Assembly Line Workstation Aluminium Profile Frame 40×40 mm T-Slot Workbench Structure

OEM / ODM Available Free Sample Available ISO 9001:2015 EN 755-9 RoHS REACH

A re-configurable assembly workstation frame in 40 x 40 mm T-slot aluminium profile with 40 x 60 mm bench rails, in-slot cable routing and bolt-together construction.

Wholesale Price $3.60 - $6.80 / m per m

Material	Aluminium
Alloy Grade	6063-T5
Temper	T5
Section Size	40 x 40 mm post, 40 x 60 mm bench rail
Slot	8 mm groove, M8 slot nuts, 40 mm pitch, 4 faces
Length	6 m stock, cut to a workstation cutting list to +/-0.5 mm
Tolerance	EN 755-9 / GB/T 6892, wall +/-0.15 mm
Surface	Mill finish / clear anodised / black anodised
MOQ	100
Lead Time	18-28 days after deposit for mill finish
Loading Port	Shanghai / Ningbo
Supply Ability	300 t per month
Payment Terms	T/T 30% deposit + 70% before shipment \| L/C at sight
Trade Terms	FOB \| CIF \| EXW
Certifications	ISO 9001:2015 \| EN 755-9 \| RoHS \| REACH

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Framing systems · Assembly workstations

An assembly line workstation aluminium profile frame is a bolted structure built from 40 x 40 mm four slot T-slot extrusion, normally with a 40 x 60 mm beam for the bench rails and 30 x 30 or 40 x 40 mm for the upper tool rail and shelf supports. The 40 x 40 mm four slot section runs from about 1.30 kg/m in the light wall up to 2.35 kg/m in the heavy wall, and the 40 x 60 mm bench rail gives approximately 24 cm4 on edge and 13 cm4 laid flat. Everything is bolted, so the workstation can be re-configured on the shop floor without a welder.

What makes a workstation different from a machine frame is that it is designed to be changed. The product, the tooling and the operator all move, and the frame has to follow. That single requirement drives every decision on the page: the bench height is set by anthropometrics rather than by a round number, the cable routing is designed in rather than added later, and the assembly order has to leave the frame re-openable.

A 40 x 40 mm T-slot workstation: bench rails, tool rail and cable routing all carried in the same slot system.

Bench height is arithmetic, not preference

The work surface height follows the operator’s standing elbow height, and the rule changes with the type of work. Across a mixed adult population the standing elbow height falls roughly between 950 and 1,120 mm, with a working mean near 1,020 mm. From that single number the bench height for each class of work is a fixed offset, and getting the offset wrong costs throughput long before it costs anyone an injury.

Type of work	Rule relative to elbow height	Typical bench height	Why
Fine or precision assembly	50 to 100 mm below elbow	920 to 970 mm	Brings the work close so the eyes can judge detail without stooping.
Light assembly and inspection	0 to 50 mm below elbow	970 to 1,020 mm	Keeps the wrists straight and the shoulders relaxed.
General bench work	At elbow height	1,000 to 1,050 mm	Neutral posture with the forearms roughly horizontal.
Work needing downward force	150 to 250 mm below elbow	800 to 900 mm	Lets the operator use body weight rather than arm strength.
Seated work	200 to 300 mm above seat	680 to 760 mm	Set by the seat height, not by the elbow, when the operator sits.

Because the correct height depends on the operator and the task, a fixed welded bench is a compromise. A profile frame is not: the bench rails bolt into the slots at 40 mm pitch, so the working height can be moved in 40 mm steps and then trimmed continuously with adjustable feet. In practice you set the frame near the right height with the slot pitch and take out the last 20 mm of error with the feet, which is exactly the split that a 40 mm system with 50 mm of foot travel gives you.

Build the bench for the shorter operator. If a workstation is shared, set it for the smallest person who will use it and give the taller operators a platform to stand on, not the other way around. Lowering a bench is easy; stretching someone’s arms by 100 mm is not.

Three zones, three heights

A workstation is not one flat surface. It is three zones with different heights and different depths, and a frame that treats them as one ends up with parts and tools fighting for the same space.

Primary work zoneDirectly in front of the operator, within 250 to 350 mm of the front edge. This is the only zone that has to be at the calculated bench height.

Secondary zoneThe outer 200 to 300 mm of the bench top, used for parts trays and fixtures. Set 50 to 100 mm higher than the primary zone where possible.

Reach and storage zoneAbove the bench: the tool rail at 1,400 to 1,600 mm and the shelf at 1,800 to 2,000 mm. Anything heavier than about 2 kg should not be above shoulder height.

Under-bench zoneBelow 600 mm. Kept clear for the operator’s knees and for a drawer unit or a mobile bin trolley that can be rolled out.

Route the cables inside the slot, not around the frame

The single biggest reason shop-floor frames look untidy a year after installation is that the cables were run after the frame was built. The T-slot is a cable duct that comes free with the structure, and it has three accessories that make it work properly.

Run signal and power cable in separate slots Keep 24 V signal cable out of the slot carrying 230 V or motor cable. If they must share a route, cross them at right angles rather than running them parallel.
Break out of the slot at the end, not through the face A cable that leaves through the slot mouth is vulnerable to being pulled. Take it out at the profile end and fit a grommet or an end cap with a cut-out.
Cover the slots that carry cable A slot cover profile or a T-slot cover keeps swarf, coolant and dust out of the duct and stops the cable chafing on the slot mouth. Cover the loaded slots and leave the working slots open.
Use a reducing strip where a thin cable would rattle A T-slot reducing profile narrows the groove so a small-diameter cable or air line cannot move. It also lets you use the same slot for a cable and a fastener without them interfering.
Fix a dedicated earth stud, do not rely on the frame Anodised aluminium is an insulator. If the workstation needs an earth connection, bolt a bare metal earth stud to the frame and run a separate conductor. Do not assume the anodised frame carries it.

That last point is worth repeating because it is routinely missed. Anodising is a dielectric oxide layer, and a bolted joint between two anodised profiles is not a reliable electrical path. On an ESD workstation the grounding has to be a deliberate, separate connection — see the 40 series profiles and profile accessories ranges for the end caps, covers and reducing strips used above.

The assembly order decides whether the frame stays re-openable

Here is the mistake that catches almost everyone building their first profile frame. You assemble the four sides of a rectangle, tighten everything, and then try to add a cross member in the middle. The T-slot nut for that cross member has to slide in from the end of the rail — and the rail is now closed at both ends by the corner joints. The nut will not go in, and the only way forward is to take the frame apart again.

There are two fixes and both are worth knowing.

Pre-set nutsA pre-set nut is inserted into the slot from the side before the frame is closed. Load every nut you will ever need into the rail while it is still open, then build. Cheap and reliable, but you must plan the nut positions in advance.

Drop-in nutsA subsequent nut, also called a drop-in nut, is inserted through the slot mouth and turned 90 degrees to lock. It can be added to a closed frame at any time, which is what makes a workstation genuinely re-configurable. It carries slightly less load than a pre-set nut of the same size.

Anti-torsion drop-in nutsA variant with a serrated or ribbed body that resists rotating in the slot when a single bolt is tightened from one side. Use these where a drop-in nut has to take a one-sided load.

The practical rule for a workstation is: build the outer frame with pre-set nuts loaded at every position you already know about, and keep a bag of drop-in nuts on the bench for everything you add later. That combination gives you the load capacity of a pre-set joint where it matters and the flexibility of a drop-in joint everywhere else.

Frequently asked questions

What section should the bench rails be?

40 x 60 mm four slot on edge for anything up to about 1,500 mm between legs. It gives roughly 24 cm4 on edge against 13 cm4 flat, so the orientation matters more than the section. For a light bench under 1,200 mm, 40 x 40 mm heavy at 2.35 kg/m is adequate.

How much load can the bench take?

Treat the bench as a beam and check the deflection. A 40 x 60 mm rail on edge over a 1,500 mm span will hold a 200 kg evenly spread load inside a span divided by 200 limit. Point loads at mid-span need a separate check.

Can I move the bench later without buying new material?

Yes, that is the point of the system. Cut new rails and re-use the posts, or unbolt and re-assemble at a new pitch. The only parts that are normally consumed are the slot nuts and the fasteners.

Do you supply the frame as a flat-pack kit?

Yes. Send the workstation layout with heights, widths and the accessories you want and we will supply cut lengths, hardware, feet, end caps and covers as a kit with an assembly drawing.

Is an aluminium frame stiff enough for a torque tool?

For hand tools, yes. For a powered nutrunner with a reaction arm, the frame has to be sized for the reaction torque and anchored to the floor. Tell us the torque and the reaction point and we will size the rails and the base.

Send the workstation layout and the bench load

Tell us the bench height, the span between legs, the load and the accessories. We will size the rails and posts and quote the frame as a flat-pack kit with an assembly drawing.

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