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cast iron
Note: See page 37 for pressure-temperature ratings.
Cast Iron Threaded Fittings
Class 125 (Standard)
figure 387
Square Head Plugs,
Cored
Size Unit Weight
Black Galv.
NPS DN lbs kg lbs kg
3/4 20 0.13 0.06 0.13 0.06
1 25 0.25 0.11 0.25 0.11
11/4 32 0.39 0.18 0.39 0.18
11/2 40 0.50 0.23 0.50 0.23
2 50 0.82 0.37 0.82 0.37
21/2 65 1.32 0.60 1.32 0.60
3 80 1.87 0.85 1.87 0.85
31/2 90 2.50 1.13 2.50 1.13
4 100 4.00 1.81 4.00 1.81
Figure 388
Square Head Plugs,
Solid
Size Unit Weight
Black Galv.
NPS DN lbs kg lbs kg
1/2 15 0.10 0.05 0.10 0.05
3/4 20 0.17 0.08 0.17 0.08
1 25 0.32 0.15 0.32 0.15
11/4 32 0.53 0.24 0.53 0.24
11/2 40 0.76 0.34 0.76 0.34
2 50 1.23 0.56 1.23 0.56
21/2 65 2.00 0.91 2.00 0.91
3 80 3.18 1.44 3.18 1.44
31/2 90 4.38 1.99 – –
Figure 380
Bar Plugs,
Solid
Size Unit Weight
Black
NPS DN lbs kg
4 100 5.68 2.58
5 125 9.60 4.35
6 150 14.78 6.70
Figure 389
Bar Plugs,
Cored
Size Unit Weight
Black Galv.
NPS DN lbs kg lbs kg
4 100 3.82 1.73 3.82 1.73
5 125 6.50 2.95 6.50 2.95
6 150 9.94 4.51 9.94 4.51
8 200 20.26 9.19 20.26 9.19
Figure 390
Countersunk Plugs Size Unit Weight
Black Galv.
See page 32 (Malleable Iron)
for other available sizes.
NPS DN lbs kg lbs kg
1 25 0.20 0.09 0.20 0.09
11/4 32 0.32 0.15 0.32 0.15
11/2 40 0.47 0.21 0.47 0.21
2 50 0.84 0.38 0.84 0.38
21/2 65 1.40 0.63 – –
3 80 2.25 1.02 – –
31/2 90 3.02 1.37 – –
4 100 3.76 1.71 – –
Figure 381
Cap Size Unit Weight
Black Galv.
NPS DN lbs kg lbs kg
21/2 65 2.55 1.16 – –
3 80 4.10 1.86 – –
4 100 6.40 2.90 – –
5 125 10.70 4.85 – –
6 150 14.20 6.44 14.20 6.44
8 200 27.23 12.35 27.23 12.35
According to specifcations, hex bushings and cored plugs should be used with 150# malleable iron and 125# cast iron. Solid plugs and face bushings are recommended for use with 250# and 300# fttings.