Product Description
Shimano 10NDN Worm Bushing (A) (BNT1699) | Level Wind Support
The Shimano 10NDN Worm Bushing (A) (BNT1699) is a precision-molded internal component essential for the smooth operation of the level wind system on Shimano baitcasting reels. This bushing sits at the end of the worm shaft, providing a low-friction bearing surface that allows the shaft to rotate freely as it moves the line guide back and forth across the spool.
As a "wear item" made of high-quality industrial polymer, the 10NDN is designed to provide smooth movement while protecting the more expensive metal worm shaft from direct contact with the reel frame. Over time, grit or lack of lubrication can cause this bushing to wear down or crack, leading to a "sticky" level wind or uneven line lay.
Product Specifications
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Part Name: Worm Bushing (A)
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Shimano Part Number: 10NDN
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Alternate Part Number: BNT1699, TGT1890
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Material: High-Density Anti-Friction Polymer
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Function: Supports the non-drive end of the worm shaft (level wind).
Compatible Reel Models
The 10NDN (BNT1699) is a widely used component across several generations of Shimano’s round and low-profile baitcasters. It is a direct fit for:
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Shimano Calcutta: CT-50/100/150/200/400 (Original, B, D, and GTB series).
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Shimano Core: 100Mg, 100Mg7.
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Shimano Cardiff: Select models (Verify by schematic).
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Shimano Corvalus: Select models.
Technical Tip: Many anglers choose to upgrade this plastic bushing to a Ball Bearing (4x7x2.5mm) to further reduce friction and improve the smoothness of the level wind, especially when using heavy braided lines.
Maintenance & Lubrication Recommendation
The level wind system is highly exposed to water and debris brought in by the fishing line. Proper lubrication is vital to prevent the bushing from seizing or wearing prematurely. We recommend Deuthlon Lubricants:
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For the Bushing & Shaft: Apply a light coating of Deuthlon Power Cast Oil. This ultra-thin lubricant ensures the worm shaft spins with minimal resistance, which is critical for achieving maximum casting distance.
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For the Level Wind Guard: A light film of Deuthlon Reel Gear Grease on the external guard can help shed water and prevent salt/sand from reaching the internal bushing.
Why Use Genuine Shimano 10NDN Parts?
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Precise Tolerances: Ensures the worm shaft has exactly the right amount of "end play"—too tight will bind the gears; too loose will cause line-lay issues.
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Chemical Resistance: The specific polymer used is designed not to swell or degrade when exposed to common reel cleaners and synthetic lubricants.
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Structural Match: Fits perfectly into the reel frame's recess, preventing the worm shaft from vibrating during high-speed retrieves.
