Product Description

SHIMANO 101SM REAR PROTECTOR (RD17858)

Shield Your Reel’s Internals

The Shimano 101SM Rear Protector (RD17858) is a genuine OEM body guard designed for the 2016 generation of Shimano Nasci spinning reels. Located at the very bottom of the reel body, this high-impact plastic cap (often called the Rear Shield or Body Guard) serves as the primary armor for the reel's lower frame. It protects the delicate finish and internal oscillation channel from scratches, rock dings, and boat rash during use.

If your current rear protector is cracked, scuffed, or missing, replacing it is crucial to prevent water and debris from entering the reel body. This part comes pre-finished in the factory silver/chrome accent color specific to the Nasci FB series.

Product Specifications

• Part Name: Rear Protector (Body Guard)

• Manufacturer: Shimano

• Part Number (MPN): RD17858

• Schematic Code: 101SM

• Material: Rigid Composite / Plastic (Silver/Chrome Finish)

• Installation Position: Bottom Rear of Reel Body

Compatible Models

This part is engineered for the 4000 and 5000 size bodies of the 2016 Nasci series. It generally does not fit smaller (1000-3000) sizes, which use a different profile.

• Shimano Nasci FB Series (2016 Model):

  • NAS 4000 FB

  • NAS 4000 XG FB

  • NAS C5000 XG FB

  • Note: May fit equivalent sizes in the Sahara FI series (check schematic for part RD18073 or similar if color matches).

Installation & Reference

To ensure this is the correct body guard for your reel, please cross-reference part number RD17858 or the schematic key 101SM with your reel's service diagram.

• Schematic Diagrams: For detailed PDF schematics and part location verification, please visit www.reelschematic.com.

• Alternate Part Number: RD17858

Installation Note: This protector is typically secured by a small screw (often sold separately). When installing, ensure the rubber seal (if equipped on your model) is properly seated to maintain the reel's Core Protect water resistance.