API THREADING
STYLE LT
INTERNAL AND EXTERNAL

• H-90 and other special thread forms available on request..
  

Internal, full topping form shown.

API THREADING
STYLE TNMA
INTERNAL AND EXTERNAL

Full-topping form;

*Specify internal or external when ordering.

Non-topping form for internal or external;

• The following API connections having obsolete thread form V-0.065 are interchangeable with the V-0.038 2 TPF thread form per API specification 7; 2-3/8 IF, 2-7/8 IF, 3-1/2 IF, 4 FH, 41F and 4-1/2 IF.
  
• For API thread forms other than shown please inquire.
  
• Certain API connections are interchangeable as follows; NC-26 and 2-3/8 IF, NC-31 and 2-7/8 IF, NC-38 and 3-1/2 IF, NC-40 and 4 FH, NC-46 and 4 IF, NC-50 and 4-1/2 IF.  See API specification 7; pp. 23-25.