc plated and high tensile grade 8.8
Code:"M12 x 40 Hex Head Bolts High Tensile Grade 8.8 DIN931 BZP Pack 100"