ASTM A105 Flange | Specification | Dimension

ASTM A105 flange is a common carbon steel flange widely used in various industries. As a professional flange manufacturer and exporter, ZIZI can provide customers with various standard carbon steel flanges. We have professional production equipment and huge stocks.

What is ASTM A105 Standard ?

ASTM A105 flange standard covers forged carbon steel piping components, that is, flanges, fittings, valves, and similar parts, for use in pressure systems at ambient and higher-temperature service conditions. Materials shall be subjected to heat treatment (annealing, normalizing, tempering, or quenching). Material shall conform to carbon, manganese, phosphorus, sulfur, silicon, copper, nickel, chromium, molybdenum and vanadium contents. The forgings shall be subjected to tension, hardness and hydrostatic tests, with the latter applicable when required. Material shall adhere to tensile strength, yield strength, elongation, reduction of area, and hardness requirements.

ASTM A105 Flange Specification

Product	WN Flange/SO Flange/SW Flange/TH Flange/LAPJ Flange/Blind Flange
Material	ASTM A105
Sealing surface	RF , FF , RJ
Size Range	1/2” – 60” / DN15 – DN1500
Class Schedule	CLASS 150/300/400/600/900/1500/2500;5K, 10K, 16K, 20K, 30K;PN6, PN10, PN16, PN25, PN40, PN64, PN100;2000PSI, 3000PSI, 5000PSI, 10000PSI, 15000PSI, 20000PSI
Production Standard	ASME B16.5/ASME B16.47A/ASME B16.47B/JIS B2220/KS B1503/DIN 2573/DIN 2527/DIN 2631/BS 4504/API 6A

ASTM A105 is a popular carbon steel material for a wide range of applications. It is inexpensive, readily available in numerous grades, and can be heat-treated to improve its strength, ductility, and machinability.

Carbon steel ASTM A105 flange are made up of carbon steel or mild steel material. The material composition can have carbon, manganese, phosphorus, sulfur and iron in the composition. Flanges are a type of connections for pipe lines to connect the pipes together. There are different types of flanges such as the weld neck flange, blind flange, slip on flange, socket weld flange,threaded flange ,and orifice flange.

Carbon Steel Flange Standard

ASME B16.5

ASME B16.47A/B

JIS B2220

DIN 2573

DIN 2527

DIN 2631

EN1092-1

API 6A

Pressure Rating for Forged Steel Flange

ASME FLANGES

Class 150, 300, 600, 900, 1500, 2500

JIS FLANGES

5K, 10K, 16K, 20K, 30K

EN FLANGES

PN6, PN10, PN16, PN25, PN40, PN64, PN100

API FLANGES

2000PSI, 3000PSI, 5000PSI, 10000PSI, 15000PSI, 20000PSI

ASTM A105 Material Properties

Chemical Properties

ASTM A105 is a forged carbon steel commonly used to manufacture ASTM A105 flange, as well as fittings and valves for high-pressure and elevated-temperature piping systems. Its chemical composition includes a maximum of 0.35% carbon, 0.60–1.05% manganese, and 0.10–0.35% silicon. Phosphorus and sulfur are strictly limited, below 0.035% and 0.040%, to ensure toughness and reduce the risk of brittleness. Small amounts of nickel, chromium, or molybdenum may be present to enhance strength and corrosion resistance.

CHEMICAL	LIMITS	C	Mn	P	S	Si	Cu	Ni	Cr	Mo	V
ASTM A105	MIN		0.60			0.10
ASTM A105	MAX	0.35	1.05	0.035	0.040	0.35	0.40	0.40	0.30	0.12	0.08

Mechanical Properties

ASTM A105 flange exhibit a minimum tensile strength of 485 MPa and a yield strength of 250 MPa, with an elongation rate of at least 22%. After proper heat treatment—such as normalizing or tempering—the material achieves stable mechanical performance with good impact resistance. These properties make ASTM A105 flanges suitable for a wide range of industrial piping systems, ensuring reliability under high stress and fluctuating temperature conditions.

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %
ASTM A105	485 min	250 min	22 min	30 min

Dimension of ASTM A105 Flange

ASME B16.5 is the production standard for American standard flanges. Defined flange dimensions ranges are availbale in 1/2”to 24”nominal sizes and in pressure of Class 150#, 300#, 600#, 900#, 1500#, and 2500# . There are many seal facing as Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) , Tongue-and-Groove (T&G) and Male-and-Female (M&F).

ASME B16.5 Class 300 Blind Flange Dimension:

Norminal Pipe Size		A	C	G	H	I	J
inch	mm	mm	mm	mm	Holes	mm	mm
1/2	21.3	88.9	11.2	35. 10	4	15.7	60.45
3/4	26.7	98.6	12.7	42.9	4	15.7	69.85
1	33.4	108	14.2	50.8	4	15.7	79.25
11/4	42.2	117.3	15.7	63.5	4	15.7	88.9
11/2	48.3	127	17.5	73. 15	4	15.7	98.6
2	60.3	152.4	19. 10	91.9	4	19.1	120.7
21/2	73.0	177.8	22.4	104.6	4	19.1	139.7
3	88.9	190.5	23.9	127	4	19.1	152.4
31/2	101.6	215.9	23.9	139.7	8	19.1	177.8
4	114.3	228.6	23.9	157.2	8	19.1	190.5
5	141.3	254	23.9	185.7	8	22.4	215.9
6	168.3	279.4	25.4	215.9	8	22.4	241.3
8	219.1	342.9	28.4	269.7	8	22.4	298.5
10	273.0	406.4	30.2	323.9	12	25.4	362
12	323.8	482.6	31.75	381	12	25.4	431.8
14	355.6	533.4	35. 10	412.8	12	28.4	476.3
16	406.4	596.9	36.6	469.9	16	28.4	539.8
18	457.2	635	39.6	533.4	16	31.75	577.9
20	508.0	698.5	42.9	584.2	20	31.75	635
24	609.6	812.8	47.8	692.2	20	35.1	749.3

If you wish to learn about other dimension of blind flanges, you can click the link below.

ASME B16.5 Class 150 Blind Flange Dimension

ASME B16.5 Class 400 Blind Flange Dimension

ASME B16.5 Class 600 Blind Flange Dimension

ASME B16.5 Class 900 Blind Flange Dimension

ASME B16.5 Class 1500 Blind Flange Dimension

ASME B16.5 Class 2500 Blind Flange Dimension

ASME B16.5 Class 300 Weld Neck Flange Dimension:

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm
1/2	21.30	95.20	15.70	14.20	52.30	21.30	38.10	35.00	4	15.70	66.55
3/4	26.70	117.3	20.80	15.70	57.15	26.70	47.70	42.90	4	19.00	82.50
1	33.40	123.9	26.70	17.50	62.00	33.50	53.80	50.80	4	19.00	88.90
1 1/4	42.20	133.3	35.10	19.00	65.00	42.20	63.50	63.50	4	19.00	98.50
1 1/2	48.30	155.4	40.90	20.60	68.30	48.30	69.85	73. 15	4	22.30	114.3
2	60.30	165. 1	52.60	22.30	69.85	60.45	84.00	91.90	8	19.00	127.0
2 1/2	73.00	190.5	62.70	25.40	76.20	73.15	100.0	104.6	8	22.30	149.3
3	88.90	209.5	78.00	28.40	79.25	88.90	117.3	127.0	8	22.30	168.1
3 1/2	101.6	228.6	90.20	30.20	81.00	101.6	133.3	139.7	8	22.30	184.1
4	114.3	254.0	102.4	31.70	85.80	114.3	146.0	157.2	8	22.30	200.1
5	141.3	279.4	128.3	35.00	98.50	141.2	177.8	185.7	8	22.30	234.9
6	168.3	317.5	154.2	36.50	98.50	168.4	206.2	215.9	12	22.30	269.7
8	219.1	381.0	202.7	41.10	111.2	219.2	260.3	269.7	12	25.40	330.2
10	273.0	444.5	254.5	47.70	117.3	273.0	320.5	323.8	16	28.40	387.3
12	323.8	520.7	304.8	50.80	130.0	323.8	374.6	381.0	16	31.70	450.8
14	355.6	584.2	To be specified by the Purchaser	53.80	142.7	355.6	425.4	412.7	20	31.70	514.3
16	406.4	647.7		57.15	146.0	406.4	482.6	469.9	20	35.00	571.5
18	457.2	711.2		60.45	158.7	457.2	533.4	533.4	24	35.00	628.6
20	508.0	774.7		63.50	162.0	508.0	587.2	584.2	24	35.00	685.8
24	609.6	914.4		69.85	168.1	609.6	701.5	692.1	24	41.10	812.8

If you wish to learn about other dimension of weld neck flanges, you can click the link below.

ASME B16.5 Class 150 Weld Neck Flange Dimension

ASME B16.5 Class 400 Weld Neck Flange Dimension

ASME B16.5 Class 600 Weld Neck Flange Dimension

ASME B16.5 Class 900 Weld Neck Flange Dimension

ASME B16.5 Class 1500 Weld Neck Flange Dimension

ASME B16.5 Class 2500 Weld Neck Flange Dimension

ASME B16.5 Class 300 Slip On Flange Dimension:

Nominal Pipe Size		A	B	C	D	F	G	H	I	J
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm
1/2	21.3	95.2	22.4	14.2	22.4	38.1	35.1	4	15.7	66.55
3/4	26.7		27.7	15.7	25.4	47.7	42.9	4	19.1	82.5
1	33.4	123.9	34.5	17.5	26.9	53.8	50.8	4	19.1	88.9
11/4	42.2	133.3	43.2	19	26.9	63.5	63.5	4	19.1	98.6
11/2	48.3	155.4	49.5	20.6	30.2	69.85	73.15	4	22.4	114.3
2	60.3	165.1	62	22.3	33.2	84	91.9	8	19.1	127
21/2	73	190.5	74.7	25.4	38.1	100	104.6	8	22.4	149.4
3	88.9	209.5	90.7	28.4	42.9	117.3	127	8	22.4	168.1
31/2	101.6	228.6	103.4	30.2	44.4	133.3	139.7	8	22.4	184.2
4	114.3	254	116.1	31.7	47.7	146	157.2	8	22.4	200.1
5	141.3	279.4	143.8	35	50.8	177.8	185.7	8	22.4	234.9
6	168.3	317.5	170.7	36.5	52.3	206.2	215.9	12	22.4	269.7
8	219. 1	381	221.5	41.1	61.9	260.3	269.7	12	25.4	330.2
10	273	444.5	276.3	47.7	66.55	320.5	323.9	16	28.4	387.3
12	323.8	520.7	327.1	50.8	73.15	374.6	381	16	31.7	450.8
14	355.6	584.2	359.1	53.8	76.2	425.4	412.8	20	31.7	514.4
16	406.4	647.7	410.5	57.15	82.5	482.6	469.9	20	35	571.5
18	457.2	711.2	461.8	60.45	88.9	533.4	533.4	24	35	628.7
20	508	774.7	513.1	63.5	95.2	587.2	584.2	24	35	685.8
24	609.6	914.4	616	69.85	106.4	701.5	692.2	24	41	812.8

If you wish to learn about other dimension of slip on flanges, you can click the link below.

ASME B16.5 Class 150 Slip On Flange Dimension

ASME B16.5 Class 400 Slip On Flange Dimension

ASME B16.5 Class 600 Slip On Flange Dimension

ASME B16.5 Class 900 Slip On Flange Dimension

ASME B16.5 Class 1500 Slip On Flange Dimension

ASME B16.5 Class 300 Threaded Flange Dimension:

Nominal Pipe Size		A	B	C	D	E	F	G	H	I	J
inch	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm
1/2	21.30	95.20	23.60	14.20	22.30	15.70	38.10	35.00	4	15.70	66.55
3/4	26.70	117.3	29.00	15.70	25.40	15.70	47.70	42.90	4	19.00	82.50
1	33.40	123.9	35.80	17.50	26.90	17.50	53.80	50.80	4	19.00	88.90
11/4	42.20	133.3	44.40	19.00	26.90	20.60	63.50	63.50	4	19.00	98.50
11/2	48.30	155.4	50.50	20.60	30.20	22.30	69.85	73. 15	4	22.30	114.3
2	60.30	165.1	63.50	22.30	33.20	28.40	84.00	91.90	8	19.00	127.0
21/2	73.00	190.5	76.20	25.40	38. 10	31.70	100.0	104.6	8	22.30	149.3
3	88.90	209.5	92.20	28.40	42.90	31.70	117.3	127.0	8	22.30	168.1
31/2	101.6	228.6	104.9	30.20	44.40	36.50	133.3	139.7	8	22.30	184.1
4	114.3	254.0	117.6	31.70	47.70	36.50	146.0	157.2	8	22.30	200.1
5	141.3	279.4	144.5	35.00	50.80	42.90	177.8	185.7	8	22.30	234.9
6	168.3	317.5	171.4	36.50	52.30	45.90	206.2	215.9	12	22.30	269.7
8	219.1	381.0	222.2	41.10	61.90	50.80	260.3	269.7	12	25.40	330.2
10	273.0	444.5	276.3	47.70	66.55	55.60	320.5	323.9	16	28.40	387.3
12	323.8	520.7	328.7	50.80	73. 15	60.45	374.6	381.0	16	31.70	450.8
14	355.6	584.2	360.4	53.80	76.20	63.50	425.4	412.7	20	31.70	514.3
16	406.4	647.7	411.2	57.15	82.50	68.30	482.6	469.9	20	35.00	571.5
18	457.2	711.2	462.0	60.45	88.90	69.85	533.4	533.4	24	35.00	628.6
20	508.0	774.7	512.8	63.50	95.20	73.15	587.2	584.2	24	35.00	685.8
24	609.6	914.4	614.4	69.85	106.4	82.50	701.5	692.2	24	41.10	812.8

If you wish to learn about other dimension of threaded flanges, you can click the link below.

ASME B16.5 Class 150 Threaded Flange Dimension

ASME B16.5 Class 400 Threaded Flange Dimension

ASME B16.5 Class 600 Threaded Flange Dimension

ASME B16.5 Class 900 Threaded Flange Dimension

ASME B16.5 Class 1500 Threaded Flange Dimension

ASME B16.5 Class 2500 Threaded Flange Dimension

ASME B16.5 Class 300 Socket Weld Flange Dimension:

Nominal Pipe Size		A	B	C	D	E	K	F	G	H	I	J
inch	mm	mm	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm
1/2	21.30	95.20	15.70	14.20	22.30	22.40	9.60	38.10	35.10	4	15.70	66.55
3/4	26.70	117.3	20.80	15.70	25.40	27.70	11.10	47.70	42.90	4	19.10	82.50
1	33.40	123.9	26.70	17.50	26.90	34.50	12.70	53.80	50.80	4	19.10	88.90
11/4	42.20	133.3	35.10	19.00	26.90	43.20	14.20	63.50	63.50	4	19.10	98.60
11/2	48.30	155.4	40.90	20.60	30.20	49.50	15.70	69.85	73.15	4	22.30	114.3
2	60.30	165.1	52.60	22.30	33.20	62.00	17.50	84.00	91.90	8	19.10	127.0
21/2	73.00	190.5	62.70	25.40	38.10	74.70	19.00	100.0	104.6	8	22.30	149.3
3	88.90	209.5	78.00	28.40	42.90	90.70	20.60	117.3	127.0	8	22.30	168. 1

If you wish to learn about other dimension of socket weld flanges, you can click the link below.

ASME B16.5 Class 150 Socket Weld Flange Dimension

ASME B16.5 Class 600 Socket Weld Flange Dimension

ASME B16.5 Class 1500 Socket Weld Flange Dimension

ASME B16.5 Class 300 Lap Joint Flange Dimension：

Nominal Pipe Size		A	B	C	D	R	F	H	I	J
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm
1/2	21.30	95.20	22.90	14.20	22.30	3.000	38.10	4	15.70	66.55
3/4	26.70	117.3	28.20	15.70	25.40	3.000	47.70	4	19.00	82.50
1	33.40	123.9	35.10	17.50	26.90	3.000	53.80	4	19.0	88.90
11/4	42.20	133.3	43.70	19.00	26.90	4.800	63.50	4	19.00	98.50
11/2	48.30	155.4	50.00	20.60	30.20	6.400	69.85	4	22.30	114.3
2	60.30	165.1	62.50	22.30	33.20	7.900	84.00	8	19.10	127.0
21/2	73.00	190.5	75.40	25.40	38.10	7.900	100.0	8	22.3	149.3
3	88.90	209.5	91.40	28.40	42.90	9.700	117.3	8	22.30	168.1
31/2	101.6	228.6	104.1	30.20	44.40	9.700	133.3	8	22.30	184.1
4	114.3	254.0	116.8	31.70	47.70	11.20	146.0	8	22.30	200.1
5	141.3	279.4	114.5	35.0	50.80	11.20	177.8	8	22.30	234.9
6	168.3	317.5	171.5	36.50	52.30	12.70	206.2	12	22.30	269.7
8	219.1	381.0	222.3	41. 10	61.90	12.70	260.3	12	25.40	330.2
10	273.0	444.5	277.4	47.70	95.20	12.70	320.5	16	28.40	387.3
12	323.8	520.7	328.2	50.80	101.6	12.70	374.6	16	31.70	450.8
14	355.6	584.2	360.2	53.80	111.2	12.70	425.4	20	31.70	514.3
16	406.4	647.7	411.2	57. 15	120.6	12.70	482.6	20	35.00	571.5
18	457.2	711.2	462.3	60.45	130.0	12.70	533.4	24	35.00	628.6
20	508.0	774.7	514.4	63.50	139.7	12.70	587.2	24	35.0	685.8
24	609.6	914.4	616.0	69.8	152.4	12.70	701.5	24	41.10	812.8