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The STIHL Rapid Duro 3 (33 RD3) is a 16-inch, 3/8-inch pitch, .050-gauge carbide-tipped chain with 60 drive links. Its tungsten carbide cutters hold an edge far longer than steel chain, so it keeps cutting in dirty wood, treated lumber, roots and stumps that dull ordinary chains fast. It is a low-kickback, green-coded loop built for arborists, firewood cutters and crews working abrasive or frozen timber. Against standard STIHL steel chain it trades a higher upfront cost and slower sharpening for much longer edge life; carbide needs a diamond grinder, not a file.
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Owners who cut dirty, sandy or treated wood report the carbide cutters keep cutting long after steel chain would need sharpening. The common complaint is the cost and the need for diamond sharpening equipment.
This is a STIHL Rapid Duro 3 (RD3) chainsaw chain, model 33 RD3 with 60 drive links, for 16-inch bars. It uses tungsten carbide-tipped cutters. They stay sharp up to four times longer than standard steel chain cutters.
The chain combines standard-sized cutters with low-kickback features. It is made for cutting dirty or muddy wood, frozen or treated wood, roots, stumps and reclaimed lumber. It also suits storm cleanup, demolition work and firewood cutting in abrasive conditions.
Carbide chains can't be hand filed. They must be sharpened with a formed diamond grinding wheel, so special sharpening equipment is required.
