On April 11, 2025, an old customer from China sent us an inquiry for ASTM A105 Threaded Fittings, which are made of common carbon steel. After receiving the quotation, the customer spoke highly of our professional service and confirmed the order on April 30, 2025. This cooperation further consolidated our long-term cooperative relationship with this old customer and laid a solid foundation for cooperation on more subsequent projects.

ZIZI is a professional manufacturer and processor of pipes and fittings, dedicated to providing high-quality products for core sectors such as chemical, petroleum, natural gas, water conservancy, electric power, and marine engineering. We offer a comprehensive range of pipes and fittings, including seamless pipes, welded pipes, butt-weld fittings, high-pressure forged fittings, and flanges. Crucially, we also possess strong capabilities in producing machined parts, allowing us to customize products to meet specific client requirements. Our materials expertise covers a wide array, including carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, and nickel-based alloys, ensuring we can satisfy demanding application needs across various harsh operating conditions.

Purchase List

Since this order contains many products, only a partial list is shown.

DESCRIPTION	MATERIAL	PRESSURE	END	QUANTITY	UNIT	Remark
ELBOW 90°DN65 SCH80 CS	ASTM A105	3000#	RC Thread	6	PCS	Hot dip galvanizing
ELBOW 90°DN50 SCH80 CS	ASTM A105	3000#	RC Thread	36	PCS	Hot dip galvanizing
ELBOW 90°DN40 SCH80 CS	ASTM A105	3000#	RC Thread	10	PCS	Hot dip galvanizing
ELBOW 90°DN32 SCH80 CS	ASTM A105	3000#	RC Thread	120	PCS	Hot dip galvanizing
ELBOW 90°DN25 SCH80 CS	ASTM A105	3000#	RC Thread	65	PCS	Hot dip galvanizing
TEE DN32 SCH80 CS	ASTM A105	3000#	RC Thread	28	PCS	Hot dip galvanizing
TEE DN25 SCH80 CS	ASTM A105	3000#	RC Thread	15	PCS	Hot dip galvanizing
TEE DN20 SCH80 CS	ASTM A105	3000#	RC Thread	5	PCS	Hot dip galvanizing
TEE DN15 SCH80 CS	ASTM A105	3000#	RC Thread	5	PCS	Hot dip galvanizing
HEX NIPPLE DN50x32 SCH80 CS	ASTM A105	3000#	RC Thread	14	PCS	Hot dip galvanizing
HEX NIPPLE DN40x32 SCH80 CS	ASTM A105	3000#	RC Thread	7	PCS	Hot dip galvanizing
HEX NIPPLE DN32x25 SCH80 CS	ASTM A105	3000#	RC Thread	7	PCS	Hot dip galvanizing
CAP DN32 SCH80 CS	ASTM A105	3000#	RC Thread	25	PCS	Hot dip galvanizing

Inspection of Threaded Fittings

Surface defects: Check whether there are cracks, sand holes, shrinkage holes, slag inclusions, delamination, heavy skin, depressions, rust and other defects on the surface of the pipe fittings. These defects will affect the strength and sealing of the pipe fittings.

Dimension inspection: Use calipers, vernier calipers, tape measures and other tools to check whether the nominal diameter, wall thickness, length, end face, etc. of the pipe fittings meet the requirements of the design drawings or relevant standards (such as ASME B16.11).

Thread quality: Check whether the thread profile is complete and clear, and whether there are missing teeth, irregular teeth, burrs, knife marks and other phenomena.

Marking inspection: Check whether the manufacturer’s logo, material brand, furnace batch number, size, pressure level and other markings on the pipe fittings are clear, accurate and complete, and consistent with relevant certificates and documents.

What is Hot-Dip Galvanizing?

Hot-dip galvanizing, is a very common and effective method of preventing corrosion on steel. Its basic principle is to dip cleaned steel products into a molten zinc solution, and through the metallurgical reaction between zinc and iron, a dense layer of zinc alloy and pure zinc is formed on the surface of the steel, thus providing protection.

Threaded Fittings Specification

Size:	1/4″ to 4″ ( DN6 to DN100)
Pressure Rating:	Class 2000, 3000, 6000 LBS
Standard:	ASME B16.11, BS3799, MSS SP-79 / 83 / 85 / 97
Type:	Threaded Elbow, Tee, Cross, Cap, Coupling, Boss, Plug, Bushing and Union.
Material:	ASTM A105, A350 LF2/LF3, A182 F5, F9, F11, F12, F22, F91, F304/304L, F316/316L, F317, F310S, F321, F347, F904.

ASTM A105 Threaded Fittings 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

ASTM A105 Threaded Fittings Mechanical Property

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

Common Types of Threaded Fittings

Elbows (90° and 45°) – Used to change pipe direction.

Tees – Allow branching of the pipeline.

Couplings – Connect two pipes together.

Unions – Provide easy disconnection for maintenance.

Bushings – Reduce pipe size.

Nipples – Short sections of threaded pipe.

Caps & Plugs – Seal pipe ends.

Crosses – Four-way connection.

Carbon Steel Threaded Fittings Dimensions+

Elbow & Tee & Cross Dimension

Threaded 45 Elbow			Threaded 45 ° Elbow				Threaded Tee					Threaded Cross
Nominal  Size		Center-to-End						Outside Diameter of Band			Wall Thickness			Length of Thread
DN	NPS	A						H			G min			L5 min	L2 min
		90°   Elbows, Tees, Crosses			45 °  Elbows
		2000	3000	6000	2000	3000	6000	2000	3000	6000	2000	3000	6000
6	1/8 1/4 3/8	21	21	25	17	17	19	22	22	25	3.18	3.18	6.35	6.4	6.7
8	1/4	21	25	28	17	19	22	22	25	33	3.18	3.30	6.60	8.1	10.2
10	3/8	25	28	33	19	22	25	25	33	38	3.18	3.51	6.98	9.1	10.4
15	1/2	28	33	38	22	25	28	33	38	46	3.18	4.09	8.15	10.9	13.6
20	3/4	33	38	44	25	28	33	38	46	56	3.18	4.32	8.53	12.7	13.9
25	1	38	44	51	28	33	35	46	56	62	3.68	4.98	9.93	14.7	17.3
32	1 1/4	44	51	60	33	35	43	56	62	75	3.89	5.28	10.59	17.0	18.0
40	1 1/2	51	60	64	35	43	44	62	75	84	4.01	5.56	11.07	17.8	18.4
50	2	60	64	53	43	44	52	75	84	102	4.27	7.14	12.09	19.0	19.2
65	2 1/2	76	83	95	52	52	64	92	102	121	5.61	7.65	15.29	23.6	28.9
80	3	86	95	106	64	64	79	109	121	146	5.99	8.84	16.64	25.9	30.5
100	4	106	114	114	79	79	79	146	152	152	6.55	11.18	18.67	27.7	33

Coupling & Boss & Cap Dimension

Coupling			Half-Coupling		Boss			Cap
Nominal  Size		End-to-End	End-to-End		Outside Diameter		End Wall		Length of Thread
DN	NPS	W	P		D		G min		L5 min	L2 min
		3000  &  6000	3000	6000	3000	6000	3000	6000
6	1/8	32	19		16	22	4.8		6.4	6.7
8	1/4	35	25	27	19	25	4.8	6.4	8.1	10.2
10	3/8	38	25	27	22	32	4.8	6.4	9.1	10.4
15	1/2	48	32	33	28	38	6.4	7.9	10.9	13.6
20	3/4	51	37	38	35	44	6.4	7.9	12.7	13.9
25	1	60	41	43	44	57	9.7	11.2	14.7	17.3
32	1 1/4	67	44	46	57	64	9.7	11.2	17.0	18.0
40	1 1/2	79	44	48	64	76	11.2	12.7	17.8	18.4
50	2	86	48	51	76	92	12.7	15.7	19.0	19.2
65	2 1/2	92	60	64	92	108	15.7	19.0	23.6	28.9
80	3	108	65	68	108	127	19.0	22.4	25.9	30.5
100	4	121	68	75	140	159	22.4	28.4	27.7	33.0

Application of Carbon Steel Threaded Pipe Fittings

Low-pressure and medium-low-pressure piping systems: They are often used in systems with relatively less stringent pressure and temperature requirements.

Water treatment and water supply and drainage systems: Common water supply, drainage and fire protection pipelines.

Gas pipelines: They are also used in some low-pressure gas transmission pipelines.

Light industry and civil construction: Suitable for general industrial fluid transportation, heating, ventilation and air conditioning (HVAC) systems and residential pipelines.

Systems that require frequent disassembly and maintenance: The characteristics of threaded connections make it easy to disassemble and replace, which is convenient for maintenance.