Stainless Steel Machining for Custom Equipment Parts

Custom sleeves, mounts and connectors for equipment prototypes, small batches and repeat orders. Great Machining combines in-house CNC milling, turning and dimensional inspection with specialist finishing to supply parts made to your drawing.

Specified grades. Functional fits. Agreed inspection records.

Illustration of a stainless steel sleeve, mounting block and threaded connector

Stainless steel part geometries — illustrations.

Stainless Steel Parts for Your Equipment

We manufacture components for automation, instruments and industrial equipment, from a single prototype to planned repeat orders.

Illustration of a short stainless steel sleeve showing its bore and end face

Sleeves and Spacers

Turned locating and spacing components with concentric bores, outside diameters and end faces. Fitting surfaces and bore entrances follow the drawing.

Illustration of a machined stainless equipment mount with counterbored and side holes

Equipment Mounts

Milled blocks, brackets and instrument supports. Locating faces, pockets and hole positions form the mounting interface with your equipment.

Illustration of a stainless connector with wrench flats, a threaded end and through bore

Threaded Connectors

Adapters with threads, shoulders, flats and cross-holes. Combined turning and milling produces transverse features; thread form, tolerance class and engagement length follow the drawing.

Component geometry illustrations.

Stainless Steel Grades and Material Conditions

We source stock to the agreed grade, material specification and supplied condition. The drawing takes priority; a material change requires approval before production.

Grade Stock and part fit Selection boundary
303 Free-machining bar for turned sleeves, connectors and threaded parts. Use only when specified or approved, with suitable service environment and joining requirements. Easier cutting does not authorize substitution.
304 Bar or plate for general equipment mounts, brackets and instrument parts. Match the material standard, supplied condition and joining requirements. A 304 callout does not automatically permit 304L.
316L Bar or plate for more demanding corrosion requirements, including chloride-bearing service. Suitability depends on medium, concentration, temperature, crevices and surface condition. Agree passivation and material documents for the order.

Stock and part fit

Free-machining bar for turned sleeves, connectors and threaded parts.

Selection boundary

Use only when specified or approved, with suitable service environment and joining requirements. Easier cutting does not authorize substitution.

Stock and part fit

Bar or plate for general equipment mounts, brackets and instrument parts.

Selection boundary

Match the material standard, supplied condition and joining requirements. A 304 callout does not automatically permit 304L.

Stock and part fit

Bar or plate for more demanding corrosion requirements, including chloride-bearing service.

Selection boundary

Suitability depends on medium, concentration, temperature, crevices and surface condition. Agree passivation and material documents for the order.

Drawing specifies 316? Send that exact requirement. We source against the requested specification and documents; 316L is not an automatic substitute.

Higher-strength stainless parts: 17-4PH is a separate option with a specified heat-treatment condition, processing sequence and final dimensional checks.

Machining Functional Features in Stainless Steel

Work hardening, chip formation and tool wear affect stainless surfaces and burrs. Our machining and inspection plan focuses control on the features that locate, connect and fit your assembly.

Bores, Shafts and Mating Faces

We turn and finish fitting diameters, shoulders and end faces with agreed first-piece, process and final checks. Each critical dimension has its own tolerance.

Pockets, Holes and Mounting Interfaces

We mill locating faces, accessible pockets and hole patterns. Access, corner radii, pocket depth and wall support govern machining; geometry changes require approval.

Threads and Edges

We machine and check threads to specification. Controlled deburring protects drawing-defined chamfers and functional edges at bore entrances, cross-holes and intersections.

316L Sleeve: Fits, Finish and Final Checks

For an automation OEM, we machined a 100-piece batch of 316L sleeves: nominal outside diameter 18 mm, nominal bore 10 mm and length 45 mm. The project kept three acceptance requirements separate.

Illustration of a slender straight 316L sleeve with a through bore and chamfered edges

Outside Diameter

18.000 ±0.010 mm.

Bore

10.000–10.020 mm.

Selected Fitting Surfaces

Ra ≤0.8 μm. This requirement applies to the designated fitting surfaces rather than every surface on the sleeve.

The route combined turning, finishing of the fitting surfaces and controlled deburring. Post-passivation checks recorded the agreed features, with the drawing revision and material lot linked to the order.

Sleeve geometry illustration.

Have a similar fit to manufacture? Start with a drawing, CAD file, sample or useful part description, plus quantity or project stage when known.

Surface Finishing and Passivation

We supply machined and deburred parts and coordinate specialist treatments through selected finishing partners. Choose the finish for the part’s functional and appearance requirements.

As Machined and Deburred

For functional components where machining marks are acceptable. Critical roughness, chamfers and edge breaks follow the drawing.

Bead Texture or Mechanical Polish

For appearance surfaces or a defined surface condition. Agree texture, polishing direction and protected functional faces; appearance and measured roughness are separate requirements.

Passivation

For applicable parts requiring a specified cleaning and passivation process. The order defines the treatment, appearance criteria and process documents. Passivation does not replace dimensional finishing or cosmetic polishing.

Fitting diameters, threads and critical faces remain subject to the agreed finished-part acceptance requirements, including final dimensional or surface checks where specified.

What Drives Stainless Steel Machining Cost

Compare quantity and machining options while keeping the approved drawing grade fixed.

Setup and quantity: Programming and workholding costs are spread across the batch. Repeat pricing also depends on the approved revision and production schedule.

Geometry and stock removal: Deep pockets, difficult access, slender features and extra setups can add machining time or tooling needs.

Acceptance and finishing: Functional tolerances, burr control, specialist finishes and inspection documents contribute to the quoted scope.

Illustrative Time and Tooling Calculation

All inputs below are assumptions. They are not our rates, measured machining trials, sleeve-project costs or a quotation.

Added machining time: Assume 100 pieces and 1 minute per piece of added cutting time at €60 per hour. 100 × 1 = 100 minutes; 100 ÷ 60 × €60 = €100 per batch / €1 per piece in added machining cost.

Cutting-edge allocation: Assume €12 per usable edge and 20 accepted parts per usable edge. €12 ÷ 20 = €0.60 per accepted part in tooling allocation.

These calculations exclude material, setup, handling, finishing, inspection, scrap, packing, shipping and taxes. Actual time and tool consumption depend on grade, stock condition, geometry and machining route; there is no universal stainless-grade price multiplier.

Request a Quote for Your Stainless Steel Parts

Start with a drawing, CAD file, sample or useful part description, plus quantity or project stage when known. STEP and PDF files are helpful; an early inquiry can begin before the grade or drawing is finalized.

Helpful for quotation, when available:

  • Drawing revision, exact grade, material standard and condition, or operating environment if the material is open.
  • Quantity tiers, critical dimensions, fits, tolerances, threads, edges and surface finish or passivation.
  • Material and inspection documents, delivery country and requested date.

Send what you have; we will clarify the details needed for a quotation.

01 — Share Your Part

Send your available files or describe the component and intended use.

02 — Receive an Engineering Quotation

We quote material, machining, finishing, inspection and delivery after technical clarification. You approve the requirements before production.

03 — Manufacture, Inspect and Dispatch

We coordinate machining and specialist processes, complete the agreed checks and dispatch the parts with specified labels and documents.

Stainless Steel Machining Questions

We treat them as distinct requirements. Any proposed equivalence or dual-certified material must be accepted against the applicable specification, documents and project requirements.

Material documents, dimensional reports, a certificate of conformance and specialist-process records are agreed per order. Full-dimensional or formal first-article reporting requires a separate scope.