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Irrigation Warehouse Group Pty Ltd

Throughout the web site we refer to the BSP fittings as being 1/2", 3/4" or 1", or 15mm, 20mm or 25mm however, while this is commonly how these fittings are described, it is not strictly accurate.   BSP fittings are named after the nominal internal diameter of the pipe and not the actual fitting size.   A 1" BSPT nipple has an outside diameter of 32.86mm, you measure the thread on the first full thread from the end of the fitting.   Below is the chart for the common sizes of BSP fittings that we sell.

BSPT & BSPP
SIZE & PITCH
DASH
SIZE
BSPT MALE
THREAD OD
BSPP MALE
THREAD OD
BSPT FEMALE
THREAD ID
BSPP FEMALE
THREAD ID
inch - TPI   mm inch mm inch mm inch mm inch
1/8 - 28 -02 9,5 0.37 9,6 0.38 8,4 0.33 8,6 0.34
1/4 - 19 -04 12,8 0.50 13,0 0.51 11,2 0.44 11,9 0.47
3/8 - 19 -06 16,3 0.64 16,5 0.65 14,7 0.59 15,2 0.60
1/2 - 14 -08 20,4 0.80 20,8 0.82 18,3 0.72 19,1 0.75
5/8 - 14 -10 22,5 0.89 22,8 0.90 20,6 0.81 20,8 0.82
3/4 - 14 -12 25,9 1.02 26,3 1.04 23,9 0.94 24,6 0.97
1 - 11 -16 32,6 1.28 33,1 1.30 29,7 1.17 30,7 1.21
1.1/4 - 11 -20 41,1 1.62 41,8 1.64 38,6 1.52 39,4 1.55
1.1/2 - 11 -24 47,0 1.85 47,7 1.88 44,5 1.75 45,5 1.79
2 -11 -32 58,6 2.31 59,5 2.34 56,4 2.22 57,4 2.26
2.1/2 - 11 -40 74,1 2.92 75,1 2.95 71,9 2.83 72,6 2.86
3 - 11 -48 86,6 3.41 87,9 3.46 84,6 3.33 85,4 3.36