PN10 Flange Dimensions (EN 1092-1 Type 11, DN10 to DN350)

Dimensional reference compiled by cBallast. 1-page PDF; the full content is on this page.

Compiled by

cBallast

Subject

Type 11 raised-face weld-neck flange

Document type

Dimensional reference

Reference

EN 1092-1

Issued

2026-06-19

Pages

Format

Web page and PDF

PN10 flange dimensions to EN 1092-1: flange outside diameter D, bolt-circle diameter K, bolt-hole size, number of bolts, bolt size and flange thickness C for Type 11 weld-neck flanges from DN10 through DN350. Includes DN50 (165 mm OD, 4 x M16), DN100 (180 mm bolt circle, 8 x M16) and DN150 (8 x M20). The common low-pressure (10 bar) rating; dimensionally identical to PN16 up to DN150. Values cross-checked across two independent reference tables.

PN10 flange dimensions (EN 1092-1 Type 11, DN10 to DN350)

PN10 is the EN 1092-1 pressure rating for a nominal 10 bar flange and the common rating for low-pressure water, HVAC, pump and general process service. The PN number fixes the bolt pattern, so a PN10 DN100 flange from any maker shares the same 220 mm outside diameter, 180 mm bolt circle and eight M16 bolts. The values below are the EN 1092-1 nominal dimensions for the Type 11 raised-face weld-neck flange across the common DN10 to DN350 range, cross-checked across two independent reference tables.

DN	Flange OD D (mm)	Bolt circle K (mm)	Bolt hole (mm)	No. of bolts	Bolt size	Flange thick C (mm)
DN10	90	60	14	4	M12	16
DN15	95	65	14	4	M12	16
DN20	105	75	14	4	M12	18
DN25	115	85	14	4	M12	18
DN32	140	100	18	4	M16	18
DN40	150	110	18	4	M16	18
DN50	165	125	18	4	M16	18
DN65	185	145	18	8	M16	18
DN80	200	160	18	8	M16	20
DN100	220	180	18	8	M16	20
DN125	250	210	18	8	M16	22
DN150	285	240	22	8	M20	22
DN200	340	295	22	8	M20	24
DN250	395	350	22	12	M20	26
DN300	445	400	22	12	M20	26
DN350	505	460	22	16	M20	26

Bolt holes are drilled on the bolt circle K, straddling the centreline and equally spaced. The bolt size is the largest that passes the listed hole: 14 mm holes take M12, 18 mm M16 and 22 mm M20. PN10 keeps the same M16 bolt from DN32 to DN125, stepping up to M20 from DN150 to DN350.

Reading the dimensions

D — the flange outside diameter; the overall diameter of the flange disc.
K — the bolt-circle diameter (PCD), the circle through the bolt-hole centres. This is the figure to lay out or check drilling against and the single most important number for matching a mating flange.
Bolt hole — the drilled hole diameter; the clearance over the bolt lets two flanges line up.
Number of bolts — always a multiple of four and equally spaced, so the flange turns in quarter steps; both mating flanges share the same count.
Bolt size — the metric thread of the through-bolt or stud. Use the full set.
C — the flange disc thickness, excluding the raised face and the weld-neck hub.

Selecting and matching

Two flanges bolt together only when the pressure rating, DN, bolt circle K and bolt pattern all agree, so confirm all four before ordering. A PN10 flange will not mate to a PN25 or an ASME Class flange of the same DN even though the bore is the same — the bolt circle and hole count differ. PN10 and PN16 to EN 1092-1 are dimensionally identical from DN10 through DN150, so DN15 to DN150 flanges interchange freely between the two ratings; at DN200 they share the same outside diameter, bolt circle, hole and bolt size but PN10 uses eight bolts where PN16 uses twelve, and above DN200 the two ratings diverge in diameter as well. EN 1092-1 also defines the facing (Type B1 raised face is the common PN10 facing) and the flange material group, which set the gasket and bolt grade for the temperature and pressure. The dimensions above are for the Type 11 weld-neck flange; blind, plate and slip-on PN10 flanges to EN 1092-1 share the same D, K, bolt hole, bolt count and bolt size.

Dimensions are nominal EN 1092-1 values and provided for identification and cross-reference. Confirm against the controlling standard and the specific flange maker’s current data sheet before manufacture or procurement.

Frequently asked questions

What are the dimensions of a DN50 PN10 flange?: A DN50 PN10 flange to EN 1092-1 is 165 mm outside diameter with four 18 mm holes (M16 bolts) on a 125 mm bolt circle — identical drilling to DN50 PN16.
What are the dimensions of a DN100 PN10 flange?: DN100 PN10: 220 mm outside diameter, 180 mm bolt circle, eight M16 bolts — the same pattern as PN16 at this size.
Up to which size do PN10 and PN16 share dimensions?: Through DN150 the EN 1092-1 drilling is the same; from DN200 the two ratings use different bolt circles and bolt counts.
Is a PN10 flange strong enough for 10 bar?: PN10 denotes a 10 bar nominal rating at reference temperature; the allowable pressure falls with temperature per the material group tables in EN 1092-1, so check the pressure–temperature rating, not just the PN number.

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Reference compiled for identification and cross-reference. Dimensions are nominal; confirm against the controlling EN 1092-1 PN10 EN 1092-1 revision and the specific component data sheets before manufacture or procurement. All trademarks are the property of their respective owners.