PRODUCT DETAILS
Propeller Spacer / Washer for Mercury Mariner Outboards & MerCruiser Sterndrives
Marine-grade aftermarket propeller spacer / washer for selected Mercury and Mariner outboards and MerCruiser sterndrive applications.
Suitable for selected 15-spline propeller shaft applications using the corresponding propeller and hub arrangement.
Fits Selected Mercury & Mariner Outboards
Suitable for selected:
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135 HP
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150 HP
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175 HP
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200 HP
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225 HP
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250 HP
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275 HP
Engine Type
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V6
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2 Stroke
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Selected 15-spline propeller shaft applications
Important – Propeller / Hub Type
This spacer is primarily used with the appropriate rubber-hub / non-Flo-Torq II propeller arrangement.
Fitment is determined by the gearcase and propeller hub system, not horsepower alone.
Fits Selected MerCruiser Sterndrives
Also suitable for selected:
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MerCruiser I
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MerCruiser R
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MerCruiser MR
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MerCruiser Alpha One
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MerCruiser Alpha One Gen II
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Selected MerCruiser Bravo I applications
Please check your existing propeller hardware and original part number before ordering.
Replaces Mercury / Quicksilver Part Numbers
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12-31211Q03
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31211Q03
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12-31211A2
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31211A2
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12-31211A3
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31211A3
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12-31211K03
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31211K03
OEM part numbers are used for identification and reference purposes only.
Product Features
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Propeller spacer / washer
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For selected Mercury & Mariner outboards
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135 HP, 150 HP, 175 HP, 200 HP, 225 HP, 250 HP & 275 HP
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Selected V6 2-stroke applications
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Selected 15-spline propeller shaft applications
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Also fits selected MerCruiser sterndrives
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Marine-grade quality aftermarket part
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Manufactured to OEM specifications
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New replacement part
Important – Please Check Compatibility
Please do not order by horsepower or appearance alone.
Mercury and Mariner engines can use different propeller hardware depending on the gearcase, propeller and hub system.
Before purchasing, please check:
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Engine model
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Engine serial number
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Gearcase
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Propeller type
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Hub system
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Existing spacer / washer
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Original part number
For the safest identification, check that your existing propeller hardware corresponds to 12-31211Q03 / 31211A2 / 31211A3 / 31211K03.
If you are unsure, please contact SSI Marine with your engine serial number and propeller details before purchasing.
Why Buy From SSI Marine?
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Marine-grade aftermarket & OEM-spec parts
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Workshop-tested products
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More than 10 years supplying outboard parts
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UK stock
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Same working day dispatch before 1 PM Monday–Friday
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Royal Mail Tracked 24
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Technical support from experienced outboard specialists
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Collection available from Leigh, Greater Manchester
SHIPPING & DELIVERY
Delivery & Returns Policy
Delivery
Standard Delivery
- £6: Royal Mail Tracked 24 Service
- £3.99: Large Letter - Royal Mail 1st Class Post (Untracked)
We offer free delivery on all orders over £150 (excludes outboard engines).
Orders placed before 1:00 PM (Monday-Friday) are usually dispatched the same working day.
Most parcels are delivered within 24 hours, but please allow extra time for courier delays that may occur outside our control.
For outboard engines, please contact us for a delivery quote.
Important: Please ensure your shipping address is correct before completing checkout. SSI Marine is not responsible for parcels sent to an incorrect address provided by the buyer.
Tracking Your Order
Once your order has been dispatched, you will receive a tracking number via email (after 5 PM on the day of dispatch).
Tracking is available only for parcels sent via Royal Mail Tracked 24.
Large Letter orders are sent via Royal Mail 1st Class Post (untracked).
Returns
We accept returns of unused and undamaged items within 30 days of purchase.
Returned items must be in sellable condition and include the original packaging.
Please do not tape, label, or write directly on the product's original box.
Important: Do not return items in their original product boxes only, they must be placed inside a protective outer box or bag. Parcels returned like the example below will be subject to a 20% restocking fee.
Return shipping costs are the customer's responsibility.
Please include your order details and reason for return inside the parcel.
Refunds
Refunds are issued for the item purchase price only (shipping costs are non-refundable).
All refunds will be made using the same payment method as your original order.
Items returned in poor condition or without proper packaging may incur a 20% restocking fee.
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