The Masport 500 ST S16 takes the Masport swing-back blade and bolt set 783455 (2 blades) as its blade; Australian sellers list it from A$20.83 as of 31 October 2026. Fitment confirmed against the manufacturer's compatibility list.
Your lawn mower
Masport 500 ST S16
Lawn mower
Confirmed against Masport's listConfirmed against Masport's own compatibility list
Not yours? Change
Takes the 783455 blade
swing-back blade and bolt set 783455 (2 blades) · check the code on your old part before ordering.
Takes 2 swing-back blades on its 420 mm flat disc: one set of 783455 (2 blades with bolts) does the job.
Your lawn mower
Lawn mower
Confirmed against Masport's listConfirmed against Masport's own compatibility list
Takes the 783455
Blade · check the code on your old part.
Takes 2 swing-back blades on its 420 mm flat disc: one set of 783455 (2 blades with bolts) does the job.
Other Masport lawn mowers and their blades and parts
The 783455 fits the 500 ST S16 only. These Masport models take a different blade:
GenuineGenuine Masport
$20.83
Power Mowers · 31 OctLowest genuine · Power Mowers · checked 31 Oct
CompatibleCompatible option
See seller
No compatible seller tracked yetNo compatible seller tracked yet
Genuine: made by Masport. Compatible: another brand.Genuine is made by Masport. Compatible is made by another brand. Check the seller's page for the size and models it fits.
Lowest price · $20.83
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AUD, before delivery. Each price shows when it was checked.
Opens Power Mowers in a new tab. Their page is the source of truth for price, delivery and returns.
How long it lasts
Replace it when the blades or bolts are worn or damaged, in sets so the cutter stays balanced, Masport says; check them before each use and whenever the mower hits something or starts to vibrate.
After replacing: No reset needed.
How to change the blade in your Masport 500 ST S16
Watch the guide or follow the steps.
- 1Stop the engine and wait for the blade to stop, then remove the spark plug lead and keep it away from the plug. Wear protective gloves.
- 2Drain the fuel, then tilt the mower with the spark plug uppermost, as the engine book says.
- 3Undo the blade centre bolt and take the blade carrier (disc) off the mower, noting where each part goes.
- 4Undo the tip mounting bolts and fit the new blades with the new bolts, washers and nuts from the set. Replace all the blades on the carrier together.
- 5Refit the carrier so its slots sit over the lugs and the drive plate; replace the mounting bolts if they are worn. Tighten the tip bolts to 20-25 Nm and the centre bolt to 45-50 Nm.
Every number this part goes by
- Retail name:
- 783455
Sellers list any of these; they are the same part.
About your Masport 500 ST S16
Masport lawn mower — President Series 16 (420 mm flat disc). Its blade is the swing-back blade and bolt set 783455 (2 blades), part 783455.
Where the model number is: The model is on the label on the mower's deck or handle. Disconnect the spark plug lead, or take the battery or safety key out, before you tip the mower: the blade is sharp.
Fits this Masport model
Masport1 model
Takes 2 swing-back blades on its 420 mm flat disc: one set of 783455 (2 blades with bolts) does the job.
Common questions
- Which blade fits the Masport 500 ST S16?
- The Masport 500 ST S16 takes the Masport swing-back blade and bolt set 783455 (2 blades). Takes 2 swing-back blades on its 420 mm flat disc: one set of 783455 (2 blades with bolts) does the job.
- Where can I buy the 783455 in Australia?
- We track 1 Australian seller for the 783455; the lowest listed price when we last checked was A$20.83 at Power Mowers. Prices are re-checked daily and dated on this page.
- How do I fit the 783455 in a Masport 500 ST S16?
- 5 steps, listed on this page with the replacement video where the maker has one.
- What happens if I don't change it?
- A blunt blade tears the grass tips, which then brown, and a bent blade makes the mower vibrate and wears the engine or motor.
- Is there anything to reset afterwards?
- No reset needed.
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