Product Description

SHIMANO 101SZ MAIN SHAFT (RD17934)

Restore Your Spool's Vertical Stroke

The Shimano 101SZ Main Shaft is the genuine OEM replacement shaft for the 4000 and 5000 sizes of the 2016 Nasci FB spinning reel series. This stainless steel shaft connects the spool support to the oscillating slider, driving the up-and-down motion of the spool that creates the line lay.

If your main shaft is bent from a heavy drop, or if the threads are stripped preventing the drag knob from tightening, replacing this component is essential. A straight, undamaged main shaft is critical for smooth drag performance and even line distribution.

Product Specifications

• Part Name: Main Shaft

• Manufacturer: Shimano

• Part Number (MPN): 101SZ (Alphanumeric Code)

• Alternate Part Number: RD17934

• Material: Stainless Steel

• Installation Position: Central Body (Runs through Pinion Gear)

Compatible Models

This part is engineered for the 2016 Nasci FB series (Model Code 16NAS). It fits the larger body sizes in this generation.

• Shimano Nasci FB Series (2016):

  • NAS 4000 FB (16NAS4000FB)

  • NAS 4000 XG FB (16NAS4000XGFB)

  • NAS C5000 XG FB (16NASC5000XGFB)

Note: This shaft may also fit corresponding sizes in the Sahara FI series (e.g., SH 4000 FI). Please verify part number RD17934 in your Sahara schematic.

Installation & Reference

To ensure this is the correct shaft for your reel, please cross-reference the alphanumeric code 101SZ or the standard part number RD17934 with your reel's exploded diagram.

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

• Alternate Part Number: RD17934

Installation Tip: When installing the main shaft, you must align it correctly with the oscillating slider (often held by a small screw, e.g., RD14830 or RD17637). Ensure the spool support washers (Click Washer, etc.) are transferred in the correct order to the new shaft to maintain proper line lay height.