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4-Axis CNC Machining Services

4-axis CNC machining and milling from ISO 9001 and IATF 16949 certified facilities. Index rotation on the A or B axis reaches features on multiple faces without re-fixturing, holding ±0.001 inch and cutting re-setup error from the program.

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Trusted by Programs across Tier 1 suppliers, Fortune 500 OEMs & hardware startups
  • Honda
  • Libman
  • Mahindra
  • Meyer
  • MIT
  • Amazon
  • Bloom Energy
  • Circor
  • Halliburton
  • Honda
4-Axis CNC Machining capabilities

Technical Capabilities

Review core 4-axis cnc machining capabilities, materials, tolerances, inspection methods, and production requirements before requesting a quote.

Production envelope · Verified
Standard tolerance held
01
±0.001"
Multi-face indexed rotation
02
Single setup
Anodize, plate, powder + more
03
7 finishes
Materials
Aluminum 6061 and 7075, stainless 303 and 316, mild steel, titanium Grade 5, brass, and engineering plastics
Process
4-axis CNC milling with rotary A or B axis indexing; 3-axis features on the same program; 5-axis available where geometry requires simultaneous motion
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See Our Process Or same-day technical feasibility review

Production specifications

Dimensional tolerance
±0.001" standard on 4-axis programs; tighter tolerances confirmed against the feature at feasibility review
Surface finish
Down to Ra 0.8 µm (32 µin) as-machined; finer finishes available on qualifying surfaces
Geometry capability
Features on multiple faces accessed via indexed rotation; axial and radial features on cylindrical parts in a single setup
Secondary operations
Anodizing, powder coating, plating, passivation, heat treatment, bead blasting, black oxide
Inspection
First-article inspection on every new part, in-process inspection, full dimensional reports; CMM available on request
Certifications
ISO 9001, IATF 16949
Standard lead time
4-8 weeks from approved drawings

Production Process

01 DFM Review
02 Custom Raw Material and Fixtures
03 First Articles
04 Production
Next step

Ready for technical review?

Share your part details, drawings, or CAD files. Redstone will review the requirements and confirm feasibility, tolerances, materials, lead time, and next steps.

  • Feasibility review based on your drawing or CAD file
  • Material, tolerance, and production requirements confirmed
  • Quote reviewed within 24 hours
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Final specifications are confirmed during the technical feasibility review.

Why Redstone

Quality, cost, and a clear fit

Redstone helps hardware teams move from released drawings to repeat production with documented quality, competitive unit costs, and engineering support from the U.S.

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  • ISO 9001 certified facilities
  • U.S.-based engineering support
  • Direct manufacturing partner
Quality

Multi-face features. Single setup. Certified production.

Adding a rotary A or B axis to a 3-axis program lets the machine reach features on two or more faces of a part without unclamping and re-fixturing. Fewer setups mean fewer tolerance stack-up opportunities. Every 4-axis CNC machining program runs at ISO 9001 and IATF 16949 certified facilities with first-article inspection and dimensional reporting.

  • ISO 9001 and IATF 16949 certified facilities
  • Rotary indexing eliminates re-fixture tolerance stack-up on multi-face parts
  • First-article inspection with a dimensional report on every new part
  • Certificate of Conformance and material certification with every shipment
Cost

More geometry for less rework, not more overhead

4-axis is the cost-efficient middle lane between 3-axis simplicity and 5-axis cycle time. When a part has features on a second face, moving to 4-axis and eliminating a second setup often lowers total cost even against a pure 3-axis quote. Redstone quotes landed cost, with programming, fixturing, freight, and duties in the number before you see it.

  • Around 20% average landed-cost savings vs domestic-only, based on internal comparisons
  • Eliminating re-fixturing reduces scrap and rework cost on multi-face programs
  • Programming, fixturing, freight, and duties quoted up front
  • No offshore quote desk between you and the production line
Fit

Is this a fit?

4-axis machining is the right choice for parts with machined features on two or more faces, cylindrical parts with axial and radial features, and programs where a second setup on a 3-axis machine raises tolerance risk. If your geometry requires simultaneous tilting in more than one rotary axis or contoured surfaces, our engineering team will recommend 5-axis at the feasibility review.

  • Parts with features on two or more faces requiring indexed rotation
  • Cylindrical parts combining axial and radial machined features
  • Programs where a second 3-axis setup creates unacceptable tolerance stack-up
  • Engineering-led teams working from released CAD and GD and T
Parts built for production

What we produce

Redstone supports production metal parts across automotive, electronics, industrial equipment, and consumer hardware programs.

Multi-face automotive and Tier 1 housings

Multi-face automotive and Tier 1 housings

Machined housings and bodies with bolt patterns, ports, and milled faces on two or more sides, produced in a single 4-axis setup under IATF 16949 with dimensional reporting on every batch. Fewer re-fixturings mean tighter positional tolerance between faces.

Cylindrical components with radial and axial features

Cylindrical components with radial and axial features

Shafts, valve bodies, and cylindrical housings that combine radial holes, keyways, and axial end features are natural candidates for 4-axis. The rotary axis indexes the part to each radial feature without unclamping.

Industrial manifolds and fittings with ported faces

Industrial manifolds and fittings with ported faces

Precision manifolds and fittings with ports on multiple faces benefit from 4-axis indexing. Eliminating the re-fixture between ported faces improves cross-face positional accuracy and reduces the opportunity for error.

Complex brackets requiring indexed cross-drilling

Complex brackets requiring indexed cross-drilling

Structural brackets where cross-drilled holes or milled slots must hold positional tolerance relative to features on the primary face are a cost-efficient 4-axis application, avoiding the higher cycle time of simultaneous 5-axis motion.

From quote to production

A five-step process, documented at every handoff

From initial drawings to final delivery, Redstone keeps each stage clear, documented, and aligned with production requirements.

Each handoff is documented. No stage moves forward until drawings, materials, and production requirements are confirmed with the customer.

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  1. 01

    Submit Your Files

    Upload CAD files in STEP, IGES, DXF, or DWG with 2D drawings and GD and T callouts. Our engineering team reviews each submission for 4-axis manufacturability, confirms the rotary indexing strategy, and flags any features that require 5-axis motion before quoting.

  2. 02

    Receive a Quotation

    A full quotation covering programming, fixturing, rotary axis strategy, unit pricing by volume tier, lead time, and material and finish options. One U.S. point of contact manages the program from RFQ through your receiving dock.

  3. 03

    First Article

    We program, fixture, and cut a first article using the confirmed 4-axis strategy, then issue a dimensional report against every called-out tolerance on your drawing. Samples ship to your engineering team for sign-off before volume production starts.

  4. 04

    Production

    Volume machining runs at the assigned certified facility under documented quality control. Your U.S. point of contact sends progress updates and photo documentation throughout the run.

  5. 05

    Inspection and Delivery

    Every shipment includes a Certificate of Conformance, a dimensional report, and material certification. We are the importer of record and coordinate freight to your dock. Landed cost on delivery matches the number quoted.

Industries

Industries we machine for

Redstone supports production 4-axis CNC machining programs for OEMs and engineering-led teams that require repeatable quality, controlled costs, and reliable part production.

  • Automotive

    Automotive

    Production components for automotive Tier 1 and Tier 2 suppliers and specialty OEM programs, run to IATF 16949 in certified facilities with U.S. engineering oversight from quote through delivery.

    • You run automotive components at production volume, not one-off prototypes.
    • Your program needs IATF 16949 quality and audit-ready documentation.
    • You are a Tier 1 or Tier 2 supplier, or a smaller OEM program that wants production-grade quality without a large-OEM minimum-order gate.
  • Industrial Equipment

    Industrial Equipment

    Cast, machined, and fabricated components for industrial equipment programs, run to ISO 9001 with U.S. engineering oversight from quote through delivery.

    • You run cast, machined, or fabricated components at production volume, not one-off prototypes.
    • Your equipment operates in demanding service environments.
    • You want to consolidate multiple processes with one supplier and one U.S. point of contact.
  • Electronics

    Electronics

    Production 4-axis cnc machining components for electronics programs, run to documented quality with U.S. engineering oversight.

    • Recurring production volume
    • Documented dimensional inspection
    • One U.S. point of contact
  • Consumer Products

    Consumer Products

    Production 4-axis cnc machining components for consumer products programs, run to documented quality with U.S. engineering oversight.

    • Recurring production volume
    • Documented dimensional inspection
    • One U.S. point of contact
  • Energy

    Energy

    Production 4-axis cnc machining components for energy programs, run to documented quality with U.S. engineering oversight.

    • Recurring production volume
    • Documented dimensional inspection
    • One U.S. point of contact
  • Defense

    Defense

    Machined and cast components for commercial firearms programs, run to ISO 9001 in certified facilities with full material traceability and U.S. engineering oversight from quote through delivery.

    • You run firearms components at production volume, not one-off prototypes.
    • Your parts have safety-critical, tight-tolerance features that need documented inspection.
    • You work from released drawings and need audit-ready quality documentation and material traceability.

Not sure if 4-axis CNC machining fits your part?

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Related capabilities

Related capabilities

Additional manufacturing processes that can support die casting programs, secondary operations, and production-ready metal parts.

Die Casting

Die Casting

Aluminum and zinc die casting for high-volume, dimensionally precise components.

View capability
Sheet Metal Fabrication

Sheet Metal Fabrication

Laser cutting, bending, stamping, and welding for precision sheet metal components.

View capability
Investment Casting

Investment Casting

Stainless, aluminum, and alloy lost-wax castings with fine detail and tight tolerance.

View capability
Sand Casting

Sand Casting

Aluminum, iron, steel, and brass castings from low-volume runs to large production batches.

View capability

Need help choosing the right process?

Share your part requirements and Redstone can help determine the right manufacturing path.

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Final step

Ready to review your part?

Share your drawings, CAD files, or production requirements. Redstone will review feasibility, materials, tolerances, lead time, and the best manufacturing path for your program.

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  • ISO 9001 and IATF 16949 certified facilities
  • U.S.-based engineering support
  • Quote reviewed within 24 hours
  • Production support across Redstone’s facilities in the U.S., Mexico, and China
Resources

From the engineering desk

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Frequently asked questions

Don’t see your question? Request a quote and our engineering team will answer it.

What is 4-axis CNC machining?

4-axis CNC machining adds a rotary A or B axis to the three linear axes of standard CNC milling. The machine indexes the workpiece to a new angular position, allowing the cutting tool to reach features on a second or third face without unclamping and re-fixturing. This reduces the tolerance stack-up that accumulates when a part is re-clamped between setups, and it cuts the total setup count on multi-face programs.

What is the difference between 4-axis and 5-axis machining?

4-axis machining indexes to a fixed angular position, then machines from that position with X, Y, Z motion. 5-axis machining moves the rotary axis or axes simultaneously with the linear axes, allowing the tool to follow complex contoured surfaces and reach undercuts in a continuous motion. If your part has features on multiple flat faces without compound angles or continuous contours, 4-axis is typically sufficient and more cost-efficient. Our engineering team reviews your CAD at the feasibility stage and recommends the right configuration.

What tolerances can you hold on 4-axis programs?

Standard tolerance on 4-axis programs is ±0.001 inch. Tighter tolerances are reviewed against the specific feature and the inspection method at the feasibility review and confirmed in the quote.

What materials do you machine?

We machine aluminum 6061 and 7075, stainless 303 and 316, mild steel, titanium Grade 5, brass, and engineering plastics. If your part calls for a specific alloy or temper, our engineering team confirms availability and machinability at the feasibility review.

What are your standard lead times?

Standard production lead time is 4 to 8 weeks from approved drawings, with first-article timing confirmed at the quote stage. Rush programs are reviewed case by case.

How do customs and delivery work?

We are the importer of record and manage customs clearance, then coordinate freight to your dock with tracking. Duties and freight are quoted up front so there is no surprise on the invoice.