What is Weldolet?

Weldolet is a type of self-reinforced branch fitting developed by a Company called Bonney Forge. It is used whenever branch connections are required in size where reducing tees are not available and/or when the branch connections are of smaller size as compared to header size or when tee cannot be accommodated in the piping header, weldolets are used.

It comes in full size or reducing size. Full size is when you take a branch of the same size as run pipe size for example 3 inches to 3 inches. And reducing size is when branch size is less than run pipe size. For example, 3 inches to 1 inch. Weldolet’s end is suited for the butt welding connection.

Weldolets are available in Standard Weight, Extra Strong, and Double Extra Strong (Schedule 160).

Weldolet® is a Registered Trademark of Bonney Forge.

Weldolets types

Weldolet Dimensions

During the Dimensional inspection of weldolets, you should check for

  • Outer & Inner Diameter of body
  • Length of the Hub
  • End preparation (Bevel angle)

Olets are designed for specific condition based on Process piping Code ASME B31.3, hence, Dimension is also specified by the designer. However, MSS-SP-97 provide dimension requirements for standard 90° self-reinforced branch connection with butt, socket and threaded end types

weldolet dimensions

Weldolet Dimensions Chart

weldolet cross-section
Piping Courses

Schedule STD Weldolet Dimensions

SizeSize in mmHeight AOD -BHole Dia CWeight in KG
1/4814.325.415.90.04
3/81019.0531.7519.050.07
1/21519.0534.9323.810.08
3/42022.2344.4530.160.11
12526.9953.9836.510.23
1 1/43231.7565.0944.450.36
1 1/24033.3473.0350.80.45
25038.188.965.090.79
2 1/26541.28103.1976.21.13
38044.45122.2493.661.81
3 1/29047.63142.88112.712.5
410050.8152.4120.652.86
513057.15179.3141.294.65
615060.33215.9169.866.44
820069.85263.53220.6610.66
1025077.79322.26274.6417.69
1230085.73377.83325.4426.76
1435088.9409.58357.1929.94
1640093.6463.55407.9934.02
1845096.84520.7458.7944
20500101.6571.550853.52
24600144.5717.5609.6101
26650155.6778660.4120
30750174.6893.6762190
36900206.41070914.4310
401000225.41187.61016435
4210502351244.61066.8540
481200241.314041219.2750

Schedule XS Weldolet Dimensions

SizeSize in mmHeight – AOD – BHole Dia – CWeight in KG
1/48N/A25.415.880.05
3/810N/A31.7519.050.07
1/21519.0534.9323.810.09
3/42022.2344.4530.160.14
12526.9953.9836.510.21
1 1/43231.7565.0944.450.41
1 1/24033.3473.0350.80.5
25038.188.965.090.79
2 1/26541.28103.1976.21.18
38044.45122.2493.661.86
3 1/29047.63136.53112.712.54
410050.8152.4120.652.9
615077.79225.43169.8610.43
820098.43292.1220.6616.78
1025093.66323.85265.1120.87
12300103.1379.41317.527.67
14350100.01431.8350.8431.75
16400106.36466.73403.2346.27
18450111.13523.88455.6158.97
20500119.06582.61509.5971.67
24600152.4722.2609.6142
26650165.1782.6660.4168
30750181896.8762218
36900212.71074.4914.4404
40100023511941016582
421050244.51250.81066.8590
4812002731425.61219.2910

Schedule XXS Weldolet Dimensions

SizeSize in mmHeight – AOD – BHole Dia – CWeight in KG
1/21528.5834.9314.290.11
3/42031.7544.4519.050.32
12538.150.825.40.38
1 1/43244.4561.9133.340.57
1 1/24050.869.8538.10.79
25055.5680.9642.860.97
2 1/26561.9196.8453.981.53
38073.03120.6573.032.87
410084.14152.498.434.76
513093.66187.33122.246.46
6150104.78220.66146.0512.7
8200111.12284.16173.0420.41
10250125.41312.74215.938.56

Schedule 160 Weldolet Dimensions

SizeSize in mmHeight – AOD – BHole Dia – CWeight in KG
1/21528.5834.9314.290.11
3/42031.7544.4519.050.32
12538.150.825.40.38
1 1/43244.4561.9133.340.57
1 1/24050.869.8538.10.79
25055.5680.9642.860.97
2 1/26561.9196.8453.981.53
38073.03120.6573.032.87
410084.14152.498.434.76
513093.66187.33122.246.46
6150104.78220.66146.0512.7
8200111.12284.16173.0420.41
10250125.41312.74215.938.56

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