Description
STIHL OEM 3691 005 0091 RAPID™ Micro RMX Ripping Chainsaw Chain – 28", 3/8" Pitch, .050" Gauge, 91 Drive Links – Semi-Chisel Ripping Chain
Get smooth, precise longitudinal cutting performance with the STIHL RAPID™ Micro RMX Ripping Chainsaw Chain. Genuine STIHL OEM part number 3691 005 0091 is a 28" specialty ripping saw chain featuring 3/8" (.375") pitch, .050" (1.3 mm) gauge, and 91 drive links. Specifically engineered for cutting parallel to the wood grain, RAPID Micro RMX delivers controlled cutting performance and an excellent surface finish when milling logs into boards, planks, and lumber.
Unlike conventional crosscut chains, STIHL RAPID Micro RMX features specially designed semi-chisel cutters with a 10-degree sharpening angle. This specialized cutter geometry allows the chain to cut efficiently along the wood fibers rather than across them, helping produce smoother cuts and more consistent results during longitudinal cutting applications.
The RMX chain features modified cutter geometry and specially shaped depth gauges designed to improve cutting stability and reduce vibration. These features help operators maintain control during long milling cuts while producing a smooth, consistent cutting surface.
Designed for professional chainsaw milling, portable sawmills, and freehand longitudinal cutting, STIHL RAPID Micro RMX is an excellent choice for operators converting logs into usable lumber. Its durable semi-chisel cutter design provides dependable performance and straightforward maintenance during demanding ripping applications. The 28" configuration offers additional cutting capacity for larger logs when used with an approved chainsaw and guide bar.
Chainsaw chain compatibility depends on the specifications of your guide bar, drive sprocket, and cutting system—not simply the chainsaw model or bar length.
Always verify your current chain specifications:
- 28" (approximately 70 cm) Bar Length
- 3/8" (.375") Standard Pitch
- .050" (1.3 mm) Gauge
- 91 Drive Links
- STIHL RMX / RAPID Micro Ripping Chain
- Specialized Semi-Chisel Ripping Cutters
- 10° Sharpening Angle
- Designed for Longitudinal Cutting and Chainsaw Milling
Bar length alone does not guarantee compatibility. Guide bars of the same advertised length may require different drive-link counts, pitches, or gauges. Always verify all specifications before ordering.
Important – Specialized Ripping Chain: STIHL RMX is specifically designed for cutting parallel to the wood grain. It is not intended as a direct replacement for a conventional crosscut chain in general-purpose chainsaw cutting applications.
Sharpening Warning: RMX ripping chain requires a 10-degree sharpening angle. Do not sharpen this chain using the conventional 30-degree crosscutting angle commonly used on standard STIHL chainsaw chains.
Important: This chain uses standard 3/8" pitch, not 3/8" Low Profile (Picco). The chain pitch must match the drive sprocket and guide bar nose, and the .050" gauge must match the guide bar groove.
Long-Bar Warning: A 28" guide bar requires a chainsaw with sufficient engine power, proper chain lubrication, and manufacturer approval for the bar length. Chainsaw milling places additional demands on the cutting system because the chain remains engaged in the wood during extended cuts.
Chainsaw Milling Safety: Chainsaw milling requires appropriate equipment, adequate engine power, proper lubrication, and safe operating procedures. Confirm that your chainsaw and milling attachment are approved for the intended application. Follow all STIHL and chainsaw mill manufacturer safety instructions.
Kickback Safety: Do not assume this specialty ripping chain provides low-kickback protection. Follow the manufacturer's cutting attachment recommendations and use appropriate protective equipment. STIHL recommends low-kickback cutting attachments wherever appropriate.
If you're unsure, contact us with your STIHL chainsaw model, serial number, guide bar information, and current chain number. We'll help verify the correct ripping chain before you order.
Product Features
- Genuine STIHL OEM replacement chainsaw chain
- STIHL OEM Part Number: 3691 005 0091
- STIHL RMX – RAPID™ Micro Ripping Chain series
- 28" chain with 91 drive links
- 3/8" (.375") standard pitch
- .050" (1.3 mm) gauge
- Specialized semi-chisel ripping cutter design
- Modified cutter geometry designed for longitudinal cutting
- 10-degree sharpening angle specifically designed for ripping applications
- Designed to cut parallel to the wood grain
- Produces smooth, consistent cutting surfaces when milling lumber
- Excellent for converting logs into boards and planks
- Ideal for portable chainsaw mills and longitudinal cutting machines
- Suitable for professional freehand ripping applications
- Specially designed depth gauges help improve cutting stability
- Low-vibration cutting characteristics help improve operator comfort
- Improved control during extended longitudinal cuts
- Durable semi-chisel cutter design
- Dependable cutting performance in softwood and hardwood
- Designed for professional wood milling applications
- Excellent for custom lumber production
- Suitable for cutting dimensional lumber directly from logs
- 28" configuration provides additional cutting capacity for larger milling applications
- Genuine STIHL manufacturing quality and precision
- Designed for consistent cutting performance and durability
- Requires specialized 10-degree sharpening geometry
- Sold as one complete chain loop
Specifications
- Brand: STIHL
- OEM Part Number: 3691 005 0091
- Chain Type: RMX
- Chain Family: RAPID™ Micro Ripping Chain
- Product Type: Specialty Ripping Chainsaw Chain
- Package Quantity: 1 Chain Loop
- Bar Length: 28" (approximately 70 cm)
- Pitch: 3/8" (.375")
- Gauge: .050" (1.3 mm)
- Drive Links: 91
- Cutter Type: Modified Semi-Chisel
- Cutter Design: Specialized Ripping Cutter
- Cutting Direction: Longitudinal / Parallel to Wood Grain
- Sharpening Angle: 10 Degrees
- Application: Chainsaw Milling and Longitudinal Wood Cutting
- Cutting Characteristics: Smooth Cutting, Reduced Vibration, Improved Control
- Recommended Equipment: Compatible Professional Chainsaws and Chainsaw Milling Attachments
- Recommended Applications: Portable Sawmills, Chainsaw Milling, Lumber Production, Board Cutting, Plank Cutting & Freehand Ripping
What Makes STIHL RAPID Micro RMX Different?
STIHL RAPID Micro RMX is specifically engineered for longitudinal cutting applications where the saw chain travels parallel to the wood fibers. Unlike conventional chainsaw chains designed primarily for crosscutting, RMX features specialized cutter geometry that provides smoother and more controlled cutting when ripping lumber from logs.
Specialized Ripping Cutter Design: RMX uses modified semi-chisel cutters designed to efficiently cut along the grain. This design helps produce a more uniform cutting surface and improves performance during long milling cuts.
10-Degree Sharpening Angle: The specialized 10-degree sharpening angle is one of the most important differences between RMX ripping chain and conventional crosscutting chains. This geometry helps the cutters remove material smoothly when traveling parallel to the wood fibers.
Smoother Cutting Surface: The specialized cutter geometry and depth gauge design help produce a consistent surface finish when milling boards, planks, and other lumber directly from logs.
Reduced-Vibration Design: STIHL RMX is designed for smooth cutting behavior with reduced vibration, helping improve control and operator comfort during extended milling operations.
Professional Milling Performance: RMX is an excellent choice for portable chainsaw mills, large longitudinal cutting machines, and experienced operators performing freehand ripping cuts.
Durable Semi-Chisel Cutters: The modified semi-chisel design provides dependable cutting performance and allows routine sharpening and maintenance using the proper ripping-chain specifications.
Designed for Chainsaw Milling & Longitudinal Cutting
Chainsaw milling places different demands on a saw chain than conventional crosscutting. When milling lumber, the chain cuts along the wood grain for an extended distance, often remaining engaged in the wood throughout a long, continuous cut.
STIHL RAPID Micro RMX is specifically designed for these applications. Its specialized cutter geometry helps improve cutting consistency and surface finish while maintaining controlled cutting performance.
Portable Chainsaw Mills: RMX is ideal for chainsaw milling attachments used to convert logs into boards, planks, and custom lumber.
Longitudinal Cutting Machines: The chain is suitable for compatible professional milling equipment designed for cutting parallel to the wood grain.
Freehand Ripping: Experienced operators can use RMX for specialized freehand longitudinal cuts when proper equipment and safe cutting techniques are used.
Custom Lumber Production: RMX is an excellent choice for producing slabs, boards, planks, and other lumber from logs where a consistent cutting surface is important.
Fits Saw Systems Using These Chain Specifications
Required Chain Specifications: 28" Bar, 3/8" Pitch, .050" Gauge, 91 Drive Links
This chain is designed for compatible chainsaws equipped with a guide bar and drive sprocket system requiring standard 3/8" pitch, .050" (1.3 mm) gauge, and exactly 91 drive links.
STIHL RMX is intended for compatible chainsaws and milling equipment designed for longitudinal woodcutting applications. The 28" configuration is particularly useful for larger milling projects when the chainsaw has sufficient power and lubrication capacity.
Important: Chainsaws may be equipped with different guide bars, sprockets, and chain configurations depending on the model and application. Always verify the specifications stamped on the guide bar and compare them with the existing chain before ordering.
Do not substitute this chain for 3/8" Picco, .325", or other chain configurations. Confirm that the chainsaw and milling attachment are suitable for ripping applications.
Model Fitment: Verify compatibility by guide bar specifications, drive sprocket pitch, drive-link count, and the chainsaw manufacturer's approved cutting attachments. A chainsaw model alone does not establish fitment.
Common Applications
- Professional chainsaw milling
- Portable chainsaw sawmills
- Longitudinal wood cutting
- Cutting parallel to the wood grain
- Converting logs into lumber
- Producing dimensional lumber
- Cutting boards and planks
- Custom lumber production
- Cutting live-edge wood slabs
- Small-scale sawmill operations
- Professional woodworking
- Farm and homestead lumber production
- Hardwood milling
- Softwood milling
- Specialized freehand ripping applications
Frequently Purchased Together
- STIHL 28" guide bar compatible with 3/8" pitch, .050" gauge, and 91 drive links
- Compatible 3/8" drive sprocket or rim sprocket – verify chainsaw model
- STIHL bar and chain oil
- STIHL round sharpening file – verify the correct diameter for RMX chain
- STIHL filing guide for maintaining the 10-degree ripping angle
- STIHL depth gauge tool
- Guide bar groove cleaner
- Guide bar maintenance tools
- Replacement guide bar nuts – verify chainsaw model
- Chainsaw milling attachment or portable chainsaw mill
- Replacement air filter – verify chainsaw model
- Replacement spark plug – verify chainsaw model
Installation & Sharpening Tips
- Shut off the chainsaw and disconnect the spark plug or remove the battery before servicing the cutting attachment.
- Verify that your guide bar requires a 28" chain with 3/8" pitch, .050" gauge, and exactly 91 drive links.
- Do not select this chain based on 28" bar length alone. Pitch, gauge, and drive-link count must all match.
- Confirm that the guide bar groove is designed for .050" (1.3 mm) gauge drive links.
- Make sure the guide bar nose and drive sprocket are compatible with standard 3/8" pitch chain.
- Clean the guide bar groove and oil passages before installing the new chain.
- Inspect the guide bar and drive sprocket for excessive or uneven wear before installing a new chain.
- Install the chain with the cutting edges facing forward across the top of the guide bar.
- Make sure all 91 drive links are properly seated in the guide bar groove and sprocket.
- Adjust chain tension according to the STIHL operator's manual.
- Recheck chain tension after initial operation and periodically during use.
- Confirm that the chainsaw is receiving an adequate supply of clean bar and chain oil.
- Long milling cuts generate significant heat and place continuous demands on the cutting attachment. Maintain proper lubrication throughout the operation.
- Maintain the specialized 10-degree sharpening angle when sharpening STIHL RMX ripping chain.
- Do not sharpen RMX using the conventional 30-degree crosscutting angle.
- Use the correct round file diameter and filing guide recommended by STIHL for the RMX chain.
- Follow STIHL's sharpening instructions for proper file positioning, cutter geometry, and depth gauge settings.
- Keep cutter lengths consistent on both sides of the chain to help maintain straight cutting.
- Inspect cutters regularly for dullness, damage, or excessive wear.
- Avoid contact with dirt, rocks, metal, and other abrasive materials that can damage or dull the cutting edges.
- When milling, use steady feed pressure and allow the chain to cut without forcing the saw through the wood.
- Make sure the chainsaw has adequate engine power and lubrication capacity for the intended milling application.
- Follow the chainsaw mill manufacturer's recommendations for setup, cutting procedures, and safe operation.
- Use appropriate protective equipment and follow all STIHL chainsaw safety instructions.
Why Choose STIHL RAPID Micro RMX Ripping Chains?
STIHL RAPID™ Micro RMX ripping chains are engineered for professional wood milling and longitudinal cutting applications. Their specialized semi-chisel cutter geometry and 10-degree sharpening angle provide smoother cutting, reduced vibration, and improved control compared with conventional crosscut chains when cutting along the wood grain.
Designed for portable chainsaw mills, longitudinal cutting machines, custom lumber production, and specialized freehand ripping, RMX offers dependable performance and precision during demanding milling operations.
STIHL OEM 3691 005 0091 is the RAPID Micro RMX configuration for cutting systems requiring a 28" bar, 3/8" pitch, .050" gauge, and 91 drive links.
Not Sure If This Is the Right Chain?
Contact us with your STIHL chainsaw model, serial number, guide bar specifications, and current chain number. We'll help verify the correct ripping chain for your equipment before you order.