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What is MSS SP-83 Specification

ZIZI ENGEERING CO LTD is professional and experience in servicing and producing all types of pipe fittings. MSS SP-83 Union is one of the main products of ZIZI ENGERING CO LTD.

MSS SP 83 is the specification for socket weld and threaded union which cover size tolerance, marking, material etc.

MSS SP-83 union is an active pipe connection fitting with the feature of easy for assemble and disassemble. It can be widely used in different diameters pipeline connection, and the connection of meter and valve with pipe line. Generally, a complete union shall consist of three parts: male end, female end, and nut. The two ends connect two pipes and the nut connects the two ends like a coupling. It is forged with round steel or ingot and then lathed into shape. It connects pipes by threads and includes internal thread type and external thread type.

We Can Supplied MSS SP-83 Union scope

Size	1/8″ to 3″ ( DN6 to DN80)
Pressure Rating	Class 3000
Standard	MSS SP-83
Type	Socket Weld Union and Threaded Union
Carbon Steel	ASTM A105 / A105N, ASTM A350 LF2/LF3, A694 F42 / 46 / 56 / 60 / 65
Alloy Steel	ASTM A182 F11 / F12 / F5 / F9 / F91 / F92 / F22
Stainless Steel	ASTM A182 F304/304L/304H, F316/316L, F310S, F317, F347, F904L/F51/F55

ASTM A105 Carbon Steel Union

ASTM A105 union is forged fittings made of carbon steel material, generally produced according to the MSS SP-83 standard. ASTM A105 Union is widely used in various pipeline systems due to their superior performance and low cost.

Chemical Composition

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

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

ASTM A105 Union have been widely used in pipeline systems due to their high strength, excellent sealing performance. MSS SP-83 Union can providing important guarantees for the safe and stable operation of pipeline systems.

ASTM A182 MSS SP-83 Union

ASTM A182 forged pipe fittings refer to pipe fittings forged from alloy, stainless steel, or duplex steel materials. These material typically have excellent corrosion resistance, good mechanical properties to ensure the safe, and operation of pipeline.

Alloy Steel Material Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo
ASTM A182 F5	MIN		0.30					4.00	0.44
	MAX	0.15	0.60	0.030	0.030	0.50	0.50	6.00	0.65
ASTM A182 F9	MIN		0.30			0.50		8.00	0.90
	MAX	0.15	0.60	0.030	0.030	1.00		10.00	1.10

Alloy Steel Material Mechanical Properties

MATERIAL	ASTM A182 F5	ASTM A182 F9
T.S (MPA)	485 min	585 min
Y.S (MPA)	275 min	380 min
EL %	20 min	20 min
R/A %	35 min	40 min
HARDNESS	143-217	179-217

Stainless Steel Material Chemical Composition

CHEMICAL	LIMITS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu
ASTM A182 F304	MIN						8.0	18.0
	MAX	0.08	2.00	0.045	0.030	1.00	11.0	20.0		0.10
ASTM A182 F316	MIN						10.0	16.0	2.00
	MAX	0.08	2.00	0.045	0.030	1.00	14.0	18.0	3.00	0.01
ASTM A182 F44	MIN						17.50	19.50	6.00		0.50
	MAX	0.02	1.00	0.030	0.010	0.80	18.50	20.50	6.50		1.00
ASTM A182 F51	MIN						4.50	21.00	2.50	0.08
	MAX	0.03	2.00	0.030	0.020	1.00	6.50	23.00	3.50	0.20

Stainless Steel Material Mechanical Properties

MATERIAL	ASTM A182 F304	ASTM A182 F316	ASTM A182 F44	ASTM A182 F51
T.S (MPA)	515 min	515 min	650 min	620 min
Y.S (MPA)	205 min	205 min	300 min	450 min
EL %	30 min	30 min	35 min	35 min
R/A %	50 min	50 min	50 min	45 min

MSS SP-83 Union should be paid to their quality and performance to ensure the safety, and efficiency of fluid transportation.

MSS SP-83 Union Dimension and Weight

Class 3000 Threaded Union Dimension

Nominal Size		Pipe End	Wall	Bone	Male Flange	Nut	THRD Per Inch	Bearing	Length Assem	Clear Assem Nut
DN	NPS	A min	C min	D	F min	G min	H	J min	L nom	N
6	1/8	14.7	2.4	8.4	3.2	3.2	16	1.2	41.4	51
				6.4
8	1/4	19.1	3	11.1	3.2	3.2	16	1.2	41.4	51
				9.4
10	3/8	22.9	3.2	14.3	3.4	3.4	14	1.4	46	56
				13.5
15	3/4	27.7	3.7	17.9	3.7	3.7	14	1.5	49	59
				17.1
20	1/2	33.5	3.9	23	4.1	4.1	11	1.7	56.9	66
				21.4
25	1	41.4	4.5	29	4.6	4.4	11	1.9	62	79
				27.7
32	1-1/4	50.5	4.9	37.7	5.3	5.2	10	2.1	71.1	94
				35.4
40	1-1/2	57.2	5.1	43.5	5.8	5.6	10	2.3	76.5	112
				41.2
50	2	70.1	5.5	55.6	6.6	6.4	10	2.7	86.1	132
				52.1
65	2-1/2	85.3	7	66.3	7.5	7.1	8	3.1	102.4	150
				64.3
80	3	102.4	7.6	82.6	8.3	8	8	3.5	109	176
				77.3

Class 3000 Socket Weld Union Dimension

DN	NPS	A	B	C	D	E	F	G	H	J	K	L	N
6	1/8	21.8	10.9	3.2	6.1	20.7	3.2	3.2	16	1.2	9.7	41.4	51
8	1/4	21.8	14.3	3.3	8.5	20.7	3.2	3.2	16	1.2	9.7	41.4	51
10	3/8	25.9	17.7	3.5	11.8	23.8	3.4	3.4	14	1.4	9.7	46	56
15	3/4	31.2	21.9	4.1	15	23.8	3.7	3.7	14	1.5	9.7	49	59
20	1/2	37.1	27.3	4.3	20.2	28.6	4.1	4.1	11	1.7	12.7	56.9	66
25	1	45.5	34	5	25.9	30.2	4.6	4.4	11	1.9	12.7	62	79
32	1-1/4	54.9	42.8	5.3	34.3	36.6	5.3	5.2	10	2.1	12.7	71.1	94
40	1-1/2	61.5	48.9	5.5	40.1	38.1	5.8	5.6	10	2.3	12.7	76.5	112
50	2	75.2	61.2	6	51.7	41.4	6.6	6.4	10	2.7	15.7	86.1	132
65	2-1/2	91.7	73.9	7.7	61.2	56.9	7.5	7.1	8	3.1	15.7	102.4	150
80	3	109.2	89.9	8.3	76.4	58.7	8.3	8	8	3.5	15.7	109	176

Weight List of MSS SP-83 Union

NOMINAL SZIE		WEIGHT
DN	NPS	3000
6	1/8	0.25
8	1/4	0.3
10	3/8	0.35
15	3/4	0.46
20	1/2	0.61
25	1	0.85
32	1-1/4	1.35
40	1-1/2	2.85
50	2	4
65	2-1/2	4.9
80	3	7.1

Why Choose Us for MSS SP-83 Union

ISO and CE certified quality

Short delivery

Safe package

Abundant stock

Reasonable price

One stop service

Full specification

4 6 月, 2024