CNC Counterboring Services

This image highlights precision secondary machining operations on heavy-gauge steel plates. After being cut to shape, which includes a distinct side notch, these components have undergone drilling and countersinking. The multiple holes are perfectly aligned across the stack and feature a clear conical bevel (countersink) to accommodate flush-mount fasteners. The raw finish of the steel and the workshop setting underscore the industrial nature of the work, demonstrating a capability for producing large, batch-ordered parts that require multi-stage manufacturing.

Precision CNC Counterboring for Critical Projects

At RMP, we provide specialist CNC counterboring services for industries where precision, compliance, and reliability are non-negotiable. Whether you require shallow or deep counterbores, our CNC machining ensures absolute accuracy and repeatability, delivering components that meet the highest engineering and compliance standards, including UKCA to Execution Class 4.

What is Counterboring?

A counterbore is an enlarged cylindrical recess that allows a bolt, fastener, or component to sit flush or below the surface of the material. Unlike countersinking services, which creates a conical recess, counterboring creates a flat-bottomed hole that improves strength, fit and finish.

Our CNC counterboring process combines drilling, boring, and finishing operations in a single setup. This not only ensures precision but also reduces lead times and costs for your project.

Our CNC Counterboring Capabilities

We’ve invested in advanced Haas CNC centres as well as our unique Gemini machine to deliver high-tolerance machining across a wide range of steels and specifications:

Sizes & Depths: From shallow recesses to deep counterbores.
Materials: Variety of steels like structural, weather resistant and offshore.
Tolerances: Tight tolerances achieved with CNC precision.
Integrated Machining: Combine counterboring with drilling, tapping and finishing for efficiency.

This means complete flexibility to match exact specifications and guaranteeing parts are right the first time, every time.

Why Choose RMP for CNC Counterboring?

Compliance Assured – Our UKCA EXC4 and ISO 9001 certifications mean components are audit-ready for large infrastructure projects.
One-Stop Solution – We manage cutting, machining and finishing in-house, reducing supply chain risks.
Proven Reliability – Over 35 years’ experience, trusted by leading names such as JCB.
Precision at Scale – With the ability to cove any sized projects, our CNC counterboring services deliver consistent quality.

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Other CNC Machining Services We Offer

As well as counterboring, we offer a full suite of CNC machining services to support complex engineering projects. This ensures that all components can be produced in-house with consistent quality and full compliance. Our services include:

CNC Milling – For complex geometries, slots, and profiles with high dimensional accuracy.
CNC Drilling – Fast, precise hole creation in a variety of materials and thicknesses.
CNC Tapping – Accurate thread production for bolts, fixings, and structural applications.
CNC Countersinking – Creating conical recesses to ensure flush or angled fastener seating.

By offering these services alongside counterboring, we provide a complete machining solution, reducing the need for multiple suppliers while maintaining full compliance and quality control.

CNC Counterboring FAQs

What is the difference between counterboring and countersinking?

A counterbore creates a flat-bottomed recess for bolts or fasteners to sit flush. Countersinking, on the other hand, creates a conical recess for angled fasteners.