Technical Information · issue 3 of 2008
New Saw Chains STIHL 3/8" RAPID™ Micro™ Comfort; New Saw Chain STIHL 1/4" RAPID™ Micro™ Comfort; New Saw Chain STIHL 1/4" RAPID™ Micro™ Special
IssueTI 3/2008
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STIH)
Technical Information 03.2008
New Saw Chains STIHL 3/8" RAPID™ Micro™ Comfort – Series 3650, 3651, 3652
New Saw Chain STIHL 1/4" RAPID™ Micro™ Comfort – Series 3660
New Saw Chain STIHL 1/4" RAPID™ Micro™ Special – Series 3661
Contents
1. 3/8" RAPID™ Micro™ Comfort
2. 1/4" RAPID™ Micro™ Comfort and 1/4" RAPID™ Micro™ Special
3. Saw chain types
4. Spare parts
1. 3/8" RAPID™ Micro™ Comfort
The new 3/8" RAPID™ Micro™ C (3/8" RMC) low- 1.1 Advantages
vibration semi-chisel saw chain replaces the
. Reduced vibration
previous 3/8" RAPID™ Micro™ (3/8" RM) semi-
chisel saw chain. . Smooth running
The new saw chain is characterized by low . Good control
vibration, smooth cutting, good control and high . High cutting performance
cutting performance.
. Reduced feed effort
Like the previous 3/8" RAPID™ Micro™ (RM) saw
chain, the 3/8" RAPID™ Micro™ C can be used for 1.2 Vibration
all cutting applications for which 3/8" saw chains are The method of reducing the vibration level while
designed. maintaining high cutting performance is the same as
The new saw chains are available with drive link used in the 3/8" RSC saw chain.
gauges of 0.050 in., 0.058 in. and 0.063 in (1.3 mm,
1.5 mm and 1.6 mm).
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Page 2 Technical Information 03.2008
1.3 3/8" RAPID™ Micro™ Comfort features 1.5.2 Replacing tie straps
The previous tie straps (without bevelled heel) are
used when replacing the tie straps between cutters
2 1 (preset tie strap with rivet 3724 660 6600 and tie
strap without rivet 3718 662 1200).
1.6 Cutting rolls of chain to length
Tie straps (without bevelled heel) are enclosed with
the rolls of saw chain. The tie straps between cutters
have no influence on the vibration-reducing function
689TI130 KN
of the saw chain.
2. 1/4" RAPID™ Micro™ Comfort and
. The letter "C" is featured on each cutter (1) and 1/4" RAPID™ Micro™ Special
an arrow head in each tie strap (2). The arrow
indicates the direction of the running saw chain. The previous 1/4" RAPID™ Micro™ saw chain is
being replaced by the new, low-vibration 1/4"
1.4 Sharpening the saw chain RAPID™ Micro™ Comfort and the new 1/4" RAPID™
Depth gauge and cutting edges (side and top plate) Micro™ Special "carving saw chain".
of the new cutters are identical with the cutters on
the RAPID™ Micro™ saw chain. 2.1 Vibration
The method of reducing the vibration level while
The new 3/8" RAPID™ Micro™ Comfort saw chain is
maintaining high cutting performance is the same as
serviced and sharpened identical to the
used in the 3/8" RSC and 3/8" RMC saw chain.
3/8" RAPID™ Micro™ saw chain.
Sharpening angle 30° 2.2 1/4" RAPID™ Micro™ Comfort
Side plate angle 75° The new saw chain (1/4" RMC) is characterized by
Depth gauge setting 0.025 in. low vibration, smooth cutting, good control and high
(0.65 mm) cutting performance.
The application range of the new 1/4" RAPID™
1.5 Service note
Micro™ Comfort saw chain will include cutting where
The saw chain can be serviced with the rivet the emphasis is on a smooth, fine cut such as
spinners and chain breakers NG 4, NG 5 and NG 7. pruning and tree surgery.
1.5.1 Replacing cutters
Repair kits "Right-hand cutter" and "Left-hand
cutter" are available for replacement. Each repair kit
contains five cutters and five preset tie straps.
When servicing and repairing the chain, note the
direction of the tie strap (arrow head) and cutter –
the tie strap and cutter must be bevelled at the heel
of the running surface.
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Technical Information 03.2008 Page 3
2.2.1 1/4" RAPID™ Micro™ Comfort features 2.3.1 1/4" RAPID™ Micro™ Special features
2 1
689TI131 KN
689TI132 KN
. The letter "C" is featured on each cutter (1) and . As with the 1/4" RAPID™ Micro™ Comfort, a "C"
an arrow head in each tie strap (2). The arrow is incorporated into the cutters and an arrow
indicates the direction of the running saw chain. head is stamped on each tie strap.
. Shortened cutters (arrow) – cutters are angled
2.2.2 Advantages
at rear
. High cutting performance
. Reduced feed effort
. Low vibrations 2.3.2 Angled cutters
. Good control The small diameter bar nose of the STIHL carving
guide bar facilitates fine and detailed cuts.
. Smooth running
2.3 1/4" RAPID™ Micro™ Special
In addition to the advantages of the 1/4" RMC saw
chain, the 1/4" RMS saw chain will offer less stress
at the nose of the guide bar when used in
combination with the STIHL carving guide bars.
The application range of the new 1/4" RAPID™
Micro™ Special saw chain will include operations
689TI133 KN
that require fine and precise cuts when used in
combination with the STIHL carving guide bars.
Due to the lenght of the cutter (arrow) on standard
saw chain, the rear of the cutter increases pressure
against the bar nose forcing the chain out of the cut.
This will create an increase in feed effort during
cutting.
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2.4 Sharpening the saw chain
The side plate and top plate cutting angle of the
1/4" RMC chain, the 1/4" RMS chain and the
previous 1/4" RM chain are identical.
The new 1/4" RMC chain and 1/4" RMS chains are
serviced and sharpened identical to the
1/4" RAPID™ Micro™ saw chain.
Sharpening angle 30°
689TI134 KN
Side plate angle 75°
Depth gauge setting 0.025 in.
(0.65 mm)
The 1/4" RAPID™ Micro™ Special saw chain with
angled cutter (arrow) reduces pressure against the 2.5 Service note
bar nose. This decreases feed effort and prevents The saw chain can be serviced with the rivet
the cutter from being forced out of the cut when spinners and chain breakers NG 4, NG 5 and NG 7.
used in combination with STIHL carving bars.
Replacing cutters
2.3.3 Advantages Repair kits "Right-hand cutter" and "Left-hand
. Less stress at the nose of the guide bar cutter" are available for replacement. Each repair kit
contains five cutters and five preset tie straps.
. Reduced feed effort
When servicing and repairing the chain, note the
. Smooth cutting
direction of the tie strap (arrow head) and cutter –
. Low vibrations the tie strap and cutter must be bevelled at the heel
of the running surface.
Replacing tie straps
When replacing the tie straps between cutters, use
left-hand (preset) tie strap with rivet 3660 660 7200
and the tie strap without rivet 3660 662 5000. Take
note to install the tie strap in the correct running
direction (arrow head).
3. Saw chain types
Previous Previous New New Chain pitch Drive link guage
chain type marketing chain type marketing
number number
3989 33 RM 3650 33 RMC 3/8" 1.3 mm
3990 35 RM 3651 35 RMC 3/8" 1.5 mm
3991 36 RM 3652 36 RMC 3/8" 1.6 mm
3856 13 RM 3660 13 RMC 1/4" 1.3 mm
– – 3661 13 RMS 1/4" 1.3 mm
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Technical Information 03.2008 Page 5
4. Spare parts
Item Part name Part No. Remarks
3/8" RAPID™ Micro™ Comfort (3/8" RMC)
1 Cutter repair kit, r/h 3652 007 1000 1)
2 Cutter repair kit, l/h 3652 007 1001 2)
3 Tie strap with rivets (preset) 3724 660 6600
4 Tie strap without rivets 3718 662 1200
5 Drive link 3/8" Rapid; 1.3 mm 3833 662 1000
6 Drive link 3/8" Rapid; 1.5 mm 3844 662 1000
7 Drive link 3/8" Rapid; 1.6 mm 3725 662 1000
1/4" RAPID™ Micro™ Comfort (1/4" RMC)
1 Cutter repair kit, r/h 3660 007 1000 1)
2 Cutter repair kit, l/h 3660 007 1001 2)
3 Tie strap, left-hand, with rivets (preset) 3660 660 7200
4 Tie strap without rivets 3660 662 5000
5 Drive link 1/4" RAPID; 1.3 mm 3731 662 1001
1/4" RAPID™ Micro™ Special (1/4" RMS)
1 Cutter repair kit, r/h 3661 007 1000 1)
2 Cutter repair kit, l/h 3661 007 1001 2)
3 Tie strap, left-hand, with rivets (preset) 3660 660 7200
4 Tie strap without rivets 3660 662 5000
5 Drive link 1/4" RAPID; 1.3 mm 3731 662 1001
Remarks
1) Contains five right-hand cutters and five left-hand (preset) tie straps with rivets
2) Contains five left-hand cutters and five right-hand (preset) tie straps with rivets
© ANDREAS STIHL AG & Co. KG, 2008 Technical Documentation
D1/MTK-bl
TI_03_2008_11_30_01.fm Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.