Stainless steel pipe nipple is a commonly used fittings in the pipeline connection, more welding or threaded form of connecting pipeline, through the threads and other pipeline or equipment connection, play a role in extending the pipeline, changing the direction of the pipeline or connecting the pipeline of different diameters, and other roles. Commonly used in low and medium pressure piping system. The material is stainless steel, with good corrosion resistance, high temperature resistance and strength.
Threaded nipples are mainly divided into one end threaded nipples and both end threaded nipples. One end of the external thread and the other end of the flat or beveled short section is called a single threaded section; both ends are external threaded section is called a double threaded section.
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ASTM A733 Threaded Pipe Nipple Specification
| Specification | Threaded Nipple |
| Size | 1/4” – 12” / DN8 – DN300 |
| Wall Thickness | Sch 10 – Sch 160 / XXS |
| Standard | ASTM A733 |
| End | PE, BE,THD |
| Thread Type | NPT, PT, BSPP, BSPT, PF |
| Stainless Steel | ASTM A312 TP304/304L/304H, 316/316L, 310S, 317,347,904L, |
| Duplex Stainless Steel | S32205, S31803, 32750, 32760, S32550 |
Classification of Threaded Nipples
One end threaded nipple
The single-ended threaded nipple is machined with a thread on one end only and a flat or socket on the other end, and is used for connecting pipes that require a threaded connection on one end. This construction allows it to be used for specific connection purposes in piping systems. For example, when a piece of equipment with a female connector needs to be connected to a pipeline, the unthreaded end of the single threaded nipple can be welded to the pipeline or connected in some other way, while the threaded end is threaded to the female connector of the equipment.
In the petrochemical industry, if there is a small process pipeline, there is a need for regular replacement of filter cartridges, the filter inlet and outlet for the female threaded interface. In this case, a single threaded nipple can be used to connect the filter to the pipeline. The unthreaded end of the single-threaded nipple is welded to the pipe to ensure a solid connection, while the threaded end is connected to the filter’s female connector, making it easy to disassemble and replace the filter.
Both end threaded nipple
Double-ended threaded nipple has threads on both ends, which can connect pipes or fittings that need threaded connection on both ends. This makes it more flexible in piping connections. Double-ended threaded nipples can be used directly to connect two pipes with external threads, or to connect a pipe with an external thread to a piece of equipment or pipe fitting with an internal thread.
In natural gas transmission piping systems, double-threaded nipples are used when it is necessary to connect two short pipes with external threads. One end of the double-ended threaded nipple is connected to the male thread of one pipe, and the other end is connected to the male thread of the other pipe, and the pipes are connected by thread tightening to ensure that the natural gas is transported in a sealed manner.
ASTM A733 Pipe Nipple Dimensions
| Nominal Size | OD of Pipes | Lengths of Thread | Wall of pipes | Pipe Nipple Lengths | |||
| DN | NPS | OD | L 2 min | T | L | ||
| Ⅰ | Ⅱ | Ⅲ | |||||
| 6 | 1/8 | 10.3 | 6.7 | STD,XS Sch40,Sch80 | 50 | 75 | 100 |
| 8 | 1/4 | 13.7 | 10.2 | ||||
| 10 | 3/8 | 17.1 | 10.4 | ||||
| 15 | 1/2 | 21.3 | 13.6 | STD,XS Sch40,Sch80 | 50 | 75 | 100 |
| 50 | 3/4 | 26.7 | 13.9 | ||||
| 25 | 1 | 33.4 | 17.3 | ||||
| 32 | 11/4 | 42.2 | 18.0 | STD,XS Sch40,Sch80 | 75 | 100 | 150 |
| 40 | 11/2 | 48.3 | 18.4 | ||||
| 50 | 2 | 60.3 | 19.2 | ||||
| 65 | 21/2 | 73.0 | 28.9 | STD,XS Sch40,Sch80 | 100 | 150 | 200 |
| 80 | 3 | 88.9 | 30.5 | ||||
| 90 | 31/2 | 101.6 | 31.8 | ||||
| 100 | 4 | 114.3 | 33.0 | STD,XS Sch40,Sch80 | 100 | 150 | 200 |
| 125 | 5 | 141.3 | 35.7 | ||||
| 150 | 6 | 168.3 | 38.4 | ||||
| 200 | 8 | 219.1 | 43.5 | STD,XS Sch40,Sch80 | 150 | 200 | 250 |
| 250 | 10 | 273.0 | 48.9 | ||||
| 300 | 12 | 323.8 | 54.0 | ||||
Material & Grades of Threaded Pipe Nipple
Common material grades of stainless steel threaded nipples include A182 F304/304L/304H – F316/316L – F317 – F310S – F321 – F347 – F904, etc., of which 304 is the most commonly used general-purpose stainless steel, suitable for water, air, and general corrosive environments; whereas 316/316L contains molybdenum, which has stronger corrosion resistance, and is commonly used in chemicals, seawater, and other more corrosive applications. and other more corrosive occasions. Choosing the right material according to the usage environment and cost requirements is the key to ensure the safety and durability of the piping system.
ASTM A182 Stainless Steel Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| 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 F304L | MIN | 8.00 | 18.00 | |||||||
| MAX | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 13.00 | 20.00 | 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 | 0.10 | |
| ASTM A182 F316L | MIN | 10.00 | 16.0 | 2.00 | ||||||
| MAX | 0.03 | 2.00 | 0.045 | 0.030 | 1.00 | 15.00 | 18.0 | 3.00 | 0.10 |
ASTM A182 Stainless Steel Mechanical Property
| MATERIAL | ASTM A182 F304 | ASTM A182 F304L | ASTM A182 F316 | ASTM A182 F316L |
| T.S (MPA) | 515 min | 485 min | 515 min | 485 min |
| Y.S (MPA) | 205 min | 170 min | 205 min | 170 min |
| EL % | 30 min | 30 min | 30 min | 30 min |
| R/A % | 50 min | 50 min | 50 min | 50 min |
Fields of Application
Water Supply and Drainage System: Construction, municipal and industrial water treatment.
Petrochemical: Oil, natural gas, chemical fluid transportation pipeline.
Food & Beverage: Beer, milk, beverage production line, high hygiene requirements.
Pharmaceutical industry: Pharmaceutical production, transportation, the requirement of pure materials without pollution.
Heating, cooling and ventilation systems.
Fire Fighting System: Ensure the durability and reliability of fire fighting pipes.
Marine and offshore engineering: seawater corrosion resistance.
Precautions for Packaging
Threaded pipe nipple should be especially protected from contact with sharp objects to prevent scratches or bruises when packaging. Therefore we use plastic pipe caps to protect the threaded ports.
Plastic film is one of the commonly used materials in the packaging of threaded short sections. It has good flexibility and moisture resistance. For some small threaded nipples, especially those used in relatively clean and dry environments, plastic film can provide basic protection.
We use high-strength, compression- and tear-resistant cardboard boxes to ensure that they can withstand the weight of threaded knuckles and the impact of transportation.
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
Stainless Steel Pipe Nipple Exported Countries
We Export Stainless Steel Pipe Nipple to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Europe, Africa, Asia, North America, South America, Middle East.etc