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[RP.AND DRILU CHRRm

METRIC BRITISH 6 NPT

METRIC ISO

Coarse 60 Thread Form BSW British Standard Whitworth

55

Thread Form

Tapping Drill Sizes Tapping Drill Sizes Pitch per Preferred

mm mm mm

inch

mm

inch

mm 1.6 0.35 1.25 3/64 1/16* 60 1.2 3/64 1.05 1.7 0.35 1.35 55 3/32* 48 1.9 49 1.75 1.8 0.35 1.45 54 1/8 40 2.55 2.5 3/32 2 0.40 1.60 1/16 5/32* 32 3.2 1/8 2.95 2.5 0.45 2.05 46 3/16 24 3.7 3.6 9/64 3 0.5 2.50 40 7/32* 24 4.5 4.3 11/64 3.5 0.60 2.90 33 1/4 20 5.1 5.0 3/16 4 0.70 3.30 30 5/16 18 6.5 6.4 1/4 4.5 0.75 3.70 27 3/8 16 7.9 5/16 7.8 19/64 7/16 14 9.5 9.2 23/64 5 0.80 4.30 11/64 4.20 19 1/2 12 10.5 13/32 6 1.0 5.1 13/64 5.0 9 9/16 12 12.0 15/32 7 1.0 6.1 6.0 15/64 5/8 11 13.5 33/64 8 1.25 6.9

H

6.8 17/64 3/4 10 16.5 16.0 5/8 9 1.25 7.9 5/16 7.8 7/8 9 19.0 47/64 10 1.5 8.6 11/32 8.5 Q 1 8 22.0 27/32 11 1.5 9.5 3/8 1-1/8 7 61/64 12 1.75 13/32 10.2

y

1-1/4 7 1-5/64 14 2.0 12.2 31/64 12.0 15/32 1-1/2 6 1-19/64 16 2.0 14.25 9/16 14.0 35/64 1-3/4 5 1-33/64 18 2.5 15.75 15.5 39/64 2 4-1/2 1-3/4 20 2.5 45/64 17.5 11/16 22 2.5 25/32 19.5 49/64 24 3.0 21.0 53/64

per Preferred

27 3.0 24.0 61/64 15/16

inch

mm

inch

mm 30 3.5 26.5 1-3/64 32 4.0 5/32 3.9 33 3.5 1-11/64 29.50 26 5.3 5.2 36 4.0 1-17/64 32.00 22 6.8 17/64 6.7 39 4.0 1-3/8 20 8.3 21/64 8.2 5/16 18 9.5 3/8 16 7/16 11.0 27/64 16 1/2 12.5 31/64

Pitch

14 14.0 35/64 13.8 17/32 mm mm mm 12 16.5 21/32 4 0.50 3.5 29 9/64 11 19.5 49/64 5 0.50 4.5 16 10 22.5 7/8 6 0.75 5.25 5 9 1-7/64 7 0.75 6.25 D 6.2 1/4 8 1-11/32 8 1.00 7.0 J 7.1 9/32 7 1-37/64 10 1.25 8.75 11/32

s

10 1.00 9.0

T

23/64 12 1.50 10.5 27/64

z

per

12 1.25 10.75 27/64

inch

mm mm 12 1.00 11.0 7/16 1/16 27 D 6.3 1/4 14 1.5 12.50 31/64 1/2 1/8 27

R

8.7 11/32 16 1.5 14.75 37/64 14.5 9/16 1/4 18 7/16 11.1 18 2.0 16.0 5/8 3/8 18 9/16 14.5 1/2 14 23/32 18.0 18 1.5 16.5 21/32 16.5 3/4 14 59/64 23.25 20 2.0 18.0 45/64 1 11-1/2 1-5/32 29.0 20 1.5 18.5 47/64 1-1/4 11-1/2 1-1/2 38.0 22 2.0 20.0 25/32 1-1/2 11-1/2 1-47/64 44.0 22 1.5 20.5 13/16 20.5 2 11-1/2 2-7/32 56.0 24 2.0 22.0 7/8 2-1/2 8 2-5/8 67.0 24 1.5 22.5 7/8 3 8 3-1/4 82.5