SOCKET WELDING REDUCER INSERTS
Reducer inserts comply with MSS Standard SP-79.
They enable standard socket welding fittings to be
used for making any combination of pipe line
reductions, quickly and economically.
Socket welding reducer inserts serve the same
purpose as threaded reducing bushings
with threaded fittings.		 Type 1 Reducer Insert   
TYPE 1 REDUCER INSERT TYPE 2 REDUCER INSERT
NOM. SOCKET SHANK Class 3000 - For Use With Class 6000 - For Use With
PIPE DEPTH Schedule 40 and 80 Pipe Schedule 160 Pipe
SIZE Dia.
B		 Min.
J		 Dia.
SD		 Type A D C SL RL Type A D C SL RL
3/8 x 1/4 0.56 0.38 0.68 1 .75 .36 .149 .56 - 1 .81 .25 .181 .62 -
1/2 x 3/8 0.70 0.38 0.84 1 .81 .49 .158 .62 - 1 .88 .36 .198 .68 -
x 1/4 0.56 0.38 0.84 1 .81 .36 .149 .68 - 1 .81 .25 .181 .68 -
3/4 x 1/2 0.86 0.38 1.05 1 .88 .62 .184 .69 - 1 1.00 .46 .235 .75 -
x 3/8 0.70 0.38 1.05 2 .62 .49 .158 - 1.06 1 .88 .36 .198 .75 -
x 1/4 0.56 0.38 1.05 2 .69 .36 .149 - 1.06 2 .88 .25 .181 - 1.26
1 x 3/4 1.07 0.50 1.31 1 .94 .82 .193 .75 - 1 1.12 .61 .274 .81 -
x 1/2 0.86 0.38 1.31 2 .62 .62 .184 - 1.12 1 1.12 .46 .235 .81 -
x 3/8 0.70 0.38 1.31 2 .69 .49 .158 - 1.12 2 .88 .36 .198 - 1.31
x 1/4 0.56 0.38 1.31 2 .75 .36 .149 - 1.12 2 .94 .25 .181 - 1.31
NOM. SOCKET SHANK Class 3000 - For Use With Class 6000 - For Use With
PIPE DEPTH Schedule 40 and 80 Pipe Schedule 160 Pipe
SIZE Dia.
B		 Min.
J		 Dia.
SD		 Type A D C SL RL Type A D C SL RL
1 1/4 x 1 1.33 0.50 1.66 1 1.00 1.05 .224 .81 - 1 1.19 .81 .312 .88 -
x 3/4 1.07 0.50 1.66 2 .69 .82 .193 - 1.25 2 .81 .61 .274 - 1.37
x 1/2 0.86 0.38 1.66 2 .75 .62 .184 - 1.25 2 .88 .46 .235 - 1.37
x 3/8 0.70 0.38 1.66 2 .81 .49 .158 - 1.25 2 .94 .36 .198 - 1.37
x 1/4 0.56 0.38 1.66 2 .88 .36 .149 - 1.25 2 1.00 .25 .181 - 1.37
1 1/2 x 1 1/4 1.68 0.50 1.90 1 1.12 1.38 .239 .88 - 1 1.38 1.16 .312 1.00 -
x 1 1.34 0.50 1.90 2 .69 1.05 .224 - 1.31 1 1.12 .81 .312 1.00 -
x 3/4 1.07 0.50 1.90 2 .75 .82 .193 - 1.31 2 1.00 .61 .274 - 1.56
x 1/2 0.86 0.38 1.90 2 .81 .62 .184 - 1.31 2 1.06 .46 .234 - 1.56
x 3/8 0.70 0.38 1.90 2 .88 .49 .158 - 1.31 2 1.12 .36 .198 - 1.56
2 x 1 1/2 1.92 0.50 2.38 1 1.25 1.61 .250 1.00 - 1 1.81 1.34 .351 1.56 -
x 1 1/4 1.68 0.50 2.38 2 .81 1.38 .239 - 1.50 2 .94 1.16 .312 - 1.81
x 1 1.34 0.50 2.38 2 .88 1.05 .224 - 1.50 2 1.00 .82 .312 - 1.81
x 3/4 1.07 0.50 2.38 2 .94 .82 .193 - 1.50 2 1.06 .61 .274 - 1.81
x 1/2 0.86 0.38 2.38 2 1.00 .62 .184 - 1.50 2 1.12 .46 .235 - 1.81
NOM. SOCKET SHANK Class 3000 - For Use With Class 6000 - For Use With
PIPE DEPTH Schedule 40 and 80 Pipe Schedule 160 Pipe
SIZE Dia.
B		 Min.
J		 Dia.
SD		 Type A D C SL RL Type A D C SL RL
2 1/2 x 2 2.41 0.62 2.88 1 1.81 2.07 .273 1.50 - 1 1.68 1.69 .430 1.25 -
x 1 1/2 1.92 0.50 2.88 2 1.38 1.61 .250 - 2.12 - - - - - -
x 1 1/4 1.68 0.50 2.88 2 1.44 1.38 .239 - 2.12 - - - - - -
x 1 1.34 0.50 2.88 2 1.50 1.05 .226 - 2.12 - - - - - -
x 3/4 1.07 0.50 2.88 2 1.56 .82 .193 - 2.12 - - - - - -
3 x 2 1/2 2.91 0.62 3.50 1 1.50 2.47 .345 1.25 - - - - - - -
x 2 2.41 0.62 3.50 2 1.00 2.07 .273 - 1.87 - - - - - -
x 1 1/2 1.92 0.50 3.50 2 1.12 1.61 .250 - 1.87 - - - - - -
x 1 1/4 1.68 0.50 3.50 2 1.19 1.38 .239 - 1.87 - - - - - -
x 1 1.34 0.50 3.50 2 1.25 1.05 .224 - 1.87 - - - - - -
To mimimize the posibility of cracking of the fillet welds. it is recomended that the shank portion of the reducer be withdrawn approximately 1/16 away from contact with the bottom of the socket before starting the weld. Likewise the pipe is to be kept away from contacting the bottom of the reducer socket before welding.

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