Product Description
Shimano 10N48 Handle Screw Cap (RD16361) | Spinning Reel Protective Cover
The Shimano 10N48 Handle Screw Cap (RD16361) is a vital external component for Shimano spinning reels. This cap threads onto the side of the reel housing opposite the handle, serving two primary functions: it protects the handle screw and internal drive gear threads from saltwater and grit, and it provides a balanced, finished aesthetic to the reel's exterior.
Precision-molded from high-impact, UV-stabilized polymer or alloy (depending on the reel series), the 10N48 is designed to be low-profile to avoid line snags while remaining easy to tighten or loosen by hand. It is a common part to lose during transport or while swapping the handle from right-hand to left-hand retrieve.
Product Specifications
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Part Name: Handle Screw Cap / Side Cover Cap
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Shimano Part Number: 10N48
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Alternate Part Number: RD16361
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Material: Reinforced Marine-Grade Polymer
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Thread Type: Shimano Standard Internal Thread
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Function: Seals the non-handle side of the drive shaft housing.
Compatible Reel Models
The 10N48 (RD16361) is used across many of Shimano’s modern freshwater and light saltwater spinning reels. It is a direct fit for the following series:
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Shimano Stradic: FK and FL series (Select sizes).
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Shimano Sahara: FI and FJ series (1000, 2500, 3000, 4000, 5000).
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Shimano Sedona: FI and FJ series (All sizes).
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Shimano Nasci: FB and FC series.
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Shimano Catana: FE series.
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Shimano Nexave: FI series.
Technical Tip: This cap often works in conjunction with a small rubber O-Ring to create a waterproof seal. If your cap is missing, the internal drive gear bearing is at high risk of corrosion. To confirm the exact assembly for your specific model, consult the PDF schematics at www.reelschematic.com.
Maintenance & Protection Recommendation
Because this cap is often removed to switch handle sides, the threads can become caked with salt or sand. To ensure a lifetime of easy removal and a perfect seal, we recommend Deuthlon Lubricants:
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For the Threads: Apply a light film of Deuthlon Reel Gear Grease to the threads of the cap before installation. This high-tack, waterproof grease prevents "cold-welding" (seizing) and blocks moisture from entering the gearbox.
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For the Internal Bearing: While the cap is off, add a single drop of Deuthlon Power Cast Oil to the drive gear bearing visible inside the housing. This ultra-thin oil ensures maximum smoothness without attracting excessive debris.
Why Choose Genuine Shimano 10N48 Parts?
Using the original RD16361 ensures your reel remains "Shimano Smooth" and protected:
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Watertight Seal: Engineered to seat perfectly against the reel frame, preventing internal rust.
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Impact Resistance: Unlike generic 3D-printed caps, the OEM material is designed to take the bumps and knocks of boat decks and rocky shorelines.
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Perfect Thread Match: Eliminates the risk of cross-threading the expensive side plate or drive gear housing.
