It seems that both SW6710DJ-20 and SW6310S-20 has the correct dimension for Haitian MA2000III/750 injection molding machine,
but the payload of SW6310S-20 is only 3kg while SW6710D-20 is 8kg. Take the weight of the EOAT for pipe fittings into consideration,
for sure
SW6710D-20 would be a much better choice for this project.