Square Flanges
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Description:
Square flanges are made in accordance with JIS B2291 / JIS F7806 standards. Square flanges are used for between pipe-to-pipe or pipe-to-components connections. They are mostly used in hydraulic systems line where there is a passage of fluids and are made of two materials which is steel and stainless steel. There are 3 type of designs for square flanges: SHAB Square Flanges, SSAB Square Flanges, and KAB Square Flanges. The pressure ratings for square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm². It is with a single available socket weld connection that requires the pipe to have plain connection ends. Features:
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Square Flanges Product Information

Specifications:
Square flange is a square shape flange that used in between pipe to pipe or pipe to components connections, like valves, tees, and elbows. Square flanges are made in accordance to JIS B2291 / JIS F7806 standard. It links the JIS standard nominal bore size pipes together in a hydraulic system. Square flanges are mostly used in hydraulic oil systems or steam lines.
Material:
The materials used to fabricate square flanges are steel (SF440A) and stainless steel (SS316).
Size Range & Pressure Rating:
The sizes of square flanges range from 1/4" to 6" in nominal bore sizes. Pressure rating of square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm².
Square flange is a square shape flange that used in between pipe to pipe or pipe to components connections, like valves, tees, and elbows. Square flanges are made in accordance to JIS B2291 / JIS F7806 standard. It links the JIS standard nominal bore size pipes together in a hydraulic system. Square flanges are mostly used in hydraulic oil systems or steam lines.
Material:
The materials used to fabricate square flanges are steel (SF440A) and stainless steel (SS316).
Size Range & Pressure Rating:
The sizes of square flanges range from 1/4" to 6" in nominal bore sizes. Pressure rating of square flanges are available in 210 kg/cm², 280 kg/cm², and 350 kg/cm².

Connections Type & Configurations:
The only available connection for square flanges is socket weld where the connection sides of pipes need to be plain ended. There are various types of configurations for square flange: SHAB, SSAB, KAB, LSA, and Blind Flange.
SHAB series is a complete set of 210 kg/cm² square flange that combined by hexagon hex bolts with nuts, while SSAB series is a complete set of 210 kg/cm² square flange combined by a socket cap screw. For KAB series, it is a complete set of 280 kg/cm² or 350 kg/cm² square flange combined by hexagon hex bolts with nuts.
The flange body of SHAB are larger than SSAB. Complete set of square flange includes male flange (flat side), female flange (o ring side), o ring, and bolts. The female flange is identified as A and male flange is identified as B. Thus, the complete set is AB.
LSA is a special type o ring side square flange where the internal flow is in L shaped. Blind flanges are used to seal the flow at the end of a piping system. They are typically used to run a pressure testing of fluids through vessel or pipes. For the termination of hydraulic system, only one side of blind flange is used, either o ring side or flat side.
The only available connection for square flanges is socket weld where the connection sides of pipes need to be plain ended. There are various types of configurations for square flange: SHAB, SSAB, KAB, LSA, and Blind Flange.
SHAB series is a complete set of 210 kg/cm² square flange that combined by hexagon hex bolts with nuts, while SSAB series is a complete set of 210 kg/cm² square flange combined by a socket cap screw. For KAB series, it is a complete set of 280 kg/cm² or 350 kg/cm² square flange combined by hexagon hex bolts with nuts.
The flange body of SHAB are larger than SSAB. Complete set of square flange includes male flange (flat side), female flange (o ring side), o ring, and bolts. The female flange is identified as A and male flange is identified as B. Thus, the complete set is AB.
LSA is a special type o ring side square flange where the internal flow is in L shaped. Blind flanges are used to seal the flow at the end of a piping system. They are typically used to run a pressure testing of fluids through vessel or pipes. For the termination of hydraulic system, only one side of blind flange is used, either o ring side or flat side.
How to assemble Square Flanges
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Square Flanges are used for high pressure hydraulic applications up to 350kgf/cm². In order to use and assemble square flanges safely, it is important to know the right procedures and torque range for assembly.
Square Flanges made in accordance to JIS B2291 / JIS F7806 standard are connecting pieces that links Japanese Industrial Standards nominal bore size pipes together and has a working pressure of up to 350kgf/cm². The pipes used should be of hydraulic seamless design and suitable for high pressure applications. It is important to note that every hydraulic system requires some form of fitting installation. Hence, proper fabrication and installation are essential for leak free performance, the overall efficiency , and general appearance of any system. In order to use and assemble Square Flanges safely, it is essential to know the right procedures. Do watch our youtube video and our instructions below carefully! |
Assembly of Square Flanges:
Below are the instructions for assembly of Square Flanges.
Below are the instructions for assembly of Square Flanges.
Impa Code for Square Flanges
Square Flanges can be found in the IMPA Marine Stores Guide, which is the world’s leading reference guide for maritime purchasing and supply.
For details on the reference codes of square flanges, please kindly see below:
For details on the reference codes of square flanges, please kindly see below:
SHA SQUARE FLANGES:
IMPA CODE: 734801 15A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734802 20A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734803 25A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734804 32A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734805 40A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734806 50A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734807 65A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734808 80A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734801 15A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734802 20A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734803 25A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734804 32A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734805 40A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734806 50A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734807 65A SHA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734808 80A SHA SQUARE FLANGE ORING SIDE ONLY
SHB SQUARE FLANGES:
IMPA CODE: 734811 15A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734812 20A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734813 25A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734814 32A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734815 40A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734816 50A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734817 65A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734818 80A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734811 15A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734812 20A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734813 25A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734814 32A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734815 40A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734816 50A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734817 65A SHB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734818 80A SHB SQUARE FLANGE FLAT SIDE ONLY
SSA SQUARE FLANGES:
IMPA CODE: 734821 15A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734822 20A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734823 25A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734824 32A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734825 40A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734826 50A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734827 65A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734828 80A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734821 15A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734822 20A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734823 25A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734824 32A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734825 40A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734826 50A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734827 65A SSA SQUARE FLANGE ORING SIDE ONLY
IMPA CODE: 734828 80A SSA SQUARE FLANGE ORING SIDE ONLY
SSB SQUARE FLANGES:
IMPA CODE: 734831 15A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734832 20A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734833 25A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734834 32A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734835 40A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734836 50A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734837 65A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734838 80A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734831 15A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734832 20A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734833 25A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734834 32A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734835 40A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734836 50A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734837 65A SSB SQUARE FLANGE FLAT SIDE ONLY
IMPA CODE: 734838 80A SSB SQUARE FLANGE FLAT SIDE ONLY
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