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IN THE PIPING INDUSTRY
Threaded Fittings
| Class 3000 | Centre-to-end | Centre-to-end | Minimum Length of Thread | OD of Band | Min Wall | Min End Wall | End-to-end Couplings | End-to-end Caps | OD | ||||||||||||
| Note: | 1 | 2 | 3 | 4 | 5 | ||||||||||||||||
| DN | NPS | A | C | B | L2 | H | G (1) | G (2) | W | P | D | ||||||||||
| 6 | 1/8 | 21 | 17 | 6.4 | 6.7 | 22 | 3.18 | 4.8 | 32 | 19 | 16 | ||||||||||
| 8 | 1/4 | 25 | 19 | 8.1 | 10.2 | 25 | 3.30 | 4.8 | 35 | 25 | 19 | ||||||||||
| 15 | 1/2 | 28 | 22 | 9.1 | 10.4 | 33 | 3.51 | 4.8 | 38 | 25 | 22 | ||||||||||
| 10 | 3/8 | 33 | 25 | 10.9 | 13.6 | 38 | 4.09 | 6.4 | 48 | 32 | 28 | ||||||||||
| 20 | 3/4 | 38 | 28 | 12.7 | 13.9 | 46 | 4.32 | 6.4 | 51 | 37 | 35 | ||||||||||
| 25 | 1 | 44 | 33 | 14.7 | 17.3 | 56 | 4.98 | 9.7 | 60 | 41 | 44 | ||||||||||
| 32 | 1-1/4 | 51 | 35 | 17.0 | 18.0 | 62 | 5.28 | 9.7 | 67 | 44 | 57 | ||||||||||
| 40 | 1-1/2 | 60 | 43 | 17.8 | 18.4 | 75 | 5.56 | 11.2 | 79 | 64 | 44 | ||||||||||
| 50 | 2 | 64 | 44 | 19.0 | 19.2 | 84 | 7.14 | 12.7 | 86 | 48 | 76 | ||||||||||
| 65 | 2-1/2 | 83 | 52 | 23.6 | 28.9 | 102 | 7.65 | 15.7 | 92 | 60 | 92 | ||||||||||
| 80 | 3 | 95 | 64 | 25.9 | 30.5 | 121 | 8.84 | 19.0 | 108 | 65 | 108 | ||||||||||
| 100 | 4 | 114 | 79 | 27.7 | 33.0 | 152 | 11.18 | 22.4 | 121 | 68 | 140 | ||||||||||
| Note:1 | For 90deg Elbows, Tees and Crosses | ||||||||||||||||||||
| 2 | For 45deg Elbows | ||||||||||||||||||||
| 3 | Dimension B is minimum length of perfect thread. The length of useful thread (B plus threads with fully formed roots and flat crests) shall not be less than L2 (effective length of external thread) required by American National Standard for Pipe Threads (ASME B1.20.1; see para. 6.3) | ||||||||||||||||||||
| 4 | For 90deg, 45deg Elbows, Tees and Crosses | ||||||||||||||||||||
| 5 | For Couplings, Half Couplings and Caps. The wall thickness away from the threaded ends shall meet the minimum wall thickness requirements of G(1) | ||||||||||||||||||||
| Class 3000 | Min Length | Min Square Height | Min Width Flats | Min Length | Nominal Head Dia | Nominal Width Flats | Min Hex Height Bush | Min Hex Height Bush | |||||||||||||
| Note: | 2 | 2 | |||||||||||||||||||
| DN | NPS | A | B | C | D | E | F | G | H | ||||||||||||
| 6 | 1/8 | 10 | 6 | 7.15 | 35 | 10 | 11.11 | - | 6 | ||||||||||||
| 8 | 1/4 | 11 | 6 | 9.55 | 41 | 14 | 15.88 | 3 | 6 | ||||||||||||
| 15 | 1/2 | 13 | 8 | 11.11 | 41 | 18 | 17.46 | 4 | 8 | ||||||||||||
| 10 | 3/8 | 14 | 10 | 14.29 | 44 | 21 | 22.23 | 5 | 8 | ||||||||||||
| 20 | 3/4 | 16 | 11 | 15.88 | 44 | 27 | 26.99 | 6 | 10 | ||||||||||||
| 25 | 1 | 19 | 13 | 20.64 | 51 | 33 | 34.93 | 6 | 10 | ||||||||||||
| 32 | 1-1/4 | 21 | 14 | 23.81 | 51 | 43 | 44.45 | 7 | 14 | ||||||||||||
| 40 | 1-1/2 | 21 | 16 | 28.58 | 51 | 48 | 50.80 | 8 | 16 | ||||||||||||
| 50 | 2 | 22 | 18 | 53.34 | 64 | 60 | 63.50 | 9 | 18 | ||||||||||||
| 65 | 2-1/2 | 27 | 19 | 38.10 | 70 | 73 | 76.20 | 10 | 19 | ||||||||||||
| 80 | 3 | 28 | 21 | 42.86 | 70 | 89 | 88.90 | 10 | 21 | ||||||||||||
| 100 | 4 | 32 | 25 | 63.50 | 76 | 114 | 117.48 | 13 | 25 | ||||||||||||
| Note:1 | ASME B16.11 Cautionary Note Regarding Hex Bushings: Hex head bushings of one-size reduction should not be used in services where they might be subject to harmful loads and forces other than internal pressures | ||||||||||||||||||||
| 2 | Manufacturer’s applied tolerance shall ensure dimension will fit U.S. Customary tooling. | ||||||||||||||||||||
FAQ
What are the limitations to threaded fittings?
Lower pressure rating: Threaded fittings have a lower pressure rating than some other types of fittings, making them less suitable for high-pressure applications.
Risk of degradation: Threaded fittings can be worn down or degraded over time, particularly in applications where they are exposed to chemicals, heat, or pressure.
Nevertheless, threaded fittings remain a popular choice for low- to moderate-pressure applications where convenience, accessibility, and ease of disassembly are important factors.
What are the advantages of threaded fittings?
Ease of installation: Threaded fittings are easy to install and don’t require specialized tools or welding knowledge.
Flexibility: Threaded fittings can be easily adjusted or removed as needed, making them versatile and adaptable to different piping needs.
Accessibility: Threaded fittings can be used in hard-to-reach areas where welding or other connection methods may be difficult.
Leak-proof connections: Threaded fittings provide a tight, leak-proof connection that is durable and long-lasting.
What are threaded fittings?
Threaded fittings are a type of pipe fitting used to connect pipes or components in a piping system. They are made with threaded connections, which allows them to be screwed together for a secure, leak-proof connection. Threaded fittings come in a wide range of shapes and sizes to accommodate different pipe sizes and types, and they are typically made from materials like steel, brass, or PVC.
Threaded fittings can be used in a variety of applications, including water and gas distribution, chemical processing, and oil and gas production. They are commonly used when a temporary or semi-permanent joint is required or when disassembly is needed for maintenance or repair.
Some common types of threaded fittings include:
Elbows: These fittings are designed to change the direction of a pipe and are available in different angles.
Couplings: These fittings join two pipes together and come in full and half couplings.
Tees: These fittings are used to split the flow of material in a piping system
Reducers: These fittings are used to connect pipes of different sizes.