What types of assembly do you offer?

We offer mechanical assembly, electromechanical assembly, sub-assembly, full product builds, testing, and packaging services.

Can you source components we don't manufacture?

Yes, we can procure standard components, fasteners, electronics, and off-the-shelf parts to complete your assembly — managing the full bill of materials.

What is the minimum order for assembly services?

We accept assembly projects from single prototype builds to ongoing production runs. Quoting is based on assembly complexity and volume.

Do you provide functional testing?

Yes, we develop and execute functional test procedures based on your specifications, including electrical testing, leak testing, and dimensional verification.

How do you ensure assembly quality?

Documented work instructions, torque specifications, in-process quality checks, and final inspection ensure consistent assembly quality.

Can you handle custom packaging?

Yes, we offer custom packaging design, retail-ready packaging, protective packaging for shipping, and labeling services.

Custom Assembly Services

Professional precision parts assembly solutions
Multi-process collaborative & cross-process precision integration
Micron-level inspection (assembly tolerance ≤5μm)
Full-link data-driven process control

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Trusted by Engineers and Purchasing Leaders at the World's Most Successful Companies

15+Years in Business

500,000+Assembled Units Delivered

150+Component Types Managed

99.80%On-Time Assembly Delivery

ISO9001:2015 Certified

Trusted bynumerous companies

LS Manufacturing delivers precision custom assembly solutions with 99.8% on-time reliability, integrating complex components into production-ready systems for clients worldwide.

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Precision Assembly
Industry-leading production capabilities and strict quality inspection ensure precise fitting of all components, effectively optimizing product performance and service life.
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Fast Lead Time
By optimizing workflows and dedicated assembly areas, we promise efficient turnover to deliver products on time without compromising assembly quality.
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Experienced Technicians
LS Manufacturing has a team of skilled technicians—rigorously trained, highly experienced, and using professional methods to ensure consistent assembly quality.

Assembly Process

DFM (Design for Manufacturability) analysis and tolerance chain verification aligned with business needs are the core premise for ensuring assembly accuracy and efficiency.

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Design Overview

First, we conduct DFM analysis on your design, synchronously completing tolerance chain verification and assembly process adaptation evaluation. We identify potential dimensional interference and process conflicts in advance, and develop a detailed execution plan including process takt and tooling selection—laying the foundation for efficient connection between part manufacturing and assembly.

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Part Preparation

Before assembly, all parts pass first-article full-dimensional inspection (per GD&T standards) and undergo cleanliness control (compliant with ISO 16232 industrial cleanliness levels). We also verify the fit clearance and geometric tolerances of key parts to ensure all components meet assembly datum requirements, eliminating hidden risks for seamless assembly.

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Assembly

Our professional assembly team completes component assembly per preset process takt, relying on error-proof tooling and visual work instructions. We monitor key dimensions in real time via in-line gauges, ensuring the process capability index Cpk ≥ 1.33 to guarantee precise alignment and functional compliance of metal and plastic parts.

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Packaging & Delivery

After assembly, we use custom protective packaging (adapted to ISTA 3A transportation vibration standards) based on part precision levels, and attach traceability labels containing batch and inspection data. Through logistics lead time classification management, we ensure finished products arrive intact within the specified period, with full assembly process data traceable.

Assembly Methodsfor Parts

Process selection based on component characteristics and application scenarios is the key to ensuring assembly reliability.

Manual Assembly

Performed by technicians certified in ASME Y14.5 tolerance standards, it adapts to small-batch, high-complexity precision component assembly (e.g., customized modules with multi-dimensional fits). Digital measuring tools are used to real-time control assembly clearance, ensuring fit accuracy ≤ 0.02mm.

Molding Assembly

High-precision insert/overmolding processes are used, with insert tolerance controlled ≤ 0.05mm via mold locating pins to achieve integrated integration of plastic and metal parts. After molding, shear strength tests (per ASTM D732 standards) are performed to ensure structural stability of the assembly.

Mechanical Assembly

Threaded connections are executed with torque wrenches (±5% accuracy), and riveting processes monitor pull-out force (per GB/T 12617 standards). Welding processes comply with AWS D1.1 specifications, and non-destructive testing (penetrant inspection) verifies connection integrity to ensure long-term durability of mechanical joints.

Adhesive Assembly

Structural adhesives compliant with ASTM D1002 shear strength standards are selected, with adhesive layer thickness (0.1-0.3mm) controlled by dispensers. After curing, environmental adaptability tests (high-low temperature, humidity-heat cycling) are performed to ensure the stability of adhesive joints in working conditions, free of visible fasteners and assembly defects.

We Support Precision AssemblyNeeds Across All Scenarios

We have precision assembly capabilities for multi-category components, covering structural parts, functional parts, specialized equipment, etc. Relying on the GD&T tolerance control system and industry-specific process standards, we can accurately deliver assembly projects from regular components to high-complexity equipment, ensuring precision and reliability in every link.

Assembly Needs List:

Precision structural steel components (compliant with GB/T 1591 structural steel assembly tolerance standards)
Precision assembly of metal functional parts (meeting ASME Y14.5 geometric tolerance control requirements)
Accurate assembly of engineering plastic parts (adapted to ISO 2768 general tolerance specifications)
Integrated assembly of specialized industrial equipment (aligning with industry equipment assembly precision benchmarks)
Assembly of electrical functional components (meeting IEC 60204 electrical assembly safety specifications)
Assembly of high-complexity fixtures (ensuring ≤0.02mm fit clearance)