Hitachi part 301806 — Wing bolt M6×15 (genuine Hitachi replacement). Precision wing-style thumb bolt with an M6 metric thread and approximately 15 mm threaded length, featuring a metal threaded shaft and a molded wing head that lets you tighten or release the fastener by hand for quick adjustments on saw bases, fences or router sub-bases. It’s the same style of locking bolt used on many Hitachi / Metabo‑HPT/Hikoki circular and router tools when a secure, tool‑free clamp is required.

Fits a range of Hitachi / Metabo‑HPT (Hikoki) models — examples include C9U2, C7U3, C10FCE2 / C10FCB / C10FCG, M12V and  C6U2 / C7BU2 series circular saws and routers (check your parts diagram for exact placement). These model examples are commonly shown in Hitachi parts lists as using part 301806.

If you need a direct, original Hitachi replacement to restore the adjustment / locking function on your saw or router, this wing bolt matches the factory specification for the models listed above.