Product Description
Shimano 10FNH Handle Nut (BNT3441)
The Shimano 10FNH Handle Nut (BNT3441) is the primary fastener that secures the handle assembly to the drive shaft (crank shaft) on Shimano baitcasting reels. This is a high-stress component that ensures all the torque from your hand is transferred directly into the reel's gear system without slippage or wobble.
Because Shimano baitcasting reels come in both Right-Hand and Left-Hand versions, it is critical to note that handle nuts are thread-specific. A right-hand reel uses a standard thread, while a left-hand reel uses a reverse thread. The BNT3441 is the standard configuration for the most popular Shimano low-profile series.
Product Specifications
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Part Name: Handle Nut
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Part Number: 10FNH
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Shimano Code: BNT3441
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Material: Anodized Aluminum / Plated Steel (depending on model year)
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Threading: Right-Hand Thread (Standard)
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Function: Anchors the handle to the drive shaft.
Alternate Part Numbers
This part is a cornerstone of Shimano’s baitcasting hardware and is identified as:
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BNT3441
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BNT3507 (Commonly associated with specific Curado/Chronarch variants)
Compatibility & Fitment
The 10FNH (BNT3441) is a universal-fit nut for a wide range of Shimano’s "Gold Standard" baitcasters. It is a direct factory fit for:
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Shimano Curado Series: CU-200B, CU-200BSV, CU-200DPV, CU-200E, CU-200G, CU-200K
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Shimano Chronarch Series: CH-100A, CH-100B, CH-100D, CH-50E, CH-200E
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Shimano Citica Series: CI-200B, CI-200D, CI-200E, CI-200G
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Shimano Calcutta Series: CT-50, CT-100, CT-200, CT-400 (Standard and "B" models)
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Shimano Core Series: 50MG, 100MG
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Shimano Scorpion Series: 1000, 1500, XT variants
Key Features
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Precision Machining: Threaded to match the M8 x 0.75 or M7 x 0.75 pitch (depending on the specific drive shaft) used in high-end Shimano reels.
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Low Profile Design: Engineered to sit flush so the Handle Nut Retainer (BNT2114) can fit over it perfectly.
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Corrosion Resistance: Anodized finish protects the threads from "cold welding" or seizing to the drive shaft due to salt exposure.
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Standard Wrench Size: Fits the standard 10mm or 11mm Shimano handle wrench found in most reel service kits.
Critical Installation Tips
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Hand Thread First: Always start the nut by hand. Because these are often made of aluminum, they are very easy to cross-thread if you start them with a wrench.
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Don't Over-Tighten: You only need to tighten the nut enough to line up one of its "flats" with the screw hole for the Handle Nut Retainer. The retainer screw is what actually keeps the nut from backing off; the nut itself does not need to be "cranked" down.
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Check Rotation: If you have a Left-Hand retrieve reel (model numbers ending in 1, like 201K), this nut will likely not fit, as you would need the left-hand thread version (BNT3442).
Pro Tip: If you are replacing a lost nut, ensure you also have the Handle Nut Retainer (Plate) and the Retainer Screw. Without the plate, the vibration of the handle will cause this nut to spin off and fall into the water. You can find the full handle stack diagram at www.reelschematic.com.
