Product Description
Shimano 10FNN Handle Nut (BNT2417)
The Shimano 10FNN Handle Nut (BNT2417) is a specialized fastener used to secure the handle assembly to the drive shaft on Shimano baitcasting reels. The 10FNN designation typically refers to a Left-Hand (Reverse Thread) nut designed for small to mid-sized low-profile reels.
In the world of baitcasting, left-hand retrieve reels require reverse-threaded nuts. This ensures that the natural rotation of the handle while reeling actually keeps the nut tight rather than loosening it. If you attempt to force this nut onto a right-hand reel, or turn it clockwise to tighten it, you will permanently damage the threads on your drive shaft.
Product Specifications
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Part Name: Handle Nut (Left-Hand)
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Part Number: 10FNN
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Shimano Code: BNT2417
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Material: Anodized Aluminum / Plated Steel
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Threading: Left-Hand (Reverse) Thread
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Function: Secures the handle to the drive shaft on LH models.
Alternate Part Numbers
This part is a standard component for many "Golden Era" and modern Shimano LH reels, identified as:
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BNT2417
Compatibility & Fitment
The 10FNN (BNT2417) is a direct factory fit for a wide range of Shimano’s high-performance Left-Hand retrieve reels:
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Shimano Curado Series: CU-201B, CU-201BSV, CU-201DPV, CU-201E, CU-51E
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Shimano Chronarch Series: CH-101A, CH-101B, CH-51E, CH-201E
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Shimano Citica Series: CI-201B, CI-201D, CI-201E
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Shimano Scorpion Series: 1001, 1001MG, 1501XT (JDM Models)
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Shimano Core Series: 51MG, 101MG
Key Features
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Reverse-Thread Security: Tightens by turning Counter-Clockwise, preventing the nut from spinning off during left-hand retrieves.
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Low Profile Geometry: Specifically shaped to fit under the Handle Nut Retainer (BNT2114 or BNT3508) without rubbing.
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Corrosion Protection: Anodized finish helps prevent "galvanic corrosion" between the aluminum nut and the stainless steel drive shaft.
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OEM Precision: Guaranteed to match the M8 x 0.75 pitch found on most Shimano baitcasting drive shafts.
Critical Installation Tips
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Lefty-Tighty: Remember that for this specific part, you must turn the wrench Counter-Clockwise to tighten.
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The "Spin" Test: Before using a wrench, spin the nut on by hand. If it doesn't spin freely for several rotations, stop immediately—you likely have the wrong thread direction for your reel or are cross-threading the part.
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Alignment: Tighten the nut until one of the flat sides is perfectly aligned with the screw hole for the Handle Nut Retainer. The retainer plate is what actually prevents the nut from vibrating loose; never fish without it.
Pro Tip: If your reel model number ends in a "0" (e.g., 200, 100, 50), you likely need the Right-Hand version (BNT2416 / 10FNM) instead of this one. You can verify your specific model's requirements at www.reelschematic.com.
