Korean Standard Flange| KS B1503 5k, 10k, 16k, 20k Flange

Korean Standard Flanges, KS B1503 5k, 10k, 16k, 20k Flange

Korean standard flanges are a critical component in industrial piping systems, known for their high-quality manufacturing and precision engineering. These flanges adhere to international standards like JIS (Japanese Industrial Standards) and KS (Korean Standards), ensuring reliability and performance in various applications, Korean standard flanges are designed to withstand high-pressure, high-temperature, and corrosive environments. With stringent quality control measures in place, these flanges offer excellent sealing properties, making them ideal for securing piping connections and ensuring system integrity. Whether it’s weld neck, slip-on, or blind flanges, Korean standard flanges provide exceptional durability, precision, and cost-efficiency for a wide range of industries.

Ample Alloys is a leading manufacturer and supplier of Korean standard flanges, offering high-quality products that adhere to both JIS (Japanese Industrial Standards) and KS (Korean Standards). With years of experience in the industry, we provide a comprehensive range of flanges including weld neck, slip-on, blind, and threaded options, tailored to meet the demands of various industrial applications. At Ample Alloys, we are committed to providing reliable, cost-effective solutions with on-time delivery and unparalleled customer support. Whether you're working in oil & gas, petrochemical, power generation, or any other industry, Ample Alloys is your trusted partner for all your Korean flange needs.

KOSHA certified flanges, Korean forged flanges, Korean pipe flanges, KSA flanges, Korean custom flanges, Carbon steel Korean flanges, JIS Korean flanges, Ks B1503 Blind Flange and Ks B1503 Slip On Flange

Korean steel flanges Specifications

Size Range

15mm ( 1/2" NPS ) up to 1200 mm ( 48" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Flange Face Type

Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ)

Stainless Steel

ASTM A182 F 304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.

Standards / Dimension

KS B 1501, KS D 1501, JIS B2220

Carbon Steel

ASTM A105/A105N (SA105N), LTCS A350 LF2, A694

Alloy Steel

ASTM A182 / SA182 - F1 / F5 / F9 / F11 / F12 / F22 / F91

Pressure Class

Class 150, Class 300, Class 600, Class 900, Class 1500 and Class 2500.

Duplex & Super Duplex

ASTM A182 / ASME SA182 - S31803, S32205, 2205, S32750, S32760, S32950, 2507.

MTC

EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103

KS B1503 5k Flange - Dimensions

Nominal Diameter of Flanges	Outside Diameter of Flanges D	flange Sectional Dimensions												Size Of Bolt	Welding
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside Dia. Of Flange do	Outside Diameter Of Applicable pipe	t	T	Hub Diameter		Radius r	Raised Face f	Hole Diameter Of H	Bolt Holes Number		Welding
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside Dia. Of Flange do	Outside Diameter Of Applicable pipe	t	T	a	b	Radius r	Raised Face f	Hole Diameter Of H	Bolt Holes Number		W1	W2
10	75	55	39	17.8	17.3	9	–	–	–	–	1	12	4	M10	5	2.5
15	80	60	44	22.2	21.7	9	–	–	–	–	1	12	4	M10	5	3
20	85	65	49	27.7	27.2	10	–	–	–	–	1	12	4	M10	5	3
25	95	75	59	34.5	34	10	–	–	–	–	1	12	4	M10	5	3
32	115	90	70	43.2	42.7	12	–	–	–	–	2	15	4	M12	6	3
40	120	95	75	49.1	48.6	12	–	–	–	–	2	15	4	M12	6	3
50	130	105	85	61.1	60.5	14					2	15	4	M12	6	3
65	155	130	110	77.1	76.3	14					2	15	4	M12	6	4
80	180	145	121	90	89.1	14					2	19	4	M16	6	4
90	190	155	131	102.6	101.6	14					2	19	4	M16	6	4
100	200	165	141	115.4	114.3	16					2	19	8	M16	7	4
125	235	200	176	141.2	139.8	16					2	19	8	M16	7	4
150	265	230	206	166.6	165.2	18					2	19	8	M16	7	5
175	300	260	232	192.1	190.7	18					2	23	8	M20	7.5	5
200	320	280	252	218	216.3	20					2	23	8	M20	8.5	6
225	345	305	277	243.7	241.8	20					2	23	12	M20	9	6
250	385	345	317	269.5	267.4	22					2	23	12	M20	10	6
300	430	390	360	321	318.5	22					3	23	12	M20	10	6
350	480	435	403	358.1	355.6	24					3	25	12	M22	12	7
400	540	495	463	409	406.4	24					3	25	16	M22	12	7
450	605	555	523	460	457.2	24	40	495	500	5	3	25	16	M22	12	7
500	655	605	573	511	508	24	40	546	552	5	3	25	20	M22	12	7
550	720	665	630	562	558.8	26	42	597	603	5	3	27	20	M24	12	7
600	770	715	680	613	609.6	26	44	648	654	5	3	27	20	M24	12	7
650	825	770	735	664	660.4	26	48	702	708	5	3	27	24	M24	12	7
700	875	820	785	715	711.2	26	48	751	758	5	3	27	24	M24	12	7
750	945	880	840	766	762	28	52	802	810	5	3	33	24	M30	12	7
800	995	930	890	817	812.8	28	52	854	862	5	3	33	24	M30	13	8
850	1045	980	940	868	863.6	28	54	904	912	5	3	33	24	M30	13	8
900	1095	1030	990	919	914.4	30	56	956	964	5	3	33	24	M30	13	8
1000	1195	1130	1090	1021	1016	32	60	1058	1066	5	3	33	28	M30	14	9
*(1100)	1305	1240	1200	1123	1117.6	32					3	33	28	M30
*1200	1420	1350	1305	1225	1219.2	34			–	–	3	33	32	M30
*1350	1575	1505	1460	–	1371.6	34	–	–	–	–	3	33	32	M30
*1500	1730	1660	1615	–	1524	36	–	–	–	–	3	33	36	M30

KS B1503 10k Flange - Dimensions

Nominal Diameter of Flanges	Outside Diameter of Flanges D	flange Sectional Dimensions												Size Of Bolt	Welding
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside DaimeterOf Flange do	O.D. Of Applicable pipe	t	T	Hub Diameter		Radius r	Raised Face f	Hole Diameter Of H	Bolt Holes Number		Welding
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside DaimeterOf Flange do	O.D. Of Applicable pipe	t	T	a	b	Radius r	Raised Face f	Hole Diameter Of H	Bolt Holes Number		W1	W2
10	90	65	46	17.8	17.3	12	–	–	–	–	1	15	4	M12	5	2.5
15	95	70	51	22.2	21.7	12	–	–	–	–	1	15	4	M12	5	3
20	100	75	56	27.7	27.2	14	–	–	–	–	1	15	4	M12	5	3
25	125	90	67	34.5	34	14	–	–	–	–	1	19	4	M16	5	3
32	135	100	76	43.2	42.7	16	–	–	–	–	2	19	4	M16	6	3
40	140	105	81	49.1	48.6	16	–	–	–	–	2	19	4	M16	6	3
50	155	120	96	61.1	60.5	16	–	–	–	–	2	19	4	M16	6	3
65	175	140	116	77.1	76.3	18	–	–	–	–	2	19	4	M16	6.5	4
80	185	150	126	90	89.1	18	–	–	–	–	2	19	8	M16	6.5	4
-90	195	160	136	102.6	101.6	18	–	–	–	–	2	19	8	M16	6.5	4
100	210	175	151	115.4	114.3	18	–	–	–	–	2	19	8	M16	7	4
125	250	210	182	141.2	139.8	20	–	–	–	–	2	23	8	M20	7.5	4
150	280	240	212	166.6	165.2	22	–	–	–	–	2	23	8	M20	8	5
-175	305	265	237	192.1	190.7	22	–	–	–	–	2	23	12	M20	9	5
200	330	290	262	218	216.3	22	–	–	–	–	2	23	12	M20	9	6
-255	350	310	282	243.7	241.8	22	–	–	–	–	2	23	12	M20	9	6
250	400	355	324	269.5	267.4	24	36	288	292	6	2	25	12	M22	10	6
300	445	400	368	321	318.5	24	38	340	346	6	3	25	16	M22	10	6
350	490	445	413	358.1	355.6	26	42	380	386	6	3	25	16	M22	12	7
400	560	510	475	409	406.4	28	44	436	442	6	3	27	16	M24	12	7
450	620	565	530	460	457.2	30	48	496	502	6	3	27	20	M24	14	8
500	675	620	585	511	508	30	48	548	554	6	3	27	20	M24	14	8
550	745	680	640	562	558.8	32	52	604	610	6	3	33	20	M30	15	9
600	795	730	690	613	609.6	32	52	656	662	6	3	33	24	M30	16	10
650	845	780	740	664	660.4	34	56	706	712	6	3	33	24	M30	16	10
700	905	840	800	715	711.2	34	58	762	770	6	3	33	24	M30	17	10
750	970	900	855	766	762	36	62	816	824	6	3	33	24	M30	18	11
800	1020	950	905	817	812.8	36	64	868	876	6	3	33	28	M30	19	12
-850	1070	1000	955	868	863.6	36	66	920	928	6	3	33	28	M30	19	12
900	1120	1050	1005	919	914.4	38	70	971	979	6	3	33	28	M30	22	14
1000	1235	1160	1110	1021	1016	40	74	1073	1081	6	3	39	28	M36	22	14
*(1100)	1345	1270	1220	1123	1117.6	42	–	–	–	–	3	39	28	M36
*1200	1465	1380	1325	1225	1219.2	44	–	–	–	–	3	39	32	M36
*1350	1630	1540	1480	–	1371.6	48	–	–	–	–	3	45	36	M42
*1500	1795	1700	1635	–	1524	50	–	–	–	–	3	45	40	M42

KS B1503 16k Flange - Dimensions

Nominal Diameter of Flanges	Outside Diameter of Flanges D	flange Sectional Dimensions												Size Of Bolt
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside DaimeterOf Flange do	O.D. Of Applicable pipe	t	T	Hub Diameter		Radius r	Raised Face f	Hole Diameter Of H	Bolt Holes Number
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside DaimeterOf Flange do	O.D. Of Applicable pipe	t	T	a	b	Radius r	Raised Face f	Hole Diameter Of H	Bolt Holes Number
10	90	65	46	17.8	17.3	12	16	26	28	4	1	15	4	M12
15	95	70	51	22.2	21.7	12	16	30	32	4	1	15	4	M12
20	100	75	56	27.7	27..2	14	20	38	42	4	1	15	4	M12
25	125	90	67	34.5	34	14	20	46	50	4	1	19	4	M16
32	135	100	76	43.2	42.7	16	22	56	60	5	2	19	4	M16
40	140	105	81	49.1	48.6	16	24	62	66	5	2	19	4	M16
50	155	120	96	61.1	60.5	16	24	76	80	5	2	19	8	M16
65	175	140	116	77.1	76.3	18	26	94	98	5	2	19	8	M16
80	200	160	132	90	89.1	20	28	108	112	6	2	23	8	M20
-90	210	170	145	102.6	101.6	20	30	120	124	6	2	23	8	M20
100	225	185	160	115.4	114.3	22	34	134	138	6	2	23	8	M20
125	270	225	195	141.2	139.8	22	34	164	170	6	2	25	8	M22
150	305	260	230	166.6	165.2	24	38	196	202	6	2	25	12	M22
200	350	305	275	218	216.3	26	40	244	252	6	2	25	12	M22
250	430	380	345	269.5	267.4	28	44	304	312	6	2	27	12	M24
300	480	430	395	321	318.5	30	48	354	364	8	3	27	16	M24
350	540	480	440	358.1	355.6	34	52	398	408	8	3	33	16	M30X3
400	605	540	495	409	406.4	38	60	446	456	10	3	33	16	M30X3
450	675	605	560	460	457.2	40	64	504	514	10	3	33	20	M30X3
500	730	660	615	511	508	42	68	558	568	10	3	33	20	M30X3
-550	795	720	670	562	558.8	44	70	612	622	10	3	39	20	M36X3
600	845	770	720	613	609.6	46	74	666	676	10	3	39	24	M36X3
-650	895	820	770	664	660.4	48	77	704	726	10	5	39	24	M36X3
700	960	875	820	715	711.2	50	80	754	776	10	5	42	24	M39X3
-750	1020	935	880	766	762	52	83	806	832	10	5	42	24	M39X3
800	1085	990	930	817	812.8	54	86	865	885	10	5	48	24	M45X3
-850	1135	1040	980	868	863.6	56	89	916	936	10	5	48	24	M45X3
900	1185	1090	1030	919	914.4	58	93	968	986	10	5	48	28	M45X3
1000	1320	1210	1140	1021	1016	62	99	1070	1098	12	5	56	28	M52X3
-1100	1420	1310	1240	1123	1117.6	66	105	1180	1200	12	5	56	32	M52X3
1200	1530	1420	1350	1225	1219.2	70	112	1282	1302	12	5	56	32	M52X3

KS B1503 20k Flange - Dimensions

Nominal Diameter of Flanges	Outside Diameter of Flanges D	flange Sectional Dimensions														Reference
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside DaimeterOf Flanges do	O.D. of Steel pipe	t	T	Hub Diameter		Radius r	f	D	Bolt Holes Number	Holes Dia. H	SIZE Of Bolt	S1	M	S2	N	L
		Diameter of Bolt Circle C	Diameter Of raised Face g	Inside DaimeterOf Flanges do	O.D. of Steel pipe	t	T	a	b	Radius r	f	D	Bolt Holes Number	Holes Dia. H	SIZE Of Bolt	S1	M	S2	N	L
10	90	65	46	17.8	17.3	14	20	30	32	4	1	–	4	15	M12	27	4	27	4	–
15	95	70	51	22.2	21.7	14	20	34	36	4	1	–	4	15	M12	31	4	31	4	–
20	100	75	56	27.7	27.2	16	22	40	42	4	1	–	4	15	M12	37	4	37	4	–
25	125	90	67	34.5	34	16	24	48	50	4	1		4	19	M16	44	4	44	4.5	–
32	135	100	76	43.2	42.7	18	26	56	60	5	2	–	4	19	M16	52	4	53	5	–
40	140	105	81	49.1	48.6	18	26	62	66	5	2	–	4	19	M16	58	4	59	5.5	–
50	155	120	96	61.1	60.5	18	26	76	80	5	2	–	8	19	M16	70	4	72	5.5	–
65	175	140	116	77.7	76.3	20	30	100	104	5	2	65.9	8	19	M16	94	6	–	–	6
80	200	160	132	90	89.1	22	34	113	117	6	2	78.1	8	23	M20	107	6	–	–	6
-90	210	170	145	102.6	101.6	24	36	126	130	6	2	90.2	8	23	M20	120	6	–	–	6
100	225	185	160	115.4	114.3	24	36	138	142	6	2	102.3	8	23	M20	132	6	–	–	6
125	270	225	195	141.2	139.8	26	40	166	172	6	2	126.6	8	25	M22	160	7	–	–	6
150	305	260	230	166.6	165.2	28	42	196	202	6	2	151	12	25	M22	186	8	–	–	6
200	350	305	275	218	216.3	30	46	244	252	6	2	199.9	12	25	M22	237	9	–	–	6
250	430	380	345	269.5	267.4	34	52	304	312	6	2	248.8	12	27	M24	290	10	–	–	6
300	480	430	395	321	318.5	36	56	354	364	8	3	297.9	16	27	M24	345	11	–	–	6
350	540	480	440	358.1	355.6	40	62	398	408	8	3	333.4	16	33	M30X3	384	12	–	–	6
400	605	540	495	409	406.4	46	70	446	456	10	3	381	16	33	M30X3	437	13	–	–	7
450	675	605	560	460	457.2	48	78	504	514	10	3	431.8	20	33	M30X3	490	15	–	–	7
500	730	660	615	511	508	50	84	558	568	10	3	482.6	20	33	M30X3	544	16	–	–	7
-550	795	720	670	562	558.8	52	90	612	622	10	3	533.4	20	39	M36X3	595	16	–	–	7
600	845	770	720	613	609.6	54	96	666	676	10	3	584.2	24	39	M36X3	646	18	–	–	7
*650	945	850	790	664	660.4	60					5		24	48	M45X3
*700	995	900	840	715	711.2	64					5		24	48	M45X3
*750	1080	970	900	766	762	68					5		24	56	M52X3
*800	1140	1030	960	817	812.8	72					5		24	56	M52X3
*850	1200	1090	1020	868	863.6	74					5		24	56	M52X3
*900	1250	1140	1070	919	914.4	76					5		28	56	M52X3

Korean industrial flanges Standards

Korean industrial flanges are governed by several standards that ensure their compatibility, durability, and performance in various industrial applications. These standards are primarily set by Korean Standards (KS) and align with JIS (Japanese Industrial Standards) for many flange types. The key Korean industrial flange standards include:

KS B 1501 - Steel Flanges
Covers design, dimensions, and material requirements for steel flanges used in pressure piping systems. Common types include weld neck, slip-on, blind, and socket weld flanges, primarily used in oil & gas, petrochemical, and power industries.
KS D 1501 - Flanges for Gas Pipelines
Specifies materials and pressure ratings for flanges used in gas pipelines to ensure secure seals and reliable performance.
JIS B 2220 - Flanges for Pipes
Defines flange dimensions, materials, and pressure ratings, closely aligning with ASME B16.5. Types include weld neck, slip-on, blind, threaded, and socket weld, with pressure classes like 150, 300, and 600.
KS B 1502 - Cast Iron Flanges
Focuses on cast iron flanges for moderate pressure systems, typically used in water, sewage, and other lower-pressure fluids.
JIS B 2311 - Flanges for High-Pressure Applications
Specifies flanges designed to withstand high pressure and temperature, used in critical systems in oil, gas, and petrochemical industries.
KS F 5103 - Stainless Steel Flanges
Details material and performance requirements for stainless steel flanges, ideal for high-corrosion environments in industries like chemical processing and pharmaceuticals.

Why Ample Alloys For Korean weld neck flanges !

Adherence to Korean Standards

Ample Alloys ensures all Korean flanges meet the rigorous standards such as KS B 1501, KS D 1501, and JIS B 2220. Our flanges are designed to meet specific dimensional, material, and pressure class requirements, ensuring reliability and durability in industrial applications.

Wide Range of Flanges

We offer a comprehensive range of Korean flanges, including weld neck, slip-on, blind, and socket weld flanges, designed for various industries such as oil & gas, petrochemical, and power generation.

Proven Industry Expertise

With years of experience in manufacturing and supplying industrial flanges, Ample Alloys has built a reputation for delivering quality products and solutions tailored to our clients' needs.

Competitive Pricing and Timely Delivery

We offer cost-effective pricing without compromising on quality, ensuring your project stays within budget. Our efficient manufacturing and logistics systems ensure on-time delivery.

What types of Korean flanges are available?

Weld neck flanges
Slip-on flanges
Blind flanges
Socket weld flanges
Threaded flanges

Are Korean flanges compatible with other international standards?

Yes, Korean flanges are often compatible with other international standards, such as ASME and DIN, due to the similarities in their design, dimensions, and pressure class ratings. However, it’s important to verify compatibility for specific applications.

Can Korean flanges be customized?

Yes, Korean flanges can be customized in terms of size, material, and pressure class to meet the specific needs of your project. Whether you require custom dimensions, higher pressure ratings, or special material grades, manufacturers like Ample Alloys can accommodate your requests.