Solas 10.3 x 12 Aluminium Propeller for Mercury / Mariner Outboards

Genuine Solas Amita 3 aluminium propeller for selected Mercury and Mariner 18 HP, 20 HP and 25 HP outboards using the 3" gearcase with 10-tooth / 10-spline propeller shaft.

Solas Part Number:

1211-103-12

Specifications:

Diameter: 10.3"
Pitch: 12"
Splines: 10
Blades: 3
Material: Aluminium
Rotation: Right Hand (RH)
Solas Series: Amita 3
Pressed-in hub design
Thru-hub exhaust application

Solas lists 1211-103-12 specifically as its 10.3 × 12 Amita 3 propeller for this Mercury / Mariner 10-spline gearcase family. Solas

Fits Selected Mercury Outboards

18 HP

2 Stroke

1980–1985

20 HP

2 Stroke

1986–2002
10-spline propeller shaft
3" gearcase

25 HP

2 Stroke

1980–2005
10-spline propeller shaft
3" gearcase

Also Fits Selected:

25 HP SeaPro
25 HP Marathon

Solas lists the 25 HP SeaPro / Marathon application across all years within this particular propeller family. Solas

Fits Selected Mariner Outboards

20 HP

2 Stroke

1985 onwards
10-spline propeller shaft
Corresponding 3" gearcase

25 HP

2 Stroke

1985 onwards
10-spline propeller shaft
Corresponding 3" gearcase Solas

Propeller Specifications

Specification	Details
Manufacturer	Solas
Series	Amita 3
Solas Part Number	1211-103-12
Diameter	10.3 inches
Pitch	12 inches
Blades	3
Splines	10
Rotation	Right Hand (RH)
Material	Aluminium
Gearcase	3 inch
Hub	Pressed-In
Exhaust	Thru-Hub

Replaces / Alternative to Mercury Propeller

Mercury / Quicksilver Reference:

48-19639A40
19639A40

Solas cross-reference information identifies 1211-103-12 as the corresponding replacement for Mercury 48-19639A40.

Your original listing also contains 19639A45. I would leave that number out unless it is physically marked on your supplier's packaging, because the reliable Solas/Mercury cross-reference I found specifically supports 48-19639A40.

What Does 10.3 x 12 Mean?

10.3" Diameter

The first number represents the approximate diameter of the propeller.

12" Pitch

The second number represents the propeller pitch.

Pitch is one of the factors affecting engine RPM, acceleration and boat performance.

Do not select a propeller based only on engine horsepower.

The correct pitch depends on the engine, boat, load and operating conditions.

Mercury notes that propeller selection involves more than diameter and pitch, with overall propeller geometry and application affecting performance.

⚠️ Important – Check Your Existing Propeller

Before ordering, please check:

✓ Engine horsepower

✓ Engine year/model

✓ Number of propeller shaft splines

✓ Existing propeller diameter

✓ Existing propeller pitch

✓ Gearcase/application

For this propeller you need the corresponding:

10-SPLINE PROPELLER SHAFT

Do not assume that every Mercury or Mariner 20 HP or 25 HP uses this propeller.

Later and different-generation engines can use completely different propeller shaft and hub arrangements.

Check Your Existing Propeller Markings

If you are replacing an existing propeller, check the numbers stamped or cast into the old propeller.

If your existing propeller is:

10.3 × 12

or the corresponding Mercury:

48-19639A40

this Solas 1211-103-12 is the corresponding 12-pitch replacement application.

Important – Propeller Pitch

Changing from one pitch to another can change engine RPM and boat performance.

For example, if your existing propeller is:

10.5 × 11
10.3 × 12
10.1 × 13

these are not simply interchangeable sizes from a performance perspective.

Solas offers several pitches within this same 10-spline Amita 3 family, including 9", 11", 12", 13", 14" and 15" options.

If you are happy with your engine RPM and boat performance, replacing the old propeller with the same or corresponding pitch is normally the simplest starting point.

Product Features

Genuine Solas propeller
Amita 3
Solas 1211-103-12
10.3" diameter
12" pitch
10 splines
3 blades
Aluminium construction
Right-hand rotation
Pressed-in hub
Thru-hub exhaust
Selected Mercury applications
Selected Mariner applications
Selected 18 HP
Selected 20 HP
Selected 25 HP
Mercury SeaPro / Marathon applications
Alternative to Mercury 48-19639A40
UK stock

Important – Please Check Compatibility

DO NOT ORDER BY HORSEPOWER ALONE.

Mercury and Mariner used different gearcases and propeller shaft arrangements across engines with similar horsepower.

Before purchasing, please confirm:

Engine model
Engine year / serial number
10-spline propeller shaft
Existing propeller size
Existing propeller pitch
Existing propeller part number where available

If the propeller looks the same as yours, this does not always mean it is the correct one for your outboard.

If you are unsure, send SSI Marine your engine serial number and the numbers from your existing propeller, and we will be happy to help.

Why Buy From SSI Marine?

Genuine Solas marine propellers
Workshop-tested products
More than 10 years supplying and servicing outboards
UK stock
Same working day dispatch before 1 PM Monday–Friday
Royal Mail Tracked 24
Technical support from experienced outboard specialists
Collection available from Leigh, Greater Manchester
Workshop open Monday–Friday, 9 AM–5 PM

18 HP 20 HP 25 HP Mercury Mariner Outboard Solas Propeller 10.3 x 12 10 Spline 1211-103-12