About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
Product Category
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Blind Flanges
Welding Neck Flanges
Slip on Flanges
Lap Joint Flanges
Socket Welding Flanges
Threaded Flanges
Orifice Flanges
Long Welding Neck Flanges
Flanges are interconnecting parts between pipes and tubes, used to connect between pipe ends,the main features of flange connection are easy disassembly and good sealing performance.
Carbon Steel Flange: ASTM A 105
Stainless Steel Flange: ASTM A 182
Size: 1/2”-60” (DN15-DN3000)
Pressure class: Class150-Class2500
Facing: RF/ FM/ M/ T G/ RF / FF / RTJ
Marking: All Flanges when possible will display a heat number, size, table, grade and dimensional standard
Plate steel flange: Plate flanges are mainly used for light duty, lower pressure or non-critical applications, commonly referring to AS2129, BS10 or AS4087 standards. The manufacturing method involves cutting and machining from plate steel
Forged steel flange: Forged Steel flanges are commonly used and specified in the Oil, Gas, Petrochemical and mining sectors, where pressure, temperature and safety considerations often specify the ANSI B16.5, ASME B16.47 or BS4504 standards. The manufacturing method involves the hot forging of suitable steels prior to final machining
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BLIND FLANGES Blind flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for blind flanges, the standard height is 1/16" for blind flanges under 400#. For blind flanges of 400# and up, the standard blind flange raised face height is 1/4". Material: Carbon, Alloy and Stainless Steel Standards: ASTM A105, ASTM A182 Sizes: 1/2'' to 24'', Customized up to 48'' Thickness: Schedule 10(S) to SCH 160 Pressure Ratings: Class 150 to 2500 Face Type: RF, RTJ |
SLIP-ON FLANGES Slip on pipe flanges are typically provided with a raised or flat face. When a raised face is necessary for slip on pipe flanges, the standard height is 1/16" for slip on pipe flanges under 400#. For slip on pipe flanges of 400# and up, the standard slip on pipe flange raised face height is 1/4". Standard: ASTM A105, ASTM A182 Material: Carbon Steel, Alloy Steel, Stainless Steel Size: 1/2'' to 24'', customized up to 60'' Pressure Ratings: Class 150 to Class 2500 Face Type: RF, RTJ |
WELD NECK FLANGES Weld neck pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for weld neck pipe flanges, the standard height is 1/16" for weld neck pipe flanges under 400#. For weld neck pipe flanges of 400# and up, the standard weld neck pipe flange raised face height is 1/4". Material: Carbon, Alloy and Stainless Steel Standards: ASTM A105, ASTM A182 Sizes: 1/2'' to 24'', Customized up to 48'' Thickness: Schedule 10(S) to SCH 160 Pressure Ratings: Class 150 to 2500 Face Type: RF, RTJ |
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LAP JOINT FLANGES Slip on Pipe flanges with a hub have published specifications that range from 1/2" thru 24". Sizes above 24" are produced as lap joints to slip on dimensions. Coastal Flange provides Lap Joint pipe flanges in all material grades, specifications and sizes. Carbon steel: ASTM A105, A350 LF2 Stainless steel: A182 F304/F304L/F316/F316L/F321 Alloy steel: ASTM A182, GR F1, F11, F22, F5, F9, F91 Outer Diameters: 1/2'' to 24'' Wall Thickness Schedule: SCH 10, SCH 40, SCH 160 |
THREADED FLANGES Threaded pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for threaded pipe flanges, the standard height is 1/16" for threaded pipe flanges under 400#. For threaded pipe flanges of 400# and up, the standard threaded pipe flange raised face height is 1/4". Standard: ASTM A105, ASTM A182 Material: Carbon Steel, Stainless Steel, Alloy Steel Size Range: 1/2'', 1'', 2'', 3'', 4'' to 24'' Pressure Class: Class 150 to 2500 Face: Raised face (RF), Ring type joint (RTJ) |
SOCKET WELD FLANGES Socket Weld pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for socket weld pipe flanges, the standard height is 1/16" for socket weld pipe flanges under 400#. For socket weld pipe flanges of 400# and up, the standard socket weld pipe flange raised face height is 1/4". Standard: Carbon steel ASTM A105, ASTM A350 LF1/2, ASTM A181 Alloy steel ASTM A182 F5, F9, F11, F22, F91 Stainless steel ASTM A182 F304/L, F316/L Outer Diameters: 1/2 inch to 24 inch, up to 2500# Special made: 24'' to 60'', up to 900# Wall Thickness: Schedule 40 to 160 Pressure Ratings: Class 150 to Class 2500 Face Type: RF, RTJ |
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CLASS 150According to ASTM A/SA-105; ANSI B16.5 |
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Nominal Pipe Size |
Outside Diam. of Flange (O) |
Thick. of Flange (C) |
Diam. of Raised Face (R) |
Diam. of Hub at Base (X) |
Length thru Hub (Y) |
Min. Thread Length (T) |
Min. Counter Bore (Q) |
No. of Holes |
Diam. of Holes |
Diam. of Bolts |
Diam. of Bolt Circle |
Approx. Weight (in Pounds) |
| ½ | 3.5 | 0.44 | 1.38 | 1.19 | 0.62 | 0.62 | | 4 | 0.62 | 0.5 | 2.38 | 1 |
| ¾ | 3.88 | 0.5 | 1.69 | 1.5 | 0.62 | 0.62 | | 4 | 0.62 | 0.5 | 2.75 | 2 |
| 1 | 4.25 | 0.56 | 2 | 1.94 | 0.69 | 0.69 | | 4 | 0.62 | 0.5 | 3.12 | 2 |
| 1 ¼ | 4.62 | 0.62 | 2.5 | 2.31 | 0.81 | 0.81 | | 4 | 0.62 | 0.5 | 3.5 | 3 |
| 1 ½ | 5 | 0.69 | 2.88 | 2.56 | 0.88 | 0.88 | | 4 | 0.62 | 0.5 | 3.88 | 3 |
| 2 | 6 | 0.75 | 3.62 | 3.06 | 1 | 1 | | 4 | 0.75 | 0.62 | 4.75 | 5 |
| 2 ½ | 7 | 0.88 | 4.12 | 3.56 | 1.12 | 1.12 | | 4 | 0.75 | 0.62 | 5.5 | 7 |
| 3 | 7.5 | 0.94 | 5 | 4.25 | 1.19 | 1.19 | | 4 | 0.75 | 0.62 | 6 | 8 |
| 3 ½ | 8.5 | 0.94 | 5.5 | 4.81 | 1.25 | 1.25 | | 8 | 0.75 | 0.62 | 7 | 11 |
| 4 | 9 | 0.94 | 6.19 | 5.31 | 1.31 | 1.31 | | 8 | 0.75 | 0.62 | 7.5 | 13 |
| 5 | 10 | 0.94 | 7.31 | 6.44 | 1.44 | 1.44 | | 8 | 0.88 | 0.75 | 8.5 | 15 |
| 6 | 11 | 1 | 8.5 | 7.56 | 1.56 | 1.56 | | 8 | 0.88 | 0.75 | 9.5 | 19 |
| 8 | 13.5 | 1.12 | 10.62 | 9.69 | 1.75 | 1.75 | | 8 | 0.88 | 0.75 | 11.75 | 30 |
| 10 | 16 | 1.19 | 12.75 | 12 | 1.94 | 1.94 | | 12 | 1 | 0.88 | 14.25 | 43 |
| 12 | 19 | 1.25 | 15 | 14.38 | 2.19 | 2.19 | | 12 | 1 | 0.88 | 17 | 64 |
| 14 | 21 | 1.38 | 16.25 | 15.75 | 2.25 | 2.25 | | 12 | 1.12 | 1 | 18.75 | 90 |
| 16 | 23.5 | 1.44 | 18.5 | 18 | 2.5 | 2.5 | | 16 | 1.12 | 1 | 21.25 | 98 |
| 18 | 25 | 1.56 | 21 | 19.88 | 2.69 | 2.69 | | 16 | 1.25 | 1.13 | 22.75 | 130 |
| 20 | 27.5 | 1.69 | 23 | 22 | 2.88 | 2.88 | | 20 | 1.25 | 1.12 | 25 | 165 |
| 24 | 32 | 1.88 | 27.25 | 26.12 | 3.25 | 3.25 | | 20 | 1.38 | 1.25 | 29.5 | 220 |
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CLASS 300According to ASTM A/SA-105; ANSI B16.5 |
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Nominal Pipe Size |
Outside Diam. of Flange (O) |
Thick. of Flange (C) |
Diam. of Raised Face (R) |
Diam. of Hub at Base (X) |
Length thru Hub (Y) |
Min. Thread Length (T) |
Min. Counter Bore (Q) |
No. of Holes |
Diam. of Holes |
Diam. of Bolts |
Diam. of Bolt Circle |
Approx. Weight (in Pounds) |
| 1/2 | 3.75 | 0.56 | 1.38 | 1.5 | 0.88 | 0.62 | 0.93 | 4 | 0.62 | 0.5 | 2.62 | 2 |
| 3/4 | 4.62 | 0.62 | 1.69 | 1.88 | 1 | 0.62 | 1.14 | 4 | 0.75 | 0.62 | 3.25 | 3 |
| 1 | 4.88 | 0.69 | 2 | 2.12 | 1.06 | 0.69 | 1.41 | 4 | 0.75 | 0.62 | 3.5 | 3 |
| 1 1/4 | 5.25 | 0.75 | 2.5 | 2.5 | 1.06 | 0.81 | 1.75 | 4 | 0.75 | 0.62 | 3.88 | 4 |
| 1 1/2 | 6.12 | 0.81 | 2.88 | 2.75 | 1.19 | 0.88 | 1.99 | 4 | 0.88 | 0.75 | 4.5 | 6 |
| 2 | 6.5 | 0.88 | 3.62 | 3.31 | 1.31 | 1.12 | 2.5 | 8 | 0.75 | 0.62 | 5 | 7 |
| 2 1/2 | 7.5 | 1 | 4.12 | 3.94 | 1.5 | 1.25 | 3 | 8 | 0.88 | 0.75 | 5.88 | 10 |
| 3 | 8.25 | 1.12 | 5 | 4.62 | 1.69 | 1.25 | 3.63 | 8 | 0.88 | 0.75 | 6.62 | 13 |
| 3 1/2 | 9 | 1.19 | 5.5 | 5.25 | 1.75 | 1.44 | 4.13 | 8 | 0.88 | 0.75 | 7.25 | 17 |
| 4 | 10 | 1.25 | 6.19 | 5.75 | 1.88 | 1.44 | 4.63 | 8 | 0.88 | 0.75 | 7.88 | 22 |
| 5 | 11 | 1.38 | 7.31 | 7 | 2 | 1.69 | 5.69 | 8 | 0.88 | 0.75 | 9.25 | 28 |
| 6 | 12.5 | 1.44 | 8.5 | 8.12 | 2.06 | 1.81 | 6.75 | 12 | 0.88 | 0.75 | 10.62 | 39 |
| 8 | 15 | 1.62 | 10.62 | 10.25 | 2.44 | 2 | 8.75 | 12 | 1 | 0.88 | 13 | 58 |
| 10 | 17.5 | 1.88 | 12.75 | 12.62 | 2.62 | 2.19 | 10.88 | 16 | 1.12 | 1 | 15.25 | 81 |
| 12 | 20.5 | 2 | 15 | 14.75 | 2.88 | 2.38 | 12.94 | 16 | 1.25 | 1.12 | 17.75 | 115 |
| 14 | 23 | 2.12 | 16.25 | 16.75 | 3 | 2.5 | 14.19 | 20 | 1.25 | 1.12 | 20.25 | 165 |
| 16 | 25.5 | 2.25 | 18.5 | 19 | 3.25 | 2.69 | 16.19 | 20 | 1.38 | 1.25 | 22.5 | 190 |
| 18 | 28 | 2.38 | 21 | 21 | 3.5 | 2.75 | 18.19 | 24 | 1.38 | 1.25 | 24.75 | 250 |
| 20 | 30.5 | 2.5 | 23 | 23.12 | 3.75 | 2.88 | 20.19 | 24 | 1.38 | 1.25 | 27 | 315 |
| 24 | 36 | 2.75 | 27.25 | 27.62 | 4.19 | 3.25 | 24.19 | 24 | 1.62 | 1.5 | 32 | 475 |
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CLASS 600According to ASTM A/SA-105; ANSI B16.5 |
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Nominal Pipe Size |
Outside Diam. of Flange (O) |
Thick. of Flange (C) |
Diam. of Raised Face (R) |
Diam. of Hub at Base (X) |
Length thru Hub (Y) |
Min. Thread Length (T) |
Min. Counter Bore (Q) |
No. of Holes |
Diam. of Holes |
Diam. of Bolts |
Diam. of Bolt Circle |
Approx. Weight (in Pounds) |
| 1/2 | 3.75 | 0.56 | 1.38 | 1.5 | 0.88 | 0.62 | 0.93 | 4 | 0.62 | 0.5 | 2.62 | 2 |
| 3/4 | 4.62 | 0.62 | 1.69 | 1.88 | 1 | 0.62 | 1.14 | 4 | 0.75 | 0.62 | 3.25 | 3 |
| 1 | 4.88 | 0.69 | 2 | 2.12 | 1.06 | 0.69 | 1.41 | 4 | 0.75 | 0.62 | 3.5 | 4 |
| 1 1/4 | 5.25 | 0.81 | 2.5 | 2.5 | 1.12 | 0.81 | 1.75 | 4 | 0.75 | 0.62 | 3.88 | 5 |
| 1 1/2 | 6.12 | 0.88 | 2.88 | 2.75 | 1.25 | 0.88 | 1.99 | 4 | 0.88 | 0.75 | 4.5 | 7 |
| 2 | 6.5 | 1 | 3.62 | 3.31 | 1.44 | 1.12 | 2.5 | 8 | 0.75 | 0.62 | 5 | 9 |
| 2 1/2 | 7.5 | 1.12 | 4.12 | 3.94 | 1.62 | 1.25 | 3 | 8 | 0.88 | 0.75 | 5.88 | 13 |
| 3 | 8.25 | 1.25 | 5 | 4.62 | 1.81 | 1.38 | 3.63 | 8 | 0.88 | 0.75 | 6.62 | 16 |
| 3 1/2 | 9 | 1.38 | 5.5 | 5.25 | 1.94 | 1.56 | 4.13 | 8 | 1 | 0.88 | 7.25 | 21 |
| 4 | 10.75 | 1.5 | 6.19 | 6 | 2.12 | 1.62 | 4.63 | 8 | 1 | 0.88 | 8.5 | 37 |
| 5 | 13 | 1.75 | 7.31 | 7.44 | 2.38 | 1.88 | 5.69 | 8 | 1.12 | 1 | 10.5 | 63 |
| 6 | 14 | 1.88 | 8.5 | 8.75 | 2.62 | 2 | 6.75 | 12 | 1.12 | 1 | 11.5 | 80 |
| 8 | 16.5 | 2.19 | 10.62 | 10.75 | 3 | 2.25 | 8.75 | 12 | 1.25 | 1.12 | 13.75 | 115 |
| 10 | 20 | 2.5 | 12.75 | 13.5 | 3.38 | 2.56 | 10.88 | 16 | 1.38 | 1.25 | 17 | 170 |
| 12 | 22 | 2.62 | 15 | 15.75 | 3.62 | 2.75 | 12.94 | 20 | 1.38 | 1.25 | 19.25 | 200 |
| 14 | 23.75 | 2.75 | 16.25 | 17 | 3.69 | 2.88 | 14.19 | 20 | 1.5 | 1.38 | 20.75 | 230 |
| 16 | 27 | 3 | 18.5 | 19.5 | 4.19 | 3.06 | 16.19 | 20 | 1.62 | 1.5 | 23.75 | 330 |
| 18 | 29.25 | 3.25 | 21 | 21.5 | 4.62 | 3.12 | 18.19 | 20 | 1.75 | 1.63 | 25.75 | 400 |
| 20 | 32 | 3.5 | 23 | 24 | 5 | 3.25 | 20.19 | 24 | 1.75 | 1.62 | 28.5 | 510 |
| 24 | 37 | 4 | 27.25 | 28.25 | 5.5 | 3.62 | 24.19 | 24 | 2 | 1.88 | 33 | 730 |
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CLASS 900According to ASTM A/SA-105; ANSI B16.5 |
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Nominal Pipe Size |
Outside Diam. of Flange (O) |
Thick. of Flange (C) |
Diam. of Raised Face (R) |
Diam. of Hub at Base (X) |
Length thru Hub (Y) |
Min. Thread Length (T) |
Min. Counter Bore (Q) |
No. of Holes |
Diam. of Holes |
Diam. of Bolts |
Diam. of Bolt Circle |
Approx. Weight (in Pounds) |
| 1/2 | 4.75 | 0.88 | 1.38 | 1.5 | 1.25 | 0.88 | 0.93 | 4 | 0.88 | 0.75 | 3.25 | 4 |
| 3/4 | 5.12 | 1 | 1.69 | 1.75 | 1.38 | 1 | 1.14 | 4 | 0.88 | 0.75 | 3.5 | 5 |
| 1 | 5.88 | 1.12 | 2 | 2.06 | 1.62 | 1.12 | 1.41 | 4 | 1 | 0.88 | 4 | 8 |
| 1 1/4 | 6.25 | 1.12 | 2.5 | 2.5 | 1.62 | 1.19 | 1.75 | 4 | 1 | 0.88 | 4.38 | 9 |
| 1 1/2 | 7 | 1.25 | 2.88 | 2.75 | 1.75 | 1.25 | 1.99 | 4 | 1.12 | 1 | 4.88 | 12 |
| 2 | 8.5 | 1.5 | 3.62 | 4.12 | 2.25 | 1.5 | 2.5 | 8 | 1 | 0.88 | 6.5 | 25 |
| 2 1/2 | 9.62 | 1.62 | 4.12 | 4.88 | 2.5 | 1.88 | 3 | 8 | 1.12 | 1 | 7.5 | 36 |
| 3 | 9.5 | 1.5 | 5 | 5 | 2.12 | 1.62 | 3.63 | 8 | 1 | 0.88 | 7.5 | 26 |
| 4 | 11.5 | 1.75 | 6.19 | 6.25 | 2.75 | 1.88 | 4.63 | 8 | 1.25 | 1.12 | 9.25 | 53 |
| 5 | 13.75 | 2 | 7.31 | 7.5 | 3.12 | 2.12 | 5.69 | 8 | 1.38 | 1.25 | 11 | 83 |
| 6 | 15 | 2.19 | 8.5 | 9.25 | 3.38 | 2.25 | 6.75 | 12 | 1.25 | 1.12 | 12.5 | 110 |
| 8 | 18.5 | 2.5 | 10.62 | 11.75 | 4.00 | 2.50 | 8.75 | 12 | 1.5 | 1.38 | 15.5 | 170 |
| 10 | 21.5 | 2.75 | 12.75 | 14.5 | 4.25 | 2.81 | 10.88 | 16 | 1.5 | 1.38 | 18.5 | 245 |
| 12 | 24 | 3.12 | 15 | 16.5 | 4.62 | 3 | 12.94 | 20 | 1.5 | 1.38 | 21 | 325 |
| 14 | 25.25 | 3.38 | 16.25 | 17.75 | 5.12 | 3.25 | 14.19 | 20 | 1.62 | 1.5 | 22 | 400 |
| 16 | 27.75 | 3.5 | 18.5 | 20 | 5.25 | 3.38 | 16.19 | 20 | 1.75 | 1.63 | 24.25 | 425 |
| 18 | 31 | 4 | 21 | 22.25 | 6 | 3.5 | 18.19 | 20 | 2 | 1.88 | 27 | 600 |
| 20 | 33.75 | 4.25 | 23 | 24.5 | 6.25 | 3.62 | 20.19 | 20 | 2.12 | 2 | 29.5 | 730 |
| 24 | 41 | 5.5 | 27.25 | 29.5 | 8 | 4 | 24.19 | 20 | 2.62 | 2.5 | 35.5 | 1400 |
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CLASS 1500According to ASTM A/SA-105; ANSI B16.5 |
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Nominal Pipe Size |
Outside Diam. of Flange (O) |
Thick. of Flange (C) |
Diam. of Raised Face (R) |
Diam. of Hub at Base (X) |
Length thru Hub (Y) |
Min. Thread Length (T) |
Min. Counter Bore (Q) |
No. of Holes |
Diam. of Holes |
Diam. of Bolts |
Diam. of Bolt Circle |
Approx. Weight (in Pounds) |
| 1/2 | 4.75 | 0.88 | 1.38 | 1.5 | 1.25 | 0.88 | 0.93 | 4 | 0.88 | 0.75 | 3.25 | 4 |
| 3/4 | 5.12 | 1 | 1.69 | 1.75 | 1.38 | 1 | 1.14 | 4 | 0.88 | 0.75 | 3.5 | 5 |
| 1 | 5.88 | 1.12 | 2 | 2.06 | 1.62 | 1.12 | 1.41 | 4 | 1 | 0.88 | 4 | 8 |
| 1 1/4 | 6.25 | 1.12 | 2.5 | 2.5 | 1.62 | 1.19 | 1.75 | 4 | 1 | 0.88 | 4.38 | 9 |
| 1 1/2 | 7 | 1.25 | 2.88 | 2.75 | 1.75 | 1.25 | 1.99 | 4 | 1.12 | 1 | 4.88 | 12 |
| 2 | 8.5 | 1.5 | 3.62 | 4.12 | 2.25 | 1.5 | 2.5 | 8 | 1 | 0.88 | 6.5 | 25 |
| 2 1/2 | 9.62 | 1.62 | 4.12 | 4.88 | 2.5 | 1.88 | 3 | 8 | 1.12 | 1 | 7.5 | 36 |
E-mail: sales@eastern-steels.com
