Capability

Automatic Assembly

Sub-assemblies built by machine, not by hand

Screw + washerSpring pinsConsistent assemblyFewer line operations

Automatic Assembly · Bekasi plant

Process overview

Sub-assemblies built by machine, not by hand

Many fasteners are not used as single parts. A screw with a captive washer, a screw with a sealing ring, a spring pin pressed into a housing — each of these is a small assembly that somebody has to build. Building it at the fastener plant rather than at the customer line removes an operation, a stock item and a chance for the assembly to be done incorrectly.

Automatic assembly is the step that makes this practical at volume. Spring pin assembly is one of the equipment patents in the group, and the same principle applies across the range: the sub-assembly is built by a machine that repeats the same motion with the same force, which is more consistent than a manual station and does not depend on the operator remembering a step.

Step by step

How the process runs

Each step has a defined control point. The sequence is not arbitrary — changing it changes the result.

Sub-assembly design review

The assembly is reviewed for whether it can be built by machine and whether it will survive handling and shipping as one part.

Component feeding

Screws, washers, seals and pins are fed in the correct orientation so the station never assembles a reversed part.

Automatic assembly

The station presses, threads or seats the components with a controlled force and stroke.

In-process check

Assembled parts are checked for presence and seating so that a missing washer is detected at the station rather than at the customer.

Packing

Sub-assemblies are packed in a format that suits the customer feeder, so they arrive as a single part number.

Specification

Process window and capability

The numbers below define what the process can hold repeatably. They are not laboratory bests.

Sub-assemblies

Screw with washer, screw with sealing ring, screw with captive element, spring pin assemblies

Method

Automatic station with controlled force and stroke

Consistency

Same motion and force on every part, independent of operator

Detection

In-process presence and seating check

Benefit to customer

One part number instead of several; one line operation instead of several

Equipment patents

Spring pin assembly (+30% efficiency), sorting and packaging (+35% efficiency)

Equipment

What the line is built on

Capacity figures are per machine and assume a standard part. Complex geometry reduces throughput.

Equipment	Specification
Automatic assembly stations	Screw, washer, seal and pin sub-assembly
Spring pin assembly	Patented automatic assembly — efficiency increased by 30%
Automatic product sorting and packaging	Patented line — efficiency increased by 35%

Process control

What is checked, and when

A control that is not recorded is not a control. Each item below generates a record linked to the lot code, retained for the programme duration.

Quality & certifications

Component presence verified at the station

Assembly force and stroke monitored

First-off assembly checked before the run continues

Sample pull-apart or seating check per lot

Packing format verified against the customer feeder specification

Questions

Automatic Assembly FAQ

Practical questions from sourcing and engineering teams.

Considering a process change? If a tolerance or finish is not achievable on our current line, we will say so before quoting rather than after the first lot.

Why buy a sub-assembly instead of the parts?

Because it removes an operation and a stock item from your line, and it removes the possibility of the assembly being done incorrectly. One part number arrives, and it goes into the feeder as one part.

Can a screw and sealing ring be supplied assembled?

Yes. Sealing rings and captive elements can be assembled onto the screw so that the line receives a single sealed fastener rather than two components that must be mated at the station.

How is a missing component detected?

By an in-process check at the station, so a part without its washer or seal is rejected during assembly rather than being found at the customer. Detecting it at the station is far cheaper than detecting it after shipping.

Does automatic assembly change the part?

It can affect the finish at the assembly point and it adds a handling step, so the sub-assembly is reviewed for whether it survives packing and feeding. That review happens before the process is set up, not after.

Related capabilities

What happens before and after

These processes are usually sequenced with the one above.

Capability

Cold Forging

Single- and multi-station cold heading forms the screw from wire, so the grain follows the part contour and no material is machined away.

Bulk micro screws prior to optical sorting

Capability

Optical Sorting & Packing

Vision and laser sorting inspects every screw for head, recess and dimensional defects, and packs the accepted parts in the format the customer feeder needs.

Plated socket head screws inspected in the laboratory

Capability

Inspection Laboratory

Metallography, hardness, dimensional measurement, tensile, friction, salt spray, coating thickness and RoHS testing, all in-house so a question can be answered without waiting for an outside lab.

Need automatic assembly for your part?

Send the drawing and the annual volume. We will confirm feasibility, tolerance and lead time in the quotation.

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