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MARYLAND METRICS
THREAD DATA CHARTS

MARYLAND METRICS -- THREAD DATA CHART:
ELECTRICAL THREAD -- BRITISH ET (Conduit to BS 31)
Imperial Conduit (ET) to BS 31
Thread Nominal Major Threads
Designation Size Diameter per
    mm inch
ET ET d=D tpi
ET 5/8 5/8 15.88 18
ET 3/4 3/4 19.05 16
ET 1 1 25.40 16
ET 1 1/4 1 1/4 31.75 16
ET 1 1/2 1 1/2 38.10 14
ET 2 2 50.80 14
ET 2 1/2 2 1/2 63.50 14
ET 3 3 76.20 14
filnam:ETthd.xls ver x2g
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