10L4Z  (TGT0290  Key Washer C)

Genuine Shimano Tiagra key washer C (part #TGT0290, SKU 10L4Z) — a keyed anti-rotation washer that locks internal components in proper alignment within the Tiagra's gear housing. The key tab seats into a machined slot, preventing the washer from spinning under load and maintaining critical spacing between moving parts. When key washers wear or their tabs break, components can shift out of alignment, leading to gear noise, premature wear, and reduced drag efficiency. Cross-references with Shimano part number TGT0290. OEM replacement preserves factory tolerances and reliable performance. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano Tiagra trolling reel parts and expert reel rebuilds.