GF-N profile
Anodised aluminium tube Ø 28 mm, the standard profile of the Green Frame tube system for workstations, flow racks and trolleys. 4000 mm bar or cut to length, 0.37 kg/m.
Green Frame · GF-N Ø 28 profiles
GF-N profile: Ø 28 mm aluminium tube for modular lean structures
The Ø 28 mm anodised aluminium tube on which almost the entire Green Frame system is built: workstations, flow racks, trolleys and lineside supermarkets. You order it as a 4000 mm bar or cut to length and join it with GF-N connectors, without welding. It weighs 0.37 kg/m and over a 1000 mm span it supports 195 N at the centre with a deflection of 5 mm.
Why choose it
The basis of the whole system
It accepts the entire range of GF-N connectors: flush internal, external, corner, 45°, hinged, rotating and sliding.
Light and as rigid as needed
0.37 kg/m: structures that are easy to move and modify, with the right rigidity for uprights and cross members of workstations and racks.
Cut to your dimensions
You receive it as a bar or already cut in our workshop, ready to assemble.
Reusable
When the process changes, loosen the connectors, move or shorten the tube and reassemble it elsewhere.
Choose it if…
- You build uprights, cross members and frames for workstations, racks, trolleys and guards.
- You want to use the entire range of GF-N connectors, including the flush internal ones.
- The cross members are short or lightly loaded: over a 1000 mm span it supports 195 N at the centre with 5 mm deflection.
- You want a light structure that is easy to modify over time.
Choose another solution if…
- You have long or heavily loaded cross members: the double tube fitted upright is about 10 times stiffer: GF-N W profile →
- You need to fix plate castors, panels or accessories with T-nuts: GF-N profile with C10 slot →
- You need a structure for high loads or large spans: GF-G profile →
Not sure which one to choose? Use the Green Frame quick guide →
Most used connectors and end caps
External 90° connector
Wraps around the tube: the most used joint for uprights and cross members.
View product →
External and internal 90° connectors hold 800 N against slipping along the tube: we calculate the joints on the design.
How you use it in the structure
Three practical rules for the standard tube:
The span matters
The load depends on the distance between the uprights: over 500 mm the tube supports 779 N at the centre, about four times that over 1000 mm, for the same deflection.
Cross member = overall dimension − 88 mm
Between two GF-N uprights with 90° connectors the tube length is the overall dimension minus 44 mm per side.
Reinforce where needed
Where the cross member is long or loaded, move to the GF-N W, the T or the Hard, or add a 45° brace.
Cantilever brackets and arms without a brace support little: the standard connector allows 9–11 N·m at the root of the arm.
The LeanProducts service
From drawing to finished structure, with a single point of contact:
Design and load calculation
We start from your sketch or dimensions: we choose profiles and connectors and check spans, joints and loads.
Cut to length
We cut the profiles in our workshop to the lengths in the design, ready to assemble.
Kit or assembled structure
You receive the kit with the cut parts and the list of components, or the structure already assembled.
Spare parts and modifications
When the process changes we supply components and new cuts to modify or extend the structure.
Send us a sketch, a photo or the overall dimensions: we will reply with codes, quantities and cut lengths.
Technical data
| Specification | Value |
|---|---|
| Part number | GFF-000 |
| Series | GF-N, Ø 28 mm tube |
| Diameter | Ø 28 mm |
| Length | 4000 mm bar or cut to length |
| Weight | 0.37 kg/m |
| Material and finish | Anodised extruded aluminium |
| Moment of inertia | Ix = Iy = 1.16 × 10⁴ mm⁴ |
| Section modulus | Zx = Zy = 0.83 × 10³ mm³ |
| Load at centre, 500 mm span | 779 N (about 79 kg) with 5/1000 deflection |
| Load at centre, 1000 mm span | 195 N (about 20 kg) with 5/1000 deflection |
| Suitable connectors | All GF-N connectors: internal, external, corner, 45°, hinged, rotating; mixed for GF-S and GF-G |
| End caps | Standard inner end cap GFA-400; alternatively aluminium GFA-E17, expanding GFA-C83, rounded GFA-404, ESD GFA-411; outer end cap GFA-401; protective cap |
Loads concentrated at the centre of a tube fixed at both ends with connectors, span measured between the uprights: in a structure, joints and supports also count, and we carry out the full check on the design.
Outer 90° connector GF-NOuter 90° connector
Inner 90° connector GF-NInner 90° connector
External 90° corner connector GF-NExternal 90° corner connector
GF-N inner end capStandard inner end cap
GF-N outer end capOuter end cap
GF-N protective capProtective capNot sure which profile to use?
Send us a sketch of the structure and the weight it has to support: we will tell you the profiles, connectors and cut lengths.