139728 + 129100 HE Thread type: UNF Thread type: UNF-LH No. Application: For UNF unified fine threads ASME-B1. - increased number of cutting edges - new coating for optimum wear resistance Advantage: Incorporating a countersink profile for a 90Deg countersink and thread milling in a single operation. Note: Form HB and HE supplied at the same price as HA.