Thread

Drill Bit

Through-Hole

Threading

Closed-End

Hole Threading

Size Lg. Overall

Lg. Size Decimal Size

Equivalent No. of

Flutes Thread

Type Pitch

Dia. Limit Each Each

Black Oxide Cobalt Steel

2-56 1/4" 1 3/4" 51 ga. 0.067" 2 UNC H2 ______ __ 2401A24 $64.77

4-40 13/32" 2 3/16" 43 ga. 0.089" 2 UNC H2 2439A12 $50.01 2401A28 50.01

5-40 13/32" 2 3/16" 38 ga. 0.1015" 2 UNC H2 2439A14 52.17 2401A31 52.17

6-32 15/32" 2 3/16" 36 ga. 0.1065" 3 UNC H2 2439A16 46.18 2401A33 46.18

6-40 15/32" 2 3/16" 33 ga. 0.113" 3 UNF H2 ______ __ 2401A34 47.33

8-32 1/2" 2 15/32" 29 ga. 0.136" 3 UNC H2 2439A18 44.65 2401A35 44.65

8-36 1/2" 2 15/32" 29 ga. 0.136" 3 UNF H2 ______ __ 2401A36 46.81

10-24 19/32" 2 3/4" 25 ga. 0.1495" 3 UNC H3 2439A21 44.65 2401A37 44.65

10-32 19/32" 2 3/4" 21 ga. 0.159" 3 UNF H3 2439A22 46.81 2401A38 46.81

12-28 5/8" 3 5/32" 15 ga. 0.18" 3 UNF H3 ______ __ 2401A41 47.33

1/4"-20 21/32" 3 5/32" 7 ga. 0.201" 3 UNC H3 2439A25 50.01 2401A42 50.01

1/4"-28 21/32" 3 5/32" 3 ga. 0.213" 3 UNF H3 2439A26 52.79 2401A43 52.79

5/16"-18 25/32" 3 17/32" F 0.257" 3 UNC H3 2439A27 55.73 2401A44 55.73

5/16"-24 25/32" 3 17/32" I 0.272" 3 UNF H3 2439A28 57.37 2401A45 57.37

3/8"-16 27/32" 3 15/16" 5/16" 0.3125" 3 UNC H4 2439A29 64.72 2401A46 63.49

3/8"-24 27/32" 3 15/16" Q 0.332" 3 UNF H3 2439A31 66.16 2401A47 66.16

7/16"-14 27/32" 3 15/16" U 0.368" 3 UNC H4 2439A32 89.81 2401A48 89.81

7/16"-20 27/32" 3 15/16" 25/64" 0.3906" 3 UNF H3 2439A33 92.61 2401A49 92.61

1/2"-13 31/32" 4 5/16" 27/64" 0.4219" 3 UNC H4 2439A34 90.72 2401A51 90.72

1/2"-20 27/32" 3 15/16" 29/64" 0.4531" 3 UNF H3 2439A35 94.91 2401A52 94.91

5/8"-11 11/16" 4 5/16" 17/32" 0.5313" 3 UNC H4 2439A38 144.90 ______ __

5/8"-18 27/32" 3 15/16" 37/64" 0.5781" 3 UNF H4 2439A39 150.36 ______ __

3/4"-10 13/16" 4 29/32" 21/32" 0.6563" 3 UNC H5 2439A41 190.84 ______ __

3/4"-16 31/32" 4 5/16" 11/16" 0.6875" 4 UNF H4 2439A42 198.21 ______ __