Batch Hardness TestedExporting to 30+ countriesHS Code 820840000

Replaces OEM GX21784 (Mulching)

Factory code GX21784 — made in our own plant from 65Mn manganese steel, heat-treated cutting edge, batch hardness tested at 45–50 HRC.

Replaces OEMGX21784
Deck size42"–48"
Center hole7-point star
Thickness5/32"(4mm)
Pack optionsPer carton
Min. order300 pcs
Replacement mower blade for OEM GX21784
Detail photo 2 for OEM GX21784
Detail photo 3 for OEM GX21784

All photos are of the actual part — including our production photo and reference shots from the OEM application. Brand and model names are for fitment reference only.

Specifications

Part Specification

Material65Mn manganese steel
Hardness45–50 HRC
Deck size42"–48"
Center hole7-point star
Air lift1-3/16"(30mm)
Blade typeMulching
ApplicationLawn tractor
Length17-1/8"(435mm)
Width2-3/4"(70mm)
Thickness5/32"(4mm)
Inner boxPer OEM reference
CartonPer OEM reference
Min. order300 pcs / SKU
Cross-reference

Replaces these part numbers

GX21784GY20852AM137757AM141035
Fitment

Which machines it fits

Type your mower model below to confirm this blade fits — before you enquire.

24 of 24 models
D140E140D160E170D150D155E150E160L120LA130LA140LA145LA155LA165S140S160S170X140X165X166X167Z245Z255Z355E
Notes for buyers

Fitting & compatibility notes

  • Stop the guesswork! John Deere 48" Deck Zero Turn Mower uses two different blade types.Before ordering our blades,identify your original blade's Mounting Pattern.Our blade's Mounting Pattern is 7 Star Shaped.If your blade's Mounting Pattern is Circle Shaped,use MPN M145476 GY20568 to order your correct blades elsewhere.
  • Fits For 48 Inch Mower Blades, Replaces Number: John Deere GX21784 GY20852 AM137757 AM141035.
  • Fits For John Deere Mower Blades 48 Inch Deck, Compatible with 145 155C D140 D150 D155 D160 E140 E150 E160 E170 L120 LA130 LA140 LA145 LA155 LA165 S140 S160 S170 X140 X165 X166 X167 Z245 Z255 Z355E Lawn Tractor.
  • NOTICE: The cutting edges are painted to prevent rust and protect your hands during installation. The paint will wear off as you mow the grass.
  • ENSURE SUPERIOR PERFORMANCE: we conduct a series of rigorous tests, including the Rockwell Hardness Test, V-bend Test, Blade Chip Test, Balance Test, Performance Test, and Field Test.
Same deck size

Other blades for 42"–48" decks

Buyers servicing mixed fleets usually order these together.

Need a Different Spec?

Send your sample, drawing or part number — quote within 48 hours, including tooling cost for new profiles.