... : Socket welding fittingsThe socket welding fittings we supplied as following standards: British system seriesMetric system seriesANSI ... (B series)HG21634 (Metric system series)For domestic metric system pipe, it doesn’t say schedule but thickness. So you shall ... , low-temperature steel, monel and nickel alloy.The socket welding fittings include: 90°Elbow, 45°Elbow, Socket weld tee, Socket-welded ...