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_26967904_1 (chambering VARCHAR, f_bolt VARCHAR, p_max___bar__ VARCHAR)

### Question ###
With what type of chambering is the F bolt n (lbf) and the P max (bar) 3900?

### Accurate SQL ###

SELECT chambering FROM table_26967904_1 WHERE f_bolt = "N (lbf)" AND p_max___bar__ = 3900