Product Description
Shimano 10FNP Handle Nut (BNT2547)
The Shimano 10FNP Handle Nut (BNT2547) is a specialized fastener used to secure the handle assembly to the drive shaft on Shimano baitcasting reels. The 10FNP designation refers specifically to a Left-Hand (Reverse Thread) nut, typically used on small to mid-frame low-profile reels.
In the engineering of baitcasting reels, left-hand retrieve models require reverse-threaded nuts. This ensures that the rotational force of cranking the handle helps keep the nut tight. If a standard right-hand nut were used, the act of reeling would eventually cause the nut to spin off.
Product Specifications
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Part Name: Handle Nut (Left-Hand)
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Part Number: 10FNP
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Shimano Code: BNT2547
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Material: Anodized Aluminum / Plated Steel
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Threading: Left-Hand (Reverse) Thread
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Function: Anchors the handle to the drive shaft on LH models.
Alternate Part Numbers
This part is a standard component for many of Shimano’s high-performance Left-Hand (LH) reels, identified as:
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BNT2547
Compatibility & Fitment
The 10FNP (BNT2547) is a direct factory fit for a variety of Shimano’s "Golden Era" and modern Left-Hand retrieve reels. It is commonly found on:
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Shimano Curado Series: CU-101B, CU-101D, CU-51E
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Shimano Chronarch Series: CH-51E, CH-101A, CH-101B
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Shimano Citica Series: CI-101B, CI-101D
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Shimano Scorpion Series: 1001, 1001MG (JDM Models)
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Shimano Aldebaran Series: Select legacy LH models (Verify via BNT code)
Key Features
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Reverse-Thread Security: Tightens by turning Counter-Clockwise, preventing the nut from loosening during the retrieve.
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Compact Geometry: Designed with a specific hex-head height to allow the Handle Nut Retainer (Plate) to sit perfectly flush over it.
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Corrosion Protection: Features a protective finish to prevent "seizing" to the stainless steel drive shaft, which is common in reels exposed to salt or moisture.
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OEM Precision: Guaranteed to match the specific thread pitch used on Shimano’s precision-machined drive shafts.
Critical Installation Tips
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Remember: "Lefty-Tighty": For this specific part, you must turn the wrench Counter-Clockwise to tighten and Clockwise to loosen.
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Hand-Start First: Because this nut is often made of aluminum, it is very easy to cross-thread. Always thread it on by hand for 3–4 full rotations before using a wrench.
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Alignment for the Retainer: Tighten the nut until one of its flat sides aligns perfectly with the screw hole for the Handle Nut Retainer. The retainer plate is what actually keeps 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 (BNT2546) instead. You can find the full assembly diagram and parts list for your specific model at www.reelschematic.com.
