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CNC Steel Machining Services

Multi-axis CNC steel machining in mild and carbon steel, alloy steel, tool steel, and stainless. Machining, in-house heat treatment, and finishing run as one program, so the same supplier holds the part from bar stock to hardened, finished, and inspected. ISO 9001 and IATF 16949 certified facilities. The U.S. team runs material selection and quality documentation.

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

Technical Capabilities

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

Production envelope · Verified
5-axis tolerance held
01
±0.0005"
In-house hardening
02
Heat treat
Mild, alloy, tool, stainless
03
4 steel families
Materials
Process
3-axis, 4-axis, and 5-axis CNC milling. CNC turning. In-house heat treatment and hardening. Secondary finishing in-line.
Request a Quote

See Our Process Or same-day technical feasibility review

Production specifications

Steel families
Mild and carbon steel: general structural and machined parts. Alloy steel: higher strength and hardenability. Tool steel: wear and impact resistance. Stainless 303 and 316: corrosion resistance for free-machining parts and marine or chemical service.
Tolerance
±0.001 inch standard on 3-axis and 4-axis machining. ±0.0005 inch held on 5-axis and qualifying programs. Tighter on request with first-article and CMM verification.
Heat treatment and hardening
In-house heat treatment and hardening. Through-hardening, case hardening, and stress relief run under the same program as machining. One supplier holds the part from machining to final hardness.
Lead time
4 to 8 weeks standard from approved drawings. First-article lead time confirmed at quoting.
Finishes
As-machined. Black oxide. Galvanizing. Nickel plating. Bead blasted. Passivation on stainless.
Inspection
First-article inspection, dimensional reports, and CMM verification on critical features; hardness verification and material certification per shipment
Certifications
ISO 9001, IATF 16949, AS9100, ISO 14001
Standard lead time
4-8 weeks

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
Get started Request a Quote or Talk to an Engineer

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.

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

Certified production. In-house inspection.

ISO 9001:2015, IATF 16949, AS9100, and ISO 14001 active across the certified facility list. Statistical process control on volume runs. Third-party inspection at origin before every shipment. Audit-ready documentation included.

  • ISO 9001:2015, IATF 16949, AS9100, and ISO 14001 certified facilities
  • Statistical process control on volume runs
  • Third-party inspection at origin before every shipment
  • Audit-ready documentation included
Cost

Direct manufacturer. Not a broker or portal.

Your RFQ goes to a specific facility and a dedicated U.S. program manager, not a bidding portal. Redstone owns the CNC steel machining relationship and the quality outcome. One U.S. point of contact from quote through receiving dock.

  • Specific facility, not a bidding portal
  • Dedicated U.S. program manager
  • One contact from quote through receiving dock
  • Redstone owns the quality outcome
Fit

Machine, heat-treat, and finish under one program.

Material selection, DFM review, and quality documentation run from the U.S. team. Machining, in-house heat treatment and hardening, and finishing run at the certified facility, so the same supplier controls dimensions before and after hardening. You get one invoice and one contact in your time zone.

  • Material selection and DFM review from the U.S. team
  • Machining, heat treatment, and finishing at the certified facility
  • Same supplier controls dimensions before and after hardening
  • One invoice and one contact in your time zone
Parts built for production

What we produce

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

Industrial Equipment

Industrial Equipment

Shafts, gears, brackets, and hardened wear components. Alloy and tool steel heat-treated in-house for strength and wear life. Corrosion-resistant finishes for outdoor and wet-service parts.

Automotive

Automotive

Machined powertrain and structural components in alloy steel. PPAP and first-article documentation standard. Active recurring production programs with named OEM and Tier 1 customers.

Aerospace and Defense

Aerospace and Defense

Machined steel structural and fitting components to tight tolerance. AS9100 certified facilities. First-article and CMM verification standard on flight and defense programs.

Firearms and Hardware OEM

Firearms and Hardware OEM

Machined steel components, receivers, and hardened parts for firearms and device programs. Black oxide and nickel finishing in-line. Volume from 500 to 100,000+ units per year.

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.

  1. 01

    Quoting

    Send part files, steel family or application, hardness target, and annual volume. Same-day technical feasibility review. Full quote within 48 hours, including material, finishing, freight, and customs where applicable.

  2. 02

    Order placement

    Review the quote and production plan. Sign the production agreement. Redstone confirms steel grade, heat treatment plan, facility assignment, and first-article schedule.

  3. 03

    First article

    First-article parts are machined, heat-treated, and finished, then ship to your engineering team for sign-off with a dimensional report. First-article inspection documented before volume release.

  4. 04

    Production under SPC

    Volume machining runs at the assigned certified facility. Heat treatment and hardening run in-house under the same program. Statistical process control applied on volume runs. Lot traceability maintained end to end.

  5. 05

    Quality and shipment

    Third-party inspection at origin against your approved drawings and tolerances, with CMM verification on critical features. Dimensional report, hardness verification, and material certification included in every shipment. US customs brokerage handled. Landed cost on your dock matches the number Redstone quoted.

Industries

Industries we machine for

Redstone supports production CNC steel 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 cnc steel 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 cnc steel 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 cnc steel 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 CNC steel machining fits your part?

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.

  • 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

Visit the Resource Hub

Frequently asked questions

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

Which steel should I use for my part?

Mild or carbon steel for general structural and machined parts. Alloy steel when the part needs higher strength and runs hardened in service. Tool steel for dies, jigs, and wear parts. Stainless 303 or 316 for corrosion resistance. Send your model and target hardness, and Redstone confirms the steel family at the feasibility review.

Does Redstone heat-treat and harden steel in-house?

Yes. Heat treatment and hardening run in-house under the same program as machining. Through-hardening, case hardening, and stress relief are available, so the same supplier controls dimensions before and after hardening. Hardness is verified and documented before shipment.

What tolerances can Redstone hold on machined steel?

±0.001 inch standard on 3-axis and 4-axis machining, and ±0.0005 inch on 5-axis and qualifying programs. Critical features are verified by CMM, and first-article inspection is documented before volume release. Send your drawings and Redstone confirms the achievable tolerance against the feature and the steel at quoting.

What finishes are available on steel parts?

Black oxide for corrosion resistance and appearance, galvanizing for outdoor and structural parts, and nickel plating for wear and corrosion. Bead blasting and passivation on stainless are also available. Multi-step finish stacks run in-line. Redstone confirms the finish against your service environment at the quoting stage.

Can Redstone re-source an existing steel machining program from another supplier?

Yes. Send the existing drawings, inspection records, and current supplier quote. Redstone assesses feasibility, runs a parallel quote with the certified facilities, and projects landed-cost savings and lead-time impact before you commit. Heat treatment and finishing are folded into the same program so the part runs under one supplier.