BS 4504 Flanges | PN6-PN40 | EN 1092-1

BS 4504 flanges are British Standard metric flanges trusted across European and international piping systems. The standard is largely harmonized with EN 1092-1, and it remains a key reference for circular flanges used with pipes, valves, fittings, and accessories. BS 4504 covers PN-designated pressure ratings from PN 2.5 up to PN 40, with higher ratings in certain series, and nominal sizes that run from DN 10 to DN 3600 and beyond. It specifies several flange types, including Plate (Type 01), Weld Neck (Type 11), Slip-On (Type 12), Blind (Type 05), Threaded, and Lapped Joint, so they fit a wide spread of industrial work. PM Industries manufactures, supplies, and stocks these flanges in a full range of grades, sizes, and pressure ratings.

We supply BS 4504 flanges in carbon steel, stainless steel, and alloy materials, which gives you real flexibility from job to job. Common classes such as PN 6, PN 10, PN 16, PN 25, and PN 40 cover everything from low-pressure water lines to higher-pressure process piping. The standard pins down dimensions, bolt hole patterns, flange thicknesses, hub details, and face finishes (Raised Face and Flat Face), so the joint stays leak-free when matched with the right gasket and bolting. The design keeps alignment simple, holds a strong seal, and lasts under thermal cycling and mechanical stress.

You will find BS 4504 flanges in chemical processing, oil and gas, power generation, water treatment, HVAC, and shipbuilding. Their metric basis makes them a natural choice anywhere British or European engineering practice is followed. The standard supports high weldability and material traceability, which matters most in critical service where safety and compliance come first. Many manufacturers dual-certify to both BS 4504 and EN 1092-1 for wider acceptance, and we can supply dual-certified material on request.

PM Industries keeps a deep stock of BS 4504 flanges in various grades, sizes, and pressure ratings, ready for quick dispatch. Every flange ships with certification and test documentation to match your project spec. Need standard carbon steel slip-on flanges for general service, or stainless steel weld neck flanges for corrosive lines? We carry both. Tell us your type, size, class, face, and material, and we will quote it with expert guidance and competitive pricing.

Specification BS 4504 Flanges

Standards	ANSI/ASME B16.5, B16.48, ANSI Flanges, GOST Flanges, DIN Flanges, EN-1092, B16.47 Series A & B, ASME Flanges, EN Flanges, AWWA Flanges, BS Flanges.
JIS Standard	5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
DIN FLANGES	DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566, 2641, 2637, 2655, 2634, 2636, 2632, 2633, 2638, 2642, 2573, 2635.
Pressure Rating	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Types	Threaded, Plate, Screwed, Forged.
Supporting material	Gasket, Ring Joint, Flange Bolts
Size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
Production technique	Forged, machined and Heat treated
Available Flange Type	Weld Neck Flanges, RTJ Flanges, Slip On Flanges, Spectacle Blind Flanges, Flanges Gaskets, Square Flanges, Standard Insert Flanges, High Hub Blinds Flanges, Flat Flanges, forged flanges, Weldo / Nipo Flanges, Jacket Insert Flanges, Tongue groove Flanges, Blind Flanges, Socket Weld Flanges, Large diameter Flanges, Long Weld Neck Flanges, Spacer Blinds, SWRF Flanges, SORF Flanges, Angle Face Rings Flanges, Spades Ring Spacers Flanges, WNRF Flanges, Screwed Flanges, Insert Flanges, flanges bolts, cf flange, Lap Joint Flanges, ASME B16.36 Orifice Flanges, Plate Flange, Expander Flanges, Ring Type Joint Flanges, Loose Flanges, Reducing Flanges, puddle flange, Threaded Flanges, blank flange, vacuum flange.
Connect Type/ Flange Face Type	Ring Type Joint (RTJ), Flat Face (FF), Tongue & Groove, Small Male-Female (SMF), Lap-Joint Face (LJF), Raised Face (RF), Large Male-Female (LMF), Small Tongue.
Custom design	As per your drawing
Test	Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine.
Origin	Indian / USA / Korean / West Europe / Japan
Pressure Class	PN 6 TO PN 100
Thickness	Normal Pipe Size ≤ 18
Bore Diameter	Normal Pipe ≤ 10
High Temperature	Above 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low Temperature	Above -29 Degree C (−20°F)
Coating/Surface Treatment:	Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized.
European/African/Russian Standard Flanges	Available
Gaskets Types	Full Face, Metallic Ring, Flat Ring Gasket
Marking Standard	Name of Manufacturer
	Schedule
	Type of Flange Facing
	Pressure Class
	Nominal Pipe Size, etc
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
	Raw Materials Certificate
	100% Radiography Test Report
	Third Party Inspection Report, etc

Flange Type Available

Bs 4504 Pn 6 Flange Dimensions

DN	D	C1	C2	H1	H2	H3	R	A	N1	N2	B1	d1	f1
10	90	14	14	20	35	6	3	17,2	28	30	18	40	2
15	95	14	14	20	35	6	3	21,3	32	35	22	45	2
20	105	14	14	24	38	6	4	26,9	39	45	27,5	58	2
25	115	16	16	24	38	6	4	33,7	46	52	34,5	68	2
32	140	18	16	26	40	6	5	42,4	56	60	43,5	78	2
40	150	18	16	26	42	7	5	48,3	64	70	49,5	88	3
50	165	20	18	28	45	8	5	60,3	74	84	61,5	102	3
65	185	20	18	32	45	10	6	76,1	92	104	77,5	122	3
80	200	20	20	34	50	10	6	88,9	110	118	90,5	138	3
100	220	22	20	40	52	12	6	114,3	130	140	116	162	3
125	250	22	22	44	55	12	6	139,7	158	168	141,5	188	3
150	285	24	22	44	55	12	8	168,3	184	195	170,5	212	3
200	340	26	24	44	62	16	8	219,1	234	246	221,5	268	3
250	405	29	26	46	70	16	10	273	288	298	276,5	320	3
300	460	32	28	46	78	16	10	323,9	342	350	327,5	378	4
350	520	35	30	57	82	16	10	355,6	390	400	359	438	4
400	580	38	32	63	85	16	10	406,4	444	456	411,0	490	4
450	640	42	34	68	87	16	12	457,0	490	502	462,0	550	4
500	715	46	34	73	90	16	12	508,0	546	559	513,5	610	4
600	840	52	36	83	95	18	12	610,0	650	658	616,5	725	5
700	910	60	36	83	100	18	12	711,0	750	760	–	795	5
800	1025	68	38	90	105	20	12	813,0	848	864	–	900	5
900	1125	76	40	94	110	20	12	914,0	948	968	–	1000	5
1000	1255	84	42	100	120	22	12	1016,0	1056	1072	–	1115	5
1200	1485	98	48	–	130	30	12	1220,0	1260	–	–	1330	5
1400	1685	–	52	–	145	30	12	1420,0	1465	–	–	1530	5
1600	1930	–	58	–	160	35	12	1620,0	1668	–	–	1750	5
DN	D	C1	C2	H1	H2	H3	R	A	N1	N2	B1	d1	f1

Bs 4504 Pn 10 Flange Dimensions Standards

DN	D	C1	C2	H1	H2	H3	R	A	N1	N2	B1	d1	f1
10	90	14	14	20	35	6	3	17,2	28	30	18	40	2
15	95	14	14	20	35	6	3	21,3	32	35	22	45	2
20	105	14	14	24	38	6	4	26,9	39	45	27,5	58	2
25	115	16	16	24	38	6	4	33,7	46	52	34,5	68	2
32	140	18	16	26	40	6	5	42,4	56	60	43,5	78	2
40	150	18	16	26	42	7	5	48,3	64	70	49,5	88	3
50	165	20	18	28	45	8	5	60,3	74	84	61,5	102	3
65	185	20	18	32	45	10	6	76,1	92	104	77,5	122	3
80	200	20	20	34	50	10	6	88,9	110	118	90,5	138	3
100	220	22	20	40	52	12	6	114,3	130	140	116	162	3
125	250	22	22	44	55	12	6	139,7	158	168	141,5	188	3
150	285	24	22	44	55	12	8	168,3	184	195	170,5	212	3
200	340	26	24	44	62	16	8	219,1	234	246	221,5	268	3
250	405	29	26	46	70	16	10	273	288	298	276,5	320	3
300	460	32	28	46	78	16	10	323,9	342	350	327,5	378	4
350	520	35	30	57	82	16	10	355,6	390	400	359	438	4
400	580	38	32	63	85	16	10	406,4	444	456	411,0	490	4
450	640	42	34	68	87	16	12	457,0	490	502	462,0	550	4
500	715	46	34	73	90	16	12	508,0	546	559	513,5	610	4
600	840	52	36	83	95	18	12	610,0	650	658	616,5	725	5
700	910	60	36	83	100	18	12	711,0	750	760	–	795	5
800	1025	68	38	90	105	20	12	813,0	848	864	–	900	5
900	1125	76	40	94	110	20	12	914,0	948	968	–	1000	5
1000	1255	84	42	100	120	22	12	1016,0	1056	1072	–	1115	5
1200	1485	98	48	–	130	30	12	1220,0	1260	–	–	1330	5
1400	1685	–	52	–	145	30	12	1420,0	1465	–	–	1530	5
1600	1930	–	58	–	160	35	12	1620,0	1668	–	–	1750	5
DN	D	C1	C2	H1	H2	H3	R	A	N1	N2	B1	d1	f1

Bs 4504 Pn16 Flange Dimensions Chart

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 Flange Weight Chart

Nominal pipe diameter in Inch		Outer Diameter Flange	Thickness	Diameter of Hub	Diameter of Raised Face	Length	Thread Length	KG	LB
1	25	108.00	14.20	49.30	50.80	17.50	17.50	0.8	1.8
1/2	15	89.00	11.20	30.20	35.10	15.70	15.70	0.4	0.9
1-1/4	32	117.50	15.70	58.70	63.50	20.60	20.60	1.2	2.6
1-1/2	40	127.00	17.50	65.00	73.20	22.40	22.40	1.5	3.3
3/4	20	98.50	12.70	38.10	42.90	15.70	15.70	0.7	1.5
6	150	279.50	25.40	192.00	215.90	39.60	39.60	8.4	18.5
3	80	190.50	23.90	108.00	127.00	30.20	30.20	4.1	9
2-1/2	65	178.00	22.40	90.40	104.60	28.40	28.40	3.7	8.1
3-1/2	90	216.00	23.90	122.20	139.70	31.80	31.80	5.1	11.2
2	50	152.50	19.10	77.70	91.90	25.40	25.40	2.3	5.1
4	100	228.50	23.90	134.90	157.20	33.30	33.30	5.9	13
5	125	254.00	23.90	163.60	185.70	36.60	36.60	7	15.4
8	200	343.00	28.40	246.10	269.70	44.50	44.50	13	28.6
14	350	533.50	35.10	400.10	412.80	57.20	57.20	39	86
10	250	406.50	30.20	304.80	323.90	49.30	49.30	18	39.5
20	500	698.50	42.90	558.80	584.20	73.20	73.20	76	167
24	600	813.00	47.80	663.40	692.20	82.60	82.60	97	214
16	400	597.00	36.60	457.20	469.90	63.50	63.50	47	103
12	300	482.50	31.80	365.30	381.00	55.60	55.60	29	64
18	450	635.00	39.60	505.00	533.40	68.30	68.30	57	126

Pressure Rating Chart Of Bs 4504 Pn10 Flange

Temperature (F°)	150 LB	300 LB	400 LB	600 LB	900 LB	1500 LB	2500 LB
-20 to 100	285	740	985	1480	2220	3705	6170
300	230	655	870	1310	1965	3270	5450
850	65	320	425	640	955	1595	2655
400	200	635	845	1265	1900	3170	5280
500	170	605	805	1205	1810	3015	5025
600	140	570	755	1135	1705	2840	4730
650	125	550	730	1100	1650	2745	4575
200	260	680	905	1360	2035	3395	5655
700	110	530	710	1060	1590	2655	4425
750	95	505	675	1015	1520	2535	4230
1000	20	85	115	170	255	430	715
800	80	410	550	825	1235	2055	3430
900	50	230	305	460	690	1150	1915
950	35	135	185	275	410	685	1145