Pitch
is the overall size of the chain. Measure pitch as the distance between drive link rivets divided by 2.
Bar below is 3/8 pitch or .375.
The pitch of the chain must match the pitch of the drive sprocket and guide bar tip.
Frawleys Saw Shop and Variety Store
Bar pictured above uses 72 Drive links and any Oregon chain with 72 on the drive link.
Saw Maintenance video
Technical tips for chain ID video
Gauge -shown below
is the thickness of the drive link. It is determined by measuring the portion of the drive link that fits into the groove of the guide bar. Common saw chain gauge sizes are .043" (1.1mm), .050" (1.3mm), .058" (1.5mm), and .063" (1.6mm).
bar below is .050 gauge or 1.3mm.
What Chain Do I need?
First -Look for any combination of numbers stamped on the guide bar.
Saw chain and guide bars both have identification marks on them, and unless they are extremely worn out, they explain what pitch and gauge of chain is on your saw. Look for any numbers and letters on the drive links. That will often tell you what pitch and gauge you’re running. Look below to match up a chain DL number.
The chain must match the guide bar numbers and sprocket to work correctly.
Finally- count the number of drive links on your old chain loop to get the correct replacement chain. The drive link count is the last 3 numbers before the G on the chain part number.
example 72LGX072G = 72 Drive Links 72LGX070G = 70 Drive Link count
Carlton drive link codes
A1 = 3/8 pitch .050 gauge
A2 = 3/8 pitch .058 gauge
A3 = 3/8 pitch .063 gauge
B1 = 404 pitch .050 gauge
B2 = 404 pitch .058 gauge
B3 =404 pitch .063 gauge
E1 = 1/4" mini pitch .050 gauge
K1 = .325 pitch .050 gauge
K2 = .325 pitch .058 gauge
K3 = .325 pitch .063 gauge
N1 = 3/8 low profile .050 gauge
N4 = 3/8 low profile .043 gauge
Husqvarna chain codes
00 = 1/4" mini .050 Gauge
22,23,30,37 or 78 = .325 pitch .050 gauge
21,25 or 38 = .325 pitch .058 gauge
26 = .325 pitch .063 gauge
35 and 36 = 3/8 low profile .050 gauge
46,47,51,80 or 82 = 3/8 pitch .050 gauge
42,48,54 or 81 = 3/8 pitch .058 gauge
45,50 or 83 = 3/8 pitch .063 gauge
69 = .404 pitch .058 gauge
57,64 or 65 = 404 pitch .063 gauge
Oregon drive link codes
# Stamped on drive links.
9 = 1/2" pitch .058 gauge or 1.5mm
10 = 1/2" pitch .063 gauge or 1.6mm
11 = 3/4" .122 gauge
16 = .404 pitch .063 gauge
18 = .404 pitch .080 gauge
19 = .325 pitch .063 gauge
20 = .325 pitch .050 gauge or 1.3mm
21 = .325 pitch .058 gauge or 1.5mm
22 = .325 pitch .063 gauge or 1.6mm
25 = 1/4 mini-pitch .050 gauge
26 = .404 pitch .058 gauge or 1.5mm
27= .404 pitch .063 gauge or 1.6mm
28 = .404 pitch .050 gauge or 1.3mm
33 = .325 pitch .050 gauge or 1.3mm
34 = .325 pitch .058 gauge or 1.5mm
35 = .325 pitch .063 gauge or 1.6mm
50 = .404 pitch .050 gauge or 1.3mm
51 = .404 pitch .058 gauge or 1.5mm
52 = .404 pitch .063 gauge or 1.6mm
58 = .404 pitch .058 gauge or 1.5mm
59 = .404 pitch .063 gauge or 1.6mm
68 = .404 pitch .063 gauge or 1.6mm
72 = 3/8 pitch .050 gauge or 1.3mm
73 = 3/8 pitch .058 gauge or 1.5mm
75 = 3/8 pitch .063 gauge or 1.6mm
76 = 3/8 pitch .050 gauge or 1.3mm
77 = 3/8 pitch .058 gauge or 1.5mm
78 = 3/8 pitch .063 gauge or 1.6mm
90 = 3/8 Low profile pitch .043 gauge or 1.1mm
91 = 3/8 low profile pitch .050 gauge or 1.3mm
95 = .325 pitch .050 gauge or 1.3mm
STIHL PART NUMBER TO OREGON
Then just add drive link count
25RM, 25RMC, 25RM2 or 25RMC3 = 21BPX
33RM, 33RMC3 or 33RMC = 72DPX
33RMF = 72APX
33RS or 33RSC = 72EXL
33RSC3 = 72LPX
33RSF = 72EXJ
33RSLK = 72CL
33RSLHK = 72CK
33RSLF = 72CJ
35RM,35RMC or 35RMC3 = 73DPX
35RS,or 35RSC = 73EXL
35RSC3 = 73LPX
35RSF = 73EXJ
36RM,36RMC or 36RMC3 = 75DPX
36RS or 36RSC = 75EXL
36RSC3 = 75LPX
36RSF = 75EXJ
36RSLK = 75CL
36RSLHK = 75CK
36RSLFK = 75CJ
46RM = 27X
46RMF = 27AX
46RS = 68LX
46RSF = 68JX
61PMN,61PMC,61PMMC3 or 61PM1 = 90PX
63PM or 63PMC3 = 91VXL
63PM1 = 91PX
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