Answer:
ST4 A models have a 220 mm diameter cylinder with 700 mm or 900 mm height, whereas ST4 B models feature a 275 mm diameter cylinder with 900 mm to 1000 mm height. Both can be specified with hydraulic or pneumatic drives (ST4 H/P) and matched to fixed or removable companion bollards (ST4 F/R).
The Swaraj Secutech ST-4 series is structured into distinct engineering configurations to match roadway widths, architectural aesthetics, and site-specific threat levels:
- ST4 A Configuration: Utilizes a 220 mm cylinder diameter, with vertical cylinder extension heights available in 700 mm or 900 mm.
- ST4 B Configuration: Increases the bollard profile to a 275 mm cylinder diameter, with vertical cylinder extension heights between 900 mm and 1000 mm for enhanced visual presence and perimeter line resistance.
- Drive and Mounting Options: Both sizing frameworks are designated as ST4 (A/B)(H/P) for automated hydraulic or pneumatic drive units, and ST4 (A/B)(F/R) for stationary matching perimeter solutions (fixed shallow-mount or manual removable variants).
Both variant families utilize identical anti-corrosion architecture: internal carbon steel components are fully galvanized, top plates are stainless steel, visual alerting is provided through top red LEDs and reflective bands, and external sleeves can be ordered in SS 304, SS 316, or RAL painted finishes.
