GF-S Hard profile

Name: GF-S Hard profile
Brand: LeanProducts
SKU: GFF-404

High-strength Green Frame Ø 19 mm tube: almost double the moment of inertia of GF-S and M8 threadable end for levelling feet. 0.56 kg/m, 4000 mm bar or cut to length.

GF-S Hard profile: high-strength Ø 19 mm tube

The high-strength version of the GF-S tube: same 19 mm diameter, thick wall and a central bore that can be threaded M8 at the end to screw in levelling feet. It weighs 0.56 kg/m and has almost double the moment of inertia of the standard GF-S.

Ø 19 mmHigh strengthM8 threadable end0.56 kg/mFor light legs and uprights

0.51 × 10⁴ mm⁴moment of inertia

× 1.9compared with the standard GF-S

M8thread at the end

0.56 kg/mweight

Why choose it

Stiffer in the same diameter

Almost double the moment of inertia of GF-S, without changing size.

Screw-in feet

The end is threaded M8: you screw in levelling feet without a threaded insert.

Light legs

Suitable for legs and uprights of small GF-S structures, with the foot screwed in directly.

In the GF-S series

Same diameter as GF-S: you use it only where needed.

Choose it if…

A Ø 19 leg or upright needs to be stiffer.
You want to screw an M8 foot directly into the tube.
You want to stay with the 19 mm diameter.

Choose another solution if…

The standard light tube is enough: GF-S profile →
You need more stiffness, with a 44 mm wide twin Ø 19 tube: GF-S W profile →
The load calls for a Ø 28 tube: GF-N profile →

Not sure which one to choose? Use the Green Frame quick guide →

Application example

The GF-S Hard is used at the most stressed points of light structures:

Legs of small workbenches and supports, with M8 foot at the end
Uprights of GF-S frames that carry accessories
Mechanism parts that must bend little

How you use it

Where the Hard is really needed:

Thread the end

At the end, the central bore is threaded M8: you screw in levelling feet and other components with an M8 stem.

Instead of GF-S

Same diameter: you substitute it for the standard tube only at the most heavily loaded points.

Connectors

You connect it with GF-S connectors: we will confirm the suitable models on the project.

With your cutting order, tell us which pieces need threading at the end.

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-404
Series	GF-S, Ø 19 mm tube
Diameter	Ø 19 mm, central bore Ø 6.8 mm
Length	4000 mm bar or cut to length
Weight	0.56 kg/m
Material and finish	Anodised extruded aluminium
Moment of inertia	Ix = Iy = 0.51 × 10⁴ mm⁴
Section modulus	Zx = Zy = 0.54 × 10³ mm³
End	Threadable M8 for feet and adjusters
Suitable connectors	GF-S Ø 19 connectors (models to be confirmed on the project)
End caps	Dedicated inner end cap GFA-443

The permissible load depends on span, profile orientation and joints: send us dimensions and weights and we will check the structure.

Related products

GF-S profileStandard GF-S profile

GF-S W profileGF-S W profile, stiffer

Plastic levelling footFeet with M8 stem

GF-N profileGF-N profile, for higher loads

Any other questions?Read the 15 frequently asked questions →

Not 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.

Request a quote Call +39 0434 572757

Specifications

Length	4000
Material	Anodised extruded aluminium
Weight	0.56 kg/m

Tags
Tags	SUS

The diameter is the same, 19 mm, but the GF-S Hard has a thick wall: it weighs 0.56 kg/m instead of 0.20 and has almost double the moment of inertia (0.51 against 0.27 × 10⁴ mm⁴). The end can be threaded M8.

Yes: the central bore at the end is threaded M8 and you screw in a levelling foot or other components with an M8 stem, without a threaded insert. Let us know with your cutting order.

For legs and uprights of light structures that need to bend less or carry a screwed-in foot. The rest of the structure stays in the lighter standard GF-S.

The GF-S W profile joins two Ø 19 tubes into a 44 mm wide profile: mounted upright it has a moment of inertia of 2.87 × 10⁴ mm⁴, more than five times the Hard. Beyond that you move to GF-N Ø 28.

GF-S Ø 19 series connectors: we will confirm the suitable models when we prepare the component list.

With the inner end cap dedicated to GF-S Hard, GFA-443: the standard GF-S end cap is not suitable for this profile. If you fit a foot at the end, the end cap is not needed.

The GF-S profile is the basic Ø 19 tube. The one with C6 slot adds a slot for slot nuts, hooks and accessories. The Hard has a thick wall, almost double the moment of inertia and an M8 threadable end for feet. The W joins two tubes into a 44 mm wide profile, more than 10 times stiffer when mounted upright. F35 and F22 have a flat flange for labels, tags and light supports.

The GF-N Ø 28 is the standard for workstations, flow racks and trolleys. The GF-S Ø 19 weighs about half as much (0.20 kg/m versus 0.37) and is for light frames, dividers, guards and small mechanisms. The GF-G Ø 43 is for uprights and cross members that have to carry a lot: over a 1000 mm span it supports 851 N at the centre versus 195 N for the GF-N, for the same deflection. It is often worth mixing them, for example GF-G uprights and GF-N cross members joined by mixed connectors.

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