Marking
In addition to the binding marking requirements (ISO 898-1, ISO 898-2, EN 14399-3, EN 14399-4 and EN 14399-10), SBE bolts and nuts are marked both with an identification code
that ensures the traceability of the production process records and with the CE marking.
OPERATING INSTRUCTIONS
OPERATING INSTRUCTIONS FOR HIGH-STRENGTH STRUCTURAL BOLTING EN 14399 MANUFACTURED BY SBE-VARVIT
ATTENTION! High strength structural bolting assemblies for preloading according to EN 14399 are very sensitive to differences in manufacture and lubrication.
For this reason:
1) according to EN 14399-1, bolts produced by SBE-VARVIT have to be used only with nuts and washers produced by SBEVARVIT in the “as delivered” conditions;
2) nuts produced by SBE-VARVIT are treated with a long lasting lubricant. Utilization of other lubricants could modify the original and approved relationship between tightening and preloading and it is absolutely forbidden;
3) storage conditions from delivery to use on site must not compromise the surface conditions of bolts, nuts and washers and consequently the material has to be kept under roof and protected against atmospheric agents. Utilization of wet or oxidized components may lead to fail the requested preloading;
4) tightening can be carried out both with torque method (see tab. A) and combined method (see tab. B).
The Final tightening torque Mr (=1,10 Mr,i) is shown on nuts packaging and has to be applied using calibrated torque wrenches with an accuracy of ± 4% according to EN ISO 6789 by rotation of the nut; different tightening procedures have to be approved by experimental tightening tests under site conditions as specified in annex H of European Standard EN 1090-2: 2008+A1:2011;
5) torque wrenches have to be checked for accuracy according to EN 1090-2:2008+A1:2011;
6) impact wrenches may be used only for the first tightening step (ref. EN 1090-2:2008+A1:2011 par. 8.5.3);
INFORMATION RELATED TO TIGHTENING METHOD
Post time: Nov-24-2022