Stainless steel threaded pipe fittings are small-bore piping components that are used to connect pipelines with the help of a threaded rod, making it easier to install and maintain without welding. These stainless steel pipe fittings are made in accordance with ASME B16.11 standards that come in different pressure classes, such as 2000, 3000 and 6000, which depend on the service conditions. This is usually available in various sizes, 1/8 to 4. All these fittings are made in various grades, which include the SS 304, 304L, 316, 347 and the duplex stainless steel, which can simply withstand corrosion and give strength to your structure. Stainless steel fitting or SS threaded pipe fitting is widely applied in oil and gas, chemical, pharmaceutical and power industries. Amardeep Steel is one of the most trusted manufacturers and suppliers with an MTC certificate across the world.
What are the SS Threaded Pipe Fittings
Stainless steel threaded fittings are threaded connector fittings, either with male or female threads (NPT or BSP) that are used to connect pipelines without welding, thus installation is quick and easy. These threaded stainless steel pipe connections are favored on those applications where they are required to have an easy disconnection, less downtime and also when they are performing a low cost maintenance. SS threaded fittings or stainless steel forged fittings are also commonly used in utility systems, instrument connections and in lines that are heavily used in maintenance and in these applications they are often given low to medium pressure service where frequent access is needed, often a very useful alternative to socket weld fittings.
Specifications of Stainless steel Threaded Pipe Fittings
|
Parameter |
Details |
|---|---|
|
Primary Standard |
ASME/ANSI B16.11 — Forged Fittings, Threaded End |
|
Related Standards |
MSS SP-79 | MSS SP-83 | MSS SP-95 | BS 3799 |
|
Thread Standard |
ASME B1.20.1 (NPT) | BS 21 (BSP / BSPT) |
|
Material Standard |
ASTM A182 |
|
Size Range |
NPS 1/8" to 4" (up to 6" on request) |
|
Pressure Classes |
Class 2000, 3000, 6000 |
|
End Connections |
Threaded — NPT, BSP, BSPT, Metric |
|
Marking |
Manufacturer name/mark | Material grade | Class | Heat number |
|
Test / Inspection |
EN 10204 3.1 MTC | Hydro test | Visual + Dimensional |
|
Certifications |
ISO 9001 | PED | TUV / BV / SGS third-party inspection |
Types Of Forged Threaded Pipe Fittings
Forged Threaded Elbow
Forged Threaded Equal & Unequal Tee
Threaded Equal & Unequal Cross
Threaded Half & Full Couplings
Threaded Reducing Couplings
Threaded Cap
High Pressure Forged Fittings
Threaded Reducing Insert
Threaded Bushing
Threaded Pipe Nipples
Threaded Hex Nipples
Threaded Plug
Threaded Unions
Pressure Classes of Stainless steel Threaded Pipe Fittings
The stainless steel threaded fittings come in different pressure classes and industries use according to that and the information about it is given below.
|
Class |
Compatible Pipe Schedule |
Max Working Pressure |
|---|---|---|
|
Class 2000 |
Sch 80 / XS |
2000 PSI |
|
Class 3000 |
Sch 160 |
3000 PSI |
|
Class 6000 |
XXS |
6000 PSI |
Different grades of Stainless Steel threaded fittings
|
Grade |
UNS No. |
ASTM Specification |
|
SS 304 / 304L |
S30400 / S30403 |
ASTM A182 F304 / F304L |
|
SS 316 / 316L |
S31600 / S31603 |
ASTM A182 F316 / F316L |
|
SS 316H |
S31609 |
ASTM A182 F316H |
|
SS 321 / 321H |
S32100 |
ASTM A182 F321 / F321H |
|
SS 347 / 347H |
S34700 |
ASTM A182 F347 / F347H |
|
SS 317 / 317L |
S31700 |
ASTM A182 F317 / F317L |
|
Duplex 2205 |
S31803 / S32205 |
ASTM A182 F51 |
|
Super Duplex 2507 |
S32750 |
ASTM A182 F53 |
Dimensions Chart of Stainless Steel Threaded Pipe Fittings
The dimension of the Stainless steel threaded fittings depend on the different classes and the detailed information about this is listed below.
Stainless steel Threaded fitting 90° Elbow Dimensions (Class 3000 / 6000)
|
NPS |
OD (mm) |
Centre-to-End A — Cl.3000 (mm) |
Centre-to-End A — Cl.6000 (mm) |
Thread Lgth B (mm) |
|---|---|---|---|---|
|
1/8" |
10.3 |
21 |
21 |
7 |
|
1/4" |
13.7 |
21 |
25 |
9 |
|
3/8" |
17.2 |
24 |
29 |
10 |
|
1/2" |
21.3 |
29 |
36 |
13 |
|
3/4" |
26.7 |
33 |
41 |
14 |
|
1" |
33.4 |
41 |
52 |
17 |
|
1-1/4" |
42.2 |
51 |
63 |
18 |
|
1-1/2" |
48.3 |
57 |
73 |
19 |
|
2" |
60.3 |
70 |
89 |
22 |
|
2-1/2" |
73.0 |
83 |
108 |
25 |
|
3" |
88.9 |
95 |
127 |
27 |
|
4" |
114.3 |
117 |
159 |
32 |
SS Threaded Full Coupling Dimensions (Class 3000 / 6000)
|
NPS |
Length L — Cl.3000 (mm) |
Length L — Cl.6000 (mm) |
OD (mm) |
|---|---|---|---|
|
1/8" |
21 |
27 |
14 |
|
1/4" |
24 |
30 |
17 |
|
3/8" |
26 |
33 |
21 |
|
1/2" |
32 |
41 |
27 |
|
3/4" |
35 |
44 |
32 |
|
1" |
41 |
52 |
41 |
|
1-1/4" |
48 |
60 |
50 |
|
1-1/2" |
52 |
67 |
57 |
|
2" |
62 |
79 |
70 |
|
2-1/2" |
73 |
95 |
83 |
|
3" |
83 |
108 |
95 |
|
4" |
102 |
133 |
117 |
NPT vs BSP Threads — Key Differences
They are both standard thread forms of stainless steel threaded fittings. The US standard is NPT, and BSP applies to Europe, Middle East, and the majority of Asia. They cannot be interchanged- thread angle and pitch are different. Amardeep Steel offers fittings either in thread forms on order.
|
Feature |
NPT |
BSP / BSPT |
|---|---|---|
|
Standard |
ASME B1.20.1 |
BS 21 |
|
Thread Angle |
60° |
55° |
|
Taper |
Always tapered |
Parallel (BSPP) or Tapered (BSPT) |
|
Common Regions |
USA, Canada, Japan |
UK, Europe, Middle East, Asia |
|
Sealing Method |
PTFE tape / thread compound |
Sealant or bonded seal washer |
|
Interchangeable? |
No — incompatible with BSP |
No — incompatible with NPT |
Applications and Industrial use of Stainless steel Threaded Pipe Fittings
- Oil & gas
- Chemical & petrochemical
- Pharmaceutical
- Food & beverage
- Power generation
- Water treatment
- Marine & offshore
- HVAC & plumbing
Frequently Asked Questions - Forged Threaded Pipe Fittings
What is the difference between SS 304 and SS 316 threaded fittings?
SS 316 has molybdenum, giving it better corrosion resistance (especially in chemicals and marine environments) than SS 304.
What thread standard is used — NPT or BSP?
Both are used—NPT (American standard) and BSP/BSPT (British standard), depending on project requirements.
What pressure classes are available?
Stainless steel threaded fittings are available in Class 2000, 3000, and 6000.
What is the size range for Stainless steel threaded pipe fittings?
The stainless steel threaded fitting usually comes in sizes from 1/8" to 4".
What certifications do Amardeep Steel's fittings come with?
The Amardeep steel provides the stainless steel threaded fitting withEN 10204 3.1 Mill Test Certificate (MTC).
What is the difference between a coupling and a union?
A coupling permanently joins two pipes, while a union allows easy disconnection for maintenance without cutting the pipe.
