This blade says to use it no faster than 1800 RPM, my Porter Cable saw is 3800 RPM. So does everybody ignore that detail?

NO! Do not ignore that detail! If blade lifespan is important to you then use the 1300 RPM saw that it is designed for. They will last many months and I make thousands of cuts into multiple pieces at a time. If you use the ordinary chop saws intended for high RPM abrasive discs you can count the number of days it will last on your fingers...kind of a shame when they are $125 each and a disc is $10.

Can i use this on a dewalt chop saw that comes with a fiber disk ???? size and rpms match ??????

No, this would not be compatible; Use only TYPE 1 cutting wheels with Chop Saw: https://www.dewalt.com/products/accessories/abrasives/bonded-abrasives?Facet2=Diameter%253b%253b14-s-in%253b%253b14%7C&pageNum=1

What is the maximum thickness of iron rod this will cut? i need to cut 1" square rod.

It will cut 1 inch square solid Rod no problem. The secret to success with this blade is to feed it very very gently especially at the start of the cut. Then gentle pressure and it will cut the metal perfectly.

does this blade have a diamond knockout?

No. The DWA7747 does not have a diamond knockout.

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⚡ Cut like a pro, last like a legend.

MADE IN THE USA - Crafted with pride and precision, ensuring top-tier quality for professional-grade projects.
BUILT TO OUTLAST - Tri-foil braze technology absorbs stress, extending blade life beyond the competition.
RESHARPEN REUSE - Designed for easy tooth resharpening, maximizing your investment and minimizing downtime.
COOL UNDER PRESSURE - Expansion slots efficiently dissipate heat, preventing warping during intense cutting sessions.
UNMATCHED CUTTING PRECISION - 66 heavy-gauge teeth engineered for burr-free, ultra-smooth metal cuts.

The DeWalt DWA7747 14" 66-tooth heavy-gauge ferrous metal cutting saw blade features 12% titanium carbide construction, tri-foil braze tips, and heat-dissipating expansion slots. Designed for clean, burr-free cuts and extended durability, it supports up to 1,200 cuts at 1800 rpm and is compatible with DW872 Multi-Cutter Saws. Made in the USA, this blade is a must-have for professionals demanding precision and longevity.

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Material	Titanium Carbide
Brand	DEWALT
Product Dimensions	14"L x 14"W
Color	Multi
Number of Teeth	66
Style	66-Tooth
Item Weight	4.23 ounces
Compatible Material	Metal
UPC	028874077478
Global Trade Identification Number	00028874077478
Manufacturer	DEWALT
Part Number	DWA7747
Item Weight	4.2 ounces
Item model number	DWA7747
Is Discontinued By Manufacturer	No
Size	14-Inch
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Power Source	Hand Powered
Voltage	120
Item Package Quantity	1
Number Of Pieces	1
Included Components	DWA7747 - 14IN 66 Tooth Metal Cutting Blade with 1IN Arbor
Batteries Included?	No
Batteries Required?	No

DeWalt DWA7747 14" 66T Heavy-Gauge Stiff Plate Ferrous Metal Cutting Saw Blade

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