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A chart of Metric Thread Pitches for bolts, studs and other fasteners covering from M1 to M100. Diameter Coarse Pitch M11 0.25 M22 0.4 M33 0.5 M4 0.7 M5 0.8 M6 M7 1 M8 M9 1.25 M10 M11 1.5 Diameter Coarse Pitch M12 1.75 M14 M16 2 M18 M20 M22 2.5 M24 M27 3 M30 M33 3.5 M36 4 Diameter Coarse Pitch M39 3 M42 M45 4.5 M48 M52 5 M56
Read more about Metric Thread Pitch Chart - Coarse Pitch ↬

It is the requirement that the manufacturer of the EN 14399 assembly will supply them suitably lubricated. The lubrication can be applied either on the bolt thread (external) or the nut thread (internal). Andrews Fasteners, in a majority of cases, choose to apply lubrication on the internal thread of the nuts. Due to the method used to lubricate the nuts, typically they need to be immersed in lubricant in full. Depending on the type of process used, the appearance of the nuts can differ, especially on Hot Dip Galvanised (HDG) nuts.
Read more about The different appearance of lubricated nuts on EN 14399 assemblies ↬

We understand the difficulties by the end-users and purchasing departments in choosing the right components for different installation methods of High-strength structural bolting assemblies for preloading (HR) . Different installation methods and product grades may require additional components like DTI washers , hardened washers, bolt face or nut face washers. Sometimes, the number and type of component change, depending on which part is rotated (the nut or the bolt head).
Read more about BS EN 14399 High-Strength Structural Bolting Assemblies for Preload Configurator (HR) ↬

Internal thread diameter* d Pitch of thread P External diameter, shank diameter D Nominal length m (ref.) Minimum tensile strength** kN M12 2 M20 100 70 M16 2 M24 100 130 M20 2.5 M30 100 203 M22 2.5 M33 100 252 M24 3 M36 100 293 M27 3 M39 100 381 M30 3.5 M42 100, 120 466 M33 3.5 M45 100, 120 576 M36 4 M48 100, 120 or 150 678 Dimensions in millimetres *) Internal thread class 6H (to suite bolts with thread class 6g) for use with bolts, studs or square square holding down bolts bolts (BS 7419).
Read more about Bolt Extenders – General specification (coarse thread) ↬

High-strength structural bolting assemblies for preloading with specified k-Class shall be tightened using below methods (See BS EN 1090-2:2008+A1:2011, Table 20 for more details). Method k-Class Torque method K2 Combined method (torque / part-turn) K2 or K1 Direct Tension Indicators (DTI) K2, K1 or K0 k-Class K2 using Torque Method Torque method uses a torque wrench in two steps of assembling. km figure is required for calculating first tightening torque value and Vk is required for calculating final tightening torque.
Read more about Torque values for High-Strength Structural Bolting Assemblies for Preloading with specified k-Class ↬

Andrews Fasteners Bolt Length Calculator for BS EN 14399 High-strength structural bolting assemblies for preloading (HR) HR Bolt to EN 14399-3:2015 / HR Countersunk bolt EN 14399-7:2018 This calculator is for guidance only and is used for calculating the minimum recommended bolt length based on maximum allowed thickness of the assembly components and the steelwork. This information is provided in good faith and is for your guidance only. Andrews Fasteners Limited can not accept any liability for actions taken by third parties based on this information.
Read more about Bolt Length Calculator for HR Bolts and HR Countersunk Bolts (EN 14399-3/7) ↬

Maximum bolt length = 300 mm The values produced on this calculator are for information purpose only. They are calculated using formulas stated in relevant standard and are provided in good faith and for your guidance only. Andrews Fasteners Limited can not accept any liability for actions taken by third parties based on this information. Bolt diameter M Length X Calculate Reset form Thread b (ref.): Minimum thread (full thread): Maximum thread inc.
Read more about Thread Length Calculator for Countersunk High-Strength Structural Bolts to BS EN 14399-7 (HR CSK) ↬

Maximum bolt length = 300 mm The values produced on this calculator are for information purposes only. They are calculated using formulas stated in the relevant standards and are provided in good faith and for guidance only. Andrews Fasteners Limited can not accept any liability for actions taken by third parties based on this informations. Bolt diameter M Length X Calculate Reset form Thread b (ref.): Minimum thread (full thread): Maximum thread inc.
Read more about Thread Length Calculator for Hexagon High-Strength Structural Bolts to BS EN 14399-3 (HR) ↬