The small hardware you ignore is often the first to fail—unless it’s a Mercury Stainless-Steel Washer (12-8M0204648). Cut to a generous 1.50" ID × 3.05" OD and 0.13" thick, this heavy-gauge spacer sits under the engine-mount nuts on late-model V-6 and V-8 FourStroke outboards, spreading clamping force so your mount pads stay tight and your transom stays quiet.

Forged from 316 stainless and polished to a mirror sheen, the washer laughs at salt spray, road grime, and the galvanic buzz that chews up plain steel. A deburred edge protects paint and gelcoat, while the flat-ground faces keep torque readings true—no springy flex, no creeping fasteners after a weekend of chop.

Why swap in genuine Mercury hardware?

• Exact OEM dimensions—slides over 1-1/2" studs without slop, seats flush in mounting pockets.

• Corrosion armor—316 stainless resists pitting, staining, and electrolysis attack.

• Even load distribution—protects rubber isolators and prevents bolt-head dig-in.

• Sold individually—order the exact count you need for single fixes or full-mount freshen-ups.

Whether you’re repowering, chasing a mystery rattle, or buttoning up a full rebuild, this simple washer delivers the rock-solid foundation your Mercury deserves—because big horsepower needs small parts that won’t back down.