SANS 1123 Flanges | Table 600-4000 | South African Standard

SANS 1123, also known as SABS 1123, is the South African National Standard that sets the requirements for materials, dimensions, tolerances, and pressure ratings of steel pipe flanges and flanged fittings. It is recognized across Southern Africa and on many international projects as a way to keep piping connections safe and reliable. The standard covers weld neck, slip-on, blind, plate, and threaded flanges, made mainly in carbon steel, stainless steel, and alloy materials for moderate to high-pressure service. PM Industries manufactures, supplies, and stocks these flanges in a full range of tables, sizes, and grades.

SANS 1123 defines several pressure classes by nominal rating, usually from 600 kPa (6 bar) up to 4000 kPa (40 bar). Common designations include Table 600/3, 1000/3, 1600/3, 2500/3, and 4000/3, where the number gives the pressure rating in kPa. Each table pins down the dimensions that make flanges interchangeable: outer diameter, bolt circle (PCD), the number and size of bolt holes, raised face dimensions, and flange thickness. Sizes generally run from DN 10 (15 NB) up to DN 1000 and larger, so the standard suits both small-bore and large-diameter pipelines.

A big strength of SANS 1123 flanges is a design suited to local operating conditions, across the temperatures and media found in mining, petrochemical, water treatment, power generation, and general industrial work. Matched with the right gasket, they seal well, and they are built to take internal pressure along with the mechanical stress from thermal expansion, vibration, and external loads. We select materials for good weldability, corrosion resistance, and mechanical strength, with grade options to match the service.

Standardized bolt patterns and facing finishes, often a raised face (RF) for better gasket compression, make these flanges easy to install and maintain. Engineers frequently compare them to BS 10 Table D/E or EN 1092-1 PN ratings, which helps on mixed-standard projects, and compliance keeps you aligned with South African pressure-equipment safety rules. We produce SANS 1123 flanges by forging or casting followed by precision machining to hold tight tolerances. Getting the pressure, temperature, fluid corrosiveness, and facing type right is what protects service life and system integrity. Tell us your table, size, face, and material, and we will quote it.

Specification SANS 1123 Flanges

Standards	ANSI/ASME B16.5, B16.48, ANSI Flanges, GOST Flanges, DIN Flanges, EN-1092, B16.47 Series A & B, ASME Flanges, EN Flanges, AWWA Flanges, BS Flanges.
JIS Standard	5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
DIN FLANGES	DIN 2527, 2627, 2631, 2656, 2576, 2673, 2629, 2628, 2566, 2641, 2637, 2655, 2634, 2636, 2632, 2633, 2638, 2642, 2573, 2635.
Pressure Rating	Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
Types	Threaded, Plate, Screwed, Forged.
Supporting material	Gasket, Ring Joint, Flange Bolts
Size range	1/2" (15 NB) to 48" (1200NB) DN10~DN5000
Production technique	Forged, machined and Heat treated
Available Flange Type	Weld Neck Flanges, RTJ Flanges, Slip On Flanges, Spectacle Blind Flanges, Flanges Gaskets, Square Flanges, Standard Insert Flanges, High Hub Blinds Flanges, Flat Flanges, forged flanges, Weldo / Nipo Flanges, Jacket Insert Flanges, Tongue groove Flanges, Blind Flanges, Socket Weld Flanges, Large diameter Flanges, Long Weld Neck Flanges, Spacer Blinds, SWRF Flanges, SORF Flanges, Angle Face Rings Flanges, Spades Ring Spacers Flanges, WNRF Flanges, Screwed Flanges, Insert Flanges, flanges bolts, cf flange, Lap Joint Flanges, ASME B16.36 Orifice Flanges, Plate Flange, Expander Flanges, Ring Type Joint Flanges, Loose Flanges, Reducing Flanges, puddle flange, Threaded Flanges, blank flange, vacuum flange.
Connect Type/ Flange Face Type	Ring Type Joint (RTJ), Flat Face (FF), Tongue & Groove, Small Male-Female (SMF), Lap-Joint Face (LJF), Raised Face (RF), Large Male-Female (LMF), Small Tongue.
Custom design	As per your drawing
Test	Direct-reading Spectrograph, X-ray detector, UItrasonic flaw detector, Magnetic particle detector, Hydrostatic testing machine.
Origin	Indian / USA / Korean / West Europe / Japan
Pressure Class	PN 6 TO PN 100
Thickness	Normal Pipe Size ≤ 18
Bore Diameter	Normal Pipe ≤ 10
High Temperature	Above 200°C (400°F) For Class 150 Or Above 400°C (750°F)
Low Temperature	Above -29 Degree C (−20°F)
Coating/Surface Treatment:	Zinc Plated, Anti-rust Paint, Oil Black Paint, Yellow Transparent, Cold and Hot Dip Galvanized.
European/African/Russian Standard Flanges	Available
Gaskets Types	Full Face, Metallic Ring, Flat Ring Gasket
Marking Standard	Name of Manufacturer
	Schedule
	Type of Flange Facing
	Pressure Class
	Nominal Pipe Size, etc
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
	Raw Materials Certificate
	100% Radiography Test Report
	Third Party Inspection Report, etc

Flange Type Available

Sans 1123 Flange Dimensions

Nominal Bore 15	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600/3	80	55	4	M10	11	10
1123-1000/3	95	65	4	M12	14	10
1123-1600/3	95	65	4	M12	14	10
1123-2500/3	95	65	4	M12	14	14
1123-4000/3	95	65	4	M12	14	14
Nominal Bore 20	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	90	65	4	M10	11	10
1123-1000	105	75	4	M12	14	10
1123-1600	105	75	4	M12	14	10
1123-2500	105	75	4	M12	14	14
1123-4000	105	75	4	M12	14	14
Nominal Bore 25	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	100	75	4	M10	11	10
1123-1000	115	85	4	M12	14	10
1123-1600	115	85	4	M12	14	10
1123-2500	115	85	4	M12	14	16
1123-4000	115	85	4	M12	14	16
Nominal Bore 32	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	120	90	4	M12	14	10
1123-1000	140	100	4	M16	18	10
1123-1600	140	100	4	M16	18	10
1123-2500	140	100	4	M16	18	18
1123-4000	140	100	4	M16	18	18
Nominal Bore 40	Flange Diameter	PCD	>Bolts	Boltsize	Hole Size	Thickness
1123-600	130	100	4	M12	14	10
1123-1000	150	110	4	M16	18	10
1123-1600	150	110	4	M16	18	10
1123-2500	150	110	4	M16	18	20
1123-4000	150	110	4	M16	18	20
Nominal Bore 50	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	140	110	4	M12	14	10
1123-1000	165	125	4	M16	18	10
1123-1600	165	125	4	M16	18	12
1123-2500	165	125	4	M16	18	20
1123-4000	165	125	4	M16	18	20
Nominal Bore 65	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	160	130	4	M12	14	10
1123-1000	185	145	4	M16	18	12
1123-1600	185	145	4	M16	18	12
1123-2500	185	145	8	M16	18	22
1123-4000	185	145	8	M16	18	22
Nominal Bore 80	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	190	150	4	M16	18	10
1123-1000	200	160	8	M16	18	12
1123-1600	200	160	8	M16	18	14
1123-2500	200	160	8	M16	18	22
1123-4000	200	160	8	M16	18	22
Nominal Bore100	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	210	170	4	M16	18	10
1123-1000	220	180	8	M16	18	12
1123-1600	220	180	8	M16	18	14
1123-2500	235	190	8	M20	22	25
1123-4000	235	190	8	M20	22	25
Nominal Bore150	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	240	200	8	M16	18	12
1123-1000	250	210	8	M16	18	14
1123-1600	250	210	8	M16	18	16
1123-2500	270	220	8	M24	26	28
1123-4000	270	220	8	M24	26	28
Nominal Bore200	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	265	225	8	M16	18	12
1123-1000	285	240	8	M20	22	16
1123-1600	285	240	8	M20	22	18
1123-2500	300	250	8	M24	26	30
1123-4000	300	250	8	M24	26	30
Nominal Bore250	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	320	280	8	M16	18	14
1123-1000	340	295	8	M20	22	18
1123-1600	340	295	12	M20	22	22
1123-2500	360	310	12	M24	26	28
1123-4000	375	320	12	M24	26	32
Nominal Bore300	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	375	335	12	M16	18	16
1123-1000	395	350	12	M20	22	20
1123-1600	405	355	12	M24	26	25
1123-2500	425	370	12	M24	26	30
1123-4000	450	385	12	M30	33	38
Nominal Bore500	Flange Diameter	PCD	Bolts	Boltsize	Hole Size	Thickness
1123-600	645	600	20	M20	22	25
1123-1000	670	620	20	M24	26	32
1123-1600	715	650	20	M30	33	40
1123-2500	730	660	20	M30	33	50
1123-4000	755	670	20	M39	39	70

Dimensions of Sabs 1123 600 kPa Flange

Nominal pressure 600 kPa 600/2 = Table 4 600/4 = Table 6 600/3 = Table 5 600/8 = Table 8
NB	Pipe O.D. d1	Flange							Raised Face		Bolt	Drilling			Neck			Boss
		D	b	b1	b2	b3	h	h1	d4	f		No.	d2	k	d3	h2	r	d5
10	17.2	75	8	10	8	10	16	28	35	2	M10	4	11	50	26	6	4	25
15	21.3	80	8	10	8	10	16	30	40	2	M10	4	11	55	30	6	4	30
20	26.9	90	8	10	8	10	18	32	50	2	M10	4	11	65	38	6	4	40
25	33.7	100	8	10	8	10	18	35	60	2	M10	4	11	75	42	6	4	50
32	42.4	120	8	10	8	10	20	35	70	2	M12	4	14	90	55	6	6	60
40	48.3	130	8	10	8	10	20	38	80	3	M12	4	14	100	62	7	6	70
50	60.3	140	8	10	8	10	22	38	90	3	M12	4	14	110	74	8	6	80
65	76.1	160	8	10	8	10	26	38	110	3	M12	4	14	130	88	9	6	100
80	88.9	190	10	10	10	10	28	42	128	3	M16	4	18	150	102	10	8	110
100	114.3	210	10	10	10	10	34	45	148	3	M16	4	18	170	130	10	8	130
*125	139.7	240	13	12	13	12	39	48	178	3	M16	8	18	200	155	10	8	160
150	168.3	265	13	12	13	12	39	48	202	3	M16	8	18	225	184	12	10	185
*175	193.7	295	13	14	-	14	-	52	230	3	M16	8	18	255	210	12	10	-
200	219.1	320	13	14	-	14	-	55	258	3	M16	8	18	280	236	15	10	-
*225	244.5	345	16	16	-	16	-	58	285	3	M16	8	18	305	264	15	12	-
250	273	375	16	16	-	16	-	60	312	3	M16	12	18	335	290	15	12	-
300	323.9	440	20	20	-	20	-	62	365	4	M20	12	22	395	342	15	12	-
350	355.6	490	22	22	-	22	-	62	415	4	M20	12	22	445	385	15	12	-
400	406.4	540	22	22	-	22	-	65	465	4	M20	16	22	495	438	15	12	-
450	457.2	595	24	25	-	25	-	65	520	4	M20	16	22	550	492	15	12	-
500	508	645	24	25	-	25	-	68	570	4	M20	20	22	600	538	15	12	-
550	559	705	24	28	-	28	-	68	620	5	M24	20	26	655	590	16	12	-
600	609.6	755	24	30	-	30	-	70	670	5	M24	20	26	705	640	16	12	-
* NP = Nominal Pressure 600kPa, 1000kPa, 1600kPa, 2500kPa, 4000kPa

Sabs 1123 Class 1000 KPA Pipe Flanges Dimensions Schedule

Nominal pressure 1000 kPa 1000/2 = Table 9 1000/4 = Table 11 1000/3 = Table 10 1000/8 = Table 13
NB	Pipe O.D. d1	Flange							Raised Face		Bolt	Drilling			Neck			Boss
		D	b	b1	b2	b3	h	h1	d4	f		No.	d2	k	d3	h2	r	d5
10	17.2	90	8	10	8	10	14	35	40	2	M12	4	14	60	28	6	4	30
15	21.3	95	8	10	8	10	14	35	45	2	M12	4	14	65	32	6	4	35
20	26.9	105	8	10	8	10	16	38	58	2	M12	4	14	75	40	6	4	45
25	33.7	115	8	10	8	10	16	38	68	2	M12	4	14	85	46	6	4	52
32	42.4	140	10	10	10	10	20	40	78	2	M16	4	18	100	56	6	6	60
40	48.3	150	10	10	10	10	20	42	88	3	M16	4	18	110	64	7	6	70
50	60.3	165	12	10	10	12	20	45	102	3	M16	4	18	125	75	8	6	85
65	76.1	185	12	12	12	12	26	45	122	3	M16	4	18	145	90	10	6	105
80	88.9	200	14	12	12	14	26	50	138	3	M16	8	18	160	105	10	8	118
100	114.3	220	14	12	12	14	32	52	158	3	M16	8	18	180	131	12	8	140
*125	139.7	250	16	14	14	16	36	55	188	3	M16	8	18	210	156	12	8	168
150	168.3	285	18	16	16	18	38	55	212	3	M20	8	22	240	184	12	10	195
*175	193.7	315	18	16		18		60	242	3	M20	8	22	270	210	12	10
200	219.1	340	18	18		18		62	268	3	M20	8	22	295	235	16	10
*225	244.5	370	18	18		18		62	290	3	M20	8	22	325	265	16	10
250	273.0	395	20	20		20		68	320	3	M20	12	22	350	292	16	12
300	323.9	445	22	22		22		68	370	4	M20	12	22	400	344	16	12
350	355.6	505	26	25		25		68	430	4	M20	16	22	460	385	16	12
400	406.4	565	26	25		25		72	482	4	M24	16	26	515	400	16	12
450	457.2	615	28	30		30		72	532	4	M24	20	26	565	492	16	12
500	508.0	670	28	32		32		75	585	4	M24	20	26	620	542	16	12
550	559.0	730	28	35		35		80	635	5	M24	20	26	675	592	18	12
600	609.6	780	28	38		38		80	685	5	M24	20	26	725	642	18	12
* NP = Nominal Pressure 600kPa, 1000kPa, 1600kPa, 2500kPa, 4000kPa

Sans 1123 1600 Kpa Flanges Dimension Standard

Nominal pressure 1600 kPa 1600/2 = Table 14 1600/4 = Table 16 1600/3 = Table 15 1600/8 = Table 18
NB	Pipe O.D. d1	Flange							Raised Face		Bolt	Drilling			Neck			Boss
		D	b	b1	b2	b3	h	h1	d4	f		No.	d2	k	d3	h2	r	d5
10	17.2	90	8	10	8	10	14	35	40	2	M12	4	14	60	28	6	4	30
15	21.3	95	8	10	8	10	14	35	45	2	M12	4	14	65	32	6	4	35
20	26.9	105	8	10	8	10	16	38	58	2	M12	4	14	75	40	6	4	45
25	33.7	115	8	10	8	10	16	38	68	2	M12	4	14	85	46	6	4	52
32	42.4	140	10	10	10	10	20	40	78	2	M16	4	18	100	56	6	6	60
40	48.3	150	10	10	10	10	20	42	88	3	M16	4	18	110	64	7	6	70
50	60.3	165	12	12	12	12	22	45	102	3	M16	4	18	125	75	8	6	85
65	76.1	185	12	12	12	12	26	45	122	3	M16	4	18	145	90	10	6	105
80	88.9	200	14	14	14	14	28	50	138	3	M16	8	18	160	105	10	8	118
100	114.3	220	14	14	14	14	34	52	158	3	M16	8	18	180	131	12	8	140
*125	139.7	250	16	16	16	16	38	55	188	3	M16	8	18	210	156	12	8	168
150	168.3	285	18	18	18	18	40	55	212	3	M20	8	22	240	184	12	10	195
*175	193.7	315	20	20		20		60	242	3	M20	8	22	270	210	12	10
200	219.1	340	22	22		22		62	268	3	M20	12	22	295	235	16	10
*225	244.5	370	24	22		22		66	294	3	M20	12	22	325	265	16	10
250	273.0	405	24	25		25		70	320	3	M24	12	26	355	292	16	12
300	323.9	460	28	28		28		78	378	4	M24	12	26	410	344	16	12
350	355.6	520	30	30		30		82	438	4	M24	16	26	470	390	16	12
400	406.4	580	32	35		35		85	490	4	M24	16	26	525	445	16	12
450	457.2	640	34	40		40		87	550	4	M24	20	26	585	496	16	12
500	508.0	715	34	40		40		90	610	4	M30	20	33	650	548	16	12
550	559.0	775	36					95	670	5	M30	20	33	710	600	18	12
600	609.6	840	36	50				95	725	5	M30	20	33	770	652	18	12
* NP = Nominal Pressure 600kPa, 1000kPa, 1600kPa, 2500kPa, 4000kPa

Sabs 1123 Class 2500 Flange Dimension Table

Nominal pressure 2500 kPa 2500/2 = Table 19 2500/4 = Table 21 2500/3 = Table 20 2500/8 = Table 23
NB	Pipe O.D. d1	Flange							Raised Face		Bolt	Drilling			Neck			Boss
		D	b	b1	b2	b3	h	h1	d4	f		No.	d2	k	d3	h2	r	d5
10	17.2	90	12	12	10	12	16	35	40	2	M12	4	14	60	28	6	4	30
15	21.3	95	14	14	11	14	17	38	45	2	M12	4	14	65	32	6	4	35
20	26.9	105	14	14	11	14	19	40	58	2	M12	4	14	75	40	6	4	45
25	33.7	115	16	16	12	16	22	40	68	2	M12	4	14	85	46	6	4	52
32	42.4	140	18	18	14	18	26	42	78	2	M16	4	18	100	55	6	6	60
40	48.3	150	18	20	14	20	28	45	88	3	M16	4	18	110	64	7	6	70
50	60.3	165	20	20	17	20	31	48	102	3	M16	4	18	125	75	8	6	85
65	76.1	185	22	22	17	22	33	52	122	3	M16	8	18	145	90	10	6	105
80	88.9	200	24	22	18	22	34	58	138	3	M16	8	18	160	105	12	8	118
100	114.3	235	24	25	21	25	41	65	162	3	M20	8	22	190	134	12	8	145
*125	139.7	270	26	28	24	28	46	68	188	3	M24	8	26	220	162	12	8	170
150	168.3	300	28	30	24	30	48	75	218	3	M24	8	26	250	192	12	10	200
*175	193.7	330	30	30		25		75	248	3	M24	12	26	280	218	15	10
200	219.1	360	30	30		30		80	278	3	M24	12	26	310	244	16	10
*225	244.5	395	30	30		30		84	306	3	M24	12	26	340	270	16	10
250	273.0	425	30	30		30		88	335	3	M24	12	26	370	298	18	12
300	323.9	485	34	32		32		92	395	4	M24	16	26	430	352	18	12
350	355.6	555	38	35		35		100	450	4	M30	16	33	490	398	20	12
400	406.5	620	40	40		40		110	505	4	M30	16	33	550	452	20	12
450	457.2	670	42	45		45		110	555	4	M30	20	33	600	505	20	12
500	508.0	730	44	50		50		125	615	4	M30	20	33	660	558	20	12
550	559.0	785		55					670	5	M36	20	39	710
600	609.6	845	46	60				125	720	5	M36	20	39	770	660	20	12
* NP = Nominal Pressure 600kPa, 1000kPa, 1600kPa, 2500kPa, 4000kPa