If the social security base in Nantong, Jiangsu is 18,500 yuan, the specific payment amounts for different social insurance types are as follows:

1. Endowment Insurance:

• The unit payment proportion is 16%, so the unit payment amount is ​
  ×16%=
  yuan.

• The individual payment proportion is 8%, so the individual payment amount is ​
  ×8%=
  yuan.

2. Medical Insurance:

• The unit payment proportion is 9%, so the unit payment amount is ​
  ×9%=
  yuan.

• The individual payment proportion is 2%, so the individual payment amount is ​
  ×2%=
  yuan.

3. Unemployment Insurance:

• The unit payment proportion is 0.5%, so the unit payment amount is ​
  ×0.5%=92.5
  yuan.

• The individual payment proportion is 0.5%, so the individual payment amount is ​
  ×0.5%=92.5
  yuan.

4. Work - related Injury Insurance:

• The unit payment proportion varies according to the industry risk level. Assuming a general rate of 0.32%, the unit payment amount is ​
  ×0.32%=59.2
  yuan. Individuals do not pay for work - related injury insurance.

5. Maternity Insurance:

• The unit payment proportion is 0.8%, so the unit payment amount is ​
  ×0.8%=
  yuan. Individuals do not pay for maternity insurance.

In summary, when the social security base in Nantong is 18,500 yuan, the total unit payment amount is ​