|
| |
More technical information is available at
www.metricscrew-toolco.com .
| The thread pitches for metric coarse threads are
standardized like any other dimension on a metric fastener. Therefore,
there is no need to indicate or mention the pitch, it is assumed to be a
coarse thread. Due to the various pitches possible in fine
thread, the pitch always need to be mentioned.
In metric the pitch is the distance between the crest of one thread to
the crest of the next. The pitch is also referred to as the
distance a screw is thrusted after one revolution. The measurement is
always expressed in millimeters. Metric threads have a larger root
radius, makes them more resistant to fatigue than inch threads.
|
THREAD PITCH CHART
|
Thread Size |
Standard Pitch |
| M 2 |
0.4 mm |
| M 2.5 |
0.45 mm |
| M 3 |
0.5 mm |
| M 4 |
0.7 mm |
| M 5 |
0.8 mm |
| M 6 |
1.0 mm |
| M 8 |
1.25mm |
| M 10 |
1.5 mm |
A simple way to figure out a tap
drill size
| You can easily learn the fundamental
method to find the correct drill size for your metric tap!! Simply
subtract the pitch of the tap from the diameter of the tap. For
example: a M5x0.8mm needs a 4.2mm drill, and a M10x1.5mm needs an 8.5mm drill. |
DIMENSIONAL INFORMATION ON TRUSS HEAD
MACHINE SCREWS
|
Thread Diameter |
Head Outside Diameter |
Head Height |
|
M 3 |
6.9mm +0/-0.5mm |
1.9mm +/- 0.15mm |
|
M 4 |
9.4mm +0/-0.5mm |
2.5mm +/- 0.15mm |
|
M 5 |
11.8mm +0/-0.6mm |
3.1mm +/-0.15mm |
|
M 6 |
14.0mm +0/-0.7mm |
3.7mm +/-0.20mm |
|
