Product Description
Shimano 10EW3 Drag Spring Washer (8L) (BNT1613 & TGT0358)
The Shimano 10EW3 Drag Spring Washer, also known as a Belleville Washer, is a conical spring disc used to manage and calibrate the pressure applied to the drag stack. In Shimano's technical catalogs, it is identified as part BNT1613 for baitcasting reels and TGT0358 for conventional/trolling reels.
Unlike a standard flat washer, this part is slightly curved. When the star drag or lever is tightened, these washers flatten out, providing a high amount of spring tension in a very compact space. This tension is what allows for the fine-tuning of drag settings; without these "spring" washers, the drag would jump from "totally loose" to "completely locked" with almost no middle ground.
Product Specifications
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Part Name: Drag Spring Washer (8L) / Belleville Washer
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Part Numbers: 10EW3
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Shimano Codes: BNT1613 / TGT0358
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Material: High-Elasticity Tempered Steel
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Shape: Conical / Cupped
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Function: Provides mechanical spring tension to the drag stack for incremental adjustment.
Alternate Part Numbers
This part is a universal standard across multiple Shimano categories:
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BNT1613 (Baitcasting/Freshwater)
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TGT0358 (Conventional/Saltwater)
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RD0713 (Found in select older spinning reels)
Compatibility & Fitment
Because of its standardized "8L" size, this washer is found in hundreds of Shimano models across several decades. It is a direct factory fit for:
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Shimano Curado Series: CU-200B, 200DPV, 200E, 200G, 200K
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Shimano Calcutta Series: CT-50, 100, 200, 400, 700 (including B, D, and Conquest models)
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Shimano Tekota Series: TEK-300, 500, 600, 700, 800
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Shimano TLD Series: TLD-5, 10, 15, 20, 25 (Star and Lever Drag)
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Shimano Torium & Trinidad: All legacy and HG models
Key Features
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Incremental Adjustment: Allows the angler to make micro-adjustments to the drag pressure during a fight.
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High Load Capacity: Designed to maintain its "spring" even when compressed under the maximum drag ratings of offshore reels.
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Compact Design: Provides significant force without adding the bulk of a traditional coil spring.
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Direct OEM Precision: Guaranteed to have the correct inner diameter (I.D.) to fit snugly over the drive shaft without wobbling.
Critical Installation Tip: The "() " Orientation
In most Shimano reels, these washers are used in pairs (two washers). Their orientation is vital to how the drag feels:
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Opposing ( ) or )( : This is the factory standard. Placing the "cups" facing each other provides the maximum range of adjustment and a "softer" drag curve.
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Nested (( or )) : This increases the total drag pressure but significantly reduces the range of adjustment (the drag will get tight very quickly).
Pro Tip: If your star drag feels "mushy" or you can no longer get full drag pressure, check these washers for cracks or "flattening." Over time, they can lose their spring memory and stay flat, requiring replacement. You can verify the exact stack sequence for your model at www.reelschematic.com.
