The John Deere SST18 mower blade part number found is M127500. The blade set part numbers found are GX22151 and GY20850. The blade measurement captured is center hole 0.81 in (21 mm). The deck uses 2 blades.
John Deere SST18 Mower Blade Size and Part Numbers
| Mower blade part number | M127500 |
|---|---|
| Mower blade set part number | GX22151 and GY20850 |
| Blade center hole size | 0.81 in (21 mm) |
| Number of blades | 2 blades |
| Blade type | high-lift, mulching, standard, and 3-in-1 |
John Deere SST18 Blade Notes
| Blade note | The John Deere SST18 blade listing captured here shows single blade part number M127500, blade set part numbers GX22151 and GY20850, and center hole 0.81 in (21 mm). Use this as a buying guide, then match the blade position, deck size and center-hole style before spending money |
|---|---|
| Deck note | For the John Deere SST18, the captured deck information is blade count 2 blades. Match the blades to the fitted deck, not just the tractor model name |
| Blade type note | The John Deere SST18 blade style captured here is high-lift, mulching, standard, and 3-in-1. Blade type affects airflow and clipping handling, not just cut width |
| Fitment note | Before ordering John Deere SST18 blades, compare the old blade stamp, center-hole shape, blade length and deck size. Close-looking blades can still be wrong |
John Deere SST18 Mower Blade FAQ
Why does the John Deere SST18 blade center hole matter?
The captured center-hole detail is 0.81 in (21 mm). If the hole shape or size is wrong, the blade may not seat correctly on the spindle even if the length looks right
What is the difference between the John Deere SST18 blade number and blade set number?
The captured single blade number is M127500, while the captured blade set number is GX22151 and GY20850. Use the single blade number for one replacement and the set number when replacing the full deck set
Which blade type should you use on the John Deere SST18?
The blade type captured is high-lift, mulching, standard, and 3-in-1. Use that against the captured fitment value M127500. High-lift helps bagging/discharge; mulching blades need the right mulching setup
Mistakes do happen. Blade specs can change by year, mower deck, spindle, serial range and regional parts catalog. Please check the operator manual, old blade stamp, deck tag and official John Deere parts catalog before ordering replacement blades.
