Fiberglass square tube 120×120×8 mm
Dimensions, section properties computed from the geometry, allowable loads by span and EN 13706 E23 mechanical data for the SHS 120×120×8 pultruded profile.
- Model
- SHS 120×120×8
- EN 13706 grade
- E23
- Published mass
- 5.6 kg/m
- Section area
- 3584 mm²
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Cross-section and section properties
≈ 4.724 × 4.724 × 0.315 in, for reference only; the metric dimensions govern.
| Side (D) | 120 mm |
|---|---|
| Wall thickness (t) | 8 mm |
| Mass per meter (published) | 5.6 kg/m |
| Section property (calculated) | Value |
|---|---|
| Cross-section area A | 3584 mm² |
| Moment of inertia Ix | 753.1 cm⁴ |
| Moment of inertia Iy | 753.1 cm⁴ |
| Section modulus Sx | 125.5 cm³ |
| Section modulus Sy | 125.5 cm³ |
| Radius of gyration rx | 45.84 mm |
| Radius of gyration ry | 45.84 mm |
| Torsion constant J | 1124 cm⁴ |
| Mass per meter (calculated) | 6.81 kg/m |
Derived from the cross-section geometry by polygon integration. The published mass per meter is the catalog value; the calculated figure is a geometric cross-check. Because the modulus of FRP is about a tenth of steel's, deflection usually governs, so check spans in the profile calculator. For a planning budget per meter, enter these dimensions in the price estimator.
A dimensioned cross-section in DXF, free and without a login. It opens in AutoCAD, DraftSight, LibreCAD and other CAD packages.
What a 120×120×8 mm fiberglass square tube carries
| Span (m) | Allowable UDL (kN/m) | ≈ lb/ft | Governing check |
|---|---|---|---|
| 1 | 23.0 | 1575 | shear |
| 1.5 | 14.0 | 959 | deflection |
| 2 | 6.2 | 425 | deflection |
| 2.5 | 3.3 | 223 | deflection |
| 3 | 1.9 | 131 | deflection |
| 4 | 0.82 | 56.0 | deflection |
| 5 | 0.42 | 28.8 | deflection |
| 6 | 0.24 | 16.7 | deflection |
Spans where the allowable load falls below 0.05 kN/m are omitted. Point loads, connections, lateral restraint and other exposures need their own check: open this section in the calculator or compare every size in the span tables.
Mechanical and physical properties
Internal catalog reference: profile:shs-120x120x8 (website reference, not a manufacturer SKU). Material dataset: E23-ISO. Revision: catalog-05fc2fc34578.
Confirm the section and material together with engineering. The design manual is a general reference; no public test report is mapped to this exact configuration. Supply and performance require confirmation. Published catalog mass for the default dataset; confirm finished-product mass.
The methods below identify measurement standards, not proof that this section was tested. Confirm manufacturing, required performance and the applicable report before specification.
Check evidence for this configuration| Property | Value | Test method |
|---|---|---|
| Tensile modulus (longitudinal) | 23 GPa | EN ISO 527-4 |
| Tensile modulus (transverse) | 7 GPa | EN ISO 527-4 |
| Tensile strength (longitudinal) | 240 MPa | EN ISO 527-4 |
| Tensile strength (transverse) | 50 MPa | EN ISO 527-4 |
| Flexural strength (longitudinal) | 240 MPa | EN ISO 14125 |
| Flexural strength (transverse) | 100 MPa | EN ISO 14125 |
| Interlaminar shear strength (ILSS) | 30 MPa | EN ISO 14130 |
| Pin-bearing strength (longitudinal) | 150 MPa | EN 13706-2 Annex E |
| Pin-bearing strength (transverse) | 70 MPa | EN 13706-2 Annex E |
| Compressive strength (longitudinal) | 240 MPa | EN ISO 604 |
| Barcol hardness | 45 | ASTM D2583 |
| Water absorption (24 h) | 0.6 % | EN ISO 62 |
- Resin:
- Isophthalic unsaturated polyester
- Glass content:
- 65–70% by weight
- Density:
- 1.9 g/cm³
- Grade:
- E23
- Fire:
- Standard grade — not fire-retardant (specify an FR grade for ASTM E84 Class 1)
Data basis: F1-published general-purpose laminate (FRP Profile Design Manual DOC-PF-2026-EN Rev. B); ILSS 30 MPa published above the EN 13706 minimum of 25 MPa; transverse values are EN 13706-3 Table 1 grade minimums. Standard isophthalic polyester is not fire-retardant — for ASTM E84 Class 1 specify the FR-E23 grade. Compressive strength, Barcol hardness and water absorption are not specified by EN 13706 — the figures shown are typical industry values for this resin system, pending F1 certified test data; request certified values before final design.
Standards: EN 13706 Grade E23.
Values marked “Verify before release” are pending certified test data and are never estimated. Request batch-traceable certified data through the quote form before final design.
Other square and rectangular tubes in the catalog 20 sizes
- SHS 25×25×3.2 · 0.4 kg/m
- SHS 38×38×4.8 · 0.9 kg/m
- RHS 40×20×7 · 1 kg/m
- RHS 40×25×8 · 1.2 kg/m
- SHS 50×50×5 · 1.4 kg/m
- SHS 60×60×5 · 1.7 kg/m
- SHS 75×75×6 · 2.5 kg/m
- RHS 80×60×5 · 2 kg/m
- SHS 100×100×6 · 3.5 kg/m
- SHS 100×100×8 · 4.5 kg/m
- RHS 100×60×8 · 3.6 kg/m
- SHS 114×114×6 · 4 kg/m
- SHS 114×114×8 · 5.2 kg/m
- SHS 120×120×8 · 5.6 kg/m
- RHS 120×60×5 · 2.6 kg/m
- SHS 132×132×9.5 · 7 kg/m
- SHS 152×152×9.5 · 8.2 kg/m
- SHS 160×160×8 · 7.4 kg/m
- SHS 200×200×10 · 11.6 kg/m
- SHS 240×240×12 · 16.8 kg/m
Applications, resin options and quotation details are on the fiberglass square tube product page.
SHS 120×120×8: common questions
How much does a fiberglass square tube 120×120×8 mm weigh?
The published mass is 5.6 kg per meter (about 3.76 lb/ft), so a standard 6 m length weighs about 33.6 kg.
What load can a 120×120×8 mm fiberglass square tube carry?
On the published design basis (EN 13706 E23, LRFD to ASCE/SEI 74-23, outdoor exposure, L/250 deflection with shear deformation), the allowable service uniform load is about 23.0 kN/m over a simply supported 1 m span and 1.9 kN/m over 3 m (deflection governs at 3 m). Check point loads, connections and your own exposure in the calculator before release.
Is there a CAD drawing for SHS 120×120×8?
Yes. A dimensioned DXF cross-section is a free download on this page, with no login. It opens in AutoCAD, DraftSight, LibreCAD and other CAD packages.
What is the lead time for SHS 120×120×8?
SHS 120×120×8 is a catalog section in 6 m standard lengths. Catalog sections ship in 2–4 weeks. Catalog dimensions identify standard section options, not live inventory. Confirm tooling, material, quantity and production timing in the quotation.
Need a quote for SHS 120×120×8?
Send the dimensions, quantity, service conditions and destination. We reply within one business day.