Product Description

SHIMANO 10252 CAST CONTROL CAP (BNT5481)

Fine-Tune Your Spool Tension

The Shimano 10252 Cast Control Cap (BNT5481) is the genuine OEM replacement tension knob for the Shimano Tranx 300 and 400 series baitcasting reels. Located on the handle side plate, this cap is the primary interface for adjusting spool tension to control lure drop speed and prevent backlashes.

Whether your original cap was lost on the water or the threads have become stripped from cross-threading, replacing it with this factory-original part ensures a watertight seal and precise adjustment. It features the specific "Tranx Blue/Grey" finish and knurled grip texture to match your reel's original aesthetics and functionality.

Product Specifications

• Part Name: Cast Control Cap (Spool Tension Knob)

• Manufacturer: Shimano

• Part Number (MPN): BNT5481

• Schematic Code: 10252

• Material: Anodized Aluminum / Composite

• Color: Dark Gunmetal / Blue (Tranx A Series Finish)

• Installation Position: Handle Side Plate (over the pinion shaft)

Compatible Models

This part is engineered specifically for the "A" generation (2017/2018) of the Tranx 300 and 400 series.

• Shimano Tranx 300 Series (Right Hand):

  • TRX 300 A

  • TRX 300HG A (High Gear)

• Shimano Tranx 301 Series (Left Hand):

  • TRX 301 A

  • TRX 301HG A (High Gear)

• Shimano Tranx 400 Series (Right Hand):

  • TRX 400 A

  • TRX 400HG A (High Gear)

• Shimano Tranx 401 Series (Left Hand):

  • TRX 401 A

  • TRX 401HG A (High Gear)

Note: This cap is not compatible with the older Tranx 500HG or the newer Tranx 150/200 series.

Installation & Reference

To ensure this is the correct knob for your reel, please cross-reference part number BNT5481 or the schematic key 10252 with your reel's service diagram.

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

• Alternate Part Number: BNT5481

Installation Tip: The Cast Control Cap often houses two small internal components: Spacer A (usually copper/metal) and Spacer B (usually rubber/felt). These spacers are essential for the mechanical brake to function. If you lost your original cap, check if the replacement comes with these spacers; if not, you may need to order them separately (often BNT1696 and BNT2224).