4040 T-Slot Aluminum Extrusion Profile
The most versatile 40×40mm modular framing profile for machine building and automation.
Product Overview
If you've ever built a machine frame, you know the frustration of drilling holes in the wrong place, realizing the bracket doesn't quite fit, and spending half a day reworking a structure that should have taken an hour. That's the problem the 4040 T-slot profile was designed to solve — and it does so elegantly.
The 4040 is the workhorse of industrial aluminum framing. At 40×40mm with four T-slots running along each face, it lets you bolt, clamp, or attach accessories anywhere along its length without touching a drill. Need to move a sensor bracket 50mm to the left? Loosen two bolts, slide, retighten. Done in 30 seconds. That kind of flexibility isn't a luxury in a busy production environment — it's a necessity.
We manufacture our 4040 profiles from AA 6063-T5 alloy, which gives you the right balance: strong enough for most machine frame applications, light enough to keep your structure manageable, and with a surface quality that anodizes beautifully. The extrusion tolerance meets GB/T 5237.1 Class A — meaning the slot width is consistent enough that your T-bolts engage cleanly every time, not just on the first profile from a batch.
In Southeast Asia, we see this profile used everywhere: Vietnamese electronics factories building ESD-safe workstation frames, Thai food processing plants constructing conveyor guards, Indonesian automotive suppliers assembling fixture tables. The common thread is that these customers need structures they can build fast, modify easily, and trust to stay square under daily use.
One thing buyers often overlook is the importance of consistent slot geometry across a large order. If the slot width varies between batches — even by 0.3mm — your drop-in nuts won't engage properly, and you'll spend time on the factory floor filing slots or forcing connections. We run 100% slot-width checks on every production run, and we'll provide the measurement data in the quality report if you ask for it.
The 4040 pairs with our full range of accessories: M6 T-bolts, drop-in nuts, 90° corner brackets (internal and external), end caps, cable management clips, and leveling feet. If you're building a complete frame system, we can supply the accessories alongside the profiles in a single shipment, saving you the headache of sourcing from multiple suppliers.
Lead time from Qingdao is 15–20 working days for standard orders. For large-volume orders (10+ tons), we can discuss a blanket order arrangement with scheduled releases — useful if you're running a production line that consumes profiles continuously.
Technical Specifications
| Cross Section | 40 × 40 mm |
|---|---|
| Slot Width | 8 mm |
| Weight | 1.08 kg/m |
| Moment of Inertia Ix | 4.12 cm⁴ |
| Section Modulus Wx | 2.06 cm³ |
| Alloy / Temper | AA 6063-T5 |
| Min Wall Thickness | 1.8 mm |
| Standard Length | 6,000 mm |
| Tolerance | Class A, GB/T 5237.1 |
| Max Load (1m span, UDL) | 520 N/m |
Compatibility, Assembly and Order Controls
For modular framing, a nominal outer size is not enough to establish compatibility. Confirm the supplied section drawing, slot geometry, core-hole arrangement, connector family and cut/machining references before a mixed-series order is released.
Information for an Accurate Inquiry
- Cross-section or assembly drawing
- Profile reference and accessory family
- Cut list / BOM with revision
- Load and span context where relevant
- Finish, quantity, packing and destination
Related Engineering Guides
- T-Slot Compatibility: Slot Geometry, Nuts and Connectors — Measure before mixing profile or accessory series.
- Aluminum Frame Deflection: Loads, Spans and Supports — Use for project-specific frame review.
- How to Prepare a BOM for an Aluminum Machine Frame — Turn a frame drawing into a controlled order list.
- Cut-to-Length T-Slot Profiles: Specification Guide — Specify cuts, holes, threads and datums.
Request a Technical Quote
For drawings, MTRs, samples, pricing, and lead time, contact Andy: WhatsApp +86 151 1618 3980 or lkvicky2003@gmail.com. Please include profile reference, alloy/temper, surface finish, quantity, and destination port.