Casing Nipple Chart

Casing Nipple

The Casing Nipple Chart provides an overview of the accurate measurement of casing nipples for oil pipe and steel grade. Having knowledge about this topic is helpful, as it gives information on what type to use for different purposes. Typically, a casing nipple has threads on both ends that are made of a straight pipe. These are considered a prominent category of pipe fittings. Moreover, these fittings permit plumbing to be connected to a heater or other kinds of plumbing.

Casing Nipple Types

Most of the time, people confuse casing nipple for a pipe coupling or vice versa. To prevent further confusion, a pipe coupling is an outer joint and has a female thread on both ends. Casing nipples have male threads on each side.
Casing nipples have different types such as the following:

Weld Nipple

These are preferred for situations under extreme conditions of pressure surges, vibrations, and alterations in temperature.

Swage Nipple

Its fundamental function includes allowing the flow of fluid from connecting pipes. These are available with threaded ends, beveled, or plain.

Barrel Nipple

Its fundamental function includes allowing the flow of fluid from connecting pipes. These are available with threaded ends, beveled, or plain.

Casing Nipple Benefits

Opting for casing nipple offers a lot of advantages. These fittings make a pipe permanently leak-proof which increases the efficiency of the entire system. Also, there is a decrease in turbulence and pressure as the inner surface of the pipe is smooth. These fittings are known to use space more efficiently in contrast with other connecting procedures.

Casing Nipples Chart

wdt_ID	NPS	DN Size	NPS (wt)	DN Weight	Steel Grade
1	4-1/2	114	10.50	15.70	K
2			11.60	17.36	K-N-P
3	5	125	11.50	17.36	K
4			13.00	19.47	K
5			15.00	22.44	K-N-P
6			18.00	26.93	N-P
7	5-1/2	140	14.00	20.98	K
8			15.50	23.20	K
9			17.00	25.44	K-N-P
10			20.00	29.93	N-P
11	6-5/8	168	20.00	29.93	K
12			24.00	35.94	K-N-P
13			28.00	41.91	N-P
14	7	175	20.00	29.93	K
15			23.00	34.42	K-N
16			26.00	38.91	K-N-P
17			29.00	43.40	N-P
18	7-5/8	194	26.40	39.50	K-N
19			29.70	44.45	N-P
20	8-5/8	219	24.00	35.94	K
21			32.00	47.88	K
22			36.00	53.89	K-N-P
23			44.00	65.87	N-P
24			49.00	73.36	N-P
25	9-5/8	245	36.00	53.89	K
26			40.00	59.86	K-N
27			43.50	65.11	N-P
28			47.00	70.36	N-P
29	10-3/4	273	40.50	60.62	K
30			45.50	68.11	K
31			55.50	83.06	N-P
32	11-3/4	298	60.00	89.83	K
33	13-3/8	340	54.50	81.58	K
34			61.00	91.31	K
35			68.00	101.77	K
36			72.00	107.78	K
37	16	400	75.00	112.27	K
38			84.00	125.73	K

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Full Size Chart

Casing Nipples Chart

wdt_ID	NPS	DN Size	NPS (wt)	DN Weight	Steel Grade
1	4-1/2	114	10.50	15.70	K
2			11.60	17.36	K-N-P
3	5	125	11.50	17.36	K
4			13.00	19.47	K
5			15.00	22.44	K-N-P
6			18.00	26.93	N-P
7	5-1/2	140	14.00	20.98	K
8			15.50	23.20	K
9			17.00	25.44	K-N-P
10			20.00	29.93	N-P
11	6-5/8	168	20.00	29.93	K
12			24.00	35.94	K-N-P
13			28.00	41.91	N-P
14	7	175	20.00	29.93	K
15			23.00	34.42	K-N
16			26.00	38.91	K-N-P
17			29.00	43.40	N-P
18	7-5/8	194	26.40	39.50	K-N
19			29.70	44.45	N-P
20	8-5/8	219	24.00	35.94	K
21			32.00	47.88	K
22			36.00	53.89	K-N-P
23			44.00	65.87	N-P
24			49.00	73.36	N-P
25	9-5/8	245	36.00	53.89	K
26			40.00	59.86	K-N
27			43.50	65.11	N-P
28			47.00	70.36	N-P
29	10-3/4	273	40.50	60.62	K
30			45.50	68.11	K
31			55.50	83.06	N-P
32	11-3/4	298	60.00	89.83	K
33	13-3/8	340	54.50	81.58	K
34			61.00	91.31	K
35			68.00	101.77	K
36			72.00	107.78	K
37	16	400	75.00	112.27	K
38			84.00	125.73	K

Casing Nipple Abbreviations and Meaning

N.P.S. – Nominal Pipe Size
D.N. – Diameter Nominal

NPS

Nominal Pipe Size is an international standard from North America that designates the thickness and diameter of a pipe. It uses inches in measuring.

DN

Diameter Nominal is a European standard equivalent to NPS. It uses millimeters in measuring.

Steel Grade

It is a standard numbering system used to distinguish various types of steel that are based on their properties. The American Iron and Steel Institute and SAE made this system possible. At present, steel can be categorized into carbon or alloy with combinations such as iron, carbon, and other elements. An example of steel grade is Steel Grade K. This is also known as Type VI—an alloy steel formulated in forming wrought products. This type is known to have moderately high tensile strength compared to other alloy steels in the same category.

Sourcing Quality Casing Nipples for Wellhead and Surface Equipment

Selecting the appropriate casing nipple specifications ensures reliable connections between wellhead components, surface equipment, and casing strings while maintaining pressure integrity and compatibility with existing infrastructure. The charts above provide comprehensive dimensional and material specifications for standard casing nipples across various sizes and steel grades, enabling operators and equipment suppliers to match nipple specifications to specific pressure ratings, temperature conditions, and corrosive environments encountered in oilfield operations. Casing nipples serve critical functions in wellhead assemblies, Christmas tree installations, and surface flow systems where threaded connections must provide leak-proof seals under fluctuating pressures and thermal cycles. Understanding the relationship between nipple dimensions, thread specifications, steel grade properties, and connection requirements ensures proper fit-up with companion flanges, valves, and piping systems while meeting API 6A specifications for wellhead equipment and pressure-containing components.

Flowtech Energy maintains inventory of API-certified casing nipples in standard sizes and steel grades to support wellhead construction, equipment repairs, and surface facility installations for both domestic and international operations. Our procurement team sources nipples manufactured to API specifications with complete material certifications documenting chemical composition, mechanical properties, and pressure ratings required for regulatory compliance and operator standards. Whether you need standard carbon steel nipples for conventional applications, alloy steel nipples for high-pressure or sour service environments, or custom configurations including swage nipples for diameter transitions and weld nipples for permanent installations, we provide technical guidance to ensure proper material selection and dimensional compatibility. We understand that wellhead integrity depends on quality connections, and our quality control processes verify thread specifications, dimensional accuracy, and material traceability for all nipple inventory. If you need assistance selecting appropriate casing nipple specifications for your wellhead equipment, sourcing certified materials with complete documentation, or coordinating delivery for field installations and maintenance operations, contact Flowtech Energy at 1-877-645-6693. We deliver reliable supply chain support for wellhead components and surface equipment—ensuring your operations have the right materials to maintain pressure integrity and equipment performance throughout the life of your wells.

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