What Is DIN 2576? German Flange Standard

Quick Answer

DIN 2576 is a German national standard for steel slip-on flanges rated PN 10. It was widely used in European piping before being superseded by EN 1092-1 (the harmonized European standard). Despite being officially replaced, DIN 2576 flanges are still referenced on older projects, in German-engineered plants, and in regions where DIN standards remain embedded in procurement practices. The dimensions of DIN 2576 flanges are identical to EN 1092-1 Type 01 PN 10 flanges.

DIN Flange Standards Overview

DIN published a series of flange standards, each covering a specific type and PN rating:

DIN Standard	Flange Type	PN Rating	EN 1092-1 Equivalent
DIN 2573	Slip-on (plate)	PN 6	Type 01 PN 6
DIN 2576	Slip-on (plate)	PN 10	Type 01 PN 10
DIN 2577	Slip-on (plate)	PN 16	Type 01 PN 16
DIN 2631	Welding neck	PN 6	Type 11 PN 6
DIN 2632	Welding neck	PN 10	Type 11 PN 10
DIN 2633	Welding neck	PN 16	Type 11 PN 16
DIN 2634	Welding neck	PN 25	Type 11 PN 25
DIN 2635	Welding neck	PN 40	Type 11 PN 40
DIN 2627	Blind	PN 10	Type 05 PN 10
DIN 2629	Blind	PN 25	Type 05 PN 25

DIN 2576 Dimensions

DN	Flange OD (mm)	Bolt Circle (mm)	Bolt Holes	Bolt Size	Thickness (mm)
50	165	125	4	M16	18
80	200	160	8	M16	20
100	220	180	8	M16	20
150	285	240	8	M20	22
200	340	295	8	M20	24
250	395	350	12	M20	26
300	445	400	12	M20	26

Dimensions identical to EN 1092-1 Type 01 PN 10.

Common Mistake

DIN 2576 is a slip-on plate flange (flat, no hub). It is suitable only for low-pressure utility service (water, air, low-pressure steam). Do not confuse it with DIN 2632 (welding neck PN 10), which has a hubbed design for higher integrity service. For process piping, always specify welding neck flanges (DIN 2632-2635 or EN 1092-1 Type 11).

DIN vs EN 1092-1: Current Status

All DIN flange standards have been officially superseded by EN 1092-1 since the European harmonization of the late 1990s. In practice:

• New projects should reference EN 1092-1
• Existing plants (especially German-designed) may still use DIN references
• Dimensions are identical: DIN 2576 = EN 1092-1 Type 01 PN 10
• Material specs differ: DIN used DIN 17100/17102; EN uses EN 10222/10025
• CE marking: EN 1092-1 flanges carry CE marking under PED; DIN flanges may not

Pro Tip

When a project specification references DIN 2576, substitute EN 1092-1 Type 01 PN 10 for procurement. The dimensions are identical, and modern manufacturers produce flanges to EN 1092-1 with dual-stamp (DIN/EN) markings. Confirm with the project engineer if any plant-specific DIN requirements apply beyond standard EN 1092-1 dimensions.

Read the full guide to flanges