Stainless Steel Flanges Exporter | SS 304/316L Weld Neck, Slip-On, Blind Flanges ASME B16.5

ASME B16.5 • ASTM A182

Exporter & Stockist

Stainless Steel Flanges

Rasen Stainless LLP supplies forged stainless steel flanges to ASME B16.5 and B16.47 in weld neck, slip-on, blind, socket weld, lap joint and threaded types, from ½″ NB to 48″ NB and pressure classes 150# through 2500#.

Every flange is forged from ASTM A182 material with the heat number stamped on the rim, machined to the ordered face finish (raised face, flat face or ring type joint) and dispatched with the mill test certificate. Common sizes in SS 304L and 316L are held in ready stock at Mumbai.

01 Specifications

Size Range½″ NB to 48″ NB (15 NB to 1200 NB)

Pressure Class150#, 300#, 400#, 600#, 900#, 1500#, 2500#

StandardsASME B16.5, ASME B16.47 Series A/B, MSS SP-44, DIN, EN 1092-1, JIS, BS 10

TypesWeld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Long Weld Neck, Orifice, Spectacle Blind

Face TypeRaised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove

Material SpecASTM A182 / ASME SA182

Surface FinishSerrated (125–250 AARH), Smooth, Stock finish

TestingHardness, UT, PMI, IGC Practice E, Hydro on request

MarkingSize, class, grade, heat no., standard & brand stamped

02 Grades Available

SS 304 / 304L — F304 / F304LSS 316 / 316L — F316 / F316LSS 316Ti — F316TiSS 321 / 321H — F321SS 347 / 347H — F347SS 310S — F310SS 904L — F904LDuplex 2205 — F51 / F60Super Duplex 2507 — F53 / F55

Grades marked with a light-blue diamond are duplex / super duplex. Other austenitic, ferritic and nickel-alloy grades on request.

03 Dimension Chart

Weld Neck 150#All dimensions in mm as per ASME B16.5. C = flange thickness, X = hub diameter, Y = length through hub, B = bore to match pipe schedule.

NPS	O.D. (mm)	Thk (mm)	Hub Dia X	Neck O.D.	Length Y	RF Dia	PCD	Bolts	Hole Dia
1/2	90	9.6	30	21.3	46	34.9	60.3	4	15.9
3/4	100	11.2	38	26.7	51	42.9	69.9	4	15.9
1	110	12.7	49	33.4	54	50.8	79.4	4	15.9
1 1/4	115	14.3	59	42.2	56	63.5	88.9	4	15.9
1 1/2	125	15.9	65	48.3	60	73	98.4	4	15.9
2	150	17.5	78	60.3	62	92.1	120.7	4	19.1
2 1/2	180	20.7	90	73	68	104.8	139.7	4	19.1
3	190	22.3	108	88.9	68	127	152.4	4	19.1
4	230	22.3	135	114.3	75	157.2	190.5	8	19.1
5	255	22.3	164	141.3	87	185.7	215.9	8	22.2
6	280	23.9	192	168.3	87	215.9	241.3	8	22.2
8	345	27	246	219.1	100	269.9	298.5	8	22.2
10	405	28.6	305	273	100	323.8	362	12	25.4
12	485	30.2	365	323.8	113	381	431.8	12	25.4
14	535	33.4	400	355.6	125	412.8	476.3	12	28.6
16	595	35	457	406.4	125	469.9	539.8	16	28.6
18	635	38.1	505	457.2	138	533.4	577.9	16	31.8
20	700	41.3	559	508	143	584.2	635	20	31.8
24	815	46.1	663	610	151	692.2	749.3	20	34.9

Weld Neck 300#Class 300 flanges per ASME B16.5. Bore machined to ordered pipe schedule.

NPS	O.D. (mm)	Thk (mm)	Hub Dia X	Neck O.D.	Length Y	RF Dia	PCD	Bolts	Hole Dia
1/2	95	12.7	38	21.3	51	34.9	66.7	4	15.9
3/4	115	14.3	48	26.7	56	42.9	82.6	4	19.1
1	125	15.9	54	33.4	60	50.8	88.9	4	19.1
1 1/4	135	17.5	64	42.2	64	63.5	98.4	4	19.1
1 1/2	155	19.1	70	48.3	67	73	114.3	4	22.2
2	165	20.7	84	60.3	68	92.1	127	8	19.1
2 1/2	190	23.9	100	73	75	104.8	149.2	8	22.2
3	210	27	117	88.9	78	127	168.3	8	22.2
4	255	30.2	146	114.3	84	157.2	200	8	22.2
5	280	33.4	178	141.3	97	185.7	235	8	22.2
6	320	35	206	168.3	97	215.9	269.9	12	22.2
8	380	39.7	260	219.1	110	269.9	330.2	12	25.4
10	445	46.1	321	273	116	323.8	387.4	16	28.6
12	520	49.3	375	323.8	129	381	450.8	16	31.8
14	585	52.4	425	355.6	141	412.8	514.4	20	31.8
16	650	55.6	483	406.4	144	469.9	571.5	20	34.9
18	710	58.8	533	457	157	533.4	628.6	24	34.9
20	775	62	587	508	160	584.2	685.8	24	34.9
24	915	68.3	702	610	167	692.2	812.8	24	41.3

Slip-On 150#Slip-on flanges per ASME B16.5 Class 150. Bore approx. pipe O.D. + 1.5 mm.

NPS	O.D. (mm)	Thk (mm)	Hub Dia X	Length Y	RF Dia	PCD	Bolts	Hole Dia
1/2	90	9.6	30	16	34.9	60.3	4	15.9
3/4	100	11.2	38	16	42.9	69.9	4	15.9
1	110	12.7	49	17	50.8	79.4	4	15.9
1 1/4	115	14.3	59	21	63.5	88.9	4	15.9
1 1/2	125	15.9	65	22	73	98.4	4	15.9
2	150	17.5	78	25	92.1	120.7	4	19.1
2 1/2	180	20.7	90	29	104.8	139.7	4	19.1
3	190	22.3	108	30	127	152.4	4	19.1
4	230	22.3	135	33	157.2	190.5	8	19.1
5	255	22.3	164	36	185.7	215.9	8	22.2
6	280	23.9	192	40	215.9	241.3	8	22.2
8	345	27	246	44	269.9	298.5	8	22.2
10	405	28.6	305	49	323.8	362	12	25.4
12	485	30.2	365	56	381	431.8	12	25.4
14	535	33.4	400	57	412.8	476.3	12	28.6
16	595	35	457	64	469.9	539.8	16	28.6
18	635	38.1	505	68	533.4	577.9	16	31.8
20	700	41.3	559	73	584.2	635	20	31.8
24	815	46.1	663	83	692.2	749.3	20	34.9

Slip-On 300#Slip-on flanges per ASME B16.5 Class 300.

NPS	O.D. (mm)	Thk (mm)	Hub Dia X	Length Y	RF Dia	PCD	Bolts	Hole Dia
1/2	95	12.7	38	22	34.9	66.7	4	15.9
3/4	115	14.3	48	25	42.9	82.6	4	19.1
1	125	15.9	54	27	50.8	88.9	4	19.1
1 1/4	135	17.5	64	27	63.5	98.4	4	19.1
1 1/2	155	19.1	70	30	73	114.3	4	22.2
2	165	20.7	84	33	92.1	127	8	19.1
2 1/2	190	23.9	100	38	104.8	149.2	8	22.2
3	210	27	117	43	127	168.3	8	22.2
4	255	30.2	146	48	157.2	200	8	22.2
5	280	33.4	178	51	185.7	235	8	22.2
6	320	35	206	52	215.9	269.9	12	22.2
8	380	39.7	260	62	269.9	330.2	12	25.4
10	445	46.1	321	66	323.8	387.4	16	28.6
12	520	49.3	375	73	381	450.8	16	31.8
14	585	52.4	425	76	412.8	514.4	20	31.8
16	650	55.6	483	83	469.9	571.5	20	34.9
18	710	58.8	533	89	533.4	628.6	24	34.9
20	775	62	587	95	584.2	685.8	24	34.9
24	915	68.3	702	106	692.2	812.8	24	41.3

Blind 150#Blind flanges per ASME B16.5 Class 150. RF height 2 mm for Class 150/300.

NPS	O.D. (mm)	Thk (mm)	RF Dia	PCD	Bolts	Hole Dia
1/2	90	9.6	34.9	60.3	4	15.9
3/4	100	11.2	42.9	69.9	4	15.9
1	110	12.7	50.8	79.4	4	15.9
1 1/4	115	14.3	63.5	88.9	4	15.9
1 1/2	125	15.9	73	98.4	4	15.9
2	150	17.5	92.1	120.7	4	19.1
2 1/2	180	20.7	104.8	139.7	4	19.1
3	190	22.3	127	152.4	4	19.1
4	230	22.3	157.2	190.5	8	19.1
5	255	22.3	185.7	215.9	8	22.2
6	280	23.9	215.9	241.3	8	22.2
8	345	27	269.9	298.5	8	22.2
10	405	28.6	323.8	362	12	25.4
12	485	30.2	381	431.8	12	25.4
14	535	33.4	412.8	476.3	12	28.6
16	595	35	469.9	539.8	16	28.6
18	635	38.1	533.4	577.9	16	31.8
20	700	41.3	584.2	635	20	31.8
24	815	46.1	692.2	749.3	20	34.9

Blind 300#Blind flanges per ASME B16.5 Class 300. Higher classes (600# to 2500#) available on request.

NPS	O.D. (mm)	Thk (mm)	RF Dia	PCD	Bolts	Hole Dia
1/2	95	12.7	34.9	66.7	4	15.9
3/4	115	14.3	42.9	82.6	4	19.1
1	125	15.9	50.8	88.9	4	19.1
1 1/4	135	17.5	63.5	98.4	4	19.1
1 1/2	155	19.1	73	114.3	4	22.2
2	165	20.7	92.1	127	8	19.1
2 1/2	190	23.9	104.8	149.2	8	22.2
3	210	27	127	168.3	8	22.2
4	255	30.2	157.2	200	8	22.2
5	280	33.4	185.7	235	8	22.2
6	320	35	215.9	269.9	12	22.2
8	380	39.7	269.9	330.2	12	25.4
10	445	46.1	323.8	387.4	16	28.6
12	520	49.3	381	450.8	16	31.8
14	585	52.4	412.8	514.4	20	31.8
16	650	55.6	469.9	571.5	20	34.9
18	710	58.8	533.4	628.6	24	34.9
20	775	62	584.2	685.8	24	34.9
24	915	68.3	692.2	812.8	24	41.3