AIC Tillage | Plain Concave Disc Blade | 20" x 6.5mm | Replaces John Deere NS90340003 | AICT-0037
AIC Tillage AICT-0037 | 20" x 6.5mm plain concave disc blade with a 4-bolt flat-center mounting design, built as a direct replacement for John Deere OEM NS90340003 for high-speed tillage, shallow tillage, and vertical tillage applications.
This heavy-duty plain concave disc blade is designed for effective soil movement, field finishing, and seedbed preparation in demanding field conditions. The concave profile helps lift and flow soil smoothly, while the plain edge supports uniform tillage action and a cleaner finish in lighter to moderate residue conditions.
The 20" diameter and 6.5mm thickness make this blade a strong fit for modern high-speed discs and high-residue tillage tools where durability, smooth soil flow, and reliable performance are critical. This blade is commonly used across multiple brands when the diameter, thickness, and 4-bolt flat-center mounting pattern match the original blade.
Why plain concave blades?
The concave blade profile helps lift and move soil efficiently for smooth finishing and seedbed preparation, while the plain edge maintains steady ground contact for even tillage performance with less aggressive residue cutting than a notched blade.
Compatibility & Application Notes
- Used on high-speed tillage, shallow tillage, and vertical tillage equipment requiring a 20" x 6.5mm plain concave blade.
- Common fit for machines from multiple manufacturers when matching dimensions and 4-bolt flat-center mounting.
- Always verify blade diameter, thickness, bolt pattern, and mounting dimensions before ordering.
Product Specifications
| Specification | Value |
|---|---|
| Part Number | AICT-0037 |
| OEM Reference |
NS90340003 5NS90340003 |
| Brand | AIC Tillage |
| Disc Type | Plain Concave Disc Blade |
| Diameter | 20" - (508 mm) |
| Thickness | 6.5mm - (approx. 1/4") |
| Mounting Style | 4-Bolt Flat Center |
| Bolt Pattern | 4-bolt mount for compatible flat-center high-speed tillage applications |
| Center Hole | N/A flat-center bolt-on design |
| Application | High-speed tillage discs, shallow tillage, and vertical tillage equipment |
Fits Machine Models
| Brand | Model |
|---|---|
| John Deere |
2680H High-Performance Disc |
| Norwood |
Kwik-Till HSD800, HSD4500 |
| Degelman |
Pro-Till 20, 26, 33, 40 |
| Kinze |
Mach Till 302, 362, 412 |
| Other Applications |
Various high-speed shallow tillage and vertical tillage implements requiring a 20" plain concave 4-bolt disc blade |
Cross Reference
| Brand / System | Part Number | Notes |
|---|---|---|
| John Deere (OEM) |
NS90340003 5NS90340003 |
Primary OEM references for 20" x 6.5mm plain concave blade used on John Deere high-speed discs |
| Norwood |
90-34-0003 18199A, 19028A |
Direct replacement references for Kwik-Till applications |
| Degelman | 143556, 143567 | Common replacement references for Pro-Till high-speed disc systems |
| BTT / Niaux 200 Series |
522-200-1000 | Catalog cross for John Deere 2680H and Norwood Kwik-Till 20" x 6.5mm plain concave blade |
| AIC Tillage | AICT-0037 |
AICT-0037 is the listed AIC Tillage part sold by AftermarketFARM.com, quality-verified for reliable fit, function, and field performance |
| Aftermarket Cross Reference |
RLTS126054 1002701 |
Verified aftermarket part numbers shown for cross-reference and identification purposes. Manufacturing standards and quality may vary by supplier. Verify blade diameter, thickness, and mounting pattern before ordering |