Thread

Drill Bit

Through-Hole

Threading

Closed-End

Hole Threading

Size Lg. Overall

Lg. Size Decimal Size

Equivalent Thread

Type Pitch

Dia. Limit No. of

Flutes Each No. of

Flutes Each

Chromium Carbide Cobalt Steel

2-56 5/16" 1 49/64" 51 ga. 0.067" UNC H2 2 2687A41 $22.70 3 2687A74 $42.20

4-40 5/16" 2 13/64" 43 ga. 0.089" UNC H2 2 2687A42 15.03 3 2687A75 27.72

5-40 5/16" 2 13/64" 38 ga. 0.1015" UNC H2 2 2687A43 15.03 3 2687A76 27.72

6-32 11/32" 2 13/64" 36 ga. 0.1065" UNC H3 2 2687A44 12.62 3 2687A77 22.03

8-32 7/16" 2 31/64" 29 ga. 0.136" UNC H3 2 2687A45 13.39 3 2687A78 22.03

10-24 15/32" 2 49/64" 25 ga. 0.1495" UNC H3 2 2687A46 12.62 3 2687A79 22.57

10-32 15/32" 2 49/64" 21 ga. 0.159" UNF H3 2 2687A47 12.62 3 2687A81 22.57

1/4"-20 19/32" 3 5/32" 7 ga. 0.201" UNC H3 2 2687A48 13.86 3 2687A82 24.90

1/4"-28 19/32" 3 5/32" 3 ga. 0.213" UNF H3 2 2687A49 13.86 __ ______ __

1/4"-28 19/32" 3 5/32" 3 ga. 0.213" UNF H4 __ ______ __ 3 2687A83 24.90

5/16"-18 19/32" 3 35/64" F 0.257" UNC H3 2 2687A51 15.45 3 2687A84 27.72

5/16"-24 19/32" 3 35/64" I 0.272" UNF H3 2 2687A71 19.21 __ ______ __

3/8"-16 3/4" 3 15/16" 5/16" 0.3125" UNC H3 2 2687A53 17.79 3 2687A86 30.89

7/16"-14 23/32" 3 15/16" U 0.368" UNC H3 3 2687A55 22.70 __ ______ __

7/16"-20 23/32" 3 15/16" 25/64" 0.3906" UNF H3 3 2687A73 28.19 __ ______ __

1/2"-13 29/32" 4 21/64" 27/64" 0.4219" UNC H4 3 2687A57 26.42 3 2687A91 54.92

1/2"-20 29/32" 4 21/64" 29/64" 0.4531" UNF H3 3 2687A58 26.42 __ ______ __

Titanium Carbonitride (TiCN) Coated Cobalt Steel

3/8"-24 3/4" 3 15/16" Q 0.332" UNF H4 3 2687A72 20.48 __ ______ __

Metric

Thread

Drill Bit

Through-Hole

Threading

Closed-End

Hole Threading

Size Pitch,

mm Lg. Overall

Lg. Size Decimal Size

Equivalent Pitch

Dia. Limit No. of

Flutes Each No. of

Flutes Each

Chromium Carbide Cobalt Steel

M3 0.5 5/16" 2 13/64" 2.5 mm 0.0984" D3 2 2673A71 $20.42 3 2673A21 $36.52

M3.5 0.6 11/32" 2 13/64" 2.9 mm 0.1142" D4 2 2673A72 18.33 __ ______ __

M4 0.7 7/16" 2 31/64" 3.3 mm 0.1299" D4 2 2673A73 18.33 3 2673A22 33.71

M5 0.8 15/32" 2 49/64" 4.2 mm 0.1654" D4 2 2673A74 18.33 3 2673A23 33.71

M6 1 15/32" 3 5/32" 5 mm 0.1968" D5 2 2673A75 18.33 3 2673A24 33.71

M7 1 19/32" 3 35/64" 6 mm 0.2362" D5 2 2673A76 20.42 __ ______ __

M8 1.25 19/32" 3 35/64" 6.7 mm 0.2638" D5 2 2673A78 20.42 __ ______ __

M10 1.25 23/32" 3 15/16" 8.7 mm 0.3425" D5 2 2673A79 28.61 __ ______ __

M10 1.5 23/32" 3 15/16" 8.5 mm 0.3346" D6 2 2673A81 30.35 3 2673A27 51.51

M12 1.25 27/32" 4 21/64" 10.8 mm 0.4251" D6 3 2673A82 33.99 __ ______ __

M12 1.5 27/32" 4 21/64" 10.5 mm 0.4133" D6 3 2673A83 33.99 3 2673A29 62.04

M12 1.75 27/32" 4 21/64" 10.2 mm 0.4016" D6 3 2673A84 33.99 3 2673A28 62.04