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Tapping & Clearance Drill Tables

BA Standard Threads

Metric Threads

Unified Coarse (UNC) Threads

Unified Fine (UNF) Threads

 

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BA Standard Threads

B.A.
O.Dia
Tap Drill
Clearance
0
0.2362"
5.10mm
6.10mm
1
0.2087"
4.50mm
5.40mm
2
0.1850"
4.00mm
4.80mm
3
0.1614"
3.45mm
4.20mm
4
0.1417"
3.00mm
3.70mm
5
0.1260"
2.65mm
3.30mm
6
0.1102"
2.30mm
2.85mm
7
0.0984"
2.05mm
2.55mm
8
0.0866"
1.80mm
2.25mm
9
0.0784"
1.55mm
1.95mm
10
0.0669"
1.40mm
1.80mm
11
0.0591"
1.20mm
1.60mm
12
0.0511"
1.05mm
1.40mm

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ISO Metric Coarse Threads

O. Dia
Tap Drill
Clearance
1.0mm
0.75mm
1.05mm
1.1mm
0.85mm
1.15mm
1.2mm
0.95mm
1.30mm
1.4mm
1.10mm
1.50mm
1.6mm
1.25mm
1.70mm
1.8mm
1.45mm
1.90mm
2.0mm
1.60mm
2.05mm
2.2mm
1.75mm
2.25mm
2.5mm
2.05mm
2.60mm
3.0mm
2.50mm
3.10mm
3.5mm
2.90mm
3.60mm
4.0mm
3.30mm
4.10mm
4.5mm
3.80mm
4.60mm
5.0mm
4.20mm
5.10mm
6.0mm
5.00mm
6.10mm
7.0mm
6.00mm
7.20mm
8.0mm
6.80mm
8.20mm
10.0mm
8.50mm
10.20mm
12.0mm
10.20mm
12.20mm
14.0mm
12.00mm
14.25mm
16.0mm
14.00mm
16.25mm
18.0mm
15.50mm
18.25mm
20.0mm
17.50mm
20.25mm

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Unified Coarse (UNC)

Size
O.Dia
Tap Drill
Clearance
1-64
1.854mm
1.6mm
2.06mm
2-56
2.184mm
1.8mm
2.44mm
3-48
2.515mm
2.1mm
2.79mm
4-40
2.845mm
2.3mm
3.26mm
5-40
3.175mm
2.65mm
3.45mm
6-32
3.505mm
2.8mm
3.80mm
8-32
4.166mm
3.5mm
4.50mm
10-24
4.826mm
3.9mm
5.10mm
12-24
5.486mm
4.5mm
5.80mm
1/4-20
6.350mm
5.2mm
6.76mm

N.B. Discrepancies that exist within tables of UNC dimensions are mainly due to manufacturers
publishing their production values, which are not necessarily the official SAE/ANSI values

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Unified Fine(UNF)

Size
O.Dia
Tap Drill
Clearance
0-80
1.524mm
1.4mm
1.78mm
1-72
1.854mm
1.7mm
2.06mm
2-64
2.184mm
2.0mm
2.44mm
3-56
2.515mm
2.3mm
2.79mm
4-48
2.845mm
2.6mm
3.26mm
5-44
3.175mm
2.9mm
3.45mm
6-40
3.505mm
3.0mm
3.80mm
8-36
4.166mm
3.5mm
4.50mm
10-32
4.826mm
4.1mm
5.10mm
12-28
5.486mm
4.7mm
5.80mm
1/4-28
6.350mm
5.5mm
6.76mm

N.B. Discrepancies that exist within tables of UNC dimensions are mainly due to manufacturers
publishing their production values, which are not necessarily the official SAE/ANSI values

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