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Shafts & Pins
Stepped shafts, locating pins, spindles and journals for motion, positioning and mechanical assemblies.
Engineering Focus: Bearing fits, mating diameters, shoulders, grooves and runout relative to specified datums.
Custom Machined Metal Parts
Made to your drawings. Built around fit and function.
GPT Precision manufactures custom metal components, including precision shafts, sleeves, housings, brackets, mounting plates and tooling parts.
We review material specifications, machining methods, critical dimensions, finishing and inspection in relation to how the component fits and functions within its assembly.
From prototypes to production batches and repeat orders, we manufacture to customer drawings and agreed specifications.
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Custom Metal Part Categories
Find the components closest to your project.
Identify the closest part category, then highlight the interfaces that control fit, movement and assembly.
Turned & Cylindrical Components
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Sleeves, Rings & Flanges
Bushings, spacers, collars, rings and flanges that locate, separate, connect or support adjoining components.
Engineering Focus: Bore-to-OD relationships, wall thickness, face alignment and mounting patterns for accurate fit and assembly.
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Small Turned Components
Connector pins, instrument shafts and small-diameter sleeves with slender sections, fine threads or closely spaced features.
Engineering Focus: Workpiece support, tool access, burr control, dimensional relationships and secure handling during machining and inspection.
Milled & Structural Components
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Корпуса & Bodies
Equipment housings, pump bodies and machined enclosures with pockets, bores and mounting interfaces.
Engineering Focus: Bore size and position, sealing surfaces, internal clearances and relationships to external reference faces.
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Brackets & Supports
Mounting brackets, structural supports, arms and adapters that carry loads, connect components or establish their position.
Engineering Focus: Hole patterns, mounting faces, stiffness, alignment and assembly clearance.
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Plates & Bases
Mounting plates, fixture bases, equipment plates and mold plates with locating holes, pockets or internal passages.
Engineering Focus: Flatness, parallelism, hole positions and mounting interfaces that establish assembly references.
Инструментальная оснастка & Inspection Components
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Mold Inserts & Cores
Cavity inserts, core inserts, core pins and related tooling components with working profiles and mating surfaces.
Engineering Focus: Material grade, hardness, profile geometry and functional surfaces, with machining, heat treatment and finishing sequenced as required by the design.
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Gauges & Fixtures
Inspection gauges, machining fixtures and assembly jigs for locating, supporting or checking specific components.
Engineering Focus: Locating datums, repeatable positioning, contact surfaces, wear and the intended checking function. Gauge calibration and traceability documentation are agreed separately where required.
A Manufacturing Route Built Around Your Part
The process sequence matters as much as the individual operation.
Turning establishes rotational features; milling creates flats, pockets and off-axis details. Grinding can address tighter dimensional, geometric or surface requirements where appropriate.
We evaluate material condition, workholding, machining access and datum relationships to establish the sequence. When multiple setups are required, workholding and datum transfer are planned to maintain the dimensional relationships specified on the drawing. Multiple processes do not necessarily mean a single setup.
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| Part Features | Manufacturing Approach |
|---|---|
| Turned diameters with milled features | Coordinate turning and milling for flats, slots, cross-holes and off-axis details. Plan workholding and datum transfer to maintain their relationship to the turned features. |
| Housings with precision bores | Sequence bore machining and finishing around mating diameters, positional tolerances, mounting faces and assembly access. |
| Features requiring precision grinding | Evaluate dimensional tolerance, geometric accuracy, surface roughness and material condition separately to identify where grinding adds value. |
| Deep holes and intersecting passages | Assess depth-to-diameter ratio, tool access, internal burr removal and inspection access. Cleaning, pressure testing and leak testing require separate scope confirmation. |
| Hardened tooling and wear components | Coordinate machining, heat treatment and final finishing, allowing for material movement and dimensions specified in the hardened condition. |
The objective is not to use more processes, but to achieve the specified features in their required finished condition.
Materials for Custom Machined Metal Parts
Select the grade, condition and manufacturing route together.
Material choice affects strength, weight, corrosion, wear and processing. The specific grade and condition guide cutting strategy, distortion control and finishing.
| Material Family | Selection and Manufacturing Considerations |
|---|---|
| Aluminum Alloys | Weight and strength needs, machining stability and compatibility with the specified anodized finish |
| Stainless Steels | Corrosion resistance, mechanical properties, cutting behavior and final surface condition |
| Carbon & Alloy Steels | Strength, wear resistance, heat-treatment response and dimensional stability |
| Copper, Brass & Bronze | Conductivity or bearing properties, machinability and surface requirements, depending on the alloy |
| Titanium Alloys | Strength-to-weight needs, corrosion resistance, tool access and machining strategy |
| Tool Steels & Specialty Alloys | Hardness, wear, supply condition and the sequence of machining, treatment and finishing |
Specify the exact grade, material standard, supply condition and required hardness. For heat-treated components, state when the properties apply and which dimensions must be maintained after treatment. This helps establish machining allowances and the final finishing sequence.
Availability, sourcing and suitability are confirmed for the selected grade. If alternatives are acceptable, identify the mechanical, chemical or functional properties that must remain unchanged; similar material names alone do not establish equivalence.
Critical Dimensions, Fit & Инспекция
Define what each feature controls—and how it will be checked.
Shaft runout, housing bore position and base-plate flatness each serve different assembly needs. Define their reference features and acceptance criteria to guide manufacturing and inspection.
Dimensions & Fits
Mating diameters, bores, threads, shoulders and clearances determine how components locate, connect or move. Identify bearing fits, sealing interfaces and alignment features explicitly. Where general tolerances apply, identify the relevant standard and tolerance class. Specify individual limits wherever general tolerances do not adequately define a critical feature.
Geometric Accuracy & Datums
Geometric tolerances control characteristics that size tolerances alone cannot fully define. Flatness, circularity and cylindricity address feature form, while parallelism, perpendicularity, position and runout control orientation, location or variation relative to specified references, as applicable.
Functional datums help establish how critical features are related and verified. Manufacturing setups and inspection methods are planned around the drawing's specified controls.
Surface Roughness & Functional Surfaces
Specify roughness separately from size and geometry. Bearing seats, sliding interfaces and sealing faces can need different surface conditions. Identify the relevant values, measurement requirements and any texture or lay direction that matters; distinguish these functional requirements from cosmetic appearance.
Инспекция & Acceptance
Match the inspection method to the feature and tolerance. Verification can include CMM inspection, optical measurement, dimensional gauges or dedicated fixtures. Agree sampling, first-article checks, reporting and supporting documents during quotation; the method and coverage are not automatically identical for every part.
Surface Finishing & Heat Treatment
Plan for the delivered surface and material condition.
Define finishing and heat treatment before fixing the manufacturing sequence: they affect appearance, corrosion, wear and the dimensions of close-fitting interfaces.
Поверхностная обработка & Coatings
Options include anodizing, chemical conversion coating, passivation, electroplating, powder coating and painting, subject to material compatibility. Specify coating thickness, preparation, masking and appearance. Threads, bearing seats and electrical contact areas need particular attention when treatment changes their fit or function.
Mechanical Surface Finishing
Blasting, brushing and polishing provide surface preparation, texture or appearance. Identify cosmetic areas separately from functional surfaces, and state which edges or features must be protected. The finishing method should preserve the specified dimensions and surface characteristics.
Heat Treatment & Hardness
Specify the material, treatment standard, required hardness and dimensions controlled after treatment. Potential movement influences machining allowances and whether final machining or grinding follows heat treatment. Inspection should address the agreed finished condition.
From First Samples to Repeat Production
Clear specifications connect development, production and ongoing supply.
Drawing revision, material and acceptance criteria establish the reference for each order. Prototype, batch and repeat orders have different objectives and approval needs.
Prototypes & Initial Samples
Validate fit, function and critical design details.
Define what the sample must demonstrate—assembly fit, movement, sealing, appearance or another characteristic. Identify any material, finish or inspection differences from the intended production part so the evaluation reflects those limitations.
Production Batches
Manufacture against approved specifications and agreed inspection criteria.
Establish quantities, process sequence, acceptance checks and delivery needs. Include first-article inspection or sample approval where required. Any deviations affecting the approved requirements must be resolved or formally accepted by the customer before the relevant production release.
Repeat Orders & Engineering Changes
Maintain revision control and evaluate changes before subsequent production.
Use the approved drawing, материал, finish and acceptance criteria as the reference. Changes to geometry, материал, tooling, process or finishing are assessed for their effect on fit, manufacture and verification; additional validation is agreed where needed.
What to Share for a Metal Parts Quote
Send the available files and flag any open decisions.
- Drawing or 3D model:
- Part geometry, revision and dimensioned details where available.
- Material and finish:
- Grade, supply condition, hardness, coating and final surface requirements.
- Quantity:
- Initial samples, production batch sizes and expected repeat demand.
- Critical features:
- Fits, datums, tolerances, threads and functional surfaces.
- Inspection and delivery:
- Acceptance criteria, required documents, target date and destination.
Часто задаваемые вопросы
Is my part better suited to machining or sheet metal fabrication?
Machining suits solid components with bores, pockets and controlled assembly interfaces. Sheet metal fabrication suits panels, covers and formed parts made from sheet. Some components combine both. The choice depends on geometry, материал, quantity and function, including which surfaces or interfaces require subsequent machining.
Can you manufacture metal grades that are not listed?
Send the exact grade, material standard and required supply condition or hardness. We assess sourcing, machinability and any special processing needs before confirming the scope. If substitutions are acceptable, state the properties that must be preserved so an alternative can be evaluated against the same criteria.
Can I request a quote with only a 3D model?
Yes. Send the model, intended application and known specifications. A dimensioned drawing is recommended for critical fits, datums, threads and surface finishes. Any information the model does not define—including material and acceptance criteria—must be clarified before manufacture. Flag open design decisions when submitting the enquiry.
Can a single part require turning, milling and grinding?
Yes. Several operations can be needed to produce the geometry, fits and surface condition. The sequence depends on material, workholding, tool access and critical feature relationships. We establish the route for the individual drawing.
Can you provide material certificates and inspection reports?
Include the documents, standards and reporting formats you need with the enquiry. Material certificates, dimensional reports and traceability arrangements are confirmed during quotation, together with inspection coverage.
Can you quote prototype and production quantities together?
Yes. Provide initial sample quantities, planned batch sizes and expected repeat demand. Identify differences in material, finish, inspection or documentation between stages. This allows quotations to distinguish one-time preparation from recurring production work and compare the requested quantities against a clearly defined supply scope.
Custom Metal Parts, Manufactured to Your Specifications
Отправьте ваш чертёж, expected quantity and critical assembly features. GPT Precision will assess the manufacturing scope and clarify the details needed for quotation.
