M5 x 16 tamperproof screw M5 x 20 tamperproof screw Ex ES 98 ST-11 Ex ES 98 ST-02 Ex ES 99 ST-11 -60°C X (mechanical function down to -50°C) Ex ES 99 ST-02 -60°C X (mechanical function down to -50°C) ST 98/99-B1 straight ST 98/99-B1 straight, rubber mounting ST 98/99-B5 angled ST 98/99-B6 flexible Ex 355 AZ 1Ö/1S Ex 355 AZ 2Ö AZ 335/355-B1 straight AZ 335/355-B1-2245 straight, rubber mounting AZ 335/355-B5 angled AZ 335/355-B5-flex angled