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Bs 4504 Flanges

Bs 4504 Flanges are circular flanges that are made up of steel and grey or malleable cast iron. The size of the flange ranges from DN 15 to DN2000 and the types differ as weld neck flanges threaded flanges, slip on flanges, plate flanges, blind flanges and so on. The Bs 4504 Pn16 Flanges have low pressure capacities according to pressure number PN16. There are flanges ranging from PN6 to PN64. These flanges can be either forged or stamped during manufacture. The material grades used for the making of the BS 4504 Pipe Flanges vary according to ASTM A182.

BS 4504 Flanges

BS 4504 Flanges

BS 4504 PN 10 Flange

BS 4504 PN 10 Flange

Bs 4504 Forged Flange

Bs 4504 Forged Flange

The materials can be A240 F304, 304L, 304H, 316 and so on up to 904L. The different application types require different materials for the making of the Bs 4504 Pn 10 Flanges and other pressure numbers. There are duplex and super duplex grade flanges as well as carbon steel flanges. The carbon steel can also be low temperature carbon steel. The Bs 4504 Forged Flange is derived from one piece of the raw material so that it is stronger. For high strength, high temperature and high pressure applications, the high alloy steels are used. The copper alloys and nickel alloy flanges are also available in this range. The Carbon Steel BS 4504 Flange has high wear and tear resistance along with high toughness. There are different classes and dimensions to the different types of the DIN86029 PN10 BS 4504 Flanges. The types vary such as blind flanges, welded flanges, socket weld flanges and lap joint flanges. The BS 4504 PN6 Flange is used in power generation, oil and gas, water lines and in other general corrosive applications as well.

Table of Content



Specification of Bs 4504 Flanges


Size Chart 1/2" (15 NB) to 48" (1200NB)
Pressure Rating ANSI Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Pressure Calculation in DIN 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
BS 4504 Flange Standards ANSI/ASME B16.5, B16.47 Series B & B, B16.48, BS4504, BS 4504, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092
JIS 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
UNI 6Bar 10Bar 16Bar 25Bar 40Bar
EN 6Bar 10Bar 16Bar 25Bar 40Bar
Coating Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized
Most common types of BS 4504 Flange Forged / Threaded / Screwed / Plate
Test Certificates EN 10204/3.1B
Raw Materials Certificate
100% Radiography Test Report
Third Party Inspection Report, etc
Production technique
  • Forged, Heat treated and machined
Connect Type/ Flange Face Type Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, , Groove
Special design

As per your drawing

AS, ANSI, BS, DIN and JIS
15 NB (1/2") to 200 NB (8")
Equal and Reducing Configurations
Test Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector
Equipment Press machine, Bending machine, Pushing Machine, electric bevelling machine, Sand-blasting machine etc
BS 4504 Flange Uses & application
  • Heavy oil refineries.
  • Bitumen upgraders.
  • Nuclear power (mostly seamless).
  • Petrochemicals and acids.
Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2, Test Certificates certifying NACE MR0103, NACE MR0175

Frequently Used Bs 4504 Pn 10 Flanges Types


Carbon Steel BS 4504 PN16 plate flange

Carbon Steel BS 4504 PN16 plate flange

Copper Nickel BS4504 PN6 orifice plate flanges

Copper Nickel BS4504 PN6 orifice plate flanges

ASTM A105 BS4504 Table 6 threaded Plate Flanges

ASTM A105 BS4504 Table 6 threaded Plate Flanges

ASTM A182 F304L BS4504 PN40 plate flanges

ASTM A182 F304L BS4504 PN40 plate flanges

ASME SA105N BS 4504 PN 64 loose plate flange

ASME SA105N BS 4504 PN 64 loose plate flange

ASTM A105 Carbon Steel BS4504 PN16 slip on plate flanges

ASTM A105 Carbon Steel BS4504 PN16 slip on plate flanges

ASTM A350 LF2 BS 4504 PN 6 pipe plate flanges

ASTM A350 LF2 BS 4504 PN 6 pipe plate flanges

ASTM A694 F42 BS4504 Table 25 blind plate flanges

ASTM A694 F42 BS4504 Table 25 blind plate flanges

ASTM A182 F304 BS4504 t10 flange plate

ASTM A182 F304 BS4504 t10 flange plate

Titanium BS4504 PN25 plate pipe flange

Titanium BS4504 PN25 plate pipe flange

ASTM A182 F316 BS4504 Table 16 Plate fabricated flanges

ASTM A182 F316 BS4504 Table 16 Plate fabricated flanges

Duplex Steel BS 4504 PN10 screwed Plate Flanges

Duplex Steel BS 4504 PN10 screwed Plate Flanges


Bs 4504 Pn 16 Flange Dimensions


Nom. Size Flange Raised Face Boss Drilling  

Bolting		 Neck Bore Diameter
DN A C C1 C2 D D1 G X N No. I J   M F E R T B
10 90 14 14 14 20 35 40 2 30 4 14 60 M12 28 17.2 6 3 1.8 18.0
15 95 14 14 14 20 35 45 2 35 4 14 65 M12 32 21.3 6 3 2.0 22.0
20 105 16 16 16 24 38 58 2 45 4 14 75 M12 39 26.9 6 4 2.3 27.5
25 115 16 16 16 24 38 68 2 52 4 14 85 M12 46 33.7 6 4 2.6 34.5
32 140 16 18 16 26 40 78 2 60 4 18 100 M16 56 42.4 6 5 2.6 43.5
40 150 16 18 16 26 42 88 3 70 4 18 110 M16 64 48.3 7 5 2.6 49.5
50 165 18 20 18 28 45 102 3 84 4 18 125 M16 74 60.3 8 5 2.9 61.5
65 185 18 20 18 32 45 122 3 104 4 / 8 18 145 M16 92 76.1 10 6 2.9 77.5
80 200 20 20 20 34 50 138 3 118 8 18 160 M16 110 88.9 10 6 3.2 90.5
100 220 20 22 20 40 52 162 3 140 8 18 180 M16 130 114.3 12 6 3.6 116.0
125 * 250 22 22 22 44 55 188 3 168 8 18 210 M16 158 139.7 12 6 4.0 141.5
150 285 22 24 22 44 55 212 3 195 8 22 240 M20 184 168.3 12 8 4.5 170.5
200 340 24 26 24 44 62 268 3 246 12 22 295 M20 234 219.1 16 8 5.6 221.5
250 405 26 29 26 46 70 320 3 298 12 26 355 M24 288 273.0 16 10 6.3 276.5
300 460 28 32 28 46 78 378 4 350 12 26 410 M24 342 323.9 16 10 7.1 327.6
350 520 30 35 30 57 82 438 4 400 16 26 470 M24 390 355.6 16 10 8.0 359.0
400 580 32 38 32 63 85 490 4 456 16 30 525 M27 444 406.4 16 10 8.0 411.0
450 640 34 42 36 63 87 550 4 502 20 30 585 M27 490 457.0 16 12 8.0 462.0
500 715 34 46 36 73 90 610 4 559 20 33 650 M30 546 508.0 16 12 8.0 513.5
600 840 36 52 44 83 95 725 5 658 20 36 770 M33 650 610.0 18 12 8.8 616.5
700 910 36 60 48 83 100 795 5 760 24 36 840 M33 750 711.0 18 12 8.6 –
800 1025 38 68 52 90 105 900 5 864 24 39 950 M36 848 813.0 20 12 10.0 –
900 1125 40 76 58 94 110 1000 5 968 28 39 1050 M36 948 914.0 20 12 10.0 –
1000 1255 42 84 64 100 120 1115 5 1072 28 42 1170 M39 1056 1016.0 22 12 10.0 –
1200 1485 48 98 76 – 130 1330 5 – 32 48 1390 M45 1260 1220.0 30 12 12.5 –
1400 1685 52 – – – 145 1530 5 – 36 48 1590 M45 1465 1420.0 30 12 14.2 –
1600 1930 58 – – – 160 1750 5 – 40 56 1820 M52 1668 1620.0 35 12 16.0 –
1800 2130 62 – – – 170 1950 5 – 44 56 2020 M52 1870 1820.0 35 15 17.5 –
2000 2435 66 – – – 190 2150 5 – 48 62 2230 M56 2072 2020.0 40 15 20.0 –

Bs 4504 Pn 10 Flange Dimensions


Nom. Size Flange Raised Face Boss Drilling  

Bolting		 Neck Bore Diameter
DN A C C1 C2 D D1 G X N No. I J M F E R T B
10 90 14 14 14 20 35 40 2 30 4 14 60 M12 28 17.2 6 3 1.8 18.0
15 95 14 14 14 20 35 45 2 35 4 14 65 M12 32 21.3 6 3 2.0 22.0
20 105 16 16 16 24 38 58 2 45 4 14 75 M12 39 26.9 6 4 2.3 27.5
25 115 16 16 16 24 38 68 2 52 4 14 85 M12 46 33.7 6 4 2.6 34.5
32 140 16 18 16 26 40 78 2 60 4 18 100 M16 56 42.4 6 5 2.6 43.5
40 150 16 18 16 26 42 88 3 70 4 18 110 M16 64 48.3 7 5 2.6 49.5
50 165 18 20 18 28 45 102 3 84 4 18 125 M16 74 60.3 8 5 2.9 61.5
65 185 18 20 18 32 45 122 3 104 4 / 8 18 145 M16 92 76.1 10 6 2.9 77.5
80 200 20 20 20 34 50 138 3 118 8 18 160 M16 110 88.9 10 6 3.2 90.5
100 220 20 22 20 40 52 162 3 140 8 18 180 M16 130 114.3 12 6 3.6 116.0
125 * 250 22 22 22 44 55 188 3 168 8 18 210 M16 158 139.7 12 6 4.0 141.5
150 285 22 24 22 44 55 212 3 195 8 22 240 M20 184 168.3 12 8 4.5 170.5
200 340 24 24 24 44 62 268 3 246 8 22 295 M20 234 219.1 16 8 5.6 221.5
250 395 26 26 26 46 68 320 3 298 12 22 350 M20 288 273.0 16 10 6.3 276.5
300 445 26 28 26 46 68 370 4 350 12 22 400 M20 342 323.9 16 10 7.1 327.6
350 505 26 28 26 53 68 430 4 400 16 22 460 M20 390 355.6 16 10 7.1 359.0
400 565 26 32 26 57 72 482 4 456 16 26 515 M24 440 406.4 16 10 7.1 411.0
450 615 28 36 28 63 72 532 4 502 20 26 565 M24 488 457.0 16 12 7.1 462.0
500 670 28 38 28 67 75 585 4 559 20 26 620 M24 540 508.0 16 12 7.1 513.5
600 780 28 42 34 75 80 685 5 658 20 30 725 M27 640 610.0 18 12 7.1 616.5
700 895 30 – 38 – 80 800 5 – 24 30 840 M27 746 711.0 18 12 8.0 –
800 1015 32 – 42 – 90 905 5 – 24 33 950 M30 848 813.0 18 12 8.0 –
900 1115 34 – 46 – 95 1005 5 – 28 33 1050 M30 948 914.0 20 12 10.0 –
1000 1230 34 – 52 – 95 1110 5 – 28 36 1160 M33 1050 1016.0 20 12 10.0 –
1200 1455 38 – 60 – 115 1330 5 – 32 39 1380 M36 1256 1220.0 25 12 11.0 –
1400 1675 42 – – – 120 1535 5 – 36 42 1590 M39 1460 1420.0 25 12 12.0 –
1600 1915 46 – – – 130 1760 5 – 40 48 1820 M45 1666 1620.0 25 12 14.0 –
1800 2115 50 – – – 140 1960 5 – 44 48 2020 M45 1866 1820.0 30 15 15.0 –
2000 2325 54 – – – 150 2170 5 – 48 48 2230 M45 2070 2020.0 30 15 16.0 –
2200 2550 58 – – – 160 2370 6 – 52 56 2440 M52 2275 2220.0 35 15 – –
2400 2760 62 – – – 170 2570 6 – 56 56 2650 M52 2478 2420.0 35 15 – –
2600 2960 65 – – – 180 2780 6 – 60 56 2850 M52 2680 2620.0 40 18 – –
2800 3180 70 – – – 190 3000 6 – 64 56 3070 M52 2882 2820.0 40 18 – –
3000 3405 75 – – – 200 3210 6 – 68 62 M56 3085 3020.0 40 18 – –

Weight chart of Bs 4504 Forged Flange


Standard Class Diameter Bolt Circle Diameter Number of Bolts Bolt Size Diameter of Bolt Hole
AS4087 Flanges PN14 Flanges 95 67 4 M12 14
AS 2129 Flange Table C Flanges 95 67 4 13 14
Table D Flanges 95 67 4 13 14
Table E Flanges 95 67 4 13 14
Table F Flanges 95 67 4 13 14
Table H Flanges 114 83 4 16 17
Table J Flanges 114 83 4 16 17
ANSI B16.5 Flanges ANSI 150 Flanges 89 60 4 13 16
ANSI 300 Flanges 95 67 4 13 16
ANSI 600 Flanges 95 67 4 13 16
ANSI 900 Flanges 121 83 4 19 22
ANSI 1500 Flanges 121 83 4 19 22
BS 4504 (DIN) Flange PN6 Flanges 80 55 4 M10 11
PN10 Flanges 95 65 4 M12 14
PN16 Flanges 95 65 4 M12 14
PN20 Flanges 90 60.5 4 M14 16
PN25 Flanges 95 65 4 M12 14
PN40 Flanges 95 65 4 M12 14

BS 4504 Pipe Flanges Pressure Rating


ASME/ANSI B 16.36 Welding Neck Flange, Slip on Flange, Threaded Flange
PRESSURE CLASS 300, 400, 600, 900, 1500, 2500
ASME/ANSI B 16.5 Welding Neck Flange, Slip on Flange, Blind Flange, High Hub Blind Flange, Socket Weld Flange, Lap Joint Flange, Threaded Flange, Ring Type Joint Flange
PRESSURE CLASS 150, 300, 400, 600, 900, 1500, 2500
ASME/ANSI B 16.47 Welding Neck Flange, Blind Flange [Series A & B]
PRESSURE CLASS 75, 150, 300, 400, 600, 900
BS 4504 SEC 3.1 Welding Neck Flange, Hubbed Slip on Flange, Hubbed Threaded Flange, Lapped Pipe End Flange, Plate Flange, Loose Plate Flange, Loose Plate With Weld Neck Flange, Blank Flange
PRESSURE CLASS PN 2.5 TO PN 40
BS 4504[PART 1] Welding Neck Flange, Hubbed Slip-On Hubbed Threaded, Plate Flange, Loose Plate With Weld On Plate Collar, Blank Flange
PRESSURE CLASS PN 2.5 TO PN 400
BS 1560 BOSS Welding Neck Flange, Socket Welding Flange, Slip-On Flange, Blind Flange, Screwed Boss Flange, Lapped Flange
PRESSURE CLASS 150, 300, 400, 600, 900, 1500, 2500
BS10 Welding Neck Flange, Plate Slip-On Flange, Screwed Boss Flange, Slip-On Boss Flange, Blind Flange
TABLE D, E, F, H
DIN FLANGES DIN 2527, 2566, 2573, 2576, 2641,2642, 2655, 2656, 2627, 2628, 2629, 2631, 2632, 2633, 2634, 2635, 2636, 2637,2638, 2673
PRESSURE CLASS PN 6 TO PN 100

Material of ANSI B16.5 Class 150 BS 4504 Flange


Stainless Steel ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8, CF3, CF8M, CF3M, DIN 1.4301, DIN 1.4306, DIN 1.4401, DIN 1.4404, DIN 1.4308, DIN 1.4408, DIN 1.4306, DIN 1.4409
Carbon Steel ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
Alloy Steel ASTM A182 / ASME SA182 F5, F9, F11, F12, F22, F91
Copper T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910,C10920, TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000,C12200, C12300, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Titanium ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7
ASTM  R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5
Copper Nickel ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Brass 3602 / 2604 / H59 / H62 / etc.
Nickel ASTM B564 / ASME SB564, Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Inconel ASTM B564 / ASME SB564, Inconel 600, 601, 625, 718, 783, 690, x750
Hastelloy ASTM B564 / ASME SB564, Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X Flanges
Monel ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Alloy 20 ASTM B462 / ASME SB462, Carpenter® 20 Alloy, Alloy 20Cb-3
Aluminium 5052 /6061/ 6063 / 2017 / 7075 / etc.
Duplex S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Incoloy ASTM B564 / ASME SB564, Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925 Flanges
254 Smo ASTM A182 / ASME SA182, SMO 254/6Mo, UNS S31254, DIN 1.4547
Nimonic Nimonic 75, Nimonic 80A, Nimonic 90
Other material Tin bronze, Alumunum bronze, Lead bronze

Types of Flanges