Stihl OILOMATIC - Guide Bar Selection and Types

37Chain and Bar Manual
4. Ematic Guide Bars
STIHL manufactures a full line of
guide bars to suit every STIHL
chainsaw and every cutting
application. STIHL guide bars with
the oil-saving STIHL Ematic system
(see 4.4) are marked with the letter
"E".
STIHL guide bars are available in a
wide range of lengths with groove
widths of .043" (1.1 mm) (Rollomatic
Mini), .050" (1.3 mm), .058"
(1.5 mm) and .063" (1.6 mm).
The contour of the various types of
guide bars has been optimized to
meet the requirements laid down
for:
– cutting capacity
– straight-line control
– kickback behavior
–resistance to wear
4.1 Criteria for Selection
Four different characteristics define
a guide bar:
Bar tail
The bar tail assigns the guide bar to
specific chainsaw models (power
classes).
Groove width
A continuous groove is machined in
the periphery of the bar. The tangs
of the drive links extend into the
groove to keep the chain running in
a straight line. The bar groove also
serves as a supply channel for
chain and bar lubricant. The chain
rides on the rails on either side of
the groove.
The groove width assigns the bar to
certain types of chain (drive link
gauge).
689RA190 KN
689RA191 KN
Nose sprocket
The pitch of the nose sprocket
assigns Rollomatic bars to certain
sprocket and chain pitches.
Cutting length
The length of the bar (a) determines
the area of application (e.g. log
diameter).
689RA192 KN
3/8
689RA193 KN
a