Name: Aluminium strut profile 45x90
Brand: Bosch Rexroth
SKU: 3842990300

AL Modular System · C10 profiles

Aluminium strut profile 45x90 – profile with slot 10 for crossbars and support frames

The 45x90 is like two 45x45 in a single profile: six 10 mm slots, central bores that can be threaded and the heavy slot of the 45 series. Mounted upright it has Ix = 124.6 cm⁴, nine times the 45x45: it is the profile for long or loaded crossbars, bases, machine frames and heavy trolleys. Order it as a 6070 mm bar or cut to length.

Section 45 × 90 mm6 slots of 10 mm4.2 kg/mIx 124.6 cm⁴Heavy slot

124,6 cm⁴Ix, mounted upright

32,8 cm⁴Iy, flat

4,2 kg/mweight

6070 mmbar, usable length

Why choose it

Stiff when upright

Mounted upright it deflects almost four times less than flat: long crossbars without intermediate supports.

Heavy slot

Slot geometry for high-strength connections, even under dynamic loads.

Machinable central bores

Can be threaded M12 or M16 for feet, central bolts and end connections.

Bar or cut to size

6070 mm bar of usable length or pieces cut to your dimensions, from 50 mm upwards.

Choose it if…

You have long or loaded crossbars and want to avoid intermediate supports.
You build bases, machine frames or heavy trolleys.
You want two rows of slots on the same side to fix guides or panels.
You work in the 45 series and want the same accessories as the 45x45.

Choose another solution if…

Loads are medium and you want less weight, 3.0 kg/m: Aluminium strut profile 45x90L →
Spans are even longer: the 45x180 has Ix 766.7 cm⁴: Aluminium strut profile 45x180 →
You need a post that is stiff in both directions: Aluminium strut profile 90x90L →

Not sure which profile to choose? Open the guide with the profile table →

How to use it in the structure

Three practical tips for the 45x90:

Orientation

Upright Ix 124.6 cm⁴, flat Iy 32.8 cm⁴: the same crossbar deflects almost four times less if you mount it upright.

Span and deflection

Over 1000 mm, supports at the ends and 500 N at the centre: about 0.12 mm upright and 0.45 mm flat.

Machining

M12 or M16 in all central bores and D17 holes for connectors; the machined profile goes up to 6000 mm.

For loads in several directions or very heavily loaded posts consider the 90x90L.

The LeanProducts service

Original components and a single point of contact, from drawing to kit:

Cutting to length

We cut the profiles in our workshop to the lengths in your parts list.

Parts list check

We start from the parts list or sketch: we check codes, quantities and connection accessories.

Ready-to-assemble kits

You receive cut profiles, brackets, nuts and cover caps grouped for your structure.

Spare parts

When you modify or extend the structure we supply profiles and components from the same system.

Send us a sketch with the overall dimensions: we reply with codes, accessories and cut lengths.

Technical data

Property	Value
Code	3842990300
Section	45 × 90 mm
Slot	10 mm (C10)
Cross-sectional area	A = 15.4 cm²
Weight	4.2 kg/m
Moment of inertia	Ix 124.6 cm⁴ · Iy 32.8 cm⁴
Section modulus	Wx 27.7 cm³ · Wy 14.6 cm³
Torsion	It 15.40 cm⁴ · Wt 6.61 cm³
Bar length	6070 mm (usable length) or cut to length
Minimum cut length	50 mm
Alloy and finish	EN AW-6063 (AlMgSi), extruded, anodised E6/EV1 12 µm (300 HV)
Mechanical properties	Rm 245 N/mm² · Rp0.2 195 N/mm² · E 70 000 N/mm² · 75 HB
Tolerances	Straightness max 0.75 mm/m · torsion max 0.70 mm/m
Cover cap	Cover cap for profile 45x90 in PP, grey or black ESD
Series	45 series (45 mm modular dimension)
Slot geometry	Heavy, for high-strength connections
Standard machining	M12 or M16 thread in the central bores, D9.8 and D17 holes for connectors; profile machined up to 6000 mm
Packaging	Single bar or pack of 12 bars

The bar has the stated usable length: the physical piece is about 100 mm longer, because the anodising contact points remain at the ends.

Downloads

MGE catalogue pages 15 Download PDF

Any other questions?Read the 17 FAQs →

Need help with your profile parts list?

Send us a sketch or the parts list: we will give you codes, accessories and cut lengths.

Request a quote Call +39 0434 572757

Specifications

Brand	Bosch Rexroth
Section mm	45x90
Slot mm	10
Cross-section area cm²	15.4
Moment of inertia Ix / Iy cm⁴	124.6 / 32.8
Section modulus Wx / Wy cm³	27.7 / 14.6
Max length mm	6070
Alloy	EN AW-6063 (Al MgSi)
Production method	Extrusion
Surface treatment	Anodising E6/EV1, 12 µm, 300 HV
Coefficient of thermal expansion	23.4 × 10⁻⁶ 1/K (+20…100 °C)
Tensile strength	245 N/mm²
Yield strength	195 N/mm²
Elongation at break	10%
Modulus of elasticity E	70000 N/mm²
Brinell hardness	75 HB
Straightness tolerance	max 0.75 mm/m
Torsion tolerance	max 0.70 mm/m
Torsion factor It cm⁴	15.40
Torsion factor Wt cm³	6.61
Min length mm	50
Length	6070
Weight	4.2 kg/m
Material	Anodized aluminium

When the 45x45 deflects too much but the 45x90 is larger than necessary: the 45x60 has Ix 37.2 cm⁴ and weighs 3.0 kg/m, compared with 13.8 and 2.0 for the 45x45 and 124.6 and 4.2 for the 45x90.

It depends on where the load comes from. Upright, with the 90 mm side vertical, it has Ix 124.6 cm⁴; flat Iy 32.8 cm⁴. For a crossbar loaded from above mount it upright: it deflects almost four times less.

The 45x90L weighs 3.0 kg/m and has Ix 82.0 / Iy 23.6 cm⁴; the solid 45x90 weighs 4.2 kg/m, has 124.6 / 32.8 cm⁴ and the heavy slot. Same cover cap and same brackets: for normal loads the 45x90L is enough.

The 50x100L has Ix 162.8 cm⁴ at 4.6 kg/m; the solid 45x90 has 124.6 cm⁴ at 4.2 kg/m. The choice is driven mainly by the series: stay in the same grid dimension as the rest of the structure.

The 45x90 weighs 4.2 kg/m, has Ix 124.6 and Iy 32.8 cm⁴ and heavy-geometry slots. The 45x90L weighs 3.0 kg/m and has 82.0 and 23.6 cm⁴. They have the same dimensions and use the same cover cap and the same 45x90 brackets.

An example: 1000 mm span, supports at the ends and 500 N at the centre. Upright the theoretical deflection is about 0.12 mm, flat about 0.45 mm (E = 70 000 N/mm²). Joints and constraints change the result: we carry out the verification on the drawing.

Yes, M12 or M16 in all central bores, as standard machining with its own code. Minimum lengths: 60 mm with M12 on one end and 110 mm on both; 120 mm with M16 on one end and 240 mm on both.

The zinc-plated steel foot in the 45x90 version for 10 mm slot, or an levelling foot screwed into the threaded central bore.

The screw alone on profiles with slot C10 and an M12-threaded central hole. The plate version on the 40x80, 45x90, 80x80 and 90x90 sections.

It is the width of the profile slot and determines which accessories you use. Slot C6 (6 mm) is for 20 series profiles, C8 (8 mm) for the 30 series, C10 (10 mm) for profiles from the 40 series upwards. Nuts, screws, brackets and cover caps are chosen by slot: each accessory's product page shows the right one.

Yes. You can order the full bar or the piece cut to the length you need: we do the cutting ourselves, in our workshop. Each profile's product page shows the maximum bar length and the minimum cut length.

Look at the moments of inertia Ix and Iy: the higher they are, the less the profile deflects under load. For the same section, “L” profiles are lightened and deflect a little more. For long spans or high loads move to a larger section or a tall profile (e.g. 45x90 instead of 45x45). If you send us drawing and loads, we will check the choice.

The T-nut is inserted from the front into the slot, even in an assembled structure, and positions itself when you tighten the screw: it is the standard choice for fixing accessories. The sliding block withstands higher forces, but normally has to be inserted from the profile end before closing the frame; spring versions stay where you put them.

The simplest way is the bracket, which joins two profiles at 90° with screws and nuts in the slot, without machining. For end, T, 45° or three-way connections there are dedicated connectors, some of which require profile machining as stated on their product page.

Yes, for several accessories (for example cover caps, hinges and nuts) there are conductive ESD versions, indicated in the name or variant. Tell us which EPA area you work in and we will confirm the components to use.

On each product page you will find the MGE catalogue pages to download as PDF, with dimensioned drawings and technical data; the Specifications tab shows the data for the variant you have chosen.

Yes. Send us the parts list or a sketch with dimensions: we give you codes, quantities and cut lengths and prepare the kit with profiles already cut and the accessories.