PCD stands for Pitch Circle Diameter, also known as Bolt Circle Diameter (BCD). The diameter of the circle that passes by the centre of the bolts.
Gaskets Suitable for Steam up to 200 deg C. Table 16
1/2" BSP (15mm) - 4 holes, 95mm OD, 14mm thick, 65mm PCD
3/4" BSP (20mm) - 4 holes, 105mm OD, 16mm thick, 75mm PCD
1" BSP (25mm) - 4 holes, 115mm OD, 16mm thick, 85mm PCD
1. 1/4" BSP (32mm) - 4 holes, 140mm OD, 16mm thick, 100mm PCD
1. 1/2" BSP (40mm) - 4 holes, 150mm OD, 16mm thick, 110mm PCD
2" BSP (50mm) - 4 holes, 165mm OD, 18mm thick, 125mm PCD
2 1/2" BSP (65mm) - 4 holes, 185mm OD, 18mm thick, 145mm PCD
4" BSP (100mm) - 8 holes, 220mm OD, 20mm thick, 180mm PCD
3" BSP thread (80mm) - 8 holes, 200mm OD, 20mm thick, 160mm PCD
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