PN100 Flange Dimensions (EN 1092-1 Type 11, DN10 to DN350)

Reference manual hosted for technician access. 1 pages.

Brand

EN 1092-1 PN100

Equipment

Type 11 raised-face weld-neck flange

Document type

Dimensional reference

Revision

EN 1092-1

Issued

2026-06-16

Pages

Format

PDF (application/pdf)

PN100 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 (M24), DN100 (210 mm bolt circle, 8 x M27) and DN150. Values cross-checked across three independent sources.

PN100 flange dimensions (EN 1092-1 Type 11, DN10 to DN350)

PN100 is the EN 1092-1 pressure rating for a nominal 100 bar flange. The PN number fixes the bolt pattern, so a PN100 DN100 flange from any maker shares the same 265 mm outside diameter, 210 mm bolt circle and eight M27 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 three independent sources.

DN	Flange OD D (mm)	Bolt circle K (mm)	Bolt hole (mm)	No. of bolts	Bolt size	Flange thick C (mm)
DN10	100	70	14	4	M12	20
DN15	105	75	14	4	M12	20
DN20	130	90	18	4	M16	22
DN25	140	100	18	4	M16	24
DN32	155	110	22	4	M20	24
DN40	170	125	22	4	M20	26
DN50	195	145	26	4	M24	28
DN65	220	170	26	8	M24	30
DN80	230	180	26	8	M24	32
DN100	265	210	30	8	M27	36
DN125	315	250	33	8	M30	40
DN150	355	290	33	12	M30	44
DN200	430	360	36	12	M33	52
DN250	505	430	39	12	M36	60
DN300	585	500	42	16	M39	68
DN350	655	560	48	16	M45	74

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, 22 mm M20, 26 mm M24, 30 mm M27, 33 mm M30, 36 mm M33, 39 mm M36, 42 mm M39 and 48 mm M45.

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 PN100 flange will not mate to a PN40 or an ASME Class flange of the same DN even though the bore is the same — the bolt circle and hole count differ. EN 1092-1 also defines the facing (Type B1 raised face is the common PN100 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 PN100 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.

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Reference compiled for identification and cross-reference. Dimensions are nominal; confirm against the controlling EN 1092-1 PN100 EN 1092-1 revision and the specific component data sheets before manufacture or procurement. All trademarks are the property of their respective owners.