Threading Inserts EXTREME LINE CASING API SPEC 5B : 2008 B B EL NUT 6° 6° A A I.C. I.C. L L IPF EL SCREW INTERNAL EXTERNAL EXTERNAL PITCH TAPER DIMENSIONS CATALOG NUMBER SIZE RIGHT HAND L TPI IPF I.C. A B mm 6 1.5 EL615 ER22 5 "- 7 5/8" 2.0 1.9 22 12.70 5 1.25 EL5125 ER22 8 5/8" – 10 3/4" 2.3 2.4 INTERNAL TAPER DIMENSIONS PITCH CATALOG NUMBER SIZE TPI RIGHT HAND L IPF I.C. A B mm 6 1.5 EL615 IR22 5 "- 7 5/8" 2.0 1.9 EL5125 IR22 22 12.70 5 1.25 8 5/8" – 10 3/4" 2.3 2.4 50