Contact Us 
Home /
Precision Assembly Services for Custom Mechanical Parts
Karry Precision provides precision assembly services for CNC-machined parts, sheet metal components, and custom mechanical products. From simple component fitting to complete sub-assemblies, our team follows customer drawings, BOM requirements, work instructions, and inspection standards to ensure accurate fit, consistent quality, and reliable delivery.
-
Mechanical assembly for CNC-machined and sheet metal parts -
Support for fastening, press-fitting, bonding, and component installation
-
Assembly based on customer drawings, BOMs, and technical instructions
-
Dimensional, visual, and functional inspection before shipment
Get Free Quote
Assembly Support from Prototype to Repeat Production
-
Engineering support for assembly optimization
-
Seamless transition from prototype to production
-
Mechanical and component assembly capabilities
-
ISO 9001:2015-certified quality management system
Precision Assembly Services & Capabilities
Precision assembly of CNC-machined and sheet metal components using fastening, press-fitting, riveting, bonding, and hardware installation. Each assembly follows customer drawings, BOMs, and technical specifications.
From component preparation to final inspection, Karry Precision provides integrated assembly support for finished products. Visual, dimensional, and functional checks help ensure correct fit, reliable operation, and consistent quality before shipment.
We provide packaging services for machined parts, sheet metal components, assemblies, and prototypes, including protective wrapping, custom inserts, labeling, and export-ready packaging. Packaging solutions are tailored to part size, surface finish, quantity, and shipping requirements.
Typical Precision Assemblies & Components
-
Mechanical Housings -
Shaft and Bearing Assemblies -
Bracket Assemblies -
Gearbox Components -
Valve Assemblies -
Connector Assemblies -
Precision Fixtures -
Electronic Enclosures -
Medical Device Components -
Custom Mechanical Sub-Assemblies
Have a similar part to manufacture?
Get Free Quote
Materials We Work With for Assembly
-
. Metal .-
Aluminum Alloys
Lightweight, corrosion-resistant, and suitable for housings, brackets, frames, and precision mechanical assemblies.
Common Grades:- 6061
- 6063
- 5052
- 7075
Cost Efficiency:
-
Stainless Steel
Provides excellent strength, corrosion resistance, and durability for medical, industrial, and outdoor assemblies.
Common Grades:- 303
- 304
- 17-4PH
Cost Efficiency:
-
Carbon Steel
Strong, cost-effective, and widely used for structural components, brackets, shafts, and mechanical frames.
Common Grades:- 1018
- 1045
- Q235
Cost Efficiency:
-
Alloy Steel
Offers enhanced strength, hardness, and wear resistance for high-load mechanical assemblies and transmission components.
Common Grades:- 4140
- 4340
- 40Cr
- 42CrMo
Cost Efficiency:
-
Brass
Easy to machine and assemble, with good corrosion resistance and electrical conductivity for fittings and connectors.
Common Grades:- C360
- H59
- H62
Cost Efficiency:
-
-
. Plastic .-
POM
High rigidity, dimensional stability, and low friction make POM suitable for gears, bushings, guides, and moving assemblies.
Cost Efficiency:
-
Nylon
Strong, wear-resistant, and lightweight material suitable for gears, spacers, rollers, clips, and mechanical components.
Cost Efficiency:
-
PEEK
High-temperature, chemical-resistant engineering plastic used in aerospace, medical, and demanding industrial assemblies.
Cost Efficiency:
-
Polycarbonate
Impact-resistant and dimensionally stable, making it suitable for protective covers, housings, panels, and transparent components.
Cost Efficiency:
-
PTFE
Provides low friction, excellent chemical resistance, and electrical insulation for seals, washers, liners, and insulating components.
Cost Efficiency:
-
ABS
Durable, impact-resistant, and cost-effective for electronic housings, covers, brackets, and consumer product assemblies.
Cost Efficiency:
-
Explore our full material list or contact our engineering team for recommendations.
Surface Finishes for Assembled Components
Karry Precision offers a range of surface finishing options to improve the appearance, corrosion resistance, wear performance, and service life of machined and assembled components. The appropriate finish is selected according to the material, application environment, dimensional requirements, and visual specifications.
-
Anodizing
Anodizing creates a protective oxide layer on aluminum components, improving corrosion resistance, surface hardness, and appearance. Clear, black, and custom colors are available.
-
Hard Anodizing
Hard anodizing produces a thicker and harder oxide layer than standard anodizing. It is suitable for components exposed to friction, wear, or demanding operating conditions.
-
Powder Coating
Powder coating provides a durable and uniform surface with good resistance to corrosion, impact, and outdoor exposure. Different colors, textures, and gloss levels can be specified.
-
Electroless Nickel Plating
Electroless nickel plating applies a uniform metallic coating without electrical current. It improves corrosion resistance, wear resistance, and dimensional consistency on complex geometries.
-
Passivation
Passivation removes contaminants from stainless steel surfaces and strengthens the natural protective oxide layer. It improves corrosion resistance without significantly changing part dimensions.
-
Bead Blasting
Bead blasting creates a clean, uniform matte texture while reducing visible machining marks. It is commonly used as a final cosmetic treatment or before anodizing and coating.
*Not sure which finish is right for your part? Explore our complete guide
Precision Assembly Tolerances & Fit Guidelines
Tolerance control is essential in assembly because it directly affects component fit, alignment, movement, fastening reliability, and final product performance. At Karry Precision, assembly tolerances are evaluated according to part function, material properties, joining method, dimensional stack-up, and inspection requirements.
Tolerance Design Recommendations
- Apply tight tolerances only to function-critical interfaces
- Use suitable clearance for sliding and removable components
- Define interference values clearly for press-fit assemblies
- Control datum relationships between mating components
- Consider tolerance stack-up across multiple assembled parts
- Allow for coating, plating, and adhesive thickness
| Assembly Requirement | Typical Tolerance | Suitable Applications | Cost Impact | Assembly Considerations |
| General Component Alignment | ±0.10–0.20 mm | Covers, brackets, frames, and housings | Low | Suitable for non-critical mechanical assemblies |
| Precision Component Alignment | ±0.05–0.10 mm | Shafts, bearings, guides, and precision housings | Medium | Requires controlled datums and dimensional inspection |
| Hole-to-Hole Alignment | ±0.05–0.15 mm | Bolted assemblies, panels, and mounting brackets | Medium | Hole clearance should accommodate accumulated positional variation |
| Sliding Fit Clearance | 0.02–0.10 mm | Shafts, guides, bushings, and movable components | Medium | Clearance depends on material, lubrication, temperature, and required movement |
| Press-Fit Interference | 0.01–0.05 mm | Bearings, pins, bushings, and inserts | Medium to High | Interference must be selected according to diameter, material, and wall thickness |
| Gap and Flushness | 0.10–0.30 mm | Enclosures, covers, panels, and cosmetic assemblies | Medium | Visual requirements may require fixtures and additional inspection |
| Adhesive Bond-Line Thickness | 0.05–0.20 mm | Bonded housings, panels, and mixed-material assemblies | Medium | Controlled adhesive thickness helps maintain consistent bond strength |
| Threaded Assembly | According to Drawing | Screws, inserts, studs, and fasteners | Low to Medium | Thread engagement, tightening torque, and locking method should be specified |
These values are general assembly references. Final requirements depend on component size, material combination, joining method, surface treatment, operating temperature, and functional requirements.
Not sure about the right tolerance for your part?
Get Free Quote
Our Precision Assembly Process
-
STEP 1
Drawing & BOM Review -
STEP 2
Incoming Component Inspection -
STEP 3
Component Preparation & Kitting -
STEP 4
Precision Assembly -
STEP 5
Functional & Fit Testing -
STEP 6
Final Inspection, Packaging & Labeling
Precision Assembly & Manufacturing Guides
Precision Assembly Services FAQs
Ready to Start Your Precision Assembly Project?
Upload your assembly drawings, BOM, 2D/3D files, and inspection requirements to receive engineering feedback and a quotation.
Get Free Quote
Why Choose Karry for Precision Assembly Services?
Karry Precision provides integrated assembly services for CNC-machined parts, sheet metal components, engineering plastics, and standard hardware. Our team follows customer drawings, BOMs, work instructions, and inspection requirements to deliver consistent, ready-to-use assemblies.
-
Engineering support for assembly and tolerance optimization
-
Mechanical assembly, press-fitting, fastening, riveting, and bonding
-
Support from prototype assembly to repeat production
-
Incoming, in-process, and final quality inspection
-
Functional testing and dimensional verification available
-
Custom packaging, labeling, and shipment preparation
