Replaces OEM GY20850
Factory code GY20850 — made in our own plant from 40Mn manganese steel, heat-treated cutting edge, batch hardness tested at 45–50 HRC.
Photos are of our own production parts — the same blades we supply through our retail programme. The dimension drawing is generated from the published specifications. Brand and model names are for fitment reference only.
Part Specification
| Material | 40Mn manganese steel |
| Hardness | 45–50 HRC |
| Deck size | 42" |
| Center hole | 7-point star |
| Air lift | 1"(25mm) |
| Blade type | Mulching |
| Application | Lawn tractor |
| Length | 21-3/8"(543mm) |
| Width | 2-1/2"(63.5mm) |
| Thickness | 13/64"(5mm) |
| Inner box | 560*80*40 |
| Carton | 575*180*145 |
| Carton qty | 6 sets / carton |
| Pack weight | 2.81 kg |
| Min. order | 300 pcs / SKU |
Pricing is quoted per order — FOB / CIF / DDP by quantity and destination port. Ask for volume price breaks with your enquiry.
Cross-referenceReplaces these part numbers
Which machines it fits
Type your mower model below to confirm this blade fits — before you enquire.
Fitting & ordering notes
- Check the centre hole first. This blade mounts on a 7-point star spindle — if the hole pattern on your old blade differs, it will not seat.
- Packaging. Ships in MowForge export packaging marked with our code GY20850 — the cross-reference numbers above are for ordering convenience only.
- Finish. Cutting edges arrive with a protective paint coating for sea freight and handling; the coating wears off after the first few mows.
- Quality records. Every batch is hardness-sampled into the 45–50 HRC window and dimension-inspected before packing — inspection records ship with the order on request.
- OEM/ODM. Laser marking, private labels and retail or bulk packaging are available on this part.
Get a price for this blade
Send your quantity and we reply within 48 hours with price, MOQ and lead time.
Need a Different Spec?
Send your sample, drawing or part number — quote within 48 hours, including tooling cost for new profiles.
Questions buyers ask about this blade
Will this blade fit my mower?
It fits John Deere machines with 42" decks, including D130, S100, D105, D110 and others. The center hole is 7-point star, so check your spindle pattern matches before ordering.
Which part numbers does it replace?
It is a direct replacement for GY20850, AM137327, AM141033, GX22151.
What steel and hardness is it made to?
40Mn steel, hardened to 45-50 HRC. Batch hardness testing runs in-house and a material certificate ships with the order.
What is the minimum order quantity?
300 pcs per part number. Standard sizes go through our normal production window; non-standard sizes are quoted against your drawing.