GB 3446-2026 Siamese connection

GB 3446-2013 Siamese connection

GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances GB/T 1176-1987 Specification for cast copper alloys GB/T 1176-2013 Casting copper and copper alloys GB/T 1348-1988 Spheroidal graphite iron castings GB/T 1348-2009 Spheroidal graphite iron castings GB/T 1348-2019 Spheroidal graphite iron castings GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 4423-1992 Wrought copper and copper alloys—Drawn rods and bars GB/T 4423-2007 Copper and copper-alloy cold-drawn rod and bar GB/T 4423-2020 Copper and copper alloy cold-drawn rod and bar GB 5135.11-2006 Automatic sprinkler system—Part 11:Grooved couplings and fittings GB 5135.11-2025 Automatic sprinkler systems—Part 11:Grooved pipe couplings and fittings GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads GB/T 9124.1-2019 Steel pipe flanges—Part 1:PN designated GB/T 9439-1988 Grey iron castings GB/T 9439-2010 Grey iron castings GB/T 9439-2023 Grey iron castings GB 12514-1990 Performance requirements and test methods for fire coupling GB 12514-2026 Technical specifications for fire couplings GB 12514.1-2005 Fire coupling—Part 1:General technical conditions for fire coupling GB 12514.2-2006 Fire coupling—Part 2:Patterns and basic parameters for fire snap-types coupling GB 12514.3-2006 Fire coupling—Part 3:Patterns and basic parameters for fire insertion-type coupling GB 12514.4-2006 Fire coupling—Part 4:Patterns and basic parameters for fire screw-type coupling GB/T 17241.1-1998 Synoptic table for cast iron pipe flanges GB/T 17241.1-2024 Cast iron pipe flanges—Part 1:PN designated JB/T 7273.3-2014 JB/T 7273.3-2014 Hand Wheel JB/T 7273.3-1994 handwheel