Protect your Mercury investment with genuine OEM parts that last. This WASHER-Special (.375)-Housing Screw delivers years of reliable service – not just one season like cheap alternatives.

Engineered to Mercury’s rigorous OEM standards, this housing assembly ensures reliable operation across all engine RPM ranges. Part number 856774 is manufactured to exact Mercury Marine factory specifications for precision installation and optimal performance. Constructed from premium marine-grade materials designed to withstand harsh saltwater and freshwater environments.

Aftermarket parts might save a few dollars upfront, but genuine Mercury Marine part 856774 saves you money long-term by lasting years instead of months. Factory precision means perfect fit — no modifications, no surprises.

Compatible Mercury Marine Engines

FITS: 100-115HP MARINER, MERCURY, RACE STERNDRIVE (EFI)

• Fits MARINER, MERCURY, RACE STERNDRIVE 100-115HP engines
• Compatible HP: 100HP, 102HP, 107HP, 110HP, 115HP
• Model types: EFI
• Covers 24 serial number ranges
• Configurations: Outboard, Sterndrive
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

100HP Models

• 100HP EFI (Mariner): 0P459572-2B059605, 1B227000-1B366822, 1B366823-2B059605
• 100HP EFI (Mercury): 0P459572-2B059605, 1B227000-1B366822, 1B366823-2B059605
• 100HP OUTBOARD (Mariner): 0D283222-0G760299, 0G760300-0G965520, 0P017000-0P058999, 9793577-0P016999
• 100HP OUTBOARD (Mercury): 0D283222-0G760299, 0G760300-0G965520, 0P017000-0P058999, 9793577-0P016999

102HP Models

• 102HP STERNDRIVE (Race Sterndrive)

107HP Models

• 107HP STERNDRIVE (Race Sterndrive): 0M905359-0M957024, 0M957032-0M962885

110HP Models

• 110HP STERNDRIVE (Race Sterndrive)

115HP Models

• 115HP OUTBOARD (Mariner): 0D283222-0G760299, 0G760300-0T979999, 0P017000-0P325499
• 115HP OUTBOARD (Mercury): 0D283222-0G760299, 0G760300-0T979999

Don’t know where your serial number is? Our quick reference guide shows exactly where to find it on Mercury Marine engines.

Verification & Support

Verify part 856774 works with your Mercury using our parts finder tool. Have questions? Reach out using the contact buttons at the bottom of this page — our team is here to help by text, call, or email

Serving boaters for over 40 years. Competitive pricing, same-day shipping on most orders.