Malleable Iron 321 Flange BS4504 with 4 Bolt holes BSPT Thread

Size: 1/2”-6”
Material: BS EN 1562,EN-GJMB-350-10,KTH350-10
Dimension: BS EN 10242
Thread: ISO 7-1,BS 21,BSPT
Pressure Rating: PN16/PN25
Surface Treatment:Hot-dip Galvanized,Electro Galvanized,Black
Certificate: UL Listed / FM Approved / NSF 61
Application: Fire Protection,Waterworks,HVAC,Plumbing,GAS,Irrigation,or other piping systems

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Product Description

Products Details

Malleable Iron 321 Flange BS4504 with 4 bolt holes. Flange BS4504 with 4 bolt holes is a mechanical connection commonly used to connect pipes, valves, pumps and other equipment. There are four bolt holes on the flange discs to connect with other pipe or valves. It consists of two raised discs that are tightly connected together by bolts or nuts. The material is malleable iron, the flange connect the pipe with the threaded and connect with other flanged equipment.


Size A(mm) B(mm) C(mm) D(mm) PCS/CTN.
1/2″ 15 5 67 94.5 120
3/4″ 26 5 73 99.5 100
1″ 19 6 83 114.3 80
1-1/4″ 21 6 87 119.2 50
1-1/2″ 21 7 98 134 38
2″ 26 8 115 150 24
2-1/2″ 30 9 127 164 10
3″ 33 10 146 184 8
4″ 39 11 178 214 6
6″ 40 13 235 279 4

The function of flange:

The main function of the flange is to connect and seal the various components in the piping system. It can make the assembly and disassembly of the piping system more convenient, while ensuring the sealing of the joints and preventing leakage. Flange connections can also provide a certain amount of structural strength, making the piping system more stable. In short, flange is a commonly used mechanical connector used to connect and seal various components in the pipeline system to ensure the normal operation and safety of the system.

The type of the flange

Depending on the application and requirements, flanges can come in different types and standards. Common flange types include welding flanges, threaded flanges, blind flanges, sliding flanges, etc. Each type of flange has its specific design and purpose. Malleable iron flange is one kind of threaded flange. Threaded flanges are characterized by simple connection and convenient disassembly, and are suitable for low-pressure and small-diameter pipeline systems. It is usually used in situations with strict non-sealing requirements, such as low-pressure gas pipelines, water supply pipelines, and drainage pipelines.