14 Chain and Bar Manual
3.4 Criteria for Selection
The following characteristics define
a saw chain:
– Chain pitch
–Drive link gauge
–Chain length
–Shape of cutter (profile)
3.5 Chain Pitch
The pitch is determined by
measuring the distance from the
center of one rivet to the center of
the next but one and dividing the
measurement by two. The result is
the pitch in inches or millimeters.
The chain pitch is generally quoted
in inches (e.g. 3/8" = 9.32 mm).
It is necessary to measure across
three rivets because the rivet center
distances may be different on drive
links and cutters or tie straps.
The pitch size (a) is marked on each
cutter in the area of the depth
gauge.
Chain Pitch Designation
1/4" 1/4 or 1
.325" .325 or 2
3/8" 3/8 or 3
.404" .404 or 4
3/8" P P, PM or 6
1/4" P 7
3.6 Drive Link Gauge
The drive link gauge is the
measurement which allocates the
saw chain to particular guide bars
(groove width). It must match the
groove width of the guide bar so that
the chain fits the bar exactly. The
drive link gauge is quoted in
millimeters.
The last digit (arrow) of this
measurement is stamped on every
drive link (e.g. 6 = 1.6 mm).
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