Flanges

Full range of industrial flanges in SS, CS, alloy steel, and duplex — from weldneck to orifice flanges in all pressure classes.

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Stainless Steel Flanges

Manufacturer, Supplier & Stockist

Swastik Metal Industries is one of the leading manufacturers, suppliers and stockists of Flanges in India. Full range of industrial flanges in SS, CS, alloy steel, and duplex — from weldneck to orifice flanges in all pressure classes.

As one of India’s trusted flanges suppliers, we offer a complete range including Weldneck, Slip-on, Blind, Socket Weld, Lap Joint, Spectacle, Ring Joint, Orifice, Long Weldneck, Deck, and RTJ flanges. Available in stainless steel, carbon steel, and alloy steel grades. We stock flanges from 1/2 inch to 24 inch NB in pressure classes 150# to 2500#. Our flanges are manufactured to ASME B16.5, B16.47, and DIN standards with complete dimensional compliance.

ISO 9001:2015 Certified

Pan-India Delivery

Material Test Certificates

Call: +91 76660 05007

Specifications & Grades

Stainless SteelASTM A182 F304/304L/304H/316/316L/317/317L/321/310/347/904L

Carbon SteelASTM A105 / A694 F42/46/52/56/60/65/70 / A350 LF3 / A350 LF2

Alloy SteelASTM A182 F1/F5/F9/F11/F22/F91

DuplexUNS S31803, S32750, S32760, 904L, Alloy 20

OthersMonel, Nickel, Inconel, Hastelloy, Copper, Brass, Bronze, Titanium, Tantalum, Bismuth, Aluminium

TypesWeldneck, Slipon, Blind, Socket Weld, Lap Joint, Spectacles, Ring Joint, Orifice, Long Weldneck, Deck Flange, RTJ

Size1/2" NB to 24" NB

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

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Dimensional Specification Tables8 tables

Dimensions of Class 150 Flanges

NPS	O.D. of Flange (O)	Thickness of Flange Min. (t1)	Thickness Lap Joint Min. (t1)	Dia. of Bolt Circle (W)	Dia. of Bolt Holes	No. of Bolts	Dia. of Hub (A)	Hub Dia. Beginning of Chamfer Weld Neck (Y)	Threaded/Slip-On/Socket Welding (Y)	Lapped (Y)	Welding (Y)	Threaded/Length Threaded Min. (B)	Slip-On/Socket Welding Min. (B)	Lapped Min. (B)	Welding Neck/Socket (B Note 2)	Corner Radius of Bore Lapped Flange & Pipe (R)	Depth of Socket (D)	Dia. of RF (R)
1/2	90	9.6	11.2	60.3	15.9	4	30	21.3	14	16	46	16	22.2	22.2	22.9	15.8	3	10
3/4	100	11.2	12.7	6.9	15.9	4	38	26.7	14	16	51	16	27.7	27.7	28.2	20.9	3	11
1	110	12.7	14.3	79.4	15.9	4	49	33.4	16	17	54	17	34.5	34.5	34.9	26.6	3	13
1 1/4	115	14.3	15.9	88.9	15.9	4	59	42.2	19	21	56	21	43.2	43.2	43.7	35.1	5	14
1 1/2	125	15.9	17.5	98.4	15.9	4	65	48.3	21	22	60	22	49.5	49.5	50.0	40.9	6	16

Dimensions of Class 300 Flanges

NPS	O.D. of Flange (O)	Thickness of Flange Min. (t1)	Thickness Lap Joint Min. (t1)	Dia. of Bolt Circle (W)	Dia. of Bolt Holes	No. of Bolts	Dia. of Hub (A)	Hub Dia. Beginning of Chamfer Weld Neck (Y)	Threaded/Slip-On/Socket (Y)	Lapped (Y)	Welding (Y)	Threaded/Length Threaded Min. (B)	Slip-On/Socket Welding Min. (B)	Lapped Min. (B)	Welding Neck/Socket (B)	Corner Radius Lapped Flange (R)	Depth of Socket (D)	Dia. of RF (R)
1/2	95	12.7	14.3	66.7	15.9	4	38	21.3	21	22	51	16	22.2	22.2	22.9	15.8	3	23.6
3/4	115	14.9	15.9	82.6	19.1	4	48	26.7	24	25	56	16	27.7	27.7	28.2	20.9	3	25.0
1	125	15.9	17.5	88.9	19.1	4	54	33.4	25	27	60	18	34.5	34.5	34.9	26.6	3	15.8
1 1/4	135	17.5	19.1	98.4	19.1	4	64	42.2	25	27	64	21	43.2	43.2	43.7	35.1	5	44.4
1 1/2	155	19.1	20.7	114.3	22.2	4	70	48.3	29	30	67	23	49.5	49.5	50.0	40.9	6	50.3

Dimensions of Class 600 Flanges

NPS	O.D. of Flange (O)	Thickness of Flanges Min (f)	Dia. of Hub (X)	Dia. of Bolt Circle (W)	Dia. of Bolt Holes (in)	No. of Bolts	Hub Dia. Beginning of Chamfer Weld Neck (A)	Threaded/Slip-On (Y)	Lapped (Y)	Welding Neck (Y)	Threaded/Length Threaded Flange Min. (B)	Slip-On Min. (B)	Lapped Min. (B)	Welding Neck (B)	Corner Radius of Bore Lapped Flange & Pipe (R)	Counter-Bore Threaded Flange Min. (Q)	Dia. of RF (R)	Socket Weld (D)
1/2	95	14.3	38	66.7	15.9	4	21.3	22	22	52	16	22.2	22.2	22.9	3	23.6	10	34.9
3/4	115	15.9	48	82.6	19.1	4	26.7	25	25	57	16	27.7	27.7	28.2	3	29.6	11	42.9
1	125	17.5	54	88.9	19.1	4	33.4	27	27	62	18	34.5	34.5	34.9	3	35.8	13	50.8
1 1/4	135	20.2	64	98.4	19.1	4	42.2	29	29	67	21	43.2	43.2	43.7	5	44.4	14	63.5
1 1/2	155	22.3	70	114.3	22.3	4	48.3	32	32	70	23	49.5	49.5	50.0	6	50.6	16	73.0

Dimensions of Class 900 Flanges

NPS	O.D. of Flange (O)	Thickness of Flanges Min (f)	Dia. of Hub (X)	Dia. of Bolt Circle (W)	Dia. of Bolt Holes (in)	No. of Bolts	Hub Dia. Beginning of Chamfer Weld Neck (A)	Threaded/Slip-On (Y)	Lapped (Y)	Welding Neck (Y)	Threaded/Length Flange Min. (B)	Slip-On Min. (B)	Lapped Min. (B)	Welding Neck (B)	Corner Radius of Bore Lapped Flange & Pipe (R)	Counter-Bore Threaded Flange Min. (Q)	Dia. of RF (R)	Socket Weld (D)
1/2	120	22.2	38	82.6	22.3	4	21.3	32	32	60	23	22.2	22.2	22.2	3	23.6	34.9	10
3/4	130	25.4	44	88.9	22.3	4	26.7	35	35	70	26	27.7	27.7	27.7	3	29.6	42.9	11
1	150	28.6	52	101.2	25.4	4	33.4	41	41	73	29	34.5	34.5	34.5	3	35.8	50.8	13
1 1/4	160	28.6	64	111.1	25.4	4	42.2	41	41	73	31	43.2	43.2	43.2	5	44.4	63.5	14
1 1/2	180	31.8	70	123.8	28.6	4	48.3	44	44	83	32	49.5	49.5	49.5	6	50.6	73.0	16

Table D — Working Steam Pressure Up to 50 lbs per sq. inch

Nominal Pipe Size	O.D. of Pipe	O.D.	P.C.D.	No. of Bolt	Dia of Bolt	Thickness
1/2"	21.3	95.3	66.7	4	12.7	4.8
3/4"	26.7	101.3	73.0	4	12.7	4.8
1"	33.4	114.3	82.6	4	12.7	4.8
1-1/4"	42.2	120.7	87.3	4	12.7	6.4
1-1/2"	48.3	131.4	98.4	4	12.7	6.4

Table E — Working Steam Pressure Up to 100 lbs per sq. inch

Nominal Pipe Size	O.D. of Pipe	O.D.	P.C.D.	No. of Bolt	Dia of Bolt	Thickness
1/2"	21.3	95.3	66.7	4	12.7	6.4
3/4"	26.7	101.3	73.0	4	12.7	6.4
1"	33.4	114.3	82.6	4	12.7	7.1
1-1/4"	42.2	120.7	87.3	4	12.7	7.9
1-1/2"	48.3	131.4	98.4	4	12.7	8.7

Table F — Working Steam Pressure 100–150 lbs per sq. inch

Nominal Pipe Size	O.D. of Pipe	O.D.	P.C.D.	No. of Bolt	Dia of Bolt	Thickness
1/2"	21.3	95.3	66.7	4	12.7	9.5
3/4"	26.7	101.3	73.0	4	12.7	9.5
1"	33.4	120.7	87.3	4	15.9	9.5
1-1/4"	42.2	133.4	98.4	4	15.9	12.7
1-1/2"	48.3	139.7	104.8	4	15.9	12.7

Table H — Working Steam Pressure 150–250 lbs per sq. inch

Nominal Pipe Size	O.D. of Pipe	O.D.	P.C.D.	No. of Bolt	Dia of Bolt	Thickness
1/2"	21.3	114.3	82.6	4	15.9	12.7
3/4"	26.7	114.3	82.6	4	15.9	12.7
1"	33.4	120.7	82.6	4	15.9	14.3
1-1/4"	42.2	133.4	98.4	4	15.9	17.0
1-1/2"	48.3	139.7	104.8	4	15.9	17.0

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