On July 31, 2025, our domestic customer sent us an inquiry for ASTM A105 threaded pipe fittings, including threaded elbows, threaded tees, threaded pipe couplings, and threaded pipe caps.

ASTM A105 carbon steel, as the most common material for forged pipe fittings, has long been one of our company’s most familiar and common products.

ZIZI can offer a full range of A105 threaded fittings, covering pressure ratings such as Class 2000, 3000, and 6000. All products are manufactured in accordance with ASME B16.11 standards and undergo rigorous dimensional and pressure testing to ensure reliable application in industries such as oil, gas, chemicals, and power.

Our customers have long relied on us for our advantages in timely delivery, consistent quality, and customization capabilities. This inquiry once again demonstrates their trust in our brand.

Inspection of ASTM A105 Threaded Fittings

Visual and Dimensional Inspection

Inspect threaded elbows, tees, pipe clamps, pipe caps, etc., for cracks, pores, burrs, or deformation.

Thread precision is inspected using a thread gauge to ensure a tight and reliable connection with the corresponding pipe or fitting.

Dimensions are verified against ASME B16.11 standards, including outer diameter, inner diameter, wall thickness, thread depth, etc.

Material and Chemical Composition Testing

Spectral analysis or chemical analysis is used to confirm that material composition meets ASTM A105 standard requirements.

Particular attention is paid to the content of elements such as carbon, manganese, sulfur, and phosphorus to ensure that the material possesses the specified mechanical properties and pressure resistance.

Mechanical property testing

Tensile, impact, and hardness tests are conducted to ensure that the fittings have sufficient strength and toughness under pressure and low-temperature conditions.

Inspection Photos

Threaded Fitting Specification

Threaded Length:

The length of the threaded portion must comply with NPT standards for a tight, secure fit.

Nominal Pipe Size (NPS):

The NPS is used to designate the size of the forged threaded fittings. For example, a 1/2” fitting has a 1/2” NPS.

Wall Thickness:

The threaded elbows and threaded tees wall thickness must comply with the class designation (2000, 3000, or 6000) to handle the pressure rating associated with that class.

ASTM A105 Carbon Steel 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 A105N	MIN		0.600
	MAX	0.350	1.050	0.040	0.050		0.400		0.300	0.120	0.080

ASTM A105 Carbon Steel 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
ASTM A105N	485min	250 min	22 min	30 min	197 max

Threaded Elbow & Tee Dimension

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
		2000	3000	6000	2000	3000	6000	2000	3000	6000
6	1/8	21	21	25	22	22	25	3.18	3.18	6.35	6.4	6.7
8	1/4	21	25	28	22	25	33	3.18	3.30	6.60	8.1	10.2
10	3/8	25	28	33	25	33	38	3.18	3.51	6.98	9.1	10.4
15	1/2	28	33	38	33	38	46	3.18	4.09	8.15	10.9	13.6
20	3/4	33	38	44	38	46	56	3.18	4.32	8.53	12.7	13.9
25	1	38	44	51	46	56	62	3.68	4.98	9.93	14.7	17.3
32	1 1/4	44	51	60	56	62	75	3.89	5.28	10.59	17.0	18.0
40	1 1/2	51	60	64	62	75	84	4.01	5.56	11.07	17.8	18.4
50	2	60	64	53	75	84	102	4.27	7.14	12.09	19.0	19.2
65	2 1/2	76	83	95	92	102	121	5.61	7.65	15.29	23.6	28.9
80	3	86	95	106	109	121	146	5.99	8.84	16.64	25.9	30.5
100	4	106	114	114	146	152	152	6.55	11.18	18.67	27.7	33

Threaded Coupling & Cap Dimension

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

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.

Advantages of ASTM A105 Threaded Fittings

Easy and Quick Installation: No specialized welding equipment or technicians are required; installation can be completed using simple tools, significantly reducing construction time and labor costs.

Removable and Reusable: Threaded connections allow fittings to be easily disassembled when necessary, facilitating maintenance, inspection, or modification of the piping system, thereby enhancing system flexibility.

Reliable Sealing Performance: Through the tight fit of threads and the use of thread sealants or sealing tapes, reliable leak-proof sealing is achieved, making them suitable for medium to low-pressure fluid transportation.

Cost-effective: Compared to welded fittings that require complex welding processes and non-destructive testing, ASTM A105 threaded fittings typically offer a cost advantage.

Common Application Scenarios

Oil and Gas Transportation

Chemical and Petrochemical Industries

Power and Water Conservancy

Construction and Fire Protection