Stainless Steel Flanges | ASTM A182

Home Stainless Steel Flanges

PM Industries manufactures, supplies, and stocks stainless steel, one of the most useful materials in modern engineering. It is valued for corrosion resistance, strength, long life, and a clean finish. The base is iron with at least 10.5 percent chromium, and that chromium forms a thin passive oxide layer that repairs itself and keeps rust and oxidation off the surface, even in hard conditions. Different grades carry different properties. The austenitic 304 grade gives good general corrosion resistance for food processing and architectural work, while 316 adds molybdenum for better performance in marine, chemical, and pharmaceutical service where chlorides are present.

The appeal runs past corrosion resistance. Stainless steel offers high strength, good formability, weldability, and a hygienic surface, which puts it across many industries. In construction it goes into facades, handrails, and structural parts with a low-maintenance finish. Food and beverage work relies on its non-reactive surface to keep product clean, and medical and pharmaceutical equipment uses it because it sterilizes well and is biocompatible. Oil and gas, power generation, automotive, and aerospace work draws on duplex, super duplex, and high-alloy stainless grades for high-pressure, high-temperature, and sour service.

PM Industries holds a wide inventory of stainless steel, including pipes, tubes, sheets, plates, bars, fittings, and flanges, in several grades and finishes such as 2B, No. 4, BA, and mirror polish. The material is supplied to international standards such as ASTM, EN, and DIN to suit a range of fabrication work. Heat-resistant grades hold up in exhaust systems and furnaces, and low-carbon grades cut carbide precipitation during welding, which protects corrosion performance at the weld.

Stainless steel is also a sustainable choice. It is fully recyclable with no loss of quality, which supports green building and circular-economy work, and its long service life lowers replacement cost and environmental impact next to coated or painted options. Customers come to PM Industries for certified material with full traceability, competitive pricing, and technical support on picking the right grade for the job. From everyday kitchenware to critical infrastructure, stainless steel keeps delivering performance, long life, and value, which is why it stays a core material in manufacturing and construction. As a manufacturer, supplier, and stockist, PM Industries ships standard and high-performance stainless steel against fast quotes.

Specification Stainless Steel 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

Lap Joint

Weld Neck

Male Female

Nippo

Orifice

Plate

Puddle

Raised Face

Reducing

Ring Spacer

Ring Type Joint

Slip on

SocketWeld

Spade

Spectacle Blind

Square

Threaded Screwed

Tongue Groove

Weld Neck

Weldo

Equivalent Grade

Standard	Werkstoff Nr.	Uns	Jis	Bs	Gost	Afnor	En
304	1.4301	S30400	SUS 304	304S31	08Х18Н10	Z7CN18‐09	X5CrNi18-10
304L	1.4306 / 1.4307	S30403	SUS 304L	3304S11	03Х18Н11	Z3CN18‐10	X2CrNi18-9 / X2CrNi19-11
304H	1.4301	S30409	–	–	–	–	–
310	1.4841	S31000	SUS 310	310S24	20Ch25N20S2	–	X15CrNi25-20
310S	1.4845	S31008	SUS 310S	310S16	20Ch23N18	–	X8CrNi25-21
316	1.4401 / 1.4436	S31600	SUS 316	316S31 / 316S33	–	Z7CND17‐11‐02	X5CrNiMo17-12-2 / X3CrNiMo17-13-3
316L	1.4404 / 1.4435	S31603	SUS 316L	316S11 / 316S13	03Ch17N14M3 / 03Ch17N14M2	Z3CND17‐11‐02 / Z3CND18‐14‐03	X2CrNiMo17-12-2 / X2CrNiMo18-14-3
316Ti	1.4571	S31635	SUS 316Ti	320S31	08Ch17N13M2T	Z6CNDT17‐123	X6CrNiMoTi17-12-2
317	1.4449	S31700	SUS 317	–	–	–	–
317L	1.4438	S31703	SUS 317L	–	–	–	X2CrNiMo18-15-4
321	1.4541	S32100	SUS 321	–	–	–	X6CrNiTi18-10
321H	1.4878	S32109	SUS 321H	–	–	–	X12CrNiTi18-9
347	1.4550	S34700	SUS 347	–	08Ch18N12B	–	X6CrNiNb18-10
410	1.4006	S41000	SUS 410	410S21	–	–	X12Cr13
446	1.4762	S44600	–	–	–	–	–
904L	1.4539	N08904	SUS 904L	904S13	STS 317J5	Z2 NCDU 25-20	X1NiCrMoCu25-20-5

Chemical Properties

Type	Carbon	Manganese	Phosphorus	Sulfur	Silicon	Chromium	Nickel	Molybdenum
302	0.15	2.00	0.045	0.030	1.00	17.00/19.00	8.00/10.00	–
304	0.08	2.00	0.045	0.030	1.00	18.00/20.00	8.00/10.50	–
304L	0.03	2.00	0.045	0.030	1.00	18.00/20.00	8.00/12.00	–
309	0.20	2.00	0.045	0.030	1.00	22.00/24.00	12.00/15.00	–
309S	0.08	2.00	0.045	–	1.00	22.00/24.00	–	–
310	0.25	2.00	0.045	0.030	1.5	24.00/26.00	19.00/22.00	–
310S	0.08	2.00	0.045	0.030	1.5	24.00/26.00	19.00/22.00	–
316	0.08	2.00	0.045	0.030	1.00	16.00/18.00	10.00/14.00	2.00/3.00
316L	0.03	2.00	0.045	0.030	1.00	16.00/18.00	10.00/14.00	2.00/3.00
317	0.08	2.00	0.045	0.030	1.00/1.00	18.00/20.00	11.00/15.00	3.00/4.00
317L	0.03	2.00	0.045	0.030	0.75	18.00/20.00	11.00/15.00	3.00/4.00
321	0.08	2.00	0.040	0.030	1.00	17.00/19.00	9.00/12.00	0.75/0.75
347	0.08	2.00	0.040	0.030	0.5/1.00	17.00/19.00	9.00/12.00	0.5/0.75

Mechanical Properties

Type	UNS	Tensile Strength(ksi) Minimum	Yield Strength (ksi) Minimum	Elongation Minimum	Hardness (Brinell) Maximum	Hardness (Rockwell B) Maximum
302	S30200	75	30	40% in 2″	183	88
304	S30400	75	30	40% in 2″	183	88
304L	S30403	70	30	40% in 2″	183	88
309	S30900	75	30	40% in 2″	217	95
309S	S30908	75	30	40% in 2″	217	95
310	S31000	75	30	40% in 2″	217	95
310S	S31008	75	30	40% in 2″	217	95
316	S31600	75	30	40% in 2″	217	95
316L	S31603	70	25	35% in 2″	217	95
317	S31700	75	30	35% in 2″	217	95
317L	S31703	75	30	35% in 2″	217	95
321	S32100	75	30	40% in 2″	183	88
347	S34700	75	30	40% in 2″	183	88

ANSI B16.5 SS Flanges Dimensions Class-150

Nominal Pipe Size NPS (inches)	Class 150
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/4	3-3/8	4	1/2	0.62	2-1/4
1/2	3-1/2	4	1/2	0.62	2-3/8
3/4	3-7/8	4	1/2	0.62	2-3/4
1	4-1/4	4	1/2	0.62	3-1/8
1-1/4	4-5/8	4	1/2	0.62	3-1/2
1-1/2	5	4	1/2	0.62	3-7/8
2	6	4	5/8	0.75	4-3/4
2-1/2	7	4	5/8	0.75	5-1/2
3	7-1/2	4	5/8	0.75	6
3-1/2	8-1/2	8	5/8	0.75	7
4	9	8	5/8	0.75	7-1/2
5	10	8	3/4	0.88	8-1/2
6	11	8	3/4	0.88	9-1/2
8	13-1/2	8	3/4	0.88	11-3/4
10	16	12	7/8	1	14-1/4
12	19	12	7/8	1	17
14	21	12	1	1.12	18-3/4
16	23-1/2	16	1	1.12	21-1/4
18	25	16	1-1/8	1.25	22-3/4
20	27-1/2	20	1-1/8	1.25	25
24	32	20	1-1/4	1.38	29-1/2

SASME B16.5 SS Flanges Dimensions Class-300

Nominal Pipe Size NPS (inches)	Class 300
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/4	3-3/8	4	1/2	0.62	2-1/4
1/2	3-3/4	4	1/2	0.62	2-5/8
3/4	4-5/8	4	5/8	0.75	3-1/4
1	4-7/8	4	5/8	0.75	3-1/2
1-1/4	5-1/4	4	5/8	0.75	3-7/8
1-1/2	6-1/8	4	3/4	0.88	4-1/2
2	6-1/2	8	5/8	0.75	5
2-1/2	7-1/2	8	3/4	0.88	5-7/8
3	8-1/4	8	3/4	0.88	6-5/8
3-1/2	9	8	3/4	0.88	7-1/4
4	10	8	3/4	0.88	7-7/8
5	11	8	3/4	0.88	9-1/4
6	12-1/2	12	3/4	0.88	10-5/8
8	15	12	7/8	1	13
10	17-1/2	16	1	1.12	15-1/4
12	20-1/2	16	1-1/8	1.25	17-3/4
14	23	20	1-1/8	1.25	20-1/4
16	25-1/2	20	1-1/4	1.38	22-1/2
18	28	24	1-1/4	1.38	24-3/4
20	30-1/2	24	1-1/4	1.38	27
24	36	24	1-1/2	1.62	32

SASME B16.5 SS Flanges Dimensions Class-400

Nominal Pipe Size NPS (inches)	Class 400
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/4	3-3/8	4	1/2	0.62	2-1/4
1/2	3-3/4	4	1/2	0.62	2-5/8
3/4	4-5/8	4	5/8	0.75	3-1/4
1	4-7/8	4	5/8	0.75	3-1/2
1-1/4	5-1/4	4	5/8	0.75	3-7/8
1-1/2	6-1/8	4	3/4	0.88	4-1/2
2	6-1/2	8	5/8	0.75	5
2-1/2	7-1/2	8	3/4	0.88	5-7/8
3	8-1/4	8	3/4	0.88	6-5/8
3-1/2	9	8	7/8	1	7-1/4
4	10	8	7/8	1	7-7/8
5	11	8	7/8	1	9-1/4
6	12-1/2	12	7/8	1	10-5/8
8	15	12	1	1.12	13
10	17-1/2	16	1-1/8	1.25	15-1/4
12	20-1/2	16	1-1/4	1.38	17-3/4
14	23	20	1-1/4	1.38	20-1/4
16	25-1/2	20	1-3/8	1.5	22-1/2
18	28	24	1-3/8	1.5	24-3/4
20	30-1/2	24	1-1/2	1.62	27
24	36	24	1-3/4	1.88	32

SASME B16.5 SS Flanges Dimensions Class-600

Nominal Pipe Size NPS (inches)	Class 600
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/4	3-3/8	4	1/2	0.62	2-1/4
1/2	3-3/4	4	1/2	0.62	2-5/8
3/4	4-5/8	4	5/8	0.75	3-1/4
1	4-7/8	4	5/8	0.75	3-1/2
1-1/4	5-1/4	4	5/8	0.75	3-7/8
1-1/2	6-1/8	4	3/4	0.88	4-1/2
2	6-1/2	8	5/8	0.75	5
2-1/2	7-1/2	8	3/4	0.88	5-7/8
3	8-1/4	8	3/4	0.88	6-5/8
3-1/2	9	8	7/8	1	7-1/4
4	10-3/4	8	7/8	1	8-1/2
5	13	8	1	1.12	10-1/2
6	14	12	1	1.12	11-1/2
8	16-1/2	12	1-1/8	1.25	13-3/4
10	20	16	1-1/4	1.38	17
12	22	20	1-1/4	1.38	19-1/4
14	23-3/4	20	1-3/8	1.5	20-3/4
16	27	20	1-1/2	1.62	23-3/4
18	29-1/4	20	1-5/8	1.75	25-3/4
20	32	24	1-5/8	1.75	28-1/2
24	37	24	1-7/8	2	33

SASME B16.5 SS Flanges Dimensions Class-900

Nominal Pipe Size NPS (inches)	Class 900
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/2	4-3/4	4	3/4	0.88	3-1/4
3/4	5-1/8	4	3/4	0.88	3-1/2
1	5-7/8	4	7/8	1	4
1-1/4	6-1/4	4	7/8	1	4-3/8
1-1/2	7	4	1	1.12	4-7/8
2	8-1/2	8	7/8	1	6-1/2
2-1/2	9-5/8	8	1	1.12	7-1/2
3	9-1/2	8	7/8	1	7-1/2
4	11-1/2	8	1-1/8	1.25	9-1/4
5	13-3/4	8	1-1/4	1.38	11
6	15	12	1-1/8	1.25	12-1/2
8	18-1/2	12	1-3/8	1.5	15-1/2
10	21-1/2	16	1-3/8	1.5	18-1/2
12	24	20	1-3/8	1.5	21
14	25-1/4	20	1-1/2	1.62	22
16	27-3/4	20	1-5/8	1.75	24-1/2
18	31	20	1-7/8	2	27
20	33-3/4	20	2	2.12	29-1/2
24	41	20	2-1/2	2.62	35-1/2

SASME B16.5 SS Flanges Dimensions Class-1500

Nominal Pipe Size NPS (inches)	Class 1500
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/2	4-3/4	4	3/4	0.88	3-1/4
3/4	5-1/8	4	3/4	0.88	3-1/2
1	5-7/8	4	7/8	1	4
1-1/4	6-1/4	4	7/8	1	4-3/8
1-1/2	7	4	1	1.12	4-7/8
2	8-1/2	8	7/8	1	6-1/2
2-1/2	9-5/8	8	1	1.12	7-1/2
3	10-1/2	8	1-1/8	1.25	8
4	12-1/4	8	1-1/4	1.38	9-1/2
5	14-3/4	8	1-1/2	1.62	11-1/2
6	15-1/2	12	1-3/8	1.5	12-1/2
8	19	12	1-5/8	1.75	15-1/2
10	23	12	1-7/8	2	19
12	26-1/2	16	2	2.12	22-1/2
14	29-1/2	16	2-1/4	2.38	25
16	32-1/2	16	2-1/2	2.62	27-3/4
18	36	16	2-3/4	2.88	30-1/2
20	38-3/4	16	3	3.12	32-3/4
24	46	16	3-1/2	3.62	39

SASME B16.5 SS Flanges Dimensions Class-2500

Nominal Pipe Size NPS (inches)	Class 2500
Nominal Pipe Size NPS (inches)	Diameter of Flange (inches)	No. of Bolts	Diameter of Bolts (inches)	Diameter of Bolt Holes (inches)	Bolt Circle (inches)
1/2	5-1/4	4	3/4	0.88	3-1/2
3/4	5-1/2	4	3/4	0.88	3-3/4
1	6-1/4	4	7/8	1	4-1/4
1-1/4	7-1/4	4	1	1.12	5-1/8
1-1/2	8	4	1-1/8	1.25	5-3/4
2	9-1/4	8	1	1.12	6-3/4
2-1/2	10-1/2	8	1-1/8	1.25	7-3/4
3	12	8	1-1/4	1.38	9
4	14	8	1-1/2	1.62	10-3/4
5	16-1/2	8	1-3/4	1.88	12-3/4
6	19	8	2	2.12	14-1/2
8	21-3/4	12	2	2.12	17-1/4
10	26-1/2	12	2-1/2	2.62	21-1/4
12	30	12	2-3/4	2.88	24-3/8

Pressure Class/ Rating

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

Weight Of SS Pipe Flanges

Grades	Available Classes	Dia	Bolt Circle Dia	No of Bolt used	Bolts Sizes	Dia of Bolts Hole
As 4087	PN 14	95	67	4	M 12	14
As2129	Table c	95	67	4	13	14
	Table h	114	83	4	16	17
	Table d	95	67	4	13	14
	Table e	95	67	4	13	14
	Table f	95	67	4	13	14
	Table j	114	83	4	16	17
Ansi B16 5	class 150	89	60	4	13	16
	class 600	95	67	4	13	16
	class 900	121	83	4	19	22
	class 1500	121	83	4	19	22
	class 300	95	67	4	13	16
Iso7005	Pn 6	80	55	4	M 10	11
	Pn 10	95	65	4	M 12	14
	Pn 20	90	60.5	4	M 14	16
	Pn 25	95	65	4	M 12	14
	Pn 40	95	65	4	M 12	14
	Pn 16	95	65	4	M 12	14

FAQs

A common first question is the difference between 304 and 316. Both are austenitic grades, but 316 contains molybdenum, which gives better resistance to chlorides and pitting, so it suits marine, chemical, and coastal service, while 304 handles general and food-grade work at lower cost.

Buyers also ask what makes stainless steel corrosion resistant. The chromium content forms a passive oxide film on the surface that reforms when scratched, which keeps rust from taking hold. Higher chromium, molybdenum, and nitrogen raise that resistance further in duplex and super duplex grades.

On forms, finishes, and standards, PM Industries supplies stainless steel as pipe, tube, sheet, plate, bar, fittings, and flanges, in finishes such as 2B, No. 4, BA, and mirror polish, to ASTM, EN, and DIN, with certification and traceability.

Application

Food & Beverage
Paper Industry
Pharmaceutical
Hospital Equipment
Textiles
Dairy
Aircraft
Chemicals
Others Parts in Machinery

Testing

Hydrostatic Test
Macro Test
Ultra Sonic Test (UT)
Micro Test
Hardness Test
Radiography Test
Pitting Resistance Test
PMI Testing
Mechanical Testing
X-ray detector

Packing

Wooden Boxes
Shrink-Wrappedt
Carton Boxes
Wooden Crates
Wooden Pallets