Large Diameter Stepped Coupling

OUTSIDE DIAMETER CONVERSION CHART
NOMINAL BORE
inch .5 .75 1 1.25 1.5 2 2.5 3 3.5 4 5 6 7 8 9 10
mm 15 20 25 32 40 50 65 80 90 100 125 150 175 200 225 250 2
STANDARD OUTSIDE DIAMETER (O.D.)
IMPERIAL
CAST IRON
&
ASBESTOS
CEMENT
(TURNED END)
STEEL
uPVC
ABS
DUCTILE
IRON
METRIC
ASBESTOS
CEMENT
(TURNED END)
BS 78 CLASS
1981 ABCD
BS 1211 CLASS 2.20 2.72 3.24 3.76 4.80 5.90 6.98 8.06 9.14 10.20 11.26
(UTI 27” NB) AB ONLY 55.9 69.1 82.3 95.5 121.9 149.9 177.3 204.7 232.2 259.1 286.0
BS 78
BS 486 CLASS 2.20 2.72 3.24 3.76 4.80 5.90 6.98 8.06 9.14 10.20 11.26
1966 CD ONLY 55.9 69.1 82.3 95.5 121.9 149.9 177.3 204.7 232.2 259.1 286.0
ISO/4200
NON 2.25 3.25
STANDARD 57.0 82.5
SERIES 1 21.3 26.9 33.7 42.4 48.3 60.3 76.1 88.9 101.6 114.3 139.7 168.3 219.1 273.0
SERIES 2 25.0 32.0 40.0 57.0 63.5 70.0 101.6 127.0 133.0
SERIES 3
}
25.4 30.0 44.5 54.0 73.0 82.5 108.0 141.3 159.0 193.7 244.5
35.0 152.4 177.8
BS 1387 21.3 26.9 33.7 42.4 48.3 60.3 76.1 88.9 114.3 139.7 165.1
BS 534 60.3 76.1 88.9 114.3 139.7 168.3 193.7 219.1 244.5 273.0
BS 3600 21.3 26.9 33.7 42.4 48.3 60.3 76.1 88.9 101.6 114.3 139.7 168.3 193.7 219.1 244.5 273.0
& BS 1600
API 5L 21.3 26.7 33.4 42.2 48.3 60.3 73.0 88.9 101.6 114.3 141.3 168.3 219.1 273.0
UTI 36” NB
BS 3505 21.3 26.9 33.7 42.4 48.3 60.3 88.9 114.3 140.2 168.3 219.1 273.0
BS 3506 21.3 26.9 33.7 42.4 48.3 60.3 75.1 88.9 114.3 140.2 168.3 193.7 219.1 244.5 273.0
BS 5391 21.3 26.9 33.7 42.4 48.3 60.3 88.9 114.3 168.3 219.1
BS 4772 56.0 66.0 82.0 144.0
DIN 28601, 28602 DIN DIN DIN 98.0 118.0 DIN 170.0 222.0 274.0
28603, 28605 28601 28605 28605 28601/3
BS 486 1981 CLASS 15 177.0 232.0 259.0 286.0
CLASS 20 232.0 259.0 286.0
CLASS 25 69.0 96.0 122.0 177.0 240.0 268.0 295.0
METRIC uPVC & PE HAVE A DESIGNATED NOMINAL BORE WHICH IS USUALLY THE SAME AS THE OUTSID
uPVC & POLYETHYLENE (METRIC) BS 5556 ISO/161/1 16 20 25 32 40 50 63 75 90 110 125 140 160 180 200 225
© Viking Johnson 1999