Replacement disc blades that fit the Kelly Engineering Diamond 40 Chain Harrow (Disc). In stock, ships from Ames, Iowa. Free shipping on orders $600+. Call the concierge line at 515-686-5575 with your serial number if you're not sure which blade you need.
Kelly Engineering Diamond 40 blade fitment at a glance
- Machine family: Chain Harrow (Disc)
- Common blade sizes: 16", 17", 18"
- Edge configuration: notched (aggressive residue-cutting front-gang blades)
- Typical axle bore: 1" round
Shop Kelly Engineering Diamond 40 blades by size
- 16" blades — in stock
- 18" blades — in stock
Ordering the right blade for your Kelly Engineering Diamond 40
To be certain the blade you order fits, verify three specs on your worn blade before ordering:
- Outside diameter — measure across the full width of the blade in inches. Blades wear from the outside in, so measure a low-wear reference blade if possible.
- Axle bore — 1" round is standard for the Kelly Engineering Diamond 40, but confirm on your machine.
- Edge profile — notched (aggressive residue-cutting front-gang blades). Match what came off, unless you're intentionally changing edge to change residue behavior.
If any of those are unclear, call 515-686-5575 and we'll match a blade from stock.
Other Kelly Engineering models we cover
Related resources
- Kelly Engineering tillage blades
- All disc blades for sale — full catalog
- How to size disc blades — blade sizing guide
- Notched vs. smooth disc blades
- When to replace disc harrow blades
Frequently asked questions
What size disc blades fit the Kelly Engineering Diamond 40?
The Kelly Engineering Diamond 40 (Chain Harrow (Disc)) typically runs 16", 17", 18" blades depending on the gang and configuration. Confirm by measuring the outside diameter of a worn blade on your machine, or call 515-686-5575 with your model serial and we'll match it.
Are these OEM Kelly Engineering blades?
No — these are premium replacement disc blades manufactured to fit the Kelly Engineering Diamond 40. They match OEM dimensions, edge profile, and axle bore, and are drop-in replacements. DiscBladesForSale.com is not affiliated with Kelly Engineering.
What edge should I use — notched or smooth?
On a chain harrow (disc) like the Kelly Engineering Diamond 40, the standard configuration is notched (aggressive residue-cutting front-gang blades). If you're running heavy corn stalks or no-till, run notched on the front gangs. If soil finish matters more than residue cut, run smooth.
DiscBladesForSale.com is not affiliated with, endorsed by, or sponsored by Kelly Engineering. "Kelly Engineering" and "Diamond 40" are trademarks of their respective owners, referenced here only to describe blade fitment.