Threaded Flanges (TH Flanges) By

by yane Yang Sales Manager

Threaded flanges (TH Flanges) look very similar to Slip-On flanges but the main difference is that the threaded flange has been was bored out to match a specific pipe inside diameter. The backside of this center opening is then threaded with the relevant-sized tapered pipe thread.

Threaded Flanges (TH Flanges) are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Threaded flanges are threaded in the bore which match an external thread on the pipe. These threads are tapered in order to create a seal between the threaded flange and the pipe as the tapers approach the same diameter. Sometimes a seal weld is also used together with the threaded connection. This special type of flange is generally used for high pressure, yet smaller diameter applications. Obviously, the larger the flange is, the harder the ability to machine a thread would be. Threaded flanges are also not a good choice for a system that has a high level of torque.


Size: 1/2” to 60”, DN 12mm to DN 1500mm 
Pressure class: Class 150 to Class 2,500, PN 2.5 to PN 250
Facing: RF / RTJ

Dimensions are in millimeters unless otherwise indicated.


≤ 24 = 1.6 mm
> 24 = ± 3.2 mm


≤ 10 = ± 0.8 mm
≥ 12 = + 1.6 mm / – 0 mm


1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face
Tongue & Groove

Male-Female = ± 0.4 mm


Bolt Circle = 1.6 mm
Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
≤ 2½ = 0.8 mm max.
≥ 3 = 1.6 mm max.


Same as for Inside Diameter


≤ 12 = + 2.4 mm / – 1.6 mm
≥ 14 = ± 3.2 mm


≤ 18 = + 3.2 mm / – 0
≥ 20 = + 4.8 mm / – 0


≤ 18 = + 3.2 mm / – 0.8 mm
≥ 20 = + 4.8 mm / – 1.6 mm

These Threaded Flanges (TH Flanges) are available in the following range.

Stainless Steel: ASTM A182 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347, F347H, F904L. 
Duplex Stainless Steel: UNS S31803, UNS S32750 
Carbon Steel: ASTM A105, 
Alloy Steel: ASTM A182 F1, F11, F22, F5, F9, F91 
Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incoloy 800, 825, Hastelloy C22, C276 
Copper Alloys: Copper, Brass & Gunmetal 
Size: 1/8" NB TO 48"NB. 
Class: 150#, 300#, 400#, 600#, 900#, 1500#, 2500# 

Dimensional Standard

ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 
DIN: DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638, DIN 2673 

B.S: BS 4504, BS4504, BS1560, BS10

Standards, Dimensions & Weight
  • ASME/ANSI B16.5 Class 150 TH
  • ASME/ANSI B16.5 Class 300 TH
  • ASME/ANSI B16.5 Class 600 TH
  • ASME/ANSI B16.5 Class 900 TH
  • DIN 2565 PN6
  • DIN 2566 PN10

Uses of threaded flanges (TH Flanges) :

  • Threaded flanges can be fitted to pipes of various sizes without welding and this is one chief benefit for which these flanges are highly demanded.
  • They can be used in extremely high pressure applications, particularly at or near atmospheric temperature, where the necessary post weld heat treatment is not possible.
  • They are ideal for small diameter piping applications.
  • They are economical and time saving devices.
  • These threaded flanges are normally designed for non-cyclic applications.
  • The flanges are suitable to be used in applications where welding is hazardous.
  • They can be used in highly explosive areas.

The various types of threaded flanges (TH Flanges) are as follows:

  • Plain Threaded Flanges
  • Female Threaded Flanges
  • Male Threaded Flanges
SS Threaded FlangeCS Threaded FlangeAlloy Steel Threaded FlangeF5 Threaded Flange
F11 Threaded FlangeF22 Threaded FlangeF12 Threaded FlangeF91 Threaded Flange
SS 304 Threaded FlangeSS 304L Threaded FlangeSS 316 Threaded FlangeSS 316 L Threaded Flange
SS 317 Threaded FlangeSS 317L Threaded FlangeSS 321 Threaded FlangeSS 347H Threaded Flange
SS 904L Threaded FlangeDuplex Threaded FlangeSuper Duplex Threaded FlangeS31803 Threaded Flange
S32205 Threaded FlangeMonel 400 Threaded FlangeMonel K500 Threaded FlangeInconel Threaded Flange
Duplex Threaded FlangeSuper Duplex Threaded FlangeS32750 Threaded FlangeS32760 Threaded Flange
F51 Threaded FlangeF53 Threaded FlangeA694 F42 Threaded FlangeA694 F46 Threaded Flange
A694 F52 Threaded FlangeA694 F56 Threaded FlangeA694 F60 Threaded FlangeA694 F65 Threaded Flange
A694 F70 Threaded FlangeA350 LF2 Threaded FlangeA350 LF3 Threaded FlangeA707 L1 Threaded Flange
A707 L2 Threaded FlangeA707 L3 Threaded FlangeA105 Threaded FlangeF904L Threaded Flange
Inconel 625 Threaded FlangeIncoloy 800 Threaded FlangeIncoloy 800H Threaded FlangeIncoloy 800HT Threaded Flange
Hastelloy Threaded FlangeHastelloy B2 Threaded FlangesHastelloy B3 Threaded FlangeHastelloy C22 Threaded Flange
Hastelloy C276 Threaded FlangeKOC approved Threaded FlangeKNPC approved Threaded FlangeAAramco approved Threaded Flange

Source: Zhejiang Yaang Pipe Industry Co., Limited (

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About yane Yang Senior     Sales Manager

144 connections, 0 recommendations, 658 honor points.
Joined APSense since, June 7th, 2014, From wenzhou, China.

Created on Dec 31st 1969 18:00. Viewed 0 times.


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