Set Screw – Fits Mercury, MerCruiser, and OMC Marine Engines (Replaces 10-20518, 8M0204644)
Set Screw – Fits Mercury, MerCruiser, and OMC Marine Engines (Replaces 10-20518, 8M0204644) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Set Screw – Fits Mercury, MerCruiser, and OMC Marine Engines (Repla...
Product Details
This replacement Cable Anchor Set Screw is designed for a wide array of Mercury, MerCruiser, and OMC marine engines. It is used as a critical mechanical fastener to secure throttle and shift cables within control boxes and transom assemblies on systems manufactured from 1962 to the present day.
This part directly interchanges with several OEM and aftermarket numbers, including Mercury 10-20518/8M0204644, OMC 912304/915918, Sierra 18-2303, and GLM GLM21433.
- Installs as a standard #8-32 thread mechanical fastener.
- Secures throttle and shift cables in various marine controls and transom assemblies.
- Constructed from durable steel for reliable performance in marine conditions.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury | 10-20518 | 8M0204644 | |
| Mercury | 8M0204644 | Current Part Number | |
| OMC | 912304 | 915918 | |
| OMC | 915918 | Current Part Number | |
| Sierra | 18-2303 | Aftermarket Replacement | |
| GLM | GLM21433 | Aftermarket Replacement |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury and MerCruiser models, this set screw is used in numerous applications from 1962 to present. Verify your specific model and year from the lists.
For OMC applications, this part is primarily used in Cobra transom shield assemblies from 1986–1993.
Mercury Outboard Applications
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 30 JET | 30 | 2-Stroke | 1995 and up | 10-20518 | Superseded by 8M0204644 |
| Mercury | 35 | 35 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 40 JET | 40 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 40-50 (2 & 4 Cyl) | 40-50 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 45 JET | 45 | 2-Stroke | Multiple series | 10-20518 | Superseded by 8M0204644 |
| Mercury | 50-60 (3 Cyl) | 50-60 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 55-60 (3 Cyl) | 55-60 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 65 JET | 65 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 70-90 (3 Cyl) | 70-90 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 75-90 (3 & 4-Stroke) | 75-90 | 2- & 4-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 80-90 JET | 80-90 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 100-125 (4 Cyl) | 100-125 | 2-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | 115 (4 Cyl & EFI) | 115 | 2- & 4-Stroke | Multiple years | 10-20518 | Superseded by 8M0204644 |
| Mercury | Mark 75 | 75 | 2-Stroke | All years | 10-20518 | Superseded by 8M0204644 |
MerCruiser Sterndrive & Transom Applications
| Brand | Model | Type | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | Alpha One (Gen. II) | Sterndrive | 1991–1998 and up | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | R/MR/Alpha One | Sterndrive & Transom | 1983–1990 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Bravo (All variants) | Sterndrive | Multiple years | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Bravo X (One, Two, Three) | Sterndrive | Multiple years | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Bravo XR (One, Three) | Sterndrive | Multiple years | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Bravo XR Sportmaster | Sterndrive | Multiple years | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Bravo XZ One | Sterndrive | Specific range | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Hi Performance Transom | Transom | Various | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Integrated Transom | Transom | Various | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | Alpha One SS | Sterndrive | 1986–1989 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | SSM II/III/IV/V | Sterndrive | 1982–1995 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | II (1.78:1) | Sterndrive | 1968–1969 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | II | Sterndrive | 1962–1967 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | VAZER Drive & Transom | Drive & Transom | Various | 10-20518 | Superseded by 8M0204644 |
MerCruiser Inboard Applications
| Brand | Model | Engine | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | 120/140 | Inboard | 1967–1982 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 160/165 | Inboard | 1967–1981 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 225-S | Inboard | 1974 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 228 | Inboard | 1978–1982 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 233 | Inboard | 1975–1977 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 250 | Inboard | 1977 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 260 | Inboard | 1978–1982 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 470 | Inboard | 1976–1982 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 485 | Inboard | 1980–1982 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 888 | Inboard | 1971–1977 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 898 | Inboard | 1977–1982 | 10-20518 | Superseded by 8M0204644 |
| MerCruiser | 898/228 | Inboard | 1977 | 10-20518 | Superseded by 8M0204644 |
OMC Applications
| Brand | Model | Type | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| OMC | Cobra | Transom shield | 1986–1993 | 912304 | Also listed as 915918 |
Control Component Applications
| Brand | Component | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| Mercury | Remote Controls and Components | 1986–1993 | 10-20518 | Used in throttle cable anchor |
| Mercury | Remote Controls and Components | 1994 and up | 10-20518 | Used in throttle cable anchor |
| Mercury | Remote Controls and Components | 1985 and below | 10-20518 | For Mercruiser and Outboard |
Technical Specs
- Product Type
- Cable Anchor Set Screw
- Installation
- Mechanical fastener
- Thread Size
- #8-32
- Material
- Steel
- Color
- Metallic
- Package Dimensions
- 0.5" L x 4.0" W x 5.13" H
What’s in the Box
- 1 x Set Screw (Replaces 10-20518 / 8M0204644)
Installation Notes
- Ensure the engine is off and the battery is disconnected for safety.
- Locate the existing set screw on the throttle or shift cable anchor point within the remote control or transom assembly.
- Carefully remove the old set screw using an appropriate tool.
- Align the cable end and anchor and thread the new set screw by hand to prevent cross-threading.
- Tighten the screw firmly until the cable is secure. Do not over-torque, as this can damage the threads or cable.
- Reconnect the battery and test the throttle/shift control for smooth and correct operation before use.
Troubleshooting & FAQ
How do I know if this set screw is the right one for my engine?
This part fits a very wide range of Mercury, MerCruiser, and OMC models. The best way to confirm is to check the compatibility tables on this page against your engine's model and year. You can also verify by matching the OEM part number (e.g., 10-20518, 8M0204644, 912304) from your service manual.
What are the signs of a failing or missing set screw?
A loose, worn, or missing set screw can cause sloppy or unresponsive throttle and shift controls. You might experience difficulty shifting gears, a throttle that doesn't hold its position, or a complete loss of control cable function.
What is the thread size of this screw?
This set screw features a standard #8-32 thread size, common in many marine control cable applications.
Is this a direct replacement for OMC part 912304?
Yes, this part is a direct aftermarket replacement for OMC part number 912304 and its successor, 915918, used in Cobra transom shields from 1986–1993.
When should this part be replaced?
Replace this set screw whenever you are replacing the control cables, if the old screw is stripped or corroded, or if it can no longer be tightened securely. Regular inspection during maintenance is recommended.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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