Blacks fasteners supply a range of nuts and bolts with different finishes including;
galvanised, stainless
Standard Bolt Product Range.pdf
Strength Grade Designations.pdf
Imperial Hexagon Bolts:Set Screws.pdf
Cup Head Square Neck Bolts.pdf
Metric 4.6 Tightening Torques.pdf
Metric 8.8 Tightening Torques.pdf
Metric 10.9 Tightening Torques.pdf
Hexagon Nuts and Hexagon Lock Nuts.pdf
Correct Use of Jam or Lock Nuts.pdf
Construction Lock Nuts DIN 980.pdf