Threaded Flange

Threaded Flange

Threaded flange, also known as screwed flange, has a thread inside the flange bore that fits on the pipe with a matching male thread. This type of joint connection is quick and easy to use. However, threaded flange is not suitable for high pressure or temperature applications. Threaded flange is commonly used in utilities such as air and water. 

What is a Threaded Flange?


Threaded flange is similar to slip on flange except that the bore is threaded. It can be assembled without welding. This explains its use in low pressure services at normal atmospheric temperatures and in highly explosive areas where welding poses a risk. As the tapers approach the same diameter, the threads seal between the threaded flange and the pipe. In addition to the threaded connection,  a seal weld is sometimes used. 

Also, they are available in a variety of sized and materials. The thread must be concentric with the axis of the flange opening, and alignment variations (perpendicular to the flange face) must be not more than 5mm per metre. Threaded flanges are available in NPS 1/2 through NPS 24 sizes and pressure ratings of Class 150, 300, 400, 600, and 900. NPS 1/2 to NPS 2-1/2 are available in Class 1500 and Class 2500 sizes. 

Details of Threaded Flange
Connecting a pipe to the threaded flange
Key Characteristics of Threaded Flange 
  • No welding is required. 
  • Extremely good for small pipe sizes.
  • Larger load, especially when subjected to higher torque, should be avoided.
Uses of Threaded Flange 
  • Threaded flanges can be fitted to pipes of various sizes without welding. It is one of the main reasons why these flanges are so popular. 
  • It can be used in extremely high-pressure applications, particularly where post-weld heat treatment is not possible. 
  • It is ideal for piping with small diameters. 
  • Cost-effective and time-saving diameters. 
  • Threaded flanges are typically used in non-cyclic applications. 
  • The flanges can be used in applications where welding is dangerous. 
  • It can be used in potentially explosive environments. 
Details of Threaded Flange
Advantages & Disadvantages of Threaded Flange 
  • Advantages
    • The threaded flange joint does not require welding to be assembled. Also, a pipe with tapered threads on both ends can be easily assembled with the threaded flange. Because of this feature, the threaded flange is well-suited to extreme pressure services that operate at normal ambient temperatures. And also, in highly explosive areas where welding may pose a hazard.
  • Disadvantages
    • The disadvantages of threaded flanges are obvious as well. The crevices formed between the external and internal threads have the potential to easily capture and retain process fluid. This makes the threaded connection vulnerable to crevice corrosion. It occurs when process fluid penetrates the thread region and causes failure. Furthermore, threaded joints are also significant stress risers. A relatively small number of cycles of expansion and contraction or movement brought on by misalignment may cause the threaded flange to fail. This is because of tightening increases stress in the thread region.
    • Besides that, threaded steel flanges are typically limited to water or air services in sizes NPS 6 (DN 150) or smaller, with a design temperature of no more than 250 °F. They are also not suitable for high temperature, cyclic stress, or corrosive fluid conditions. The dimensional tolerances of threaded flanges are nearly identical to those of slip on flanges. 

Product Tags

Carbon steel flanges Stainless steel flanges Blind flanges Threaded flanges Socket-weld flange Slip-on flange Lap joint flange Weld neck flange Specialty flange Orifice Flange 1/2″ flange 48″ flange 15mm flange 1200 mm flange 150# flange 300# flange 600# flange 900# flange 1500# flange 2500# flange Raised Face RF Ring Type Joint RTJ Flat Face FF Male & Female M&F Tongue Groove T&G SCH 10 flange SCH 20 flange SCH 30 flange SCH 40 flange SCH 60 flange SCH 80 flange SCH 100 flange SCH 120 flange SCH 140 flange SCH 160 flange SCH STD SCH XS SCH XXS SCH 10s SCH 40s flanges supplier malaysia SCH 80s ASME B16.1 ASME B16.5 ASME B16.20 ASME B16.21 ASME B16.24 ASME B16.34 ASME B16.36 ASME B16.42 ASME B16.47 MSS SP-6 MSS SP-9 MSS SP-25 MSS SP-44 MSS SP-53 MSS SP-54 MSS SP-55 MSS SP-75 MSS SP-106 API 605 API 6A API 6B ASME SA/A105N ASTM ASTM A694 F42 ASTM A694 F46 ASTM A694 F52 ASTM A694 F60 ASTM A694 F65 ASTM A694 F70 ASTM A707 L1 ASTM A707 L2 ASTM A707 L3 ASTM A707 L4 ASTM A707 L5 ASTM A707 L6 ASTM A707 L7 ASTM A707 L8 ASME/ASTM SA/A350 LF1 ASME/ASTM SA/A350 LF2 ASME/ASTM SA/A350 LF3 ASME/ASTM SA/A350 LF6 ASME/ASTM SA/A182F2 ASME/ASTM SA/A182F5 ASME/ASTM SA/A182F9 ASME/ASTM SA/A182F11 ASME/ASTM SA/A182F12 ASME/ASTM SA/A182F22 ASME/ASTM SA/A182F91 ASME/ASTM SA/A182F304/304L ASME/ASTM SA/A182F316/316L ASME/ASTM SA/A182F309 ASME/ASTM SA/A182F310 ASME/ASTM SA/A182F304H ASME/ASTM SA/A182F310H ASME/ASTM SA/A182F317/317L


Blind Flange, Slip on Flange, Welding Neck Flange, Socket Weld Flange, Threaded Flange, Lap Joint Flange, Anchor Flange, Orifice Flange

Size Range

1/2" (15mm) - 48" (1200mm)


150#, 300#, 600#, 900#, 1500#, 2500#

Type Available

Raised Face RF, Ring Type Joint RTJ, Flat Face FF, Male & Female M&F, Tongue Groove T&G


SCH 10, SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160


SCH 10s, SCH 40s, SCH 80s


ASME B16.1, ASME B16.5, ASME B16.20, ASME B16.21, ASME B16.24,

ASME B16.34, ASME B16.36, ASME B16.42, ASME B16.47

MSS SP-6, MSS SP-9, MSS SP-25, MSS SP-44, MSS SP-53, MSS SP-54, 

MSS SP-55, MSS SP-75, MSS SP-106

API 605, API 6A, API 6B


Carbon Steel


High Yield Carbon Steel

ASTM A694 F42/ 46/ 52/ 60/ 65/ 70

ASTM A707 L1~ L8

Low Temp Carbon Steel

ASME/ASTM SA/A350 LF1/ 2/ 3/ 6

Chrome Moly

ASME/ASTM SA/A182F2, F5 ,F9, F11, F12, F22, F91

Stainless Steel

ASME/ASTM SA/A182F304/304L, 316/316L, 309, 310, 304H, 310H, 317/317L, 321, 321H, 347, 347H, 904L

Duplex/ Super Duplex

UNS S31803, S32205, S32750, S32760
ASME/ASTM SA/A182F51, 53, 55, 60

Nickel Alloy

UNS N02200 (Nickel 200), UNS N02201 (Nickel 201)
UNS N04400 (Monel 400), ), UNS N06600 (Inconel 600)
UNS N06601 (Inconel 601), UNS N06625 (Inconel 625)
UNS N08810 (Incoloy 800H), UNS N08811 (Incoloy 800HT)
UNS N08825 (Inconel 825), UNS N010276 (Hastelloy C276)


HIC, PED 2014/68/EU, NACE MR0175, NORSOK, Weld Overlay available

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