Bolts, Screws and Nuts
EN 1515-4 is applicable for the selection of screws and nuts for flange connections on devices subject to the Pressure Equipment Directive 2014/68/EU.
EN 1515-4 specifies standards and additional requirements for dimensions, material properties and technical delivery conditions for screws and nuts.
NOTE 1 : Washers are not within the scope of this document.
The selection is based on commonly used screws and nuts. It covers common temperature ranges for general flange operation.
When selecting bolts and nuts according to this document, it is essential to consider environmental conditions and other parameters including type of fluids, corrosion hazards, acidic operating environments, brittle fracture at low temperatures and relaxation at elevated temperatures.
The purpose of this document is to provide a selection of the most common types and material combinations of screws and nuts.
It is not intended to define all possible applications, but rather to provide guidance for the most common applications. For example, the application limits of materials in the creep range are not explicitly discussed in this document. If mechanical properties for the creep range are provided in a material standard, reference will be made accordingly in Table 3.
NOTE 2 : Special operating areas and environmental conditions may require the application of coatings. The decision in this regard lies with the purchaser. Depending on the coating used, a review of the temperature ranges shown in Table 3 and Table 4 may be necessary.
NOTE 3 : Annex B contains types and material combinations of bolts and nuts according to common national standards not listed in Table 2, Table 3 and Table 4.
| Symbol | Designation | Unit |
|---|---|---|
| KV | impact work | J |
| TKV | Test temperature of the notched-bar impact test | °C |
| TM | Lowest material temperature of the connecting element | °C |
| strength class | Size boundary | Tensile strenght Rm MPa | Minimum yield strength Rp0.2/t(MPa) at one temperature(°C) from: | ||||
|---|---|---|---|---|---|---|---|
| 20 | 100 | 200 | 300 | 400 | |||
| 5.6 | 0 | 500 | 300 | 270 | 229 | 192 | – |
| 8.8 | 0 | 800 | 640 | 590 | 540 | 480 | – |
| A2-50 to A5-50 | 0 | 500 | 210 | 175 | 155 | 135 | 125 |
| A2–70 to A5–70 | 0 | 700 | 450 | 380 | 360 | 335 | 315 |
| European standard | Material type | Thickness limit tongue | Impact test forTM ≥ -10°C | Test temperature / Value |
|---|---|---|---|---|
| EN 10269:2013 | all Types of steel | after EN 10269:2013 | according to EN 10269:2013, Table 4 | after EN 10269:2013, Table 4 |
| EN ISO 898-1:2013 | 5.6 | M - 39 | M - 16 | RTa/40 y |
| 8.8 | M - 39 | M - 16 | RTa/52 y | |
| EN ISO 898-2:2012 | 5 | M - 39 | none | – |
| 8th | M - 39 | none | – |
| Material type | Thickness limitation | Impact test (Notched impact work of at least 40 years) | TM |
|---|---|---|---|
| 1.4307, 1.4301, 1.4303, 1.4404, 1.4401, 1.4948, 1.4919, 1.4941 | according to EN 10269:2013, table 10 | according to EN 10269:2013, table 4 | - 196°C |
| 1.4429, 1.4910, 1.4980 | according to EN 10269:2013, table 10 | according to EN 10269:2013, table 4 | - 273°C |
| 1.5525, 1.1133 | according to EN 10269:2013, table 10 | according to EN 10269:2013, table 10 | - 20°C |
| 1.7218 | d≤60mm | according to EN 10269:2013, table 10 | - 60°C |
| 60mm <d≤100mm | - 50°C | ||
| 1.6582, 1.6580, 1.7225 | according to EN 10269:2013, table 10 | according to EN 10269:2013, table 10 | - 40°C |
| 1.568 | d≤40mm | according to EN 10269:2013, table 10 | - 120°C |
| 40mm <d≤75mm | - 90°C | ||
| 1.5662 | according to EN 10269:2013, table 10 | according to EN 10269:2013, table 10 | - 196°C |
| standard | Material type | Thickness limitation | TM | impact attempt | |
|---|---|---|---|---|---|
| EN ISO 3506-1:2020 | A2, A3 | 50 | M - 39 | - 200°C | none |
| 70 | M - 24 | ||||
| A4, A5 | 50 | M - 39 | - 60°Ca | ||
| 70 | M - 24 | ||||
| EN ISO 3506-2:2020 | A2, A3, A4, A5 | 50 | M - 39 | - 200°C | |
| 70 | M - 24 | ||||
| Line No. | PM Class until | More suitable Temperature- area °C | Type of screws and nuts and description of the material groups | Name of the steel Material number of the steel Material standard | ||
|---|---|---|---|---|---|---|
| screws | Nuts | screws | Nuts | |||
| 1 | all | - 10 to 400 | 0.25C-1Cr-Mo | unalloyed steel high temperature | 25CrMo4 1.7218 EN 10269:2013 |
C35E 1.1181 EN 10269:2013 |
| 2 | all | - 10 to 350 | 0.42C-1Cr-Mo | unalloyed steel high temperature | 42CrMo4 1.7225 EN 10269:2013 |
C45E 1.1191 EN 10269:2013 |
| 3 | all | - 60 to 500 | 0.25C-1Cr-Mo | 0.25C-1Cr-Mo | 25CrMo4e 1.7218 EN 10269:2013 |
25CrMo4 1.7218 EN 10269:2013 |
| 4 | all | - 40 to 500 | 0.25C-1Cr-Mo | 0.42C-1Cr-Mo | 25CrMo4e 1.7218 EN 10269:2013 |
42CrMo4 1.7225 EN 10269:2013 |
| 5 | all | - 40 to 500 | 0.42C-1Cr-Mo | 0.42C-1Cr-Mo | 42CrMo4 1.7225 EN 10269:2013 |
42CrMo4 1.7225 EN 10269:2013 |
| 6 | all | - 10 to 500 | 0.42C-1.3Cr-0.6Mo | 0.42C-1Cr-Mo | 42CrMo5–6e 1.7233 EN 10269:2013 |
42CrMo4 1.7225 EN 10269:2013 |
| 7 | all | - 10 to 500 | 0.40C-1Cr-0.6Mo-V | 0.42C-1Cr-Mo | 40CrMoV4–6e 1.7711 EN 10269:2013 |
42CrMo4 1.7225 EN 10269:2013 |
| 8 | allc | - 10 to 500 | 0.21C-1.3Cr-0.7Mo- v | 0.21C-1.3Cr-0.7Mo-V | 21CrMoV5-7e 1.7709 EN 10269:2013 |
21CrMoV5–7 1.7709 EN 10269:2013 |
| 9 | all | - 10 to 500 | 0.2C-1Cr-1Mo-V-Tib | 0.2C-1Cr-1Mo-V-Ti-B | 20CrMoVTiB4-10e 1.7729 EN 10269:2013 |
20CrMoVTiB4-10 1.7729 EN 10269:2013 |
| 10 | allb | - 60f to 650 | 25Ni-15Cr-0.2Ti- Mo-VB | 25Ni-15Cr-0.2Ti- Mo-VB | X6NiCrTiMoVBe 25-15-2 1.4980 EN 10269:2013 |
X6NiCrTiMoVB 25-15-2 1.4980 EN 10269:2013 |
| 11 | allb | - 10 to 500 | 12Cr-1Mo-V | 12Cr-1Mo-V | X22CrMoV12–1 QT2e 1.4923 EN 10269:2013 |
X22CrMoV12–1 QT2 1.4923 EN 10269:2013 |
| 12 | all | - 10 to 650 | 16Cr-16Ni-Mo-BNb | 16Cr-16Ni-Mo-B-Nb | X7CrNiMoBNb16– 16e 1.4986 EN 10269:2013 |
X7CrNiMoBNb16- 16 1.4986 EN 10269:2013 |
| 13 | PN40c Cl. 300 | - 196 to 550 | 17Cr-12Ni-2Mo | 17Cr-12Ni-2Mo | X5CrNiMo17–12–2 + AT 1.4401 EN 10269:2013 |
X5CrNiMo17–12–2 1.4401 EN 10269:2013 |
| 14 | PN100 Cl. 600 | - 196 to 200a | 17Cr-12Ni-2Mo + AT+C | 17Cr-12Ni-2Mo | X5CrNiMo17–12–2 + AT+C700 1.4401 EN 10269:2013 |
X5CrNiMo17–12–2 1.4401 EN 10269:2013 |
| 15 | PN40c Cl. 300 | - 196 to 550 | 18Cr-10Ni | 18Cr-10Ni | X5CrNi18-10 + AT 1.4301 EN 10269:2013 |
X5CrNi18-10 1.4301 EN 10269:2013 |
| 16 | PN100 Cl. 600 | - 60dup to 200a | 18Cr-10Ni AT+C | 18Cr-10Ni | X5CrNi18-10 + AT+C700 1.4301 EN 10269:2013 |
X5CrNi18-10 1.4301 EN 10269:2013 |
| Sr. No. | PN Class until | More suitable Tempera- door area °C | Type of screws and Nuts as well description of Material groups | Strength class Material standard | ||
|---|---|---|---|---|---|---|
| screws | Nuts | screws | Nuts | |||
| 1 | PN40a Cl. 300 | - 10 to 300f | unalloyed steel | Carbon-steel | 5.6 – EN ISO 898-1:2013 | 5b – EN ISO 898-2:2012 |
| 2 | PN40a Cl. 300 | - 10 to 300f | alloyed steel | Carbon-steel | 8.8 – EN ISO 898-1:2013 | 8th – EN ISO 898-2:2012 |
| 3 | PN40c Cl. 300 | - 200 to 400 | 18Cr-9Ni | 18Cr-9Ni | A2-50 – EN ISO 3506-1:2020 | A2-50, A2-70e – EN ISO 3506-2:2020 |
| 4 | PN100 Cl. 600 | - 200 to 400 | 18Cr-9Ni | 18Cr-9Ni | A2-70 – EN ISO 3506-1:2020 | A2-70 – EN ISO 3506-2:2020 |
| 5 | PN40c Cl. 300 | - 200 to 400 | 18Cr-9NiG | 18Cr-9Ni | A3-50 – EN ISO 3506-1:2020 | A2-50, A2-70 – EN ISO 3506-2:2020 |
| 6 | PN100 Cl. 300 | - 200 to 400 | 18Cr-9NiG | 18Cr-9Ni | A3-70 – EN ISO 3506-1:2020 | A2-70 – EN ISO 3506-2:2020 |
| 7 | PN40c Cl. 300 | - 60d to 400 | 18Cr-9Ni-Mo | 18Cr-9Ni-Mo | A4-50 – EN ISO 3506-1:2020 | A4-50 A4-70e – EN ISO 3506-2:2020 |
| 8th | PN100 Cl. 600 | - 60d to 400 | 18Cr-9Ni-Mo | 18Cr-9Ni-Mo | A4-70 – EN ISO 3506-1:2020 | A4-70 – EN ISO 3506-2:2020 |
| 9 | PN40c Cl. 300 | - 60d to 400 | 18Cr-9Ni-MoG | 18Cr-9Ni-Mo | A5-50 – EN ISO 3506-1:2020 | A4-50, A4-70 – EN ISO 3506-2:2020 |
| 10 | PN100 Cl. 600 | - 60d to 400 | 18Cr-9Ni-Mog | 18Cr-9Ni-Mo | A5-70 – EN ISO 3506-1:2020 | A4-70 – EN ISO 3506-2:2020 |
| Norm of measurements | Remarks | |
|---|---|---|
| screws | Nuts | |
| EN ISO 4014:2011 | EN ISO 4032:2012 EN ISO 4033:2012a | Hexagonal screw with shaft |
| EN ISO 4017:2014 | EN ISO 4032:2012 EN ISO 4033:2012a | Hexagonal screw with shaft and continuous thread |
| Appendix A | EN ISO 4032:2012 EN ISO 4033:2012a | Threaded bolts with continuous thread |
Product Shall be Marked with our manufacturing trade mark "TorqBolt" or "TB" along with the designated Grade.
Grade and manufacturer’s identification symbols shall be applied to one end of studs and to the heads of bolts and screws of all sizes. (If the available area is inadequate, the grade symbol may be marked on one end and the manufacturer’s identification symbol marked on the other end.) For bolts and screws smaller than 1⁄4 in. [6 mm] in diameter and studs smaller than 3⁄8 in. [10 mm] in diameter and for 1⁄4 in. [6 mm] in diameter studs requiring more than a total of three symbols, the marking shall be a matter of agreement between the purchaser and the manufacturer.