ASME B16.5 | Threaded Flanges | RF / FF / RTJ | Class 150–2500
Threaded Flanges, also known as Screwed Flanges, are designed with an internal female thread that connects directly to externally threaded pipe. They provide a practical flanged connection without welding and are commonly used where welding is undesirable, impractical, or restricted.
Threaded Flanges are particularly suitable for selected small-bore, low-to-moderate temperature and pressure piping applications where the pipe material and service conditions permit a threaded connection.
Elite supplies Threaded Flanges in carbon steel, stainless steel, alloy steel, low-temperature carbon steel, duplex and super duplex stainless steel, nickel alloys, and copper-nickel alloys. Products are manufactured and supplied in accordance with applicable ASME, ASTM, MSS, EN, DIN, BS and customer project specifications.
| Category | Specification |
|---|---|
| Flange Type | Threaded / Screwed Flange |
| Nominal Size | NPS 1/2–24, where covered by the applicable standard and configuration |
| Pressure Classes | 150, 300, 400, 600, 900, 1500, 2500, where applicable |
| Facing | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), where applicable |
| Primary Dimensional Standard | ASME B16.5 |
| Connection | Internal pipe thread |
| Thread Type | NPT or other specified thread form, as applicable |
| Thread Standard | ASME B1.20.1 NPT, where specified |
| Bore | Threaded bore to suit specified pipe and thread requirements |
| Manufacturing | Forged, in accordance with applicable material and flange specifications |
| Surface Finish | Standard or customer-specified |
| Heat Treatment | As required by applicable material specification |
| Inspection | Visual, dimensional, chemical and mechanical testing as applicable |
| NDE | PMI, UT, MT, PT and other NDE methods as specified |
| Documentation | MTC, EN 10204 3.1/3.2, COC and inspection reports |
| Special Requirements | ITP, third-party inspection, NACE / ISO 15156 and customer specifications |
For process and industrial applications, Elite Threaded Flanges are primarily supplied in accordance with ASME B16.5.
Applicable standards may include:
For international applications, flange dimensions and pressure ratings can be supplied to the applicable project standard.
Carbon Steel
ASTM A105/A105N, ASTM A181, ASTM A350 LF2/LF3 and ASTM A694 F42, F46, F52, F60 and F65.
Stainless Steel
ASTM A182 F304/F304L, F316/F316L, F321/F321H, F347/F347H, F310/F310S, F317 and F904L.
Duplex & Super Duplex
ASTM A182 F51, F53 and F55.
Alloy Steel
ASTM A182 F1, F5, F9, F11, F12, F22, F91 and F92.
Nickel Alloys
Nickel 200/201, Monel 400/K500, Inconel 600/601/625/800/825, Hastelloy C276 and Alloy 20.
Copper-Nickel Alloys
UNS C70600 and C71500, including 90/10 and 70/30 Cu-Ni alloys.
Material selection is based on pressure, temperature, process fluid, corrosion conditions, threading requirements, mechanical requirements and applicable project specifications.
Raised Face — RF
The most common configuration for general process and industrial piping applications.
Product designation: Threaded RF Flange
Flat Face — FF
Used where a full-face mating surface is required, including selected piping and equipment applications.
Product designation: Threaded FF Flange
Ring Type Joint — RTJ
Available for applicable configurations where a metallic ring gasket sealing arrangement is required.
Product designation: Threaded RTJ Flange
Threaded Flanges can be supplied with thread configurations specified by the project.
Common U.S. thread requirements include:
ASME B1.20.1 — NPT (National Pipe Thread)
Other thread forms may be supplied where required by applicable international standards or customer specifications.
Elite Threaded Flanges can be supplied with complete quality documentation, including:
Elite supplies:
Threaded Flanges incorporate an internal female thread that engages directly with the external thread of the pipe.
Key characteristics include:
Threaded connections should be evaluated based on pressure, temperature, vibration, cyclic loading, corrosion, pipe material and service conditions. They are generally not preferred for severe cyclic or high-temperature services where a welded connection is more appropriate.
Threaded Flanges are commonly used in selected:
For quotation, please specify:
NPS + Class + Facing + Material + Thread Type + Thread Size + Standard + Quantity + Inspection Requirements
Example:
2″ Class 600 Threaded Flange, RF, ASME B16.5, ASTM A105N, NPT Female Thread, ASME B1.20.1, MTC EN 10204 3.1.
