Fastener quality assurance for installation with calibrated depth gauge S-DG BT
In order to ensure the exact screw-in depth and a properly compressed sealing washer , the S-BT HL studs have to be installed with the appropriate depth gauge . With this tool the screw-in depth can be adjusted in a range of ~ 0-1.5 mm ( 3 steps , ~ 0.5 mm per step ).
The S-CC BT calibration card is needed to check the initial stand-off of the S-BT HL stud and to adjust / calibrate the S-DG BT depth gauge . After finding the right adjustment level for the S-DG BT depth gauge , the gauge can be adjusted and the studs can be installed without additional check of the S-DG BT depth gauge .
S-DG BT mechanical depth gauge
The correct stud stand-off has to be checked and , if necessary , the depth gauge has to be re-adjusted ( calibrated ) at following times :
• Start of the installation process
• Change of the working position ( upwards , downwards , horizontal ) and base material ( thickness , strength , type )
• Installer change
• After each package change after the installation of 100 S-BT studs
Design and functionality of the mechanical calibration card S-CC BT
The lifetime of the S-DG BT depth gauge is ≧ 1000 settings .
Fastener quality assurance for installation with SBT 6-22 and S-SH BT
In order to ensure the exact screw-in depth and a proper compressed sealing washer , the S-BT HL studs may be installed with the SBT 6-22 tool . With this tool the screw-in depth of the S-BT HL studs is controlled .
The S-IC BT inspection card can be used to check the standoff in cases where the washer compression of the S-BT HL is assessed as incorrect ( over or under compressed ). Based on the coating thickness specified , the user can see if the inspection card shows green in this region . Green indicates the stud is set within the correct embedment depth range . Orange indicates that the stud is under set . To achieve the correct embedment depth , the user can place the tool over the stud and re-trigger in BT mode . This will incrementally add 1 / 4 rotations . After each trigger the user shall check with the inspection card and stop when the inspection card shows green . If the card shows red , this indicates that the stud is overset and should not be used .
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