DIN 2543 Slip-On Flange PN 16 — Full Dimensions

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STANDARDS

DIN 2543 specifies slip-on flanges (also called plate slip-on or SO flanges) with a PN 16 pressure rating. The pipe slips into the flange bore and is fillet-welded on both the inside and outside. This type offers easier alignment and lower machining costs compared to welding neck flanges, making it suitable for lower-pressure applications where assembly convenience is valued. Covers sizes DN 10 to DN 600.

View Other Standards:

DIN 2527 Blind DIN 2544 Flat Plate DIN 2545 Weld Neck EN 1092-1 JIS B2220

DIN 2543 — Slip-On Flange PN 16 PN 16

DIN 2543 specifies slip-on flanges with a PN 16 pressure rating. The pipe slips into the flange bore and is fillet-welded on both the inside and outside. Easier alignment and lower machining costs compared to welding neck flanges.

Key Specifications

Type: Slip-On (Plate)

Pressure: PN 16 (16 bar)

Size Range: DN 10 – DN 600

Face Type: Raised Face (RF)

Temperature: Up to 120°C at full PN 16; derated above 120°C

Pipe OD: ISO R64 / DIN standard

DIN 2543 PN 16 — Full Dimension Table

DN	Pipe OD d₁ (mm)	Flange OD D (mm)	Thickness b (mm)	Bolt Circle k (mm)	Bolt Holes	Bolt Size	RF d₄ (mm)	Approx. Weight (kg)
10	14	90	14	60	4	M12	40	0.72
15	20	95	14	65	4	M12	45	0.81
20	25	105	16	75	4	M12	58	1.24
25	30	115	16	85	4	M12	68	1.38
32	38	140	16	100	4	M16	78	2.03
40	44.5	150	16	110	4	M16	88	2.35
50	57	165	18	125	4	M16	102	2.88
65	76.1	185	18	145	4	M16	122	4.29
80	88.9	200	20	160	8	M16	138	5.88
100	108	220	20	180	8	M16	158	5.65
125	133	250	22	210	8	M16	188	9.40
150	159	285	22	240	8	M20	212	12.90
200	216	340	24	295	12	M20	268	16.10
250	267	405	26	355	12	M24	320	28.50
300	318	460	28	410	12	M24	378	35.10
350	368	520	32	470	16	M27	438	58.00
400	419	580	32	525	16	M27	490	39.30
500	521	715	34	650	20	M30	610	102.0
600	622	840	36	770	20	M33	725	—

Table 1: DIN 2543 PN 16 Slip-On Flange Dimensions. Pipe OD per ISO R64. Bolt sizes: M12 (DN10–25), M16 (DN32–100), M20 (DN150–200), M24 (DN250–300), M27 (DN350–400), M30 (DN500), M33 (DN600).

Bolt Size Progression by DN

DN Range	Bolt Size	Number of Bolts
DN 10 – DN 25	M12	4
DN 32 – DN 100	M16	4 / 8
DN 125 – DN 150	M16	8
DN 200	M20	12
DN 250 – DN 300	M24	12
DN 350 – DN 400	M27	16
DN 500	M30	20
DN 600	M33	20

Table 2: DIN 2543 PN 16 bolt size and quantity by DN size range.

⚠ Temperature Derating

PN 16 rating is valid up to 120°C. Between 120°C and 300°C, allowable pressure decreases as material yield strength reduces. Consult HT PIPE engineering for elevated-temperature applications above 120°C.

Materials

Carbon Steel (Forged): ASTM A105, A350 LF1/LF2/LF3

Stainless Steel (Cast): ASTM A351 CF8 (304), CF8M (316)

Stainless Steel (Forged): ASTM A182 F304, F304L, F316, F316L, F304H, F316H

Alloy Steel: ASTM A182 F11, F12

Inconel: 600, 625, 718, 800, 825
Hastelloy: C276, B2, B3, C2000

Monel: 400, K500

Applications

Water pipelines and municipal distribution systems
General industrial piping (non-critical service)
Low-pressure steam and condensate lines
HVAC and heating systems
Process plant utility piping

⚠ Design Note

Slip-on flanges rely on the fillet weld for strength. They are not recommended for cyclic loading or high-vibration service. For critical applications, use welding neck flanges (DIN 2545 / EN 1092-1 Type 11) instead.

Flange Material Selection Guide

Material	Grade	Max Temp	Key Application
Carbon Steel	ASTM A105	425°C	Steam, water, air, oil
Stainless Steel 316	A182 F316	400°C	Chemical, food, pharma
Stainless Steel 316L	A182 F316L	400°C	Weld-intensive fabrication
Stainless Steel 304	A182 F304	400°C	General corrosive service
Alloy Steel F11	A182 F11 (1CrMo)	550°C	Power plant, high-temp steam

Table 3: Material selection guide for DIN 2543 slip-on flanges. Verify material compatibility with process media and operating temperature.

PN Class vs ANSI/ASME Pressure Equivalent

PN Class	Max Pressure (bar)	ANSI/ASME Equivalent
PN 6	6 bar / 87 psi	—
PN 10	10 bar / 145 psi	Class 150
PN 16	16 bar / 232 psi	Class 150–300
PN 25	25 bar / 363 psi	Class 300
PN 40	40 bar / 580 psi	Class 300–600

Table 4: PN pressure class vs ANSI/ASME equivalent. Approximate equivalencies only — always verify dimensional compatibility before mixing standards.

HT PIPE manufactures DIN 2543 slip-on flanges in carbon steel, stainless steel, and alloy materials. All flanges supplied with EN 10204 3.1 material test reports. Contact our engineering team for quotation and dimensional verification.

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