Product Description
Shimano 10KM5 Line Roller (RD 9840) | Genuine Spinning Reel Part
The Shimano 10KM5 Line Roller (RD 9840) is a high-performance replacement component engineered to ensure a smooth, frictionless transition of fishing line from the bail to the spool. This part is critical for preventing line twist and reducing friction, which directly impacts casting distance and line longevity.
Manufactured with high-precision tolerances and a corrosion-resistant finish, the RD 9840 is a "high-wear" item. Over time, salt, grit, and line friction can create grooves or cause the roller to seize. Replacing a worn line roller restores the whisper-quiet operation and effortless retrieval that Shimano spinning reels are famous for.
Product Specifications
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Part Name: Line Roller / Bail Roller
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Manufacturer Part Number: 10KM5
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Schematic Part Number: RD 9840
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Material: Hardened Stainless Alloy with Protective Coating
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Application: Fits 500 to 4000 size spinning reels
Compatible Reel Models
The 10KM5 (RD 9840) is one of Shimano’s most versatile spinning reel parts, appearing in over 50 different models. It is a direct fit for the following series:
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Shimano Stradic: FI, FJ, and CI4 FA models (1000, 2500, 3000, 4000).
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Shimano Stella: FB and FD series.
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Shimano Sustain: FE and FG series.
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Shimano Saros: F and FA series.
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Shimano Sahara: FD, FE, and FJ models.
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Shimano Sedona: FD and FE models.
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Shimano Spirex: FG and RG series.
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Shimano Symetre: FJ, FL, and RI models.
Technical Note: For precise placement within the bail assembly—including the correct orientation of the narrow and wide grooves—refer to the official PDF schematics at www.reelschematic.com.
Maintenance & Lubrication Recommendation
The line roller is the most exposed moving part of a spinning reel. To prevent seizing and maintain an ultra-smooth rotation under heavy drag, we recommend Deuthlon Lubricants:
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For Bearings/Bushings: Use a single drop of Deuthlon Power Cast Oil. This ultra-thin, high-speed lubricant ensures the roller starts spinning instantly, even with light lures.
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For Saltwater Protection: Apply a light film of Deuthlon Reel Gear Grease to the internal spacer and the bail arm seat to prevent salt crystallization and galvanic corrosion between the metal parts.
Why Use Genuine Shimano RD 9840?
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Zero Line Twist: Specifically contoured to guide braided, monofilament, and fluorocarbon lines without pinching.
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Marine Durability: Constructed to resist "tea-staining" and pitting in harsh saltwater environments.
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Perfect Balance: Maintains the rotor balance of the reel, preventing wobbling during high-speed retrieves.
