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holes_thread_shaft.md

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Mechanical Cheat Sheet

Holes, Threads and Shaft

Table of contents

Metric Threads

Screw Size (mm) Thread Pitch (mm) Drill Size (mm)
M1.5 0.35 1.15
M1.6 0.35 1.25
M1.8 0.35 1.45
M2 0.4 1.6
M2.2 0.45 1.75
M2.5 0.45 2.05
M3 0.5 2.5
M3.5 0.6 2.9
M4 0.7 3.3
M4.5 0.75 3.75
M5 0.8 4.2
M5.5 0.9 4.6
M6 1 5
M7 1 6
M8 1.25 6.8
M9 1.25 7.8
M10 1.5 8.5
M11 1.5 9.5
M12 1.75 10.3
M14 2 12.1
M18 2.5 15.5
M19 2.5 16.5
M20 2.5 17.5

Clearance Drill

Screw Size (mm) Close Fit Drill Size (mm) Standard Fit Drill Size (mm)
M1.5 1.6 1.65
M1.6 1.7 1.75
M1.8 1.9 2.0
M2 2.1 2.2
M2.2 2.3 2.4
M2.5 2.65 2.75
M3 3.15 3.3
M3.5 3.7 3.85
M4 4.2 4.4
M4.5 4.75 5
M5 5.25 5.5
M5.5 5.8 6.1
M6 6.3 6.6
M7 7.4 7.7
M8 8.4 8.8
M9 9.5 9.9
M10 10.5 11
M11 11.6 12.1
M12 12.6 13.2
M14 14.75 15.5
M18 19 20
M19 20 21
M20 21 22

Drill Speed

Drill speed per material

Diameter (mm) Softwood Hardwood Steel (tough) Steel (mild) Aluminum Brass Stainless Steel Copper/Bronzes
1 20690 15916 4775 7958 23873 12732 7958 9549
2 10345 7958 2387 3979 11937 6366 3979 4775
3 6897 5305 1592 2653 7958 4244 2653 3183
4 5173 3979 1194 1989 5968 3183 1989 2387
5 4138 3183 955 1592 4775 2546 1592 1910
6 3448 2653 796 1326 3979 2122 1326 1592
7 2956 2274 682 1137 3410 1819 1137 1364
8 2586 1989 597 995 2984 1592 995 1194
9 2299 1768 531 884 2653 1415 884 1061
10 2069 1592 477 796 2387 1273 796 955
12 1724 1326 398 663 1989 1061 663 796
14 1478 1137 341 568 1705 909 568 682
18 1149 884 265 442 1326 707 442 531
20 1035 796 239 398 1194 637 398 477

unit : rotation/min

Common Cutting Speed

Material Cutting speed (m/min)
Softwood 65
Hardwood 50
Steel (tough) 15
Steel (mild) 25
Aluminum 75
Brass 40
Stainless Steel 25
Copper/Bronzes 30

Formula

n = 1000 * Vc / ( pi * d )

Where:
n = Rotational Speed of the Main Spindle (rotation/min)
Vc = Cutting speed, depends on material, see table bellow (m/min)
d = drill diameter (mm)\

Shaft and Hole Tolerances

Table of ISO tolerances of most common classes for 6 to 10mm shafts/holes

Hole class Hole
min / max		 Shaft
min / max		 Shaft class
F7 0.0130 / 0.0280 -0.0280 / -0.0130 f7
F6 0.0130 / 0.0220 -0.0220 / -0.0130 f6
G7 0.0050 / 0.0200 -0.0200 / -0.0050 g7
G6 0.0050 / 0.0140 -0.0140 / -0.0050 g6
H7 0.0000 / 0.0150 -0.0150 / 0.0000 h7
H6 0.0000 / 0.0090 -0.0090 / 0.0000 h6
H5 0.0000 / 0.0060 -0.0060 / 0.0000 h5

More here : http://theoreticalmachinist.com/IsoTolZoneCalc

Sources