Product Description - Square and Hexagonal Kellys are types of Rotary Kellys our company is offering as a product of a highest quality. Product origin - Sumy, Ukraine - UA Key Specifications/Special Features - Certification and standards: API Spec 7-1, API Spec 7-2, Q1 and ISO 9001, ISO 29001 and NS-1 Square and Hexagonal Kelly Steel grade: AISI 4145H mod, fully heat treated as per API Specification Technical parameters Size between facets: from 76,2 mm (3) up to 155,0 mm (6 1/8) Standard overall length: 9000 mm - 16460 mm Standard API thread connections are made with stress relieved elements, cold rolled and phosphated, and equipped with pressed steel or heavy duty plastic thread protectors both ends Ultimate tensile strength: min 140 000/965 ksi/mPa, Yield strength: min 110,000/758 ksi/mPa, Elongation: 15%, Impact strength: min 48J, Brinell hardness: min 285-341 HB Mechanical properties guaranteed to 1 below steel surface. Minimum Order Size and Packaging details - At customer request Kellies are delivered in individual scabbards to protect the work surface from mechanical damage during transportation