Thread Data

Metric

standard thread conforming to EN60423
Thread sizeExternal thread outside diameter(mm)Internal thread inside diameter(mm)Pitch
(mm)
M1212.010.41.5
M1616.014.41.5
M2020.018.41.5
M2525.023.41.5
M3232.030.41.5
M4040.038.41.5
M5050.048.41.5
M6363.061.41.5
M7575.073.41.5

PF / gas

Japanese conduit thread conforming to JIS B 0202
Thread sizeExternal thread outside diameter(mm)Internal thread inside diameter(mm)Pitch
(mm)
½21.018.61.81
¾26.424.11.81
133.330.32.31
1 ¼41.939.02.31
1 ½47.844.82.31
259.656.72.31

NPT

American taper pipe thread conforming to ANS/ASME B1.20.1 - 1983
Thread size
(inches)
External thread outside diameter
(mm)
Pitch
mm
3/816.71.14
½21.01.81
¾26.41.81
133.32.21
1 ¼41.92.21
1 ½47.82.21
259.62.21

PG

German standard thread conforming to DIN40430
Thread sizeExternal thread outside diameter(mm)Internal thread inside diameter(mm)Pitch
(mm)
PG712.511.31.27
PG915.213.91.41
PG1118.617.31.41
PG13.520.419.11.41
PG1622.521.21.41
PG2128.326.81.59
PG2937.035.51.59
PG3647.045.51.59
PG4254.052.51.59
PG4859.357.81.59

UNEF / UNS / UN

American unified thread conforming to BS1580 used on circular connectors
UNEF imperial sizesThread size
(inches)
External thread outside diameter
(mm)
Internal thread inside diameter
(mm)
Pitch
(mm)
245/815.9 14.71.06
20¾19.117.71.27
207/822.220.91.27
20125.424.01.27
181 3/1630.228.61.41
181 3/834.933.41.41
181 ¼31.830.21.41
181 7/1636.535.01.41
18 UNS1 ¾44.542.91.41
18 UNS250.849.31.41
18 UN2 ¼57.255.41.41

Cable carrying capacity

UK wiring regulations BS7671, recommend that the total cross sectional area of the sum of the individual cables should not exceed 40% of the cross sectional area of the conduit. The nominal cross sectional area of single-core, stranded, PVC insulated cables is provided as a guide only. Other cables may have different dimensions.
Nominal conductor sizeNominal overall cross sectional area (mm2)
1.06.6
1.57.6
2.59.6
4.014.5
6.018.8
10.029.3
16.040.2
25.063.8
35.083.5
50.0113.0
70.0149.0
95.0204.0

Example: is LTP20 suitable for five 4.0mm2 cables?

This is less than 40%; therefore this conduit is suitable for this combination of cables.

UK wiring regulations

UK wiring regulations BS7671 prohibit the use of flexible or pliable conduit as an earthing conductor.

Where conduits of 40mm and above penetrate fire barriers in buildings the wiring regulations stipulate that internal seals should be used to maintain fire resistance.

To meet the UK wiring regulations conduit should be self extinguishing unless they are to be buried or contained in non combustible material e.g: concrete or plaster.

Please telephone the Flexicon hotline for further guidance.

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