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Currency - All prices are in AUD

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NPS Tap Drill Chart

National Pipe Thread Tap (NPS) Chart
 Tap Size  Drill Size
 1/8-27   S
 1/4-18  29/64
 3/8-18  19/32
 1/2-14  47/64
 3/4-14  15/16
 1"-11-1/2   1-3/16
 1-1/4-11-1/2  1-33/64
 1-1/2-11-1/2  1-3/4
 2"-11-1/2  2-7/32
 2-1/2-8  2-21/32
 3"-8  3-9/32
 3-1/2-8  3-25/32
 4"-8  4-9/32