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

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.

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.

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.