10B9W  (RD3177 Key Washer)

Genuine Shimano key washer (part #RD3177, SKU 10B9W) — a small keyed washer that locks internal components in position inside your spinning reel, preventing unwanted rotation under load. This washer engages with a slot or keyway to keep shafts and gears properly aligned during heavy cranking. A worn or missing key washer allows parts to shift, causing play, clicking, or gear misalignment. Cross-references with Shimano part number RD3177. OEM replacement ensures the correct tab profile for secure, rattle-free operation. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano spinning reel parts and expert reel service.