Will you post a conversion chart showing die sizes in awg; american wire guage?

With the supplied dies (16-240mm) you should be able to crimp #4 - 500 MCM. Each individual die incrementally in standard AWG e.g., 16 = #4, 25 = #3 ... 240 = 500 MCM. Hope this helps!

Will this tool work to crimp brass ferrals to hold 1/4 inch air hose to the barbed air hose fittings on my inflator hoses?

The dies do not go that small. To crimp #8 and #6 wire I put two larger dies in backwards, tightened them and drilled a hole between the back side of the two dies for the correct size. This was easy to do and worked well. I assume you can do the same thing for your air hose need. It may take a little experimenting. Good luck

what is the warranty?

Not sure, but I bought mine through the seller "Super buy". There was a non-critical part missing (the spring & ball bearing to keep the pin that holds the dies in place) & they promptly offered to refunded me a few bucks rather than deal with it. I'm quite satisfied with that for a non-critical issue. I'll either live with it, or eventually drill out the hole the pin & bearing fit in & use a cotter pin.

Brand	Goplus
Color	Yellow
Item Weight	11.5 Pounds
Product Dimensions	21"L x 8.5"W
Handle Material	Vinyl
Grip Type	Textured
Manufacturer	Super buy
Part Number	AT3637
Item Weight	11.5 pounds
Item model number	hydraulic wire crimper
Is Discontinued By Manufacturer	No
Material	steel
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

Goplus 16 Ton Hydraulic Crimping Tool, 6 AWG to 600 MCM Battery Cable Lug Terminal Wire Crimper Tool Kit w/ 11 Pairs of Dies

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