En15048 is European Standard specifies the general requirements for the components of bolt/nut/washer assemblies for non-preloaded structural bolting and for the assemblies themselves. It applies to bolts (including screws, studs and stud bolts) and nuts made of carbon steel, alloy steel and stainless steel with the following property classes: AGICO supplies alloy steel hex head bolt with high strength levels,8.8, 10.9, 12.9,etc, nuts 8,10, 12. washers according to hardness class HV 100 or HV 200.
General Mechanical Characteristics of Hex Bolts
| Mechanical characteristic | Relevant standard for property class |
| carbon steel and alloy steel 8.8, 10.9 | |
| Elongation after fracture | EN ISO 898-1 |
| Minimum tensile strength | EN ISO 898-1 |
| Lower yield strength or Stress at 0,2 % non-proportional elongation | EN ISO 898-1 |
| Stress under proof load | EN ISO 898-1 |
| Strength under wedge loading | EN ISO 898-1 |
| Hardness | EN ISO 898-1 |
Minimum Impact Strength of Hex Bolts
| Characteristic | For property classes | |
| carbon steel Characteristic and alloy steel | ||
| 4.6, 5.6, 8.8, 10.9 | 4.8, 5.8, 6.8 | |
| Impact strength KV,min at – 20 °C | 27 J | – |
| Impact strength KV,min at + 20 °C | – | 27 J |
Hex Nuts
| Mechanical characteristic | Relevant standard for property class |
| carbon steel and alloy steel 4, 5, 6, 8, 10, 12 | |
| Stress under proof load | EN 20898-2 |
| Hardness | EN 20898-2 |
Washers
| Mechanical characteristic | For all carbon steel, alloy steel and stainless steel bolt property classes | For property classes 8.8 and 10.9 in a single lap joint according to EN 1993-1-8:2005, 3.6.1 |
| Hardness | minimum 100 HV | 300 HV to 370 HV |
Appropriate Combinations of Bolts, Nuts and Washers
| Assemblies made of carbon steel or alloy steel | ||
| Bolts | Nuts | Washers |
| Property class | Property class | Hardness |
| 8.8 | 8 or 10 | 100 HV min. or 300 HV min. a |
| 10.9 | 10 or 12 | |
Tensile Resistance of Bolt/nut Assemblies Made of Carbon and Alloy Steel
| Thread | Nominal stress area As, nom mm2 | Property class 8.8 , 10.9 | Minimum tensile resistance in N |
| M30 | 561 | 466000 | 583000 |
| M33 | 694 | 576000 | 722000 |
| M36 | 817 | 678000 | 850000 |
