Review on 🔍 SEO Optimized: POWERTEC 6" HSS Jointer Knives Replacement for Delta 37-658 37-190 37-195 37-205 37-220 37-275X, JET 708457K JJ-6CS - Set of 3 by Mike Bogan

I bought 148030 HSS blade for my Delta 37-190. Then I saw that 148031 was cheaper and bought them too just in case.I took out the old triangular blades and was about to install 148030 when I noticed the concavity of the new blades so I returned them.I also received 148031 and the flatness of those blades checked and the two sets I bought were concave I ordered a new set 148030 and they lay flat on the bed and I installed them and they work fine I don't know what the difference is between 148030 and 148031? have measured both with a micrometer and they are equivalent Can't tell if the blades have different hardness Seems to be an issue that others have found In general however I have used the blades on mine for hardwood and softwood at over 100 baud feet and they work well. So 4 stars after receiving the set which was flat