Finished FRP product
Fiberglass square tube
A fiberglass square tube is a closed glass fiber reinforced polymer profile with equal nominal outside sides. Its flat faces provide drawing references for brackets and drilled connections, while its hollow interior requires separate attention to corner radii and insert clearance. FRP, GRP and glass fibre square tube refer to this same product form.
Download spec sheet & RFQ checklist (.txt)Illustrative section · not to scale
Selection notes
Do not infer the insert shape
Name each drilled face
Choose the configuration
What to resolve before selecting this product
Do not infer the insert shape
Outside side minus two walls gives a nominal flat-to-flat opening, but does not describe the internal corners. Supply the insert corner geometry and required insertion depth.
Name each drilled face
Use face labels and one length datum. A square outline can hide an incorrectly rotated hole pattern; show whether opposite holes must align and how the part will be installed.
Confirm the actual section
Catalogue limits do not guarantee every side, wall and length combination. Request the proposed drawing and tooling confirmation before treating a size as available.
Evidence and purchasing requirements
Inspect the corners as well as the sides
| Feature | What the purchase drawing should control |
|---|---|
| Equal outside sides | Label both measurements and agreed tolerances; do not accept one side measurement as the whole check. |
| Internal corners | Define radius or a mating gauge that represents the actual insert. |
| Face alignment | Specify squareness and twist requirements with an agreed inspection setup. |
| Holes and slots | Identify the face, end datum and relationship between opposing features. |
Keep the source dimensions in millimeters. A nominal metric section is not automatically interchangeable with an inch-sized sleeve. A fit sample should represent the production material, surface condition and machining revision. Dimensional approval also leaves structural performance to a separate review of the loading, connections and proposed material data.
Sources and scope
- Henan Zhongsheng square tube catalogue
Supports metric exterior, wall and length ranges; certification and performance claims are not adopted.
Specification
Configuration table
Published catalogue values are reference figures; the agreed configuration and acceptance criteria belong in the quotation. Unconfirmed values are marked TBD · ask factory.
| Parameter | Specification / requirement |
|---|---|
| Catalogue outside envelope | 25 × 25 to 100 × 100 mm |
| Catalogue wall and lengthPublished ranges, not a list of available combinations or stock. | Wall 3–6 mm; length 1,000–6,000 mm |
| Corner radii and dimensional tolerances | TBD · ask factory |
| Mechanical properties and applicable tests | TBD · ask factory |
| Minimum order and lead time | TBD · ask factory |
Reference: Henan Zhongsheng — square tube catalogue. Manufacturer catalogue reviewed 2026-10-22. Metric ranges describe published examples; confirm the exact section, material and availability in writing. Updated .
Supply workflow
From product specification to delivery
Use these stages to define responsibilities, interfaces and the evidence needed at handover.
- 01
Issue the face-labelled drawing
Provide side, wall, radii, hole references and cut-length quantities.
- 02
Confirm tooling and material
Resolve the proposed section and any departures from the enquiry.
- 03
Approve the assembled sample
Check insert clearance and bracket alignment using nominated mating parts.
- 04
Review lot inspection
Reconcile dimensions, hole pattern and labels before dispatch.
Scope of supply
Define the supply package and its options
Request an itemized quotation against these lists. A catalogue description does not confirm that every item is included.
Product and work to specify
- Square tubes to the agreed section drawing and cut-length schedule
- Order-specific packing, lot identification and agreed inspection records
Options and services to price separately
- Face drilling, slots, inserts and sample qualification
- Special tooling, project tests and freight
Applications
Applications to discuss with engineering
- Framework components subject to project design
- Bracket and railing assemblies with specified connections
Cross-sections
Product forms and catalogue examples
- Square hollow section with equal nominal exterior sides
Prepare your enquiry
Send an enquiry that can be quoted
Include the drawings and requirements below so engineering can confirm the configuration, exclusions and lead time.
Include in your RFQ
- Outside side, wall and corner requirements
- Face-labelled hole pattern with datum end
- Insert dimensions and assembly sample requirements
- Service loads, exposure and required test evidence
- Quantities by length, packaging and delivery destination
Agree the acceptance evidence
- Measure both sides and walls at nominated positions.
- Check corner clearance using the approved insert or gauge.
- Inspect squareness, twist and face-specific machining.
- Verify cut lengths, surface condition and lot records.
Commercial terms
Who you contract with
- Manufacturer
- Henan Zhongsheng Composite Material Co., Ltd.
- Warranty party and term
- Henan Zhongsheng Composite Material Co., Ltd.; term and coverage confirmed in the written quotation.
- Contracting party and exporter of record
- pultrx, Shanghai, China
- Incoterms
- FOB Chinese port by default; CIF/DAP on request
- Payment
- Agree milestones for specification approval, any required samples, batch inspection and shipment. Exact split on the quotation.
- Third-party inspection
- SGS, BV or TÜV pre-shipment inspection accepted, cost borne by the buyer
- Performance and inspection
- Specify the intended use, design loads, environment and applicable test methods. Confirm material data, dimensional tolerances and required inspection reports for the quoted product; catalogue examples do not establish project approval.
- Order quantity and lead time
- Confirm minimum order quantity, cut lengths, packing and working days from specification approval. Availability is established in the quotation.
FAQ
Questions buyers ask
- Are all catalogue size combinations available?
- No availability is established by these ranges. Obtain an offer identifying the complete section, quantity and production lead time.
- Does the square shape establish a load capacity?
- No. A load assessment needs the material properties, span, supports and connections for the particular assembly. Same-size steel performance cannot be transferred to fiberglass.
Send a cross-section drawing. Get a scoped quotation.
Every quotation names the manufacturer, the exporter of record and the warranty party, and lists what is included.