Thread rolling engineering standards - Semblex Corporation
Thread rolling engineering standards - Semblex Corporation
Thread rolling engineering standards - Semblex Corporation
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Pilot Hole Sizes<br />
MATERIAL<br />
THICKNESS<br />
Nominal<br />
Screw Size<br />
M2.5-0.45<br />
M3-0.5<br />
M3.5-0.6<br />
M4-0.7<br />
M4.5-0.75<br />
M5-0.8<br />
M6-1.0<br />
M7-1.0<br />
M8-1.25<br />
M10-1.5<br />
M12-1.75<br />
METRIC<br />
(mm)<br />
0.5-2.0 1.6-3.5 3.2-6.7 6.3-8.3 8.0-12.7<br />
Material Drill Size mm Drill Size mm Drill Size mm Drill Size mm Drill Size mm<br />
Steel 2.25mm 2.25 2.3mm 2.30 42 2.37<br />
Aluminum 2.25mm 2.25 2.3mm 2.30 2.35mm 2.35<br />
Steel 36 2.71 2.8mm 2.80 34 2.82<br />
Aluminum 36 2.71 7/64 2.78 2.8mm 2.80<br />
Steel 1/8 3.18 3.2mm 3.20 30 3.26 3.3mm 3.30<br />
Aluminum 1/8 3.18 3.2mm 3.20 3.2mm 3.20 30 3.26<br />
Steel 28 3.57 27 3.66 3.7mm 3.70 26 3.73<br />
Aluminum 28 3.57 27 3.66 3.7mm 3.70 3.7mm 3.70<br />
Steel 21 4.04 4.2mm 4.20 4.25mm 4.25<br />
Aluminum 21 4.04 4.1mm 4.10 4.2mm 4.20<br />
Steel 15 4.57 4.7mm 4.70 3/16 4.76<br />
Aluminum 15 4.57 15 4.57 4.7mm 4.70<br />
Steel 5.4mm 5.40 5.5mm 5.50 7/32 5.56 5.7mm 5.70<br />
Aluminum 5.4mm 5.40 3 5.41 5.5mm 5.50 7/32 5.56<br />
Steel 6.4mm 6.40 6.5mm 6.50 F 6.53 G 6.63<br />
Aluminum 6.4mm 6.40 6.4mm 6.40 6.5mm 6.50 F 6.53<br />
Steel 7.3mm 7.30 L 7.37 7.4mm 7.40 7.5mm 7.50<br />
Aluminum 7.3mm 7.30 L 7.37 7.4mm 7.40 7.4mm 7.40<br />
Steel 9.2mm 9.20 U 9.35 3/8 9.53<br />
Aluminum 23/64 9.13 9.2mm 9.20 U 9.35<br />
Steel 11.0mm 11.00 7/16 11.11<br />
Aluminum 11.0mm 11.00 11.0mm 11.00<br />
MATERIAL<br />
THICKNESS<br />
Nominal<br />
Screw Size<br />
#3-48<br />
#4-40<br />
#5-40<br />
#6-32<br />
#8-32<br />
#10-24<br />
#10-32<br />
#12-24<br />
1/4-20<br />
5/16-18<br />
3/8-16<br />
7/16-14<br />
1/2-13<br />
INCH .020-.078 .063-.140 .125-.266 .250-.328 .313-.500<br />
Material Drill Size Inch Drill Size Inch Drill Size Inch Drill Size Inch Drill Size Inch<br />
Steel 44 .086 43 .089 2.35mm .093<br />
Aluminum 44 .086 43 .089 2.31mm .091<br />
Steel 40 .098 38 .102 37 .104<br />
Aluminum 40 .098 39 .100 38 .102<br />
Steel 34 .111 33 .113 32 .116<br />
Aluminum 35 .110 34 .111 33 .113 33 .113<br />
Steel 31 .120 31 .120 1/8 .125 30 .128<br />
Aluminum 31 .120 31 .120 1/8 .125 1/8 .125<br />
Steel 27 .144 26 .147 25 .150 23 .154<br />
Aluminum 27 .144 26 .147 25 .150 24 .152<br />
Steel 19 .166 11/64 .172 16 .177<br />
Aluminum 19 .166 19 .166 18 .170<br />
Steel 17 .173 16 .177 15 .180<br />
Aluminum 17 .173 17 .173 16 .177<br />
Steel 4.9mm .193 8 .199 13/64 .203<br />
Aluminum 11 .191 9 .196 8 .199 13/64 .203<br />
Steel 7/32 .219 5.7mm .224 1 .228 A .234<br />
Aluminum 7/32 .219 2 .221 5.7mm .224 I .228<br />
Steel 9/32 .281 9/32 .281 7.25mm .285 L .290<br />
Aluminum 9/32 .281 9/32 .281 7.25mm .285 7.3mm .287<br />
Steel 11/32 .344 S .348 9.0mm .354<br />
Aluminum R .339 11/32 .344 S .348<br />
Steel Y .404 13/32 .406<br />
Aluminum X .397 10.2mm .402<br />
Steel 11.8mm .465 15/32 .469<br />
Aluminum 11.8mm .465 11.8mm .465<br />
4
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