For giggles I compared the 25mm2 terminals:
Aliexpress SC25-6: sleeve for wire: ID 7,36 mm and OD 9,00 mm, Wall thickness 0,82 mm
Industrial "tubular cable terminal" ID 6,98 mm OD 10,05 mm, wall thickness 1,54
For crimping I used Chinese HX-50B crimper https://www.amazon.com/s?k=hx-50b&ref=nb_sb_noss_2
Aliexpress connector crimped with 25mm2 dies:
Looks loose and almost falls off by itself, I could easily pull it out with 2-finger grip. No point of further testing.
Industrial one looks much better but still bit under-crimped to my eye:
In pull test can easily hold 80kg/ 180 lbs and would pass the tensile test requirements for UL485A and ABYC standards.
OK, the Aliexpress special was obviously loose crimp so lets try 16mm2 dies:
Ugly as hell but holds over 180 lbs in tensile test. With added leverage a Tug-of-war between terminals results in the "industrial" terminal to slip off the cable.
As a rough estimate this took over 300 lbs.
Second round with the "industrial" terminal crimped from 2 directions: Aliexpress special breaks off between the ring and the crimp sleeve.
My set was from aliexpress but similar kits are also available for example from Amazon:
What did we learn? Dunno about else but TEST your tool/crimp combination before use!
Aliexpress SC25-6: sleeve for wire: ID 7,36 mm and OD 9,00 mm, Wall thickness 0,82 mm
Industrial "tubular cable terminal" ID 6,98 mm OD 10,05 mm, wall thickness 1,54
For crimping I used Chinese HX-50B crimper https://www.amazon.com/s?k=hx-50b&ref=nb_sb_noss_2
Aliexpress connector crimped with 25mm2 dies:
Looks loose and almost falls off by itself, I could easily pull it out with 2-finger grip. No point of further testing.
Industrial one looks much better but still bit under-crimped to my eye:
In pull test can easily hold 80kg/ 180 lbs and would pass the tensile test requirements for UL485A and ABYC standards.
OK, the Aliexpress special was obviously loose crimp so lets try 16mm2 dies:
Ugly as hell but holds over 180 lbs in tensile test. With added leverage a Tug-of-war between terminals results in the "industrial" terminal to slip off the cable.
As a rough estimate this took over 300 lbs.
Second round with the "industrial" terminal crimped from 2 directions: Aliexpress special breaks off between the ring and the crimp sleeve.
My set was from aliexpress but similar kits are also available for example from Amazon:
Glarks 65Pcs Assorted Heavy Duty Wire Lugs Battery Cable Tinned Copper Eyelets Tubular SC Ring Terminals Connectors with Spy Hole Assortment Kit: Amazon.com: Industrial & Scientific
Glarks 65Pcs Assorted Heavy Duty Wire Lugs Battery Cable Tinned Copper Eyelets Tubular SC Ring Terminals Connectors with Spy Hole Assortment Kit: Amazon.com: Industrial & Scientific
www.amazon.com
What did we learn? Dunno about else but TEST your tool/crimp combination before use!
you get different results.. 
