The John Deere LA120 mower blade part number found is GY20850. The blade set part number found is GY20850. The blade measurement captured is thickness 0.187 in (5 mm) and center hole 0.81 in (21 mm).
Blade part #GY20850
Blade set part #GY20850
Blade sizethickness 0.187 in (5 mm) and center hole 0.81 in (21 mm)
John Deere LA120 Mower Blade Size and Part Numbers
Mower blade part number
GY20850
Mower blade set part number
GY20850
Blade thickness
0.187 in (5 mm)
Blade center hole size
0.81 in (21 mm)
Blade type
high-lift, mulching, and bagging
Blade Size Comparison Chart
Blade thickness comparison
This model
0.187 in
Average
0.188 in
Low
0.125 in
High
0.25 in
John Deere LA120 Blade Notes
Blade note
The John Deere LA120 blade listing captured here shows single blade part number GY20850, blade set part number GY20850, and thickness 0.187 in (5 mm) and center hole 0.81 in (21 mm). Do not buy purely from model name if the mower deck or serial range is different
Blade type note
For the John Deere LA120, blade type is listed as high-lift, mulching, and bagging. Pick the blade style for the job: clean discharge, bagging lift, or mulching
Fitment note
For the John Deere LA120, use the listed specs as a buying guide, but confirm against the operator manual, parts diagram or old blade before ordering
John Deere LA120 Mower Blade FAQ
Can you modify a John Deere LA120 blade center hole to fit?
Do not do that. The captured center-hole detail is 0.81 in (21 mm). Grinding or drilling a mower blade can ruin balance and create vibration
Can you swap John Deere LA120 blade types?
The blade type captured is high-lift, mulching, and bagging. You can often choose a different style only if it fits the same deck and spindle setup. Use GY20850 as the fitment starting point
Official information note
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.
