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6-Flute Step PCD Reamer Head – High-Accuracy Hole Finishing

Overview

The 6-Flute Step PCD Reamer Head is a precision modular reaming tool designed for finishing stepped and multi-diameter bores in aluminum alloys, magnesium alloys, composites, and other non-ferrous materials. Equipped with six polycrystalline diamond (PCD) cutting edges in a step configuration, it provides excellent dimensional stability, high surface quality, and long tool life in high-volume CNC machining environments.Related technical article:Aoshiji® Custom Tool – Drill-Reamer Combination Tool for Diesel Engine Oil Dipstick Hole Machining

For a complete overview of PCD reamers, including piloted, brazed, form, multi-step, combination, and adjustable reaming tools, visit our main PCD Reamers guide.

PCD Reamers guide

Applications

  • Precision finishing of stepped bores in automotive engine blocks and cylinder heads

  • Aerospace components requiring multi-diameter bore machining with tight tolerances

  • Hydraulic and pneumatic valve bodies demanding accurate bore alignment

  • Precision die-cast housings with complex bore configurations

Key Features

  • 6-flute step geometry – Stable cutting and efficient multi-diameter bore finishing

  • Head-only modular design – Compatible with ISO-standard arbors and modular tool systems

  • PCD cutting edges – Outstanding wear resistance and extended service life in non-ferrous machining

  • Micron-level accuracy – Maintains roundness, straightness, and step depth within tolerance

  • Superior surface finish – Achieves Ra ≤ 0.2 µm for high-quality bore finishing

  • Customizable designs – Step count, diameter range, and chamfer features per drawing

Benefits

  • Reduces cycle time by combining multiple reaming operations into one tool

  • Cost-efficient modular replacement – Replace only the head instead of the entire tool

  • Ensures stable performance and rigidity in modular reaming systems

  • Produces mirror-like bore finishes with consistent IT6 tolerance-level accuracy

  • Adaptable to complex bore profiles for automotive, aerospace, and precision engineering industries

Technical Specifications

ParameterSpecification
Tool typePCD Step Reamer Head (modular)
Cutting edges6 (six-flute configuration)
Cutting materialPCD (Polycrystalline Diamond)
Diameter rangeØ6 – Ø25 mm (customizable)
Connection typeModular head, compatible with standard arbors
Application focusMulti-diameter stepped bore finishing in non-ferrous alloys
Coolant supplyCoolant-through design optional
ToleranceIT6 and tighter tolerances available

Options & Customization

  • Flute options: 2, 3, 4, or 6-flute reamer heads

  • Step geometry: single-step, dual-step, or multi-step configurations

  • Tapered or compound bore geometries available

  • Coolant-through or solid design depending on machining requirements

  • Compatible with a wide range of modular holders (HSK, BT, Weldon, ISO-standard)

Related Tools

Contact

For detailed drawings, customization requirements, or a quotation, please contact:
[email protected]
Aoshiji® Custom Tool – Precision PCD and Custom CNC Tooling Solutions

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PCD REAMER:

PCD Reamer Basics

Full Form Reamers

Brazed PCD Reamers

Piloted PCD Reamers

Multi-Step PCD Reamers

Adjustable PCD Reamers

Combination PCD Reamers

SOLID CARBIDE REAMERS :

REAMERS

STEP REAMERS

BRAZED CARBIDE REAMERS :

For Hydraulic Control Valve Body

Aoshiji® Custom Tool – 6-flute step PCD reamer head for high-accuracy multi-diameter finishing.

PCD Reamer Basics

2-flute PCD step reamer for multi-step bore finishing in aluminium, combining multiple diameters in one pass

Definition, functions, and selection boundaries for PCD reamers in bore finishing. Start here before choosing brazed, step, form, piloted, adjustable, or combination PCD reamer concepts.

Piloted PCD Reamers

Piloted PCD reamer with pilot guide for alignment-critical bore finishing and coaxiality control

Piloted PCD reamers add a guiding pilot to improve alignment in coaxiality-critical bores. They are often used when maintaining bore-to-bore relationship, straightness, or alignment is as important as final size and finish.

Brazed PCD Reamers

4-flute reamer with an integrated chamfer for finishing the bore and entry chamfer in one pass

Brazed PCD reamers are a mainstream production solution where PCD cutting segments/tips are brazed onto a tool body. This concept is widely used for straight-shank, step, and form reamers because it balances performance with practical tool manufacture and cost control.

Full Form Reamers

BT taper shank PCD form reamer for profile-related bore finishing, combining wear resistance and repeatable form accuracy

PCD form reamers are tailored to bores with defined profile features where form accuracy must be repeated over long runs. The geometry is application-specific and is typically driven by the bore profile, allowance, and required surface integrity.

Multi-Step PCD Reamers

Three-step profiled PCD step reamer for stepped bore finishing with formed transitions in one pass

Multi-step PCD reamers finish multiple diameters (and often chamfers) in a single pass, reducing tool changes and improving positional consistency between features. They are commonly selected in high-volume production where cycle time and repeatability are critical.

Combination PCD Reamers

2-flute helical combination PCD reamer integrating PCD OD machining, internal step turning, and ID chamfering for one-pass bore finishing

Combination tools integrate reaming with additional operations to reduce tool changes and improve process efficiency. The exact concept depends on the part features and the process plan, and is typically developed as a dedicated production tool.

Adjustable PCD Reamers

fine-adjustable PCD reamer with diameter adjustment unit for micro-adjustable final sizing

Adjustable PCD reamers are used when fine diameter compensation is required—typically on larger bores—so size can be corrected without replacing the full tool. This concept supports predictable tool management in long production runs.

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