UNI Flanges | UNI 2276-2278 | Italian Standard

Uni Flanges are mechanical pipe connectors that join plain-end pipe to flanged piping without welding. They give you a secure, leak-proof joint and a faster way to assemble, maintain, or repair a line. You will find them in water supply networks, wastewater treatment plants, irrigation, fire protection systems, municipal infrastructure, power plants, chemical facilities, marine work, and general industrial piping. The appeal is simple: they hold a tight seal across a range of pressures and temperatures while keeping installation straightforward. PM Industries manufactures, supplies, and stocks Uni Flanges in a wide range of materials, sizes, and drilling standards.

We make Uni Flanges from ductile iron, carbon steel, stainless steel, and other corrosion-resistant alloys, so they bring real mechanical strength and stand up to corrosion, impact, and wear. They work with many pipe materials, including steel, ductile iron, PVC, HDPE, and other compatible systems, which makes them a flexible fit for utility and industrial jobs alike. Sizes, pressure ratings, and flange drilling cover ASME, ANSI, DIN, BS, and EN standards, so you can match the flange to the project rather than the other way around. The compact build keeps alignment accurate and spreads load evenly, which cuts both installation time and long-term maintenance cost. Most Uni Flanges use a gripping mechanism and a sealing gasket that lock the pipe in place and holds back leaks even under hard service.

Every Uni Flange runs through full quality control: dimensional inspection, hydrostatic testing, coating inspection, pressure testing, and other mechanical checks against international standards and your spec. Protective finishes such as fusion bonded epoxy (FBE), epoxy coating, galvanizing, and other corrosion-resistant treatments add years of service life in harsh settings. Skipping the weld is part of the value here. It cuts downtime, lowers labor, and leaves the line easy to modify or service later.

With sound structural integrity, dependable sealing, and a long working life, Uni Flanges are a practical choice wherever safety, speed, and durability matter. PM Industries holds stock ready to ship, with certification and test documentation on every order. Tell us your pipe material, size, pressure rating, and drilling standard, and we will quote it.

Specification UNI Flange

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

UNI Flanges Dimensions

Directions for the designation		d1		a	b	D	f	Holes	Screws	Weight* Kilogram
Rated Dia.	External diameter of the pipe	Nominal	Tolerance
15	20	20,5	+0,5	55	10	80	11	4	M 10	0,34
	21,3	22								0,33
20	25	25,5		65	12	90	11	4	M 10	0,51
	26,9	27,5								0,50
25	30	30,5		75	12	100	11	4	M 10	0,63
	33,7	34								0,61
32	38	38,5		90	14	120	14	4	M 12	1,09
	42,4	43								1,05
40	44,5	45		100	14	130	14	4	M 12	1,26
	48,3	49								1,23
50	57	58		110	14	140	14	4	M 12	1,38
	60,3	61,5								1,35
65	76,1	77		130	14	160	14	4	M 12	1,68
80	88,9	90		150	16	190	18	4	M 16	2,63
100	108	109	+1,0	170	16	210	18	4***	M 16	3,05
	114,3	115,5								2,92
125	133	134,5		200	18	240	18	8	M 16	4,11
	139,7	141								3,90
150	159	160,5		225	20	265	18	8	M 16	5,16
	168,3	170								4,78
175	193,7	195,5		255	22	295	18	8	M 16	6,27
200	219,1	221		280	22	320	18	8	M 16	6,91
250	267	269		335	24	375	18	12	M 16	9,53
	273	275								9,04
300	323,9	326		395	24	440	22	12	M 20	12,1
350	355,6	358		445	26	490	22	12	M 20	17,0
	368	370,5								15,6
400	406,4	409	+1,5	495	28	540	22	16	M 20	20,1
	419	422								18,3
450	457,2	460,2	±5	550	28	595	22	16	M 20	25,8
500	508	511		600	30	645	22	20	M 20	30,0
600	609,6	612,6		705	30	755	25	20	M 22	37,9
700	711,2	714,2		810	32	860	25	24	M 22	47,9
800	812,8	815,8		920	34	975	30	24	M 27	62,9
900	914,4	917,4		1020	36	1075	30	24	M 27	74,6
1000	1016	1019		1120	36	1175	30	28	M 27	81,9

UNI Flange Technical Data Info

Des.	Rated Pressure / Presión Nominal / Nenndruck (in bar) (1 bar = 14.5 psi)
1	2.5	6	10	16	25	40	64	100	160	250	320	400
DIN
Blind (BLRF) Flanges	6091	6092	6093	6094	6095	6096	6097	6098	6099
Flat (FF) flange for welding (slip-on)	2276	2277	2278	6083	6084
Welding neck (wnrf) flanges	2280	2281	2282	2283	2284	2285	2286
Lap joint flanges, Plain collars	6088	6089	6090
Loose flanges and rings for welding
Loose flanges and rings with neck for welding
Oval plain threaded flanges
Oval flanges, with neck threaded
NPT flanges with neck	2253	2254
Long neck weld flanges
Hubbed slip-on (sorf) flanges for welding

UNI 2277 PN10 Plate Flange Dimensions

UNI 2277 Pn 10 Plate Flange
Designation Directions		d1		a	b	D	f	Holes	screws	Weight in Kg
Rated Dia.	External dia. of the pipe	Nominal	Dimensional Tolerance							Kilogram
15	20	20,5	+0,5	65	12	95	14	4	M 12	0,67
	21,3	22								0,66
20	25	25,5		75	14	105	14	4	M 12	0,83
	26,9	27,5								0,82
25	30	30,5		85	14	115	14	4	M 12	1,03
	33,7	34								1,01
32	38	38,5		100	16	140	18	4	M 16	1,66
	42,4	43								1,63
40	44,5	45		110	16	150	18	4	M 16	1,89
	48,3	49								1,85
50	57	58		125	18	165	18	4	M 16	2,51
	60,3	61,5								2,46
65	76,1	77		145	18	185	18	4	M 16	3,00
80	88,9	90		160	20	200	18	4	M 16	3,61
100	108	109	+1,0	180	22	220	18	8	M 16	4,60
	114,3	115,5								4,40
125	133	134,5		210	24	250	18	8	M 16	6,19
	139,7	141								5,92
150	159	160,5		240	24	285	22	8	M 20	7,63
	168,3	170								7,17
175	193,7	195,5		270	26	315	22	8	M 20	9,16
200	219,1	221		295	26	340	22	8	M 20	10,1
250	267	269		350	28	395	22	12	M 20	13,4
	273	275								12,9
300	323,9	326		400	28	445	22	12	M 22	14,8
350	355,6	358		460	30	505	22	16	M 20	22,0
	368	370,5								20,4
400	406,4	409	+1,5	515	32	565	25	16	M 22	28,0
	419	422								25,9
450	457,2	460,2	±5	565	32	615	25	20	M 22	33,3
500	508	511		620	34	670	25	20	M 22	40,3
600	609,6	612,6		725	36	780	30	20	M 27	53,0

UNI 2278 PN16 Plate Flange Dimensions

UNI 2278 PN16 Plate Flange Dimensions
Designation Directions		d1		a	b	D	f	Hole	screw	Weight In Kg
Rated Dia.	External dia. of the pipe	Nominal	Dimensional Tolerance							Kilogram
15	20	20,5	+0,5	65	12	95	14	4	M 12	0,67
	21,3	22								0,66
20	25	25,5		75	14	105	14	4	M 12	0,83
	26,9	27,5								0,82
25	30	30,5		85	14	115	14	4	M 12	1,03
	33,7	34								1,01
32	38	38,5		100	16	140	18	4	M 16	1,66
	42,4	43								1,63
40	44,5	45		110	16	150	18	4	M 16	1,89
	48,3	49								1,85
50	57	58		125	18	165	18	4	M 16	2,51
	60,3	61,5								2,46
65	76,1	77		145	18	185	18	4	M 16	3,00
80	88,9	90		160	20	200	18	8**	M 16	3,61
100	108	109	+1,0	180	22	220	18	8	M 16	4,60
	114,3	115,5								4,40
125	133	134,5		210	24	250	18	8	M 16	6,19
	139,7	141								5,92
150	159	160,5		240	24	285	22	8	M 20	7,63
	168,3	170								7,17
175	193,7	195,5		270	26	315	22	8	M 20	9,16
200	219,1	221		295	26	340	22	12	M 20	9,77
250	267	269		355	32	405	25	12	M 22	16,6
	273	275								16,0
300	323,9	326		410	32	460	25	12	M 22	19,3
350	355,6	358		470	36	520	25	16	M 22	29,4
	368	370,5								27,3
400	406,4	409	+1,5	525	38	580	30	16	M 27	36,5
	419	422								33,9

UNI 2281 PN10 Welding Neck Flange Dimensions

Uni 2281 Pn10 Weld Neck Flange Dimensions
Designation Directions		d1	a	b	D	f	h	h1	m	r	s	Hole	Screw	Weight In KG
Rated Dia.	External dia. of the pipe													Kilogram
15	20	21	65	14	95	14	35	6	30	4	2,5	4	M 12	0,73
	21,3	22,5							32					0,73
20	25	26	75	16	105	14	38	6	38	4	2,5	4	M 12	1,03
	26,9	28							40					1,03
25	30	31	85	16	115	14	38	6	42	4	2,8	4	M 12	1,24
	33,7	34,5							45					1,23
32	38	39	100	16	140	18	40	6	52	6	3	4	M 16	1,82
	42,4	43,5							56					1,80
40	44,5	45,5	110	16	150	18	42	7	60	6	3	4	M 16	2,10
	48,3	49,5							64					2,08
50	57	58	125	18	165	18	45	8	72	6	3,5	4	M 16	2,81
	60,3	61,5							75					2,78
65	76,1	77	145	18	185	18	45	10	90	6	3,5	4	M 16	3,40
80	88,9	90	160	20	200	18	50	10	105	8	3,7	8**	M 16	4,20
100	108	109	180	20	220	18	52	12	125	8	3,7	8	M 16	4,90
	114,3	115,5							131					4,75
125	133	134	210	22	250	18	55	12	150	8	4	8	M 16	6,70
	139,7	141							156					6,45
150	159	161	240	22	285	22	55	12	175	10	5	8	M 20	8,30
	168,3	170,5							184					8,00
175	193,7	195,5	270	24	315	22	60	12	210	10	5	8	M 20	10,3
200	219,1	221	295	24	340	22	62	16	235	10	5	8	M 20	11,4
250	267	269	350	26	395	22	68	16	285	12	5,5	12	M 20	15,6
	273	275							292					15,2
300	323,9	326	400	26	445	22	68	16	344	12	6	12	M 20	18,0
350	355,6	357,5	460	26	505	22	68	16	385	12	6,4	16	M 20	24,5
	368	370												22,5
400	406,4	408,5	515	26	565	25	72	16	440	12	7	16	M 22	30,2
	419	421												27,8
450	457,2	459	565	26	615	25	72	16	478	12	7,3	20	M 22	32,3
500	508	510	620	28	670	25	75	16	542	12	7,3	20	M 22	40,4
600	609,6	611,5	725	28	780	30	80	18	642	12	7,3	20	M 27	50,0
700	711,2	715	840	30	895	30	80	18	745	12	9	24	M 27	66,4
800	812,8	817	950	32	1015	33	90	18	850	12	9	24	M 30	89,3
900	914,4	918	1050	34	1115	33	95	20	950	12	9	28	M 30	104
1000	1016	1020	1160	34	1230	36	95	20	1052	16	9	28	M 33	121
1200	1220	1224	1380	38	1455	39	115	25	1255	16	10	32	M 36 x 3	180
1400	1420	1424	1590	42	1675	42	120	25	1460	16	11	36	M 39 x 3	248
1600	1620	1624	1820	46	1915	48	130	25	1665	16	12	40	M 45 x 3	352
1800	1820	1824	2020	50	2115	48	140	30	1868	16	13	44	M 45 x 3	433
2000	2020	2024	2230	54	2325	48	150	30	2072	16	14	48	M 45 x 3	543

UNI 2282 PN16 Welding Neck Flange Dimensions

UNI 2282 Pn16 Weld Neck Flange Dimensions
Designation Directions		d1	a	b	D	f	h	h1	m	r	s	Hole	Screw	Weight In KG
Rated Dia.	External dia. of the pipe													Kilogram
15	20	21	65	14	95	14	35	6	30	4	2,5	4	M 12	0,73
	21,3	22,5							32					0,73
20	25	26	75	16	105	14	38	6	38	4	2,5	4	M 12	1,03
	26,9	28							40					1,03
25	30	31	85	16	115	14	38	6	42	4	2,8	4	M 12	1,24
	33,7	34,5							45					1,23
32	38	39	100	16	140	18	40	6	52	6	3	4	M 16	1,82
	42,4	43,5							56					1,80
40	44,5	45,5	110	16	150	18	42	7	60	6	3	4	M 16	2,10
	48,3	49,5							64					2,08
50	57	58	125	18	165	18	45	8	72	6	3,5	4	M 16	2,81
	60,3	61,5							75					2,78
65	76,1	77	145	18	185	18	45	10	90	6	3,5	4	M 16	3,40
80	88,9	90	160	20	200	18	50	10	105	8	3,7	8**	M 16	4,20
100	108	109	180	20	220	18	52	12	125	8	3,7	8	M 16	4,90
	114,3	115,5							131					4,75
125	133	134	210	22	250	18	55	12	150	8	4	8	M 16	6,70
	139,7	141							156					6,45
150	159	161	240	22	285	22	55	12	175	10	5	8	M 20	8,30
	168,3	170,5							184					8,00
175	193,7	195,5	270	24	315	22	60	12	210	10	5	8	M 20	10,3
200	219,1	221	295	24	340	22	62	16	235	10	5	12	M 20	11,1
250	267	269	355	26	405	25	70	16	285	12	5,5	12	M 22	16,7
	273	275							292					16,3
300	323,9	326	410	28	460	25	78	16	344	12	6	12	M 22	21,8
350	355,6	357,5	470	30	520	25	82	16	390	12	6,4	16	M 22	31,7
	368	370												29,2
400	406,4	408,5	525	32	580	30	85	16	445	12	7	16	M 27	38,3
	419	421												37,0
450	457,2	459	585	32	640	30	85	16	485	12	7,3	20	M 27	45,4
500	508	510	650	34	715	33	90	16	548	12	7,3	20	M 30	61,1
600	609,6	611,5	770	36	840	36	95	18	652	12	7,3	20	M 33	84,6
700	711,2	715	840	36	910	39	100	18	755	12	9	24	M 33	87,4
800	812,8	817	950	38	1025	39	105	20	855	12	9	24	M 36 x 3	109
900	914,4	918	1050	40	1125	42	110	20	955	12	10	28	M 36 x 3	129
1000	1016	1020	1170	42	1255	48	120	22	1058	16	12	28	M 39 x 3	175
1200	1220	1224	1390	48	1485	48	130	30	1262	16	14	32	M 45 x 3	257
1400	1420	1424	1590	52	1685	48	145	30	1465	16	16	36	M 45 x 3	337
1600	1620	1624	1820	58	1930	56	160	35	1668	16	17	40	M 52 x 3	481
1800	1820	1824	2020	62	2130	56	170	35	1870	16	19	44	M 52 x 3	591
2000	2020	2024	2230	66	2345	62	180	40	2072	16	21	48	M 56 x 4	727

UNI 2283 PN25 Welding Neck Flange Dimensions

UNI 2283 Pn25 Weld Neck Flange Dimensions
Designation Directions		d1	a	b	D	f	h	h1	m	r	s	Hole	Screw	Weight In KG
Rated Dia.	External dia. of the pipe													Kilogram
15	20	21	65	16	95	14	38	6	30	4	2,5	4	M 12	0,83
	21,3	22,5							32					0,83
20	25	26	75	18	105	14	40	6	38	4	2,5	4	M 12	1,15
	26,9	28							40					1,15
25	30	31	85	18	115	14	40	6	42	4	2,8	4	M 12	1,39
	33,7	34,5							46					1,38
32	38	39	100	18	140	18	42	6	52	6	3	4	M 16	2,03
	42,4	43,5							56					2,01
40	44,5	45,5	110	18	150	18	45	7	60	6	3	4	M 16	2,35
	48,3	49,5							64					2,33
50	57	58	125	20	165	18	48	8	72	6	3,5	4	M 16	3,11
	60,3	61,5							75					3.08
65	76,1	77	145	22	185	18	52	10	90	6	3,5	8	M 16	3,95
80	88,9	90	160	24	200	18	58	12	105	8	3,7	8	M 16	4,98
100	108	109	190	24	235	22	65	12	128	8	3,7	8	M 20	6,85
	114,3	115,5							134					6,70
125	133	134	220	26	270	25	68	12	155	8	4	8	M 22	9,42
	139,7	141							162					9,20
150	159	161	250	28	300	25	75	12	182	10	5	8	M 22	12,4
	168,3	170,5							192					12,0
175	193,7	195,5	280	28	330	25	75	15	218	10	5	12	M 22	13,6
200	219,1	221	310	30	360	25	80	16	244	10	5	12	M 22	16,8
250	267	269	370	32	425	30	88	18	292	12	5,5	12	M 27	23,8
	273	275							298					23,3
300	323,9	326	430	34	485	30	92	18	352	12	6	16	M 27	30,5
350	355,6	357,5	490	38	555	33	100	20	398	12	6,4	16	M 30	47,6
	368	370												44,5
400	406,4	408,5	550	40	620	36	110	20	452	12	7,3	16	M 33	62,1
	419	421												58,3
450	457,2	459	600	40	670	36	115	20	492	12	8	20	M 33	67,8
500	508	510	660	44	730	36	125	20	558	12	8	20	M 33	88,8
600	609,6	611,5	770	46	845	39	125	20	660	12	8	20	M 36 x 3	114
700	711,2	715	875	46	960	42	125	20	760	12	10	24	M 39 x 3	138
800	812,8	817	990	50	1085	48	135	22	865	12	11	24	M 45 x 3	185
900	914,4	918	1090	54	1185	48	145	24	968	12	12	28	M 45 x 3	224
1000	1016	1020	1210	58	1320	56	155	24	1070	16	13	28	M 52 x 3	293

UNI 2253 PN6 Threaded Flange Dimensions

Uni 2253 Pn6 Threaded Flange Dimensions
Flanges					Neck	Raised face (RF)		Screws			Weight in kg (7,85 Kg/dm3)
Rated Dia.	d1	Thread	D	b	k	h1	d3	d4	f	Number	Thread	d2	Kilogram
15	21,3	R 1/2	80	12	55	20	30	40	2	4	M 10	11	0,373
20	26,9	R 3/4	90	14	65	24	40	50	2	4	M 10	11	0,59
25	33,7	R 1	100	14	75	24	50	60	2	4	M 10	11	0,743
32	42,4	R 1 1/4	120	14	90	26	60	70	2	4	M 12	14	1,05
40	48,3	R 1 1/2	130	14	100	26	70	80	3	4	M 12	14	1,2
50	60,3	R 2	140	14	110	28	80	90	3	4	M 12	14	1,37
65	76,1	R 2 1/2	160	14	130	32	100	110	3	4	M 12	14	1,92
80	88,9	R 3	190	16	150	34	110	128	3	4	M 16	18	2,82
100	114,3	R 4	210	16	170	38	130	148	3	4	M 16	18	3,19
125	139,7	R 5	240	18	200	40	160	178	3	8	M 16	18	4,47
150	165,1	R 6	265	18	225	44	185	202	3	8	M 16	18	5,3

UNI 2254 PN16 Threaded Flange Dimensions

UNI 2254 Pn16 Threaded Flange Dimensions
Rated Dia.	d1	Flanges					Neck	Raised face (rf)		Screws			Weight in kg (7,85 Kg/dm3)
		Thread	D	b	k	h1	d3	d4	f	Number	Thread	d2	Kilogram
15	21,3	R 1/2	95	14	65	20	35	45	2	4	M 12	14	0,613
20	26,9	R 3/4	105	16	75	24	45	58	2	4	M 12	14	0,91
25	33,7	R 1	115	16	85	24	52	68	2	4	M 12	14	1,1
32	42,4	R 1 1/4	140	16	100	26	60	78	2	4	M 16	18	1,6
40	48,3	R 1 1/2	150	16	110	26	70	88	3	4	M 16	18	1,78
50	60,3	R 2	165	18	125	28	85	102	3	4	M 16	18	2,43
65	76,1	R 2 1/2	185	18	145	32	105	122	3	4	M 16	18	3,18
80	88,9	R 3	200	20	160	34	118	138	3	8	M 16	18	4,12
100	114,3	R 4	220	20	180	38	140	158	3	8	M 16	18	4,47
125	139,7	R 5	250	22	210	40	168	188	3	8	M 16	18	6,13
150	165,1	R 6	285	22	240	44	195	212	3	8	M 20	22	7,92

UNI 6092 PN10 Blind Flange Dimensions

UNI 6092 pn10 blind flange dimensions
Rated Dia.	a	b	D	f	No. of holes	Thread of the screws	Weight in Kilogram
15	65	14	95	14	4	M 12	0,71
20	75	16	105	14	4	M 12	1,01
25	85	16	115	14	4	M 12	1,22
32	100	16	140	18	4	M 16	1,80
40	110	16	150	18	4	M 16	2,09
50	125	18	165	18	4	M 16	2,87
65	145	18	185	18	4	M 16	3,65
80	160	20	200	18	4	M 16	4,61
100	180	20	220	18	8	M 16	5,65
125	210	22	250	18	8	M 16	8,12
150	240	22	285	22	8	M 20	10,5
175	270	24	315	22	8	M 20	14,1
200	295	24	340	22	8	M 20	16,5
250	350	26	395	22	12	M 20	24,1
300	400	26	445	22	12	M 20	30,8
350	460	26	505	22	16	M 20	39,6
400	515	26	565	25	16	M 22	49,6
450	565	26	615	25	20	M 22	58,6
500	620	28	670	25	20	M 22	75,3

UNI 6093 PN16 Blind Flange Dimensionss

UNI 6093 Pn16 Blind Flange Dimensions
Rated Dia.	a	b	D	f	No. of holes	Thread of the screws	Weight in Kilogram
15	65	14	95	14	4	M 12	0,71
20	75	16	105	14	4	M 12	1,01
25	85	16	115	14	4	M 12	1,22
32	100	16	140	18	4	M 16	1,80
40	110	16	150	18	4	M 16	2,09
50	125	18	165	18	4	M 16	2,87
65	145	18	185	18	4	M 16	3,65
80	160	20	200	18	8**	M 16	4,61
100	180	20	220	18	8	M 16	5,65
125	210	22	250	18	8	M 16	8,12
150	240	22	285	22	8	M 20	10,5
175	270	24	315	22	8	M 20	14,1
200	295	24	340	22	12	M 20	16,2
250	355	26	405	25	12	M 22	25,1
300	410	28	460	25	12	M 22	35,2
350	470	30	520	25	16	M 22	48,2
400	525	32	580	30	16	M 27	63,5
450	585	32	640	30	20	M 27	77,2
500	650	34	715	33	20	M 30	102

Stainless Steel UNI Flange Pressure Rating

ASME B16.5 Pressure Pressure
Temperature (°C)	Class
	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-29 - 38	19.8	51.7	68.9	103.4	155	259	431
50	19.5	51.7	68.9	103.4	155	259	431
100	17.7	51.5	68.7	103.0	155	258	429
150	15.8	50.2	66.8	100.3	151	251	418
200	13.8	48.6	64.8	97.2	146	243	405
250	12.1	46.3	61.7	92.7	139	232	386
300	10.2	42.9	57.0	85.7	129	214	357
325	9.3	41.4	55.0	82.6	124	207	344
350	8.4	40.0	53.4	80.0	120	200	334
375	7.4	37.8	50.4	75.7	114	189	315
400	6.5	34.7	46.3	69.4	104	174	290
425	5.5	28.8	38.4	57.5	86.3	144	240
450	4.6	23.0	30.7	46.0	69.0	115	192
475	3.7	17.1	22.8	34.2	51.3	85.4	142
500	2.8	11.6	15.4	23.2	34.7	57.9	96.5
538	1.4	5.9	7.9	11.8	17.7	29.5	49.2

UNI Flange Torque Specs

NPS	Outside Diameter (O.D.) of Flange D	Sectional Dimensions of Flanges													Nominal Bolts Sizes
		Diameter Of Bolt Circle C	Diameter of Raised Face (RF) g	Outside Diameter (O.D.) of Steel Pipe	T	b	a	R	t	d	Radius r	s	f	No. of Bolt Holes		Diameter of Hole h
15	115	80	55	21.7	45	40	22	20	18	15.8	6	3.1	1	4	19	M16
20	120	85	60	27.2	45	44	27.5	20	18	21.1	6	3.2	1	4	19	M16
25	130	95	70	34	48	52	34.4	20	20	26.8	6	3.8	1	4	19	M16
32	140	105	80	42.7	52	62	43.1	30	22	35.1	6	4	2	4	19	M16
40	160	120	90	48.6	54	70	49.1	30	22	40.7	6	4.2	2	4	23	M20
50	165	130	105	60.5	57	84	61	30	22	52.2	8	4.4	2	8	19	M16
65	200	160	130	76.3	69	105	76.9	30	26	65.3	8	5.8	2	8	23	M20
80	210	170	140	89.1	73	118	89.7	30	28	76.4	8	6.1	2	8	23	M20
90	230	185	150	101.6	74	130	102	30	30	89.5	8	6.4	2	8	25	M22
100	240	195	160	114.3	76	142	115	30	32	101.5	8	6.8	2	8	25	M22
125	275	230	195	139.8	86	172	141	50	36	125.7	10	7.5	2	8	25	M22
150	325	275	235	165.2	95	202	166	50	38	150	10	8.1	2	12	27	M24
200	370	320	280	216.3	102	254	218	50	42	198.7	10	9.4	2	12	27	M24
250	450	390	345	267.4	118	312	269	50	48	247.5	12	10.6	2	12	33	M30 3
300	515	450	405	318.5	127	366	320	50	52	296.4	15	11.8	3	16	33	M30 3
350	560	495	450	355.6	134	406	357	80	54	331.8	15	12.7	3	16	33	M30 3
400	630	560	510	406.4	149	462	408	80	60	379.1	20	14.6	3	16	39	M36 3

UNI Flange Torque Specs

NPS	Outside Diameter (O.D.) of Flange D	Sectional Dimensions of Flanges													Nominal Bolts Sizes
		Diameter Of Bolt Circle C	Diameter of Raised Face (RF) g	Outside Diameter (O.D.) of Steel Pipe	T	b	a	R	t	d	Radius r	s	f	No. of Bolt Holes		Diameter of Hole h
15	115	80	55	21.7	45	40	22	20	18	15.8	6	3.1	1	4	19	M16
20	120	85	60	27.2	45	44	27.5	20	18	21.1	6	3.2	1	4	19	M16
25	130	95	70	34	48	52	34.4	20	20	26.8	6	3.8	1	4	19	M16
32	140	105	80	42.7	52	62	43.1	30	22	35.1	6	4	2	4	19	M16
40	160	120	90	48.6	54	70	49.1	30	22	40.7	6	4.2	2	4	23	M20
50	165	130	105	60.5	57	84	61	30	22	52.2	8	4.4	2	8	19	M16
65	200	160	130	76.3	69	105	76.9	30	26	65.3	8	5.8	2	8	23	M20
80	210	170	140	89.1	73	118	89.7	30	28	76.4	8	6.1	2	8	23	M20
90	230	185	150	101.6	74	130	102	30	30	89.5	8	6.4	2	8	25	M22
100	240	195	160	114.3	76	142	115	30	32	101.5	8	6.8	2	8	25	M22
125	275	230	195	139.8	86	172	141	50	36	125.7	10	7.5	2	8	25	M22
150	325	275	235	165.2	95	202	166	50	38	150	10	8.1	2	12	27	M24
200	370	320	280	216.3	102	254	218	50	42	198.7	10	9.4	2	12	27	M24
250	450	390	345	267.4	118	312	269	50	48	247.5	12	10.6	2	12	33	M30 3
300	515	450	405	318.5	127	366	320	50	52	296.4	15	11.8	3	16	33	M30 3
350	560	495	450	355.6	134	406	357	80	54	331.8	15	12.7	3	16	33	M30 3
400	630	560	510	406.4	149	462	408	80	60	379.1	20	14.6	3	16	39	M36 3

UNI Flange Series 200 Thickness Calculation

UNI Flanges Wall Thickness
NPS (Normal Pipe Sizes)	Outside Daimeter (O.D.)	Schedule 10	Schedule 20	Schedule 30	STD Wall	Schedule 40	Schedule 60	EXT Hvy	Schedule 80	Schedule 100	Schedule 120	Schedule 140	Schedule 160	XX Hvy
½	0.84	0.083	...	...	0.109	0.109	...	0.147	0.147	...	...	...	0.188	0.294
¾	1.05	0.083	...	...	0.113	0.113	...	0.154	0.154	...	...	...	0.219	0.308
1	1.315	0.109	...	...	0.133	0.133	...	0.179	0.179	...	...	...	0.25	0.358
1 ¼	1.66	0.109	...	...	0.14	0.14	...	0.191	0.191	...	...	...	0.25	0.382
1 ½	1.9	0.109	...	...	0.145	0.145	...	0.2	0.2	...	...	...	0.281	0.4
2	2.375	0.109	...	...	0.154	0.154	...	0.218	0.218	...	...	...	0.344	0.436
2 ½	2.875	0.12	...	...	0.203	0.203	...	0.276	0.276	...	...	...	0.375	0.552
3	3.5	0.12	...	...	0.216	0.216	...	0.3	0.3	...	...	...	0.438	0.6
3 ½	4	0.12	...	...	0.226	0.226	...	0.318	0.318	...	...	...	...	0.636
4	4.5	0.12	...	...	0.237	0.237	...	0.337	0.337	...	0.438	...	0.531	0.674
5	5.563	0.134	...	...	0.258	0.258	...	0.375	0.375	...	0.5	...	0.625	0.75
6	6.625	0.134	...	...	0.28	0.28	...	0.432	0.432	...	0.562	...	0.719	0.864
8	8.625	0.148	0.25	0.277	0.322	0.322	0.406	0.5	0.5	0.594	0.719	0.812	0.906	0.875
10	10.75	0.165	0.25	0.307	0.365	0.365	0.5	0.5	0.594	0.719	0.844	1	1.125	1
12	12.75	0.18	0.25	0.33	0.375	0.406	0.562	0.5	0.688	0.844	1	1.125	1.312	1
14	14	0.25	0.312	0.375	0.375	0.438	0.594	0.5	0.75	0.938	1.094	1.25	1.406	...
16	16	0.25	0.312	0.375	0.375	0.5	0.656	0.5	0.844	1.031	1.219	1.438	1.594	...
18	18	0.25	0.312	0.438	0.375	0.562	0.75	0.5	0.938	1.156	1.375	1.562	1.781	...
20	20	0.25	0.375	0.5	0.375	0.594	0.812	0.5	1.031	1.281	1.5	1.75	1.969	...
22	22	0.25	...	...	0.375	...	...	0.5	...	...	....	....	....	....
24	24	0.25	0.375	0.562	0.375	0.688	0.969	0.5	1.219	1.531	1.812	2.062	2.344	....
26	26	....	....	....	0.375	....	....	0.5	....	....	....	....	....	....
30	30	0.312	0.5	0.625	0.375	....	....	0.5	....	....	....	....	....	....
36	36	0.312	0.5	0.625	0.375	0.75	....	0.5	....	....	....	....	....	....
40	40	....	....	....	0.375	....	....	0.5	....	....	....	....	....	....
42	42	……..	……..	……..	0.375	……..	……..	0.5	……..	……..	……..	……..	……..	……..
48	48	……..	……..	……..	0.375	……..	……..	0.5	……..	……..	……..	……..	……..	……..

UNI Flange For Steel Pipe Gasket

NPS	Gasket I.D.	Gasket O.D.
		Class 150	Class 300	Class 400	Class 600	Class 900
1/2	0.84	1.875	2.125	2.125	2.125	2.50
3/4	1.06	2.25	2.625	2.625	2.625	2.75
1	1.31	2.625	2.875	2.875	2.875	3.125
1 1/4	1.66	3	3.25	3.25	3.25	3.50
1 1/2	1.91	3.375	3.75	3.75	3.75	3.875
2	2.38	4.125	4.375	4.375	4.375	5.625
2 1/2	2.88	4.875	5.125	5.125	5.125	6.50
3	3.50	5.375	5.875	5.875	5.875	6.625
4	4.50	6.875	7.125	7.00	7.625	8.125
5	5.56	7.75	8.50	8.375	9.50	9.75
6	6.62	8.75	9.875	9.75	10.50	11.375
8	8.62	11	12.125	12.00	12.625	14.125
10	10.75	13.375	14.25	14.125	15.75	17.125
12	12.75	16.125	16.625	16.50	18.00	19.625