Product Description
Shimano 10SRL Idle Gear (BNT5659) | Modern Baitcast Level Wind Drive
The Shimano 10SRL Idle Gear (BNT5659) is a precision-molded internal component found in Shimano’s current generation of low-profile baitcasting reels. This gear is a fundamental part of the level wind system, serving as the mechanical link that transfers rotational energy from the main drive gear to the worm shaft. Its operation ensures that your fishing line is distributed evenly across the spool during every retrieve.
Like many idle gears in Shimano's lineup, the 10SRL is made from a high-density, self-lubricating polymer. This material is chosen for its quiet operation and its role as a mechanical fail-safe; if the level wind becomes jammed by heavy debris or a severe backlash, this plastic gear is designed to strip its teeth to prevent permanent damage to the more expensive metal drive gears.
Product Specifications
-
Part Name: Idle Gear
-
Shimano Part Number: 10SRL
-
Alternate Part Number: BNT5659
-
Material: High-Impact Industrial Polymer
-
Function: Final drive connection for the level wind worm shaft.
Compatible Reel Models
The 10SRL (BNT5659) is the factory-standard idle gear for many of Shimano’s most popular modern baitcasters, particularly in the 150 and 200 sizes. It is a direct fit for:
-
Shimano Curado K: 200K, 201K, 200HGK, 201HGK, 200XGK, 201XGK.
-
Shimano Curado DC: 150DC, 151DC, 150HGDC, 151HGDC, 150XGDC, 151XGDC.
-
Shimano SLX: 150, 151 (Standard, XT, and DC models including HG and XG variants).
-
Shimano Scorpion: Select modern MGL and DC models (Verify by schematic).
Technical Tip: If your level wind has stopped moving or you feel a consistent "click" while reeling, inspect this gear for missing teeth. Because it is a "wear item" designed to protect the reel, it is one of the most common internal replacements in hard-working baitcasters. You can verify the exact placement on the 17CU200K or 19SLX150DC schematics.
Maintenance & Lubrication Recommendation
Because the 10SRL is a polymer gear, it requires lubricants that provide a waterproof barrier without causing the plastic to swell or degrade over time. We recommend Deuthlon Lubricants:
-
For the Gear Teeth: Apply a light, even coating of Deuthlon Reel Gear Grease. This grease is safe for all plastics and provides a tacky surface that stays on the gear teeth, ensuring a silent and smooth level wind operation.
-
For the Support Pin: Apply a single drop of Deuthlon Power Cast Oil to the post where the gear rotates. This reduces rotational drag, which is essential for maintaining the "Shimano Smooth" feel during the retrieve.
Why Use Genuine Shimano 10SRL?
-
Precision Pitch: Guaranteed to mesh perfectly with the Worm Shaft Gear, preventing the "gear buzz" often felt with low-quality aftermarket parts.
-
Engineered Failure Point: Calibrated to shear under high stress, saving your main gear and frame from catastrophic damage during a jam.
-
Chemical Resistance: Tested to remain stable when exposed to common synthetic oils and cleaning agents, preventing the gear from becoming brittle.
