M2 clearance, close
A 2.2 mm hole, for an M2 bolt to pass through.
Diameter2.2 mm
ISO 273 clearance holes
Hardware sizes
62 holes at the size the hardware actually is: bolt clearances, nut pockets, bearing seats, motor and board patterns, panel cutouts. Every figure is a published standard and says which one.
These are drawn sizes, not cut sizes
A hole cut on its line comes out larger than drawn, because the beam takes material from both sides. The parts library subtracts your measured kerf so the cut lands on the figure. Cutting one of these at its nominal size gives you a bearing that falls out.
Screws and nuts
26M2 clearance, normal
A 2.4 mm hole, for an M2 bolt to pass through.
Diameter2.4 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M2 clearance, loose
A 2.6 mm hole, for an M2 bolt to pass through.
Diameter2.6 mm
ISO 273 clearance holes
M2.5 clearance, close
A 2.7 mm hole, for an M2.5 bolt to pass through.
Diameter2.7 mm
ISO 273 clearance holes
M2.5 clearance, normal
A 2.9 mm hole, for an M2.5 bolt to pass through.
Diameter2.9 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M2.5 clearance, loose
A 3.1 mm hole, for an M2.5 bolt to pass through.
Diameter3.1 mm
ISO 273 clearance holes
M3 clearance, close
A 3.2 mm hole, for an M3 bolt to pass through.
Diameter3.2 mm
ISO 273 clearance holes
M3 clearance, normal
A 3.4 mm hole, for an M3 bolt to pass through.
Diameter3.4 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M3 clearance, loose
A 3.6 mm hole, for an M3 bolt to pass through.
Diameter3.6 mm
ISO 273 clearance holes
M4 clearance, close
A 4.3 mm hole, for an M4 bolt to pass through.
Diameter4.3 mm
ISO 273 clearance holes
M4 clearance, normal
A 4.5 mm hole, for an M4 bolt to pass through.
Diameter4.5 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M4 clearance, loose
A 4.8 mm hole, for an M4 bolt to pass through.
Diameter4.8 mm
ISO 273 clearance holes
M5 clearance, close
A 5.3 mm hole, for an M5 bolt to pass through.
Diameter5.3 mm
ISO 273 clearance holes
M5 clearance, normal
A 5.5 mm hole, for an M5 bolt to pass through.
Diameter5.5 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M5 clearance, loose
A 5.8 mm hole, for an M5 bolt to pass through.
Diameter5.8 mm
ISO 273 clearance holes
M6 clearance, close
A 6.4 mm hole, for an M6 bolt to pass through.
Diameter6.4 mm
ISO 273 clearance holes
M6 clearance, normal
A 6.6 mm hole, for an M6 bolt to pass through.
Diameter6.6 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M6 clearance, loose
A 7 mm hole, for an M6 bolt to pass through.
Diameter7 mm
ISO 273 clearance holes
M8 clearance, close
A 8.4 mm hole, for an M8 bolt to pass through.
Diameter8.4 mm
ISO 273 clearance holes
M8 clearance, normal
A 9 mm hole, for an M8 bolt to pass through.
Diameter9 mm
The one to use unless you have a reason.
ISO 273 clearance holes
M8 clearance, loose
A 10 mm hole, for an M8 bolt to pass through.
Diameter10 mm
ISO 273 clearance holes
M3 nut pocket
A hexagon 5.5 mm across the flats, for an M3 nut to sit in.
Across the flats5.5 mm
The nut is 2.4 mm thick, so the material has to be at least that, or the pocket has to go all the way through.
DIN 934 hex nut, across flats
M4 nut pocket
A hexagon 7 mm across the flats, for an M4 nut to sit in.
Across the flats7 mm
The nut is 3.2 mm thick, so the material has to be at least that, or the pocket has to go all the way through.
DIN 934 hex nut, across flats
M5 nut pocket
A hexagon 8 mm across the flats, for an M5 nut to sit in.
Across the flats8 mm
The nut is 4.7 mm thick, so the material has to be at least that, or the pocket has to go all the way through.
DIN 934 hex nut, across flats
M6 nut pocket
A hexagon 10 mm across the flats, for an M6 nut to sit in.
Across the flats10 mm
The nut is 5.2 mm thick, so the material has to be at least that, or the pocket has to go all the way through.
DIN 934 hex nut, across flats
M8 nut pocket
A hexagon 13 mm across the flats, for an M8 nut to sit in.
Across the flats13 mm
The nut is 6.8 mm thick, so the material has to be at least that, or the pocket has to go all the way through.
DIN 934 hex nut, across flats
Bearings
9623 bearing seat
A 10 mm pocket, for a 623 bearing (3 mm bore, 4 mm wide).
Diameter10 mm
Metric deep groove ball bearing series
624 bearing seat
A 13 mm pocket, for a 624 bearing (4 mm bore, 5 mm wide).
Diameter13 mm
Metric deep groove ball bearing series
625 bearing seat
A 16 mm pocket, for a 625 bearing (5 mm bore, 5 mm wide).
Diameter16 mm
Metric deep groove ball bearing series
626 bearing seat
A 19 mm pocket, for a 626 bearing (6 mm bore, 6 mm wide).
Diameter19 mm
Metric deep groove ball bearing series
608 bearing seat
A 22 mm pocket, for a 608 bearing (8 mm bore, 7 mm wide).
Diameter22 mm
The skateboard bearing. The one most maker projects use, and the one most likely to be in a drawer already.
Metric deep groove ball bearing series
688 bearing seat
A 16 mm pocket, for a 688 bearing (8 mm bore, 5 mm wide).
Diameter16 mm
Metric deep groove ball bearing series
6000 bearing seat
A 26 mm pocket, for a 6000 bearing (10 mm bore, 8 mm wide).
Diameter26 mm
Metric deep groove ball bearing series
6001 bearing seat
A 28 mm pocket, for a 6001 bearing (12 mm bore, 8 mm wide).
Diameter28 mm
Metric deep groove ball bearing series
6002 bearing seat
A 32 mm pocket, for a 6002 bearing (15 mm bore, 9 mm wide).
Diameter32 mm
Metric deep groove ball bearing series
Motors
6NEMA 8 mount
Four M2 holes 16 mm apart with a 15 mm bore, for a NEMA 8 motor.
Hole spacing16 mm square
Hole2.4 mm
Centre bore15 mm
Body20.3 mm square
The body is 20.3 mm square, so leave that much room around it.
NEMA ICS 16 frame sizes
NEMA 11 mount
Four M2.5 holes 23 mm apart with a 22 mm bore, for a NEMA 11 motor.
Hole spacing23 mm square
Hole2.9 mm
Centre bore22 mm
Body28.2 mm square
The body is 28.2 mm square, so leave that much room around it.
NEMA ICS 16 frame sizes
NEMA 14 mount
Four M3 holes 26 mm apart with a 22 mm bore, for a NEMA 14 motor.
Hole spacing26 mm square
Hole3.4 mm
Centre bore22 mm
Body35.2 mm square
The body is 35.2 mm square, so leave that much room around it.
NEMA ICS 16 frame sizes
NEMA 17 mount
Four M3 holes 31 mm apart with a 22 mm bore, for a NEMA 17 motor.
Hole spacing31 mm square
Hole3.4 mm
Centre bore22 mm
Body42.3 mm square
The body is 42.3 mm square, so leave that much room around it.
NEMA ICS 16 frame sizes
NEMA 23 mount
Four M5 holes 47.14 mm apart with a 38.1 mm bore, for a NEMA 23 motor.
Hole spacing47.14 mm square
Hole5.5 mm
Centre bore38.1 mm
Body56.4 mm square
The body is 56.4 mm square, so leave that much room around it.
NEMA ICS 16 frame sizes
NEMA 34 mount
Four M6 holes 69.6 mm apart with a 73 mm bore, for a NEMA 34 motor.
Hole spacing69.6 mm square
Hole6.6 mm
Centre bore73 mm
Body86 mm square
The body is 86 mm square, so leave that much room around it.
NEMA ICS 16 frame sizes
Boards
5Raspberry Pi 4 mounting holes
Holes 58 by 49 mm apart, 2.75 mm across, for M2.5 standoffs.
Hole spacing58 by 49 mm
Hole2.75 mm
Raspberry Pi 4 published mechanical drawing
Raspberry Pi 3 mounting holes
Holes 58 by 49 mm apart, 2.75 mm across, for M2.5 standoffs.
Hole spacing58 by 49 mm
Hole2.75 mm
Raspberry Pi 3 published mechanical drawing
Raspberry Pi Zero mounting holes
Holes 58 by 23 mm apart, 2.75 mm across, for M2.5 standoffs.
Hole spacing58 by 23 mm
Hole2.75 mm
Raspberry Pi Zero published mechanical drawing
Arduino Uno mounting holes
Holes 66.04 by 48.26 mm apart, 3.2 mm across, for M3 standoffs.
Hole spacing66.04 by 48.26 mm
Hole3.2 mm
The Uno pattern is not a rectangle: two of its holes are offset. This is the rectangle that fits the four usable ones.
Arduino Uno published mechanical drawing
Arduino Nano mounting holes
Holes 43.18 by 15.24 mm apart, 1.8 mm across, for M2 standoffs.
Hole spacing43.18 by 15.24 mm
Hole1.8 mm
Arduino Nano published mechanical drawing
Panel
11LED, 3 mm
A 3.1 mm hole for a 3 mm LED.
Diameter3.1 mm
Common component size
LED, 5 mm
A 5.1 mm hole for a 5 mm LED.
Diameter5.1 mm
Common component size
Potentiometer, 7 mm
A 7.2 mm hole for a standard 6 mm shaft potentiometer bush.
Diameter7.2 mm
Alpha 9 mm and 16 mm pot bush
Pushbutton, 12 mm
A 12.2 mm hole for a 12 mm panel button.
Diameter12.2 mm
Panel button nominal size
Pushbutton, 16 mm
A 16.2 mm hole for a 16 mm panel button.
Diameter16.2 mm
Panel button nominal size
Pushbutton, 19 mm
A 19.2 mm hole for a 19 mm panel button.
Diameter19.2 mm
Panel button nominal size
Pushbutton, 22 mm
A 22.2 mm hole for a 22 mm panel button.
Diameter22.2 mm
Panel button nominal size
Rocker switch, KCD1
A 19.2 by 13.2 mm slot for the common small rocker.
Opening19.2 by 13.2 mm
There are several sizes sold as KCD1. Measure the one in your hand.
KCD1 rocker, 19 by 13 mm panel cutout
USB A socket
A 13.5 by 6 mm slot for a type A socket to pass through.
Opening13.5 by 6 mm
USB type A connector body
RJ45 socket
A 16 by 14 mm opening for an ethernet socket.
Opening16 by 14 mm
RJ45 panel jack body
IEC C14 inlet
A 27.5 by 19.5 mm opening for a kettle-lead inlet.
Opening27.5 by 19.5 mm
Snap-in inlets need the panel to be within the thickness the part is rated for. Check the part.
IEC 60320 C14 snap-in inlet
Fans
540 mm fan
A 37 mm opening with four M4 holes 32 mm apart.
Hole spacing32 mm square
Hole4.5 mm
Centre bore37 mm
Body40 mm square
Standard axial fan frame sizes
60 mm fan
A 57 mm opening with four M4 holes 50 mm apart.
Hole spacing50 mm square
Hole4.5 mm
Centre bore57 mm
Body60 mm square
Standard axial fan frame sizes
80 mm fan
A 77 mm opening with four M4 holes 71.5 mm apart.
Hole spacing71.5 mm square
Hole4.5 mm
Centre bore77 mm
Body80 mm square
The opening is deliberately smaller than the fan, so the frame has something to sit on.
Standard axial fan frame sizes
92 mm fan
A 89 mm opening with four M4 holes 82.5 mm apart.
Hole spacing82.5 mm square
Hole4.5 mm
Centre bore89 mm
Body92 mm square
Standard axial fan frame sizes
120 mm fan
A 117 mm opening with four M4 holes 105 mm apart.
Hole spacing105 mm square
Hole4.5 mm
Centre bore117 mm
Body120 mm square
The opening is deliberately smaller than the fan, so the frame has something to sit on.
Standard axial fan frame sizes
Nothing by that name.