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UNI 2281 PN10 Weld Neck Flanges

UNI 2281 PN10 weld neck flange dimensions.

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Reference scope

Common order references

Standard / Type	Product	Typical scope
UNI 2281 PN10 weld neck flange	Product type	Dimensions and specification tables below
Documents	Material certificate	EN 10204 3.1 by request
Production release	Approved drawing / standard edition	Released against the controlled order file

Product data

Dimensions and specification tables

ITALY STANDARD UNI 2281 PN10 WELDING NECK FLANGE RF DIMENSIONS TABLE

Directions for the designation	d1	a	b	D	f	h	h1	m	r	s	Holes	Screws	Weight*
Rated Diameter	External diameter of the pipe	Kg
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
*	The weight is approximate and calculated on base 7.85 Kg/dm3
**	For PN10 the flange should have 4 holes

Use these tables for RFQ preparation. Final production should be confirmed against the required standard edition, drawing, material grade and certificate requirement.

Supply notes

Supply and order notes

Specification support from Hyupshin

Use the dimensions and RFQ notes below to check the required standard, size range, pressure rating, material grade and certificate needs before sending an inquiry.

How we prepare the production item

Our quotation records the standard number, flange type, nominal size, pressure rating, material grade, facing, quantity and document scope, with project drawings linked to the same production item.

Product scope

UNI 2281 PN10 weld neck flange can be quoted in carbon steel, stainless steel or project material grades when the order specification, dimensions and certificate requirements are confirmed.

Technical purchasing support

How Hyupshin turns the specification into a controlled flange order.

Dimension control

UNI production dimensions

Our technical team compares the requested standard edition and project drawing, then releases the applicable dimensions to production.

Pressure and facing

PN10

We record the PN rating, sealing-face form, surface finish and tolerance notes on each PN-rated quotation line.

Product geometry

Weld Neck manufacturing details

Flange type, sealing face, drilling, thickness and machining details are checked together so production and inspection use the same specification.

Documents

Certificate and inspection records

Our order file carries the agreed EN 10204 3.1, PED, AD 2000, UKCA, PMI, NDT and third-party inspection scope through to shipment.

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Send the standard, flange type, DN, PN, sealing face, material grade, quantity, certificate requirement and any project drawing.

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