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Technical Information for XN Type Threading Technical Information forXN Type Threading XN Type Thread Tooling Is the Proven High - Productivity Threading Solution ! Choosing XN Type Threading System • A superior choice for heavy - duty applications like machining of Acme , Buttress , and API threads . XN Type is also the best system for coarse pitch and multitooth threading applications . • Largest selection of insert geometries and grades in the industry. • Avery rigid insert clamping design ensures best tool life , surface finish , and workpiece quality. • Simplicity of the XN Type design does not require shim selection for thread helix angles . This helps to avoid mistakes on the shop floor. 059 • Reduces inventory by using the same XN Type 060 toolholders and boring bars with either threading or grooving inserts . • An excellent choice for special thread forms and toolholder designs . Precision - Ground Thread Form • Minimises built - up edge . • Precisely cuts most common materials . • Reduces cutting forces . • Ensures accurate high - quality threads . Superior Chip Control • Eliminates long, troublesome coils. • Excellent for internal threading operations. • Available in partial profile inserts for 60 ° thread forms .