The Mandrel is made from AISI 4140/ 4145H modified alloy steel, fully heat treated to a Brinell Hardness range of 285 - 341 and has an IZOD impact strength of minimum 40 ft-lbs. The connections are machined and finished according to API Specifications. Thread roots are cold rolled after machining, phosphatized to prevent galling during initial make-up, and installed with pressed steel thread protectors. The Mandrel is a one-piece design with ample tong space for handling and extra length for recutting connections. The central upset allows several center joint reconditionings.The Sleeve is an integral casting designed for easy make-up to the Mandrel. Hardfacing of the blades of the sleeves is done to increase the tool life. OCTL offers a range of Hardfacing materials to suit different drilling conditions. Sizes 17 1/2" and smaller feature three spiral blades. Larger sizes have four straight blades. Annular flow area is maximized on all sizes to ensure adequate circulation area.
OCTL Sleeve Stabilizer consists of Mandrel on which a Sleeve is simply made up by tongs or sleeve breaker. The OCTL Sleeve Stabilizer provides easy sleeve replacement when changing hole size or when they are worn out of gage.
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in section "Spare parts for boring machines"