Formdrill Tool Selection Chart

Thread Size

Tool Diameter (mm.)

Formdrill Tool Style  Selection

Tool style selection based on material thickness: S=Short, SF=Short/Flat, L=Long and LF=Long/Flat

METRIC

 STEEL STAINLESS 1.0 mm. 2.0 mm. 3.0 mm. 4.0 mm. 5.0 mm. 6.0 mm. 7.0 mm. 8.0 mm.

M3X0.5

 2.7 2.7 S - SF L - SF L - LF

M4X0.7

 3.7 3.7 S - SF L - SF L - LF LF

M5X0.8

 4.5  4.6 S - SF S - SF L - LF LF

M6X1.0

 5.3 5.4 S - SF S - SF L - LF LF

M8X1.25

 7.3 7.4 S - SF S - SF L - SF L - LF LF LF

M10X1.5

 9.2 9.3 S - SF S - SF S - SF L - SF L - LF LF

M12X1.75

 10.9 10.9 S - SF S - SF S - SF L - SF L - LF L - LF LF

M14X2.0

 13.0 13.0 S - SF S - SF S - SF L - SF L - LF L - LF LF

M16X2.0

 14.8 14.8 S - SF S - SF S - SF L - SF L - LF L - LF LF

M18X2.5

 16.7 16.7 S - SF S - SF S - SF L - SF L - LF L - LF L - LF LF

M20X2.5

 18.7 18.7 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

BSP

1/8BSP

 9.2 9.2 S - SF S - SF S - SF L - SF L - LF LF

1/4 BSP

 12.4 12.4 S - SF S - SF S - SF L - SF L - LF L - LF LF

3/8 BSP

 15.9 15.9 S - SF S - SF S - SF L - SF L - LF L - LF L - LF LF

1/2 BSP

 19.9 19.9 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

3/4 BSP

 25.4 25.4 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

1/1 BSP

 31.9 31.9 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

UNC

N°5 UNC (40)

 2.9 2.9 S - SF L - SF L - LF

N°6 UNC (32)

 3.1 3.1 S - SF L - SF L - LF LF

N°8 UNC (32)

 3.8 3.8 S - SF L - SF L - LF LF

N°10 UNC (24)

 4.3 4.3 S - SF S - SF L - LF LF

N°12 UNC (24)

 4.9 4.9 S - SF S - SF L - LF LF

1/4 UNC (20)

 5.7 5.7 S - SF S - SF L - LF LF

5/16 UNC (18)

 7.2 7.2 S - SF S - SF L - SF L - LF LF LF

3/8 UNC (16)

 8.7 8.7 S - SF S - SF S - SF L - SF LF LF

7/16 UNC (14)

 10.2 10.2 S - SF S - SF S - SF L - SF L - LF L - LF LF

1/2 UNC (13)

 11.7 11.7 S - SF S - SF S - SF L - SF L - LF L - LF LF

9/16 UNC (12)

 13.2 13.2 S - SF S - SF S - SF L - SF L - LF L - LF LF

5/8 UNC (11)

 14.7 14.7 S - SF S - SF S - SF L - SF L - LF L - LF LF

3/4 UNC (10)

 17.8 17.8 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

METRIC-FINE

M6X0.75

 5.6 5.6 S - SF S - SF L - LF LF

M6X0.5

 5.8 5.8 S - SF S - SF L - LF LF

M8X1.0

 7.5 7.5 S - SF S - SF L - SF L - LF LF LF

M8X0.75

 7.6 7.6 S - SF S - SF L - SF L - LF LF LF

M10X1.25

 9.3 9.3 S - SF S - SF S - SF L - SF L - LF LF

M10X1.0

 9.5 9.5 S - SF S - SF S - SF L - SF L - LF LF

M12X1.5

 11.2 11.2 S - SF S - SF S - SF L - SF L - LF L - LF LF

M12X1.0

 11.5 11.5 S - SF S - SF S - SF L - SF L - LF L - LF LF

M16X1.5

 15.2 15.2 S - SF S - SF S - SF L - SF L - LF L - LF L - LF LF

M16X1.0

 15.5 15.5 S - SF S - SF S - SF L - SF L - LF L - LF L - LF LF

M18X1.5

 17.2 17.2 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

UNF

N°5 UNF (44)

 2.9 2.9 S - SF L - SF L - LF

N°6 UNF (40)

 3.2 3.2 S - SF L - SF L - LF LF

N°8 UNF (36)

 3.9 3.9 S - SF L - SF L - LF LF

N°10 UNF (32)

 4.4 4.4 S - SF S - SF L - LF LF

N°12 UNF (28)

 5.0 5.0 S - SF S - SF L - LF LF

1/4 UNF (28)

 5.9 5.9 S - SF S - SF L - LF LF

5/16 UNF (24)

 7.4 7.4 S - SF S - SF L - SF L - LF LF LF

3/8 UNF (24)

 9.0 9.0 S - SF S - SF S - SF L - SF L - LF LF

7/16 UNF (20)

 10.4 10.4 S - SF S - SF S - SF L - SF L - LF L - LF LF

1/2 UNF (20)

 12.1 12.1 S - SF S - SF S - SF L - SF L - LF L - LF LF

9/16 UNF (18)

 13.6 13.6 S - SF S - SF S - SF L - SF L - LF L - LF LF

5/8 UNF (18)

 15.2 15.2 S - SF S - SF S - SF L - SF L - LF L - LF L - LF LF

3/4 UNF (16)

 18.3 18.3 S - SF S - SF S - SF S - SF L - SF L - LF L - LF L - LF

NPT

1/8NPT

1/4NPT

3/8NPT

1/2NPT

3/4NPT

1/1NPT