Threaded Flanges

Threaded 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 can be used in very high pressure services and their major advantage is that they can be assembled without welding.

Uses of threaded 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 are as follows:

  • Plain Threaded Flanges
  • Female Threaded Flanges
  • Male Threaded Flanges

Meterial & Standard for flanges:
CARBON STEEL

ASTM A 105, ASTM A 181

ALLOY STEEL

ASTM A 182, GR F1, F11, F22, F5, F9, F91

SIZE

1/8″ NB TO 48″NB.

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

Standard ANSI
ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48

DIN
DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673

B.S
BS4504 , BS4504, BS1560, BS10

Dimensional Tolerances of Threaded flanges ASME B16.5

Dimensions are in millimeters unless otherwise indicated.

OUTSIDE DIAMETER ≤ 24 = 1.6 mm
> 24 = ± 3.2 mm
INSIDE DIAMETER ≤ 10 = ± 0.8 mm
≥ 12 = + 1.6 mm / – 0 mm
DIAMETER OF CONTACT FACE 1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face
Tongue & Groove Male-Female = ± 0.4 mm
DRILLING 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.
DIAMETER OF COUNTERBORE Same as for Inside Diameter OUTSIDE DIAMETER OF HUB ≤ 12 = + 2.4 mm / – 1.6 mm
≥ 14 = ± 3.2 mm
THICKNESS ≤ 18 = + 3.2 mm / – 0
≥ 20 = + 4.8 mm / – 0
LENGTH THRU HUB ≤ 18 = + 3.2 mm / – 0.8 mm
≥ 20 = + 4.8 mm / – 1.6 mm
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