Product Description
Shimano 10BRB Spool Tension Spring (BNT1697)
The Shimano 10BRB Spool Tension Spring (BNT1697) is a specialized tensioning component located within the cast control assembly (spool tension knob) of Shimano baitcasting and round reels. This spring provides the necessary outward pressure against the spool tension spacers and the spool shaft, allowing for micro-adjustments to the spool's rotational speed.
A properly functioning tension spring is vital for preventing professional overruns (backlashes). Over time, the spring can lose its tension, become corroded by saltwater, or be lost during routine maintenance. Replacing it with this authentic Shimano OEM part ensures your cast control knob remains responsive and maintains the "setting" you choose for different lure weights.
Product Specifications
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Part Name: Spool Tension Spring
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Part Number: 10BRB
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Shimano Code: BNT1697
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Material: Spring-tempered Stainless Steel
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Function: Maintains outward pressure on the spool tension cap and spacers.
Alternate Part Numbers
This part is a direct replacement for the following Shimano identification numbers found in older or regional schematics:
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BNT1697
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BNT3478 (Superseded by BNT1697/10BRB)
Compatibility & Fitment
The 10BRB (BNT1697) is a standard component for many of Shimano’s most popular medium-to-large capacity round and low-profile reels. It is a direct factory fit for the following models:
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Shimano Calcutta Series: CT-400, CT-400B, CT-400BSV, CT-400S, CT-700
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Shimano Corsair Series: CS-200, CS-200A, CS-300, CS-300A, CS-400, CS-400A
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Shimano Corvalus Series: CVL-200, CVL-300, CVL-301, CVL-400, CVL-401
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Shimano Catala Series: CT-300, CT-400
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Shimano Cardiff Series: CDF-200, CDF-300, CDF-400 (Select older versions)
Pro Tip: During installation, the spring is typically placed inside the cast control cap, followed by the tension spacers (washers). If you have lost your spring, check that the Spool Tension Spacer (BNT1696) is still present, as they often fall out together. For a complete assembly view, download your reel's PDF schematic at www.reelschematic.com.
Key Features
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Consistent Tension: High-memory steel ensures the spring won't "set" or flatten over time.
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Corrosion Resistance: Specially treated for use in both freshwater and harsh saltwater environments.
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Precision Fit: Specifically designed to seat within the internal diameter of Shimano cast control caps without binding.
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Improved Casting: Restores the ability to "fine-tune" your spool, crucial for casting lighter lures.
