Description

Mercury MerCruiser Quicksilver 10-28635 is a genuine Mercury Marine stainless steel screw used across a wide range of Mercury, Mariner, MerCruiser, Bravo, Alpha, transom, outboard, and high-performance drive assemblies. Mercury parts references identify this fastener as SCREW (.250-20 x .620) St, meaning it is a 1/4″-20 stainless steel screw with a .620 in. length for supported diagram locations.

Key Features

• Genuine Mercury Marine / Quicksilver screw reference
• Stainless steel construction
• Thread specification: .250-20 / 1/4″-20
• Length reference: .620 in.
• OEM part number: 10-28635
• Base part reference: 28635
• GTIN / UPC reference: 745061133068
• Catalog package reference: approximately 1.70 in. x 1.70 in. x 0.50 in.

Engine Compatibility

This screw is used across many Mercury and MerCruiser application groups depending on the exact diagram location. References show use in select Mercury / Mariner outboards, R/MR/Alpha One, Alpha One Gen II, Bravo One / Two / Three, Bravo X / XR / XZ, Blackhawk, Vazer, NXT, SSM, integrated transom assemblies, high-performance transom assemblies, and various older MerCruiser GM/Ford engine and inboard applications.

Serial Number Fitment Notice

Hardware fitment depends on the exact engine, drive, transom assembly, cowling, bracket, housing, or component group and the specific parts diagram callout. Always confirm compatibility using the Mercury or MerCruiser serial number and diagram location before ordering, especially because 10-28635 appears across many different assemblies.

When This Part Needs Replacement

Replace this screw if the original is missing, corroded, rounded, cross-threaded, stripped, seized, bent, or damaged during removal. Stainless fasteners should also be replaced when the threads no longer hold proper torque or when the screw head can no longer be tightened cleanly.

Installation Notes

Confirm the screw’s exact position in the Mercury parts diagram before installation. Match it with the correct washer, nut, bracket, housing, or mating threaded component for the assembly being serviced, and tighten according to the Mercury service manual for that specific location. Avoid substituting generic hardware unless the thread, length, material, and application requirements are confirmed.

Alternate/Superseded Part Numbers

• 10-28635
• 28635
• Mercury Marine 28635
• Quicksilver 10-28635
• 10-20146 — earlier superseded reference in supported applications

Parts Desk Insight

This is a broad-use Mercury stainless screw, so the safest match is the exact diagram callout rather than engine size or drive family alone. The 1/4″-20 thread and .620 in. length matter, but location matters just as much because this screw appears in many different Mercury and MerCruiser assemblies.

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