MKR Series Solid Carbide Micro Radius Grooving Bars for Internal Groove Machining

Solid carbide MKR micro radius grooving bars for machining full-radius internal grooves and smooth relief profiles in small bores. Standard radii from R0.3 to R1.0 and multiple working lengths are available, with custom dimensions, OEM marking and private-label support for distributors.
Substrate:Fine-Grain Solid Carbide
Tipo di utensile:Micro Internal Radius Grooving Bar
Series: MKR
Raggio d'azione:R0.3–R1.0 mm
Minimum Bore:Ø4.1 / Ø5.1 / Ø6.1 / Ø8.1 mm
Shank Diameter:Ø4 / Ø5 / Ø6 / Ø8 mm
Working Length:10 / 15 / 22 / 30 mm
Custom Options:Radius / Dimensions / Coating / Marking
Standard Dispatch1–3 Working Days
OEM & CustomDrawings / Samples
Ordine minimoMOQ 10 Pieces
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Qualità costante

Consistent geometry across repeat orders.

Ordini flessibili

Small batches and mixed sizes available.

OEM Support

Custom marking, labels and packaging.

Standard e personalizzati

Standard sizes and custom configurations.

MKR Micro Radius Grooving Bars

MKR series solid carbide micro radius grooving bars are designed for machining precision full-radius grooves and smooth relief profiles inside small bores. The precision-ground cutting profile produces controlled groove radii and consistent curved groove bottoms in miniature turned components.

Standard models cover R0.3 to R1.0 mm radii, Ø4 to Ø8 mm shanks and minimum bore diameters from Ø4.1 to Ø8.1 mm. Multiple working lengths are available for shallow and recessed internal grooves, with drawing-based customization available for non-standard profiles and dimensions.

Panoramica del prodotto

MKR solid carbide micro radius grooving bars

Key Product Advantages

MKR Series Solid Carbide Micro Radius Grooving Bars product advantages

Full-Radius Groove Profile
Precision-ground cutting geometry produces controlled curved groove bottoms and smooth internal transitions.
Small-Bore Access
Standard models support minimum machining diameters from Ø4.1 to Ø8.1 mm.
Solid Carbide Construction
Integral carbide construction provides rigidity and helps control deflection during precision internal grooving.
Multiple Radius Options
Standard R0.3, R0.4, R0.5, R0.6, R0.75 and R1.0 profiles cover different groove forms and component sizes.

Applicazioni tipiche

Applicazione Machining Purpose
Internal Radius Grooving Produces full-radius grooves inside small-diameter bores.
Internal Relief Profiles Machines smooth relief features and curved transitions near internal shoulders.
Precision Form Grooving Forms repeatable radiused groove profiles in miniature turned components.
Recessed Internal Features Longer working-length models provide access to grooves located deeper inside the bore.

Product Detail Photo

MKR internal boring bar real photoMKR micro radius grooving bars product detailMKR Series Solid Carbide Micro Radius Grooving Bars 2pcs

Tool Geometry & Structure

MKR micro radius grooving bar tool structure and model identification

The cutting head uses a full-radius profile in which the standard groove width is twice the specified radius. For example, an R0.5 tool produces a nominal 1.0 mm groove width, while an R1.0 tool produces a nominal 2.0 mm groove width.

Select the working length according to groove position and use the shortest model that can reach the feature. This improves rigidity and helps reduce vibration, tool deflection and profile variation.

Tool Nomenclature & Selection Guide

Select the suitable MKR micro radius grooving bar according to shank diameter, minimum bore diameter, groove radius, groove width, working length and internal feature position.

Codice Descrizione Example
MKR Micro Internal Radius Grooving Bar Internal full-radius groove machining
4 / 5 / 6 / 8 Diametro del gambo Ø4 / Ø5 / Ø6 / Ø8 mm
R0.3–R1.0 Cutting Radius 0.3–1.0 mm radius
L10–L30 Working Length L1 10 / 15 / 22 / 30 mm

Dimensions & Available Sizes

MKR micro radius grooving bars dimension drawing and size chart

Dimensions are shown in millimetres. Custom radii, working lengths, groove profiles and minimum bore configurations are available according to drawings.

Standard Model Range

Diametro del gambo Minimum Bore Available Radii Working Length L1 Lunghezza complessiva
Ø4 mm Ø4.1 mm R0.3 / R0.4 / R0.5 / R0.75 10 / 15 mm 50 mm
Ø5 mm Ø5.1 mm R0.5 / R0.75 / R1.0 15 / 22 mm 50 mm
Ø6 mm Ø6.1 mm R0.5 / R0.6 / R0.75 / R1.0 15 / 22 mm 50 mm
Ø8 mm Ø8.1 mm R0.5 / R0.6 / R0.75 / R1.0 22 / 30 mm 60 mm

Radius & Nominal Groove Width

Cutting Radius Nominal Groove Width b Standard Availability
R0.3 0.6 mm Ø4 mm shank
R0.4 0.8 mm Ø4 mm shank
R0.5 1,0 mm Ø4 / Ø5 / Ø6 / Ø8 mm shanks
R0.6 1.2 mm Ø6 / Ø8 mm shanks
R0.75 1,5 mm Ø4 / Ø5 / Ø6 / Ø8 mm shanks
R1.0 2,0 mm Ø5 / Ø6 / Ø8 mm shanks

Selection & Setup Guidance

Minimum Bore Confirm that the bore is larger than the specified minimum machining diameter.
Radius Selection Match the cutting radius and nominal groove width to the required component profile.
Working Length Use the shortest working length capable of reaching the groove to maintain rigidity.
Tool Clearance Check the cutting, side movement and retraction path before machining recessed grooves.

Related Micro Internal Tooling Series

Thread Relief Grooving: MDR Series

Internal Profiling: MQR Series

Radius Face Grooving: MZR / MZL Series

Internal Grooving: MGR Series

Micro Internal Tooling Catalog

View the complete micro boring, grooving, profiling and threading tool range in the HY Micro Internal Tooling Catalog (PDF).

We support distributors, tooling suppliers and industrial partners with flexible OEM and private label solutions for micro internal tooling products. From laser marking and customized packaging to product identification and technical documentation, we help customers build their own tooling product lines with reliable manufacturing support.

OEM Product Scope

We provide OEM and private label manufacturing solutions for micro internal tooling products, supporting distributors and tooling suppliers with standard series, customized specifications and drawing-based production.

● Micro Boring Bars

MPR series and customized small-diameter boring tools for precision internal machining and anti-vibration applications.

● Micro Internal Threading Bars

MIR/MIL series with customized thread profiles, dimensions and product identification requirements.

● Micro Grooving Tools

Internal grooving and special groove solutions for miniature precision components.

● Custom Micro Tooling

Non-standard dimensions, special geometries and customer drawing-based tooling solutions are available.

mini boring bars

Opzioni di personalizzazione

Custom laser marking for micro internal tooling

Laser Marking & Product Identification

Custom logo, model number and product identification marking can be provided according to distributor and brand requirements.

Custom packaging solution for micro tooling

Custom Packaging

Individual packaging, labels and product information can be customized to support reseller sales channels and private brand development.

Technical documentation support for tooling OEM

Technical Documents & Product Support

Support technical drawings, specifications and product information to help distributors promote and manage their tooling products.

OEM Workflow

01. Requirement Review

Confirm drawings, specifications, materials and packaging requirements.

02. Tool Confirmation

Finalize tool design, marking details and production requirements.

03. Sample Approval

Provide samples for testing and approval before batch production.

04. Batch Production

Produce and inspect according to confirmed requirements.

custom cutting tool process hy cutting tools

Private Label Support for Distributors

For distributors and tooling resellers, we provide flexible private label support including customized marking, packaging solutions and product documentation to help establish a professional tooling product range.

We follow strict quality control procedures from raw material inspection to final shipment. Each tool is inspected to ensure consistent dimensions, cutting performance and reliable quality for industrial machining applications.

Processo di controllo della qualità

Quality control inspection for carbide cutting tools
01 Material Inspection

Verify carbide material quality and consistency before production.

02 Precision Grinding Control

Control tool geometry, dimensions and cutting edge accuracy during manufacturing.

03 Cutting Edge Inspection

Inspect edge quality and surface finish to maintain stable cutting performance.

04 Final Quality Inspection

Confirm product specifications before packing and shipment.

Inspection Standards

Inspection Item Purpose
Material Inspection Verify carbide quality and material consistency.
Dimension Inspection Confirm tool size and tolerance requirements.
Cutting Edge Inspection Check edge geometry and surface quality.
Ispezione finale Ensure products meet confirmed specifications before delivery.

Packing & Protection

Carbide cutting tool packing and protection

Individual protection and export packaging help prevent tool damage during storage and international transportation.

  • Individual tool protection
  • Product identification labels
  • Batch traceability support
  • Export shipment protection

Production & Delivery Workflow

01

Conferma d'ordine

02

Production Scheduling

03

Quality Inspection

04

Packing

05

Shipment

export packing way hy cutting toolsShipping and payment hy cutting tools end mill drills

Delivery Support

Standard products can usually be shipped within 1–3 working days after order confirmation. Customized products require confirmation according to tool design, quantity and production requirements.

FAQ & Downloads

Product FAQs

What are MKR micro radius grooving bars used for?
MKR series tools are designed for machining full-radius grooves, curved relief features and smooth profile transitions inside small bores. Typical applications include miniature turned components, sleeves, bushings and other precision internal features.
What is a full-radius internal groove?
A full-radius groove has a curved groove bottom formed by the complete radius of the cutting edge. In the standard MKR range, the nominal groove width is twice the specified cutting radius.
What radius sizes are available for the MKR series?
Standard radius options include R0.3, R0.4, R0.5, R0.6, R0.75 and R1.0 mm. Availability depends on the selected shank diameter and minimum bore size.
What minimum bore diameters can MKR tools machine?
The standard range supports minimum bore diameters of Ø4.1, Ø5.1, Ø6.1 and Ø8.1 mm. Additional clearance may be required depending on the groove location and the complete tool movement.
What materials can be machined with MKR radius grooving bars?
Typical applications include carbon steel, alloy steel, stainless steel, cast iron and selected non-ferrous materials. The coating, edge preparation and cutting parameters should be matched to the workpiece material and machining conditions.

Selection & Application FAQs

How do I select the correct MKR model?
Select the model according to the required groove radius, nominal groove width, minimum bore diameter, shank diameter, groove position and working length. Use the shortest model that can safely reach the groove.
How are cutting radius and groove width related?
For the standard full-radius MKR profile, the nominal groove width is twice the cutting radius. R0.3 produces a 0.6 mm groove, R0.5 produces a 1.0 mm groove, R0.75 produces a 1.5 mm groove and R1.0 produces a 2.0 mm groove.
Which shank diameter should I choose?
Use an Ø4 mm shank for bores of Ø4.1 mm or larger, Ø5 mm for Ø5.1 mm or larger, Ø6 mm for Ø6.1 mm or larger, and Ø8 mm for Ø8.1 mm or larger. When space permits, a larger shank generally provides greater rigidity.
Which working lengths are available?
The Ø4 mm series is available with 10 mm and 15 mm working lengths. The Ø5 mm and Ø6 mm series are available with 15 mm and 22 mm working lengths. The Ø8 mm series is available with 22 mm and 30 mm working lengths.
How can I improve stability during internal radius grooving?
Use the largest shank diameter permitted by the bore, select the shortest practical working length, minimize tool overhang and confirm the correct center height. Cutting speed and feed should be adjusted according to groove depth, workpiece material and machine rigidity.
How should I check tool clearance before machining?
Check the minimum bore diameter, groove position, internal shoulder clearance and complete cutting and retraction path. A component drawing is recommended when the groove is deep inside the bore or close to another internal feature.

Ordering & OEM FAQs

Can you manufacture custom MKR radius grooving bars?
Yes. The groove radius, groove width, groove depth, minimum bore diameter, cutting profile, working length, shank diameter, coating and edge preparation can be customized according to drawings or samples.
What information is required for an MKR quotation?
Please provide the standard model or component drawing, required groove radius, groove width, groove depth, minimum bore diameter, groove position, workpiece material, quantity and any coating or marking requirements.
Can distributors order mixed radii and working lengths?
Yes. Mixed-model orders can be reviewed according to the selected radii, shank diameters, working lengths and available stock. Sample quantities are also supported for application testing.
What is the minimum order quantity?
The standard minimum order quantity is 10 pieces. For mixed sizes or customized tools, the final minimum quantity should be confirmed according to the specifications and production requirements.
Is OEM marking and private-label packaging available?
Yes. Custom model identification, laser logo marking, labels and private-label packaging are available for distributors, tooling suppliers and industrial customers.
What is the lead time for standard and customized MKR tools?
In-stock standard models can usually be dispatched within 1–3 working days after order confirmation. Customized tools require separate lead-time confirmation according to geometry, coating, quantity and drawing approval.

Risorse tecniche

Micro Internal Tooling Catalog HY Micro Internal Tooling Catalog (PDF)

Need Sizes, Pricing or Custom Options?

Send us the required tool type, sizes, quantities, workpiece material and any OEM or custom requirements. We will confirm suitable specifications, availability, lead time and quotation details.

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