Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_50 (body_width_mm VARCHAR, body_length_mm VARCHAR, pins VARCHAR)

### Question ###
How much Body Width/mm has a Body Length/mm of 18.4, and Pins of 40?

### Accurate SQL ###

SELECT COUNT(body_width_mm) FROM table_name_50 WHERE body_length_mm = 18.4 AND pins = "40"