Product Description
Shimano 10BT2 Click Spring (BNT2123)
The Shimano 10BT2 Click Spring (BNT2123) is a small but critical tension component used within the adjustment systems of Shimano baitcasting and round reels. This spring provides the necessary outward pressure for the Click Pin (10BTO), forcing it against the notches of the click gear. This interaction is what creates the tactile "click" and audible feedback when you adjust your star drag or spool tension knob.
Because this spring is under constant tension and is very small, it can lose its elasticity over years of use or easily be lost during reel cleaning and maintenance. A missing or weakened spring results in a "silent" adjustment that can easily vibrate out of position. Replacing it with this genuine Shimano factory part ensures your settings stay locked in and provides that crisp, professional feel to your reel's interface.
Product Specifications
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Part Name: Click Spring
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Part Number: 10BT2
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Shimano Code: BNT2123
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Material: High-Memory Spring Steel
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Function: Provides tension to the click pin for audible/tactile indexing.
Alternate Part Numbers
This part is frequently identified by the following Shimano identification number in schematics and service manuals:
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BNT2123
Compatibility & Fitment
The 10BT2 (BNT2123) is a standard component across a vast range of Shimano’s legacy and modern baitcasting reels. It is a direct factory fit for the following series:
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Shimano Curado Series: CU-200B, CU-201B, CU-200BSV, CU-200HST
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Shimano Calcutta Series: CT-50, CT-100, CT-100B, CT-200, CT-200B, CT-400, CT-400B
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Shimano Citica Series: CI-200, CI-201
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Shimano Cardiff Series: CDF-100A, CDF-200A, CDF-300A, CDF-400A
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Shimano Corvalus Series: CVL-200, CVL-300, CVL-400
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Shimano Castaic Series: CA-200, CA-200SF
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Shimano Bantam Series: Fits multiple models utilizing the BNT2123 spec.
Pro Tip: During installation, it is helpful to use a tiny amount of tacky grease to hold the spring and pin in their housing while you reassemble the star drag or tension cap. This prevents the parts from "shooting out" and becoming lost. To see the exact assembly order of the handle stack, refer to the PDF schematics at www.reelschematic.com.
Key Features
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Optimal Tension: Specifically calibrated to provide enough pressure for a loud click without making the adjustment too difficult to turn.
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Corrosion Protection: Treated to resist rust, ensuring the spring doesn't seize inside the click pin hole.
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Exact Fit: Designed to seat perfectly in the small-diameter recesses found in Shimano drive shafts and drag stars.
