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Large Diameter/Underground Conduit Dimensional Reference Chart
OEM/Miller, Division of Holm Industries
Single Wall Schematic Single Wall
A
B
C
 
*Minimum Wall Thickness
Single Wall
     
I.D.
O.D.
Total Width
1 1/2" in.
01.490
01.770
00.270
mm.
37.846
44.958
06.858
0.020
2" in.
02.045
02.504
00.289
mm.
51.943
63.602
07.341
0.020
3" in.
02.950
03.510
00.360
mm.
74.930
89.154
09.144
0.020
4" in.
03.980
04.730
00.650
mm.
101.092
120.412
16.510
0.020
Dual Wall
A
B
C
 
Inner Wall Thickness *Outer Wall Thickness
Dual Wall
     
I.D.
O.D.
Total Width
1 1/2" in.
01.490
01.770
00.270
mm.
37.846
44.958
06.858
.014-.026
.356-.660
.017-.029
.432-.737
2" in.
02.045
02.495
00.325
mm.
51.943
63.373
08.255
.014-.026
.356-.660
.017-.029
.432-.737
3" in.
02.950
03.510
00.360
mm.
74.930
89.154
09.144
.017-.037
.432-.940
.026-.040
.660-1.016
4" in.
03.980
04.730
00.650
mm.
101.092
120.142
16.510
.017-.037
.432-.940
.026-.040
.660-1.016

All dimension tolerances on this chart are +/- .015"/.381mm
Dual Wall Conduit Available in HDPE and LDPE Materials.
Single Wall Conduit Available in HDPE and Polypropylene Materials.
*Minimum wall thickness and therefore ID dimensions can be varied for specific applications.
Pull tape and colors are available on request.

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