Threading Inserts BUTTRESS CASING API SPEC 5B : 2008 B A A B API BUTNUT I.C. I.C. L L 10° IPF3° API BUT SCREW INTERNAL EXTERNAL EXTERNAL PITCH TAPER CATALOG NUMBERTPIIPFRIGHT HAND SIZE DIMENSIONSLmmI.C.A B 5 0.75 BUT575 ER22 4 1/2" – 13 3/8" 2.2 2.3 22 12.70 5 1.00 BUT510 ER22 16" - 20" 2.2 2.3 INTERNAL PITCH TAPER CATALOG NUMBERTPIIPFRIGHT HAND SIZE DIMENSIONSLmmI.C.A B 5 0.75 BUT575 IR22 4 1/2" – 13 3/8" 2.2 2.3 22 12.70 5 1.00 BUT510 IR22 16" - 20" 2.2 2.3 49