PN16 Flange Dimensions (EN 1092-1 Type 11, DN10 to DN350)

Reference manual hosted for technician access. 1 pages.

Brand

EN 1092-1 PN16

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)

PN16 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). Values cross-checked across two independent reference tables.

PN16 flange dimensions (EN 1092-1 Type 11, DN10 to DN350)

PN16 is the EN 1092-1 pressure rating for a nominal 16 bar flange and the most common rating for general water, HVAC and process service. The PN number fixes the bolt pattern, so a PN16 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	14
DN15	95	65	14	4	M12	14
DN20	105	75	14	4	M12	14
DN25	115	85	14	4	M12	16
DN32	140	100	18	4	M16	16
DN40	150	110	18	4	M16	16
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	12	M20	24
DN250	405	355	26	12	M24	26
DN300	460	410	26	12	M24	28
DN350	520	470	26	16	M24	30

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 and 26 mm M24. PN16 keeps the same M16 bolt from DN32 to DN125, stepping up to M20 at DN150 and M24 at DN250.

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 PN16 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. Up to DN150 the PN10 and PN16 bolt patterns in EN 1092-1 are identical, so many DN15 to DN150 flanges interchange between the two ratings; above DN150 the patterns diverge. EN 1092-1 also defines the facing (Type B1 raised face is the common PN16 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 PN16 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.

Open / Download PDF

Reference compiled for identification and cross-reference. Dimensions are nominal; confirm against the controlling EN 1092-1 PN16 EN 1092-1 revision and the specific component data sheets before manufacture or procurement. All trademarks are the property of their respective owners.