The solid carbide extra-long machine reamers with parallel shank and centesimal diameter progression, made from K40 ultra-fine micrograin carbide, are precision tools designed for finishing pre-machined holes on machine tools. They are particularly suitable when the hole to be machined is deep, far from the access point or positioned in an area where a standard reamer would not provide the required working length. The centesimal progression allows the most suitable diameter to be selected according to the required final size, making the tool suitable for operations requiring high dimensional control.

The extra-long version makes it possible to reach internal seats, deep through holes, thick components and complex mechanical parts. The parallel shank allows clamping in compatible chucks or tool holders, providing practical mounting and good versatility of use on drills, milling machines, machining centres, lathes and suitable machine tools.

The solid carbide construction in K40 ultra-fine micrograin provides high rigidity, good dimensional stability and wear resistance. The ultra-fine micrograin structure contributes to cutting edge strength and finishing quality, making the reamer suitable for professional machining where consistent accuracy, repeatability and hole quality are required even in repeated production cycles.

The left-hand helix 6° cutting edges support controlled and stable hole machining. The reamer must be used on an already prepared pre-hole with suitable and uniform machining allowance. Correct hole preparation is essential to avoid vibration, scoring, ovality, tool deflection and inconsistent dimensional results, especially when machining deep holes.

When working with extra-long tools, correct alignment between spindle, tool and hole is particularly important. The greater length of the reamer requires rigidity, correct clamping and suitable cutting parameters, because misalignment or vibration can affect final accuracy. Feed must be regular and lubrication or coolant must be selected according to the material being machined and hole depth.

These reamers are suitable for finishing deep holes in mechanical components, fitting seats, machine tool parts, tooling, precision components, assembly elements and workpieces intended for dimensional inspection. They are useful in CNC and conventional machining where internal areas must be reached while maintaining good control of diameter and surface quality.

For good results, it is advisable to select the correct centesimal diameter, prepare the hole with the proper allowance, avoid excessive material removal and check tool stability during machining. With deep holes, careful operation is recommended, maintaining good coolant flow and checking chip evacuation to reduce the risk of seizure or marks on the internal surface.

The solid carbide extra-long machine reamers with parallel shank in K40 ultra-fine micrograin are therefore a technical solution for finishing deep holes and hard-to-reach areas. The combination of long series design, parallel shank, solid carbide construction, K40 ultra-fine micrograin, left-hand helix 6° and centesimal diameter availability makes them suitable for mechanical workshops and production departments requiring accuracy, repeatability, tool stability and hole quality.