ASTM A105 Slip On Flange

In the field of complex industrial piping systems, ASTM A105 slip on flange is the basic core components known for their reliability, durability and versatility. Manufactured in strict accordance with ASTM A105 standards, these flanges are primarily made from high-quality carbon steel forgings, providing the perfect balance of strength, cost-effectiveness and ease of installation.It is widely used in petroleum, chemical, electric power, construction and many other industries, and bears the important responsibility of ensuring the safe and stable operation of pipeline system.

What Is a Slip On Flange?

Slip on flange (referred to as SO Flange) is commonly used in industrial piping system connection components, its essential features for the flange bore diameter is slightly larger than the outer diameter of the pipeline, the pipe inserted into the flange through the fillet weld.The pipe is inserted into the flange and connected to the flange by fillet welding. The core advantage of this design is that it allows a certain degree of axial sliding and self-alignment between the pipe and the flange during installation, which reduces the difficulty of alignment, and at the same time creates a hermetically sealed connection through welding.

Specification of ASTM A105 Slip On Flange：

Sealing Face	RF, FF, FTJ
Size Range	1/2″ – 24″ / DN15 – DN600
Pressure Rating	Class 150, 300, 600, 900, 1500, 2500lb
Standard	ANSI / ASME B16.5, EN1092-1

ASTM A105 Material Analysis:

Chemical Composition：

The chemical composition of ASTM A105 is crucial to its performance, and a reasonable elemental ratio not only ensures that the material has good strength, toughness and compression resistance, but also ensures its stability and safety in high temperature and high pressure environments.

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

Mechanical Properties：

Mechanical properties is a measure of stainless steel pipe can play a stable role in the core indicators, related to industrial equipment safety and engineering life.

MATERIAL	T.S (MPA)	Y.S (MPA)	EL %	R/A %	HARDNESS
ASTM A105	485 min	250 min	22 min	30 min	197 max

Dimension of Slip On Flange:

ZIZI specializes in the production and supply of various types of carbon steel slip on flanges, which cover pressure values including 150#, 300#, 400#, 600#, 900#, 1500# and so on.

150# slip on flange :

Nominal Pipe Size		A	B	C	D	F	G	H	I	J	Weight
inch	mm	mm	mm	mm	mm	mm	mm	Holes	mm	mm	kg / piece
1/2	21.3	88.9	22.4	11.2	15.7	30.2	35.1	4	15.7	60.45	0.39
3/4	26.7	98.6	27.7	12.7	15.7	38. 10	42.9	4	15.7	69.85	0.56
1	33.4	108	34.5	14.2	17.5	49.3	50.8	4	15.7	79.25	0.78
11/4	42.2	117.3	43.2	15.7	20.6	58.7	63.5	4	15.7	88.9	1.03
11/2	48.3	127	49.5	17.5	22.4	65	73.15	4	15.7	98.6	1.32
2	60.3	152.4	62	19.1	25.4	77.7	91.9	4	19.1	120.7	2.06
21/2	73	177.8	74.7	22.4	28.4	90.4	104.6	4	19.1	139.7	3.28
3	88.9	190.5	90.7	23.9	30.2	108	127	4	19.1	152.4	3.85
31/2	101.6	215.9	103.4	23.9	31.75	122.2	139.7	8	19.1	177.8	4.81
4	114.3	228.6	116.1	23.9	33.3	134.9	157.2	8	19.1	190.5	5.30
5	141.3	254	143.8	23.9	36.6	163.6	185.7	8	22.4	215.9	6.07
6	168.3	279.4	170.7	25.4	39.6	192	215.9	8	22.4	241.3	7.45
8	219.1	342.9	221.5	28.4	44.5	246.1	269.7	8	22.4	298.5	12.1
10	273	406.4	276.3	30.2	49.3	304.8	323.9	12	25.4	362	16.5
12	323.8	482.6	327.1	31.75	55.6	365.3	381	12	25.4	431.8	26.2
14	355.6	533.4	359.1	35.1	57.15	400.1	412.8	12	28.4	476.3	34.6
16	406.4	596.9	410.5	36.6	63.5	457.2	469.9	16	28.4	539.8	44.8
18	457.2	635	461.8	39.6	68.3	505	533.4	16	31.75	577.9	48.9
20	508	698.5	513.1	42.9	73.15	558.8	584.2	20	31.75	635	61.9
24	609.6	812.8	616	47.8	82.6	663.4	692.2	20	35.1	749.3	86.9

Weight of Slip On Flange:

The weight units in the table below are “KG”.

NPS	150LB	300LB	400LB	600LB	900LB	1500LB	2500LB
1/2	0.45	0.68	0.91	0.91	2.72	2.72	3.18
3/4	0.68	1.14	1.36	1.36	2.72	2.72	4.09
1	0.91	1.36	1.59	1.59	3.41	3.41	5.45
1 1/4	1.14	2.04	2.04	2.04	4.54	4.54	8.17
1 1/2	1.36	2.95	2.95	2.95	6.36	6.36	11.35
2	2.18	3.18	3.63	3.63	9.99	9.99	17.25
2 1/2	3.45	4.54	5.45	5.45	14.07	16.34	24.97
3	4.01	5.90	6.81	6.81	16.34	21.79	37.68
3 1/2	4.99	7.20	9.53	9.53	–	–	–
4	5.63	10.67	10.90	14.98	24.06	33.14	57.66
5	6.74	13.17	14.07	28.60	37.68	59.93	95.34
6	7.90	16.34	17.71	36.32	49.03	74.46	146.64
8	12.90	25.42	28.60	44.04	78.09	117.13	220.19
10	17.60	34.96	41.31	80.36	111.23	197.94	419.95
12	27.69	51.30	58.57	97.61	148.00	302.82	590.20
14	37.68	72.19	86.71	117.59	172.52	–	–
16	48.12	95.34	114.86	166.16	208.39	–	–
18	49.49	114.86	140.74	216.10	293.74	–	–
20	67.19	139.38	171.61	277.85	359.57	–	–
24	92.62	222.46	244.71	397.70	671.92	–	–

Inspection:

Outer Diameter

The outer diameter of a flat welding flange is the outermost diameter dimension of the flange. Accurate OD dimensions ensure that the flange can be properly aligned and fit with adjacent components (e.g., another flange, pipe fittings, etc.) when installed in the pipeline.

Inner Diameter

The inner diameter of the flange is the diameter of the hole in the center of the flange, which should be matched with the outer diameter of the connected pipe to ensure that the pipe can be inserted into the inner hole of the flange smoothly, and to ensure the smooth flow of medium in the pipeline.

Thickness

The thickness of a flange is directly related to its load-bearing capacity and strength. Sufficient thickness ensures that the flanges will not be deformed or ruptured when subjected to internal pressure, external loads and temperature changes.

The diameter of the center circle of the bolt hole:

This dimension determines the positional accuracy of the flange when bolted to the paired flanges.

Areas of Application：

Oil and gas industry: Upstream exploration and extraction,Midstream and downstream refining, storage and transportation.

Chemical and Pharmaceutical Industry: Chemical process piping, pharmaceutical clean piping.

Heating and Drainage Systems：Centralized heat supply network, water supply and drainage works.

Power Industry：Thermal power systems, auxiliary systems for nuclear power plants.

Marine and Offshore：Marine piping systems, offshore platforms.

Metallurgy and Machinery Manufacturing:Metallurgical rolling equipment, general machinery.

24 9 月, 2025